nuklear.h

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/*
 Nuklear - 2.00.0 - public domain
 no warranty implied; use at your own risk.
 authored from 2015-2017 by Micha Mettke

ABOUT:
    This is a minimal state graphical user interface single header toolkit
    written in ANSI C and licensed under public domain.
    It was designed as a simple embeddable user interface for application and does
    not have any dependencies, a default renderbackend or OS window and input handling
    but instead provides a very modular library approach by using simple input state
    for input and draw commands describing primitive shapes as output.
    So instead of providing a layered library that tries to abstract over a number
    of platform and render backends it only focuses on the actual UI.

VALUES:
    - Graphical user interface toolkit
    - Single header library
    - Written in C89 (a.k.a. ANSI C or ISO C90)
    - Small codebase (~18kLOC)
    - Focus on portability, efficiency and simplicity
    - No dependencies (not even the standard library if not wanted)
    - Fully skinnable and customizable
    - Low memory footprint with total memory control if needed or wanted
    - UTF-8 support
    - No global or hidden state
    - Customizable library modules (you can compile and use only what you need)
    - Optional font baker and vertex buffer output

USAGE:
    This library is self contained in one single header file and can be used either
    in header only mode or in implementation mode. The header only mode is used
    by default when included and allows including this header in other headers
    and does not contain the actual implementation.

    The implementation mode requires to define  the preprocessor macro
    NK_IMPLEMENTATION in *one* .c/.cpp file before #includeing this file, e.g.:

        #define NK_IMPLEMENTATION
        #include "nuklear.h"

    Also optionally define the symbols listed in the section "OPTIONAL DEFINES"
    below in header and implementation mode if you want to use additional functionality
    or need more control over the library.
    IMPORTANT:  Every time you include "nuklear.h" you have to define the same flags.
                This is very important not doing it either leads to compiler errors
                or even worse stack corruptions.

FEATURES:
    - Absolutely no platform dependent code
    - Memory management control ranging from/to
        - Ease of use by allocating everything from standard library
        - Control every byte of memory inside the library
    - Font handling control ranging from/to
        - Use your own font implementation for everything
        - Use this libraries internal font baking and handling API
    - Drawing output control ranging from/to
        - Simple shapes for more high level APIs which already have drawing capabilities
        - Hardware accessible anti-aliased vertex buffer output
    - Customizable colors and properties ranging from/to
        - Simple changes to color by filling a simple color table
        - Complete control with ability to use skinning to decorate widgets
    - Bendable UI library with widget ranging from/to
        - Basic widgets like buttons, checkboxes, slider, ...
        - Advanced widget like abstract comboboxes, contextual menus,...
    - Compile time configuration to only compile what you need
        - Subset which can be used if you do not want to link or use the standard library
    - Can be easily modified to only update on user input instead of frame updates

OPTIONAL DEFINES:
    NK_PRIVATE
        If defined declares all functions as static, so they can only be accessed
        inside the file that contains the implementation

    NK_INCLUDE_FIXED_TYPES
        If defined it will include header <stdint.h> for fixed sized types
        otherwise nuklear tries to select the correct type. If that fails it will
        throw a compiler error and you have to select the correct types yourself.
        <!> If used needs to be defined for implementation and header <!>

    NK_INCLUDE_DEFAULT_ALLOCATOR
        if defined it will include header <stdlib.h> and provide additional functions
        to use this library without caring for memory allocation control and therefore
        ease memory management.
        <!> Adds the standard library with malloc and free so don't define if you
            don't want to link to the standard library <!>
        <!> If used needs to be defined for implementation and header <!>

    NK_INCLUDE_STANDARD_IO
        if defined it will include header <stdio.h> and provide
        additional functions depending on file loading.
        <!> Adds the standard library with fopen, fclose,... so don't define this
            if you don't want to link to the standard library <!>
        <!> If used needs to be defined for implementation and header <!>

    NK_INCLUDE_STANDARD_VARARGS
        if defined it will include header <stdarg.h> and provide
        additional functions depending on variable arguments
        <!> Adds the standard library with va_list and  so don't define this if
            you don't want to link to the standard library<!>
        <!> If used needs to be defined for implementation and header <!>

    NK_INCLUDE_VERTEX_BUFFER_OUTPUT
        Defining this adds a vertex draw command list backend to this
        library, which allows you to convert queue commands into vertex draw commands.
        This is mainly if you need a hardware accessible format for OpenGL, DirectX,
        Vulkan, Metal,...
        <!> If used needs to be defined for implementation and header <!>

    NK_INCLUDE_FONT_BAKING
        Defining this adds `stb_truetype` and `stb_rect_pack` implementation
        to this library and provides font baking and rendering.
        If you already have font handling or do not want to use this font handler
        you don't have to define it.
        <!> If used needs to be defined for implementation and header <!>

    NK_INCLUDE_DEFAULT_FONT
        Defining this adds the default font: ProggyClean.ttf into this library
        which can be loaded into a font atlas and allows using this library without
        having a truetype font
        <!> Enabling this adds ~12kb to global stack memory <!>
        <!> If used needs to be defined for implementation and header <!>

    NK_INCLUDE_COMMAND_USERDATA
        Defining this adds a userdata pointer into each command. Can be useful for
        example if you want to provide custom shaders depending on the used widget.
        Can be combined with the style structures.
        <!> If used needs to be defined for implementation and header <!>

    NK_BUTTON_TRIGGER_ON_RELEASE
        Different platforms require button clicks occurring either on buttons being
        pressed (up to down) or released (down to up).
        By default this library will react on buttons being pressed, but if you
        define this it will only trigger if a button is released.
        <!> If used it is only required to be defined for the implementation part <!>

    NK_ZERO_COMMAND_MEMORY
        Defining this will zero out memory for each drawing command added to a
        drawing queue (inside nk_command_buffer_push). Zeroing command memory
        is very useful for fast checking (using memcmp) if command buffers are
        equal and avoid drawing frames when nothing on screen has changed since
        previous frame.

    NK_ASSERT
        If you don't define this, nuklear will use <assert.h> with assert().
        <!> Adds the standard library so define to nothing of not wanted <!>
        <!> If used needs to be defined for implementation and header <!>

    NK_BUFFER_DEFAULT_INITIAL_SIZE
        Initial buffer size allocated by all buffers while using the default allocator
        functions included by defining NK_INCLUDE_DEFAULT_ALLOCATOR. If you don't
        want to allocate the default 4k memory then redefine it.
        <!> If used needs to be defined for implementation and header <!>

    NK_MAX_NUMBER_BUFFER
        Maximum buffer size for the conversion buffer between float and string
        Under normal circumstances this should be more than sufficient.
        <!> If used needs to be defined for implementation and header <!>

    NK_INPUT_MAX
        Defines the max number of bytes which can be added as text input in one frame.
        Under normal circumstances this should be more than sufficient.
        <!> If used it is only required to be defined for the implementation part <!>

    NK_MEMSET
        You can define this to 'memset' or your own memset implementation
        replacement. If not nuklear will use its own version.
        <!> If used it is only required to be defined for the implementation part <!>

    NK_MEMCPY
        You can define this to 'memcpy' or your own memcpy implementation
        replacement. If not nuklear will use its own version.
        <!> If used it is only required to be defined for the implementation part <!>

    NK_SQRT
        You can define this to 'sqrt' or your own sqrt implementation
        replacement. If not nuklear will use its own slow and not highly
        accurate version.
        <!> If used it is only required to be defined for the implementation part <!>

    NK_SIN
        You can define this to 'sinf' or your own sine implementation
        replacement. If not nuklear will use its own approximation implementation.
        <!> If used it is only required to be defined for the implementation part <!>

    NK_COS
        You can define this to 'cosf' or your own cosine implementation
        replacement. If not nuklear will use its own approximation implementation.
        <!> If used it is only required to be defined for the implementation part <!>

    NK_STRTOD
        You can define this to `strtod` or your own string to double conversion
        implementation replacement. If not defined nuklear will use its own
        imprecise and possibly unsafe version (does not handle nan or infinity!).
        <!> If used it is only required to be defined for the implementation part <!>

    NK_DTOA
        You can define this to `dtoa` or your own double to string conversion
        implementation replacement. If not defined nuklear will use its own
        imprecise and possibly unsafe version (does not handle nan or infinity!).
        <!> If used it is only required to be defined for the implementation part <!>

    NK_VSNPRINTF
        If you define `NK_INCLUDE_STANDARD_VARARGS` as well as `NK_INCLUDE_STANDARD_IO`
        and want to be safe define this to `vsnprintf` on compilers supporting
        later versions of C or C++. By default nuklear will check for your stdlib version
        in C as well as compiler version in C++. if `vsnprintf` is available
        it will define it to `vsnprintf` directly. If not defined and if you have
        older versions of C or C++ it will be defined to `vsprintf` which is unsafe.
        <!> If used it is only required to be defined for the implementation part <!>

    NK_BYTE
    NK_INT16
    NK_UINT16
    NK_INT32
    NK_UINT32
    NK_SIZE_TYPE
    NK_POINTER_TYPE
        If you compile without NK_USE_FIXED_TYPE then a number of standard types
        will be selected and compile time validated. If they are incorrect you can
        define the correct types by overloading these type defines.

CREDITS:
    Developed by Micha Mettke and every direct or indirect contributor.

    Embeds stb_texedit, stb_truetype and stb_rectpack by Sean Barret (public domain)
    Embeds ProggyClean.ttf font by Tristan Grimmer (MIT license).

    Big thank you to Omar Cornut (ocornut@github) for his imgui library and
    giving me the inspiration for this library, Casey Muratori for handmade hero
    and his original immediate mode graphical user interface idea and Sean
    Barret for his amazing single header libraries which restored my faith
    in libraries and brought me to create some of my own.

LICENSE:
    This software is dual-licensed to the public domain and under the following
    license: you are granted a perpetual, irrevocable license to copy, modify,
    publish and distribute this file as you see fit.
*/
#ifndef NK_NUKLEAR_H_
#define NK_NUKLEAR_H_

#ifdef __cplusplus
extern "C" {
#endif
/*
 * ==============================================================
 *
 *                          CONSTANTS
 *
 * ===============================================================
 */
#define NK_UNDEFINED (-1.0f)
#define NK_UTF_INVALID 0xFFFD /* internal invalid utf8 rune */
#define NK_UTF_SIZE 4 /* describes the number of bytes a glyph consists of*/
#ifndef NK_INPUT_MAX
#define NK_INPUT_MAX 16
#endif
#ifndef NK_MAX_NUMBER_BUFFER
#define NK_MAX_NUMBER_BUFFER 64
#endif
#ifndef NK_SCROLLBAR_HIDING_TIMEOUT
#define NK_SCROLLBAR_HIDING_TIMEOUT 4.0f
#endif
/*
 * ==============================================================
 *
 *                          HELPER
 *
 * ===============================================================
 */
#ifndef NK_API
  #ifdef NK_PRIVATE
    #if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199409L))
      #define NK_API static inline
    #elif defined(__cplusplus)
      #define NK_API static inline
    #else
      #define NK_API static
    #endif
  #else
    #define NK_API extern
  #endif
#endif

#define NK_INTERN static
#define NK_STORAGE static
#define NK_GLOBAL static

#define NK_FLAG(x) (1 << (x))
#define NK_STRINGIFY(x) #x
#define NK_MACRO_STRINGIFY(x) NK_STRINGIFY(x)
#define NK_STRING_JOIN_IMMEDIATE(arg1, arg2) arg1 ## arg2
#define NK_STRING_JOIN_DELAY(arg1, arg2) NK_STRING_JOIN_IMMEDIATE(arg1, arg2)
#define NK_STRING_JOIN(arg1, arg2) NK_STRING_JOIN_DELAY(arg1, arg2)

#ifdef _MSC_VER
#define NK_UNIQUE_NAME(name) NK_STRING_JOIN(name,__COUNTER__)
#else
#define NK_UNIQUE_NAME(name) NK_STRING_JOIN(name,__LINE__)
#endif

#ifndef NK_STATIC_ASSERT
#define NK_STATIC_ASSERT(exp) typedef char NK_UNIQUE_NAME(_dummy_array)[(exp)?1:-1]
#endif

#ifndef NK_FILE_LINE
#ifdef _MSC_VER
#define NK_FILE_LINE __FILE__ ":" NK_MACRO_STRINGIFY(__COUNTER__)
#else
#define NK_FILE_LINE __FILE__ ":" NK_MACRO_STRINGIFY(__LINE__)
#endif
#endif

#define NK_MIN(a,b) ((a) < (b) ? (a) : (b))
#define NK_MAX(a,b) ((a) < (b) ? (b) : (a))
#define NK_CLAMP(i,v,x) (NK_MAX(NK_MIN(v,x), i))
/*
 * ===============================================================
 *
 *                          BASIC
 *
 * ===============================================================
 */
#ifdef NK_INCLUDE_FIXED_TYPES
 #include <stdint.h>
 #define NK_INT8 int8_t
 #define NK_UINT8 uint8_t
 #define NK_INT16 int16_t
 #define NK_UINT16 uint16_t
 #define NK_INT32 int32_t
 #define NK_UINT32 uint32_t
 #define NK_SIZE_TYPE uintptr_t
 #define NK_POINTER_TYPE uintptr_t
#else
  #ifndef NK_INT8
    #define NK_INT8 char
  #endif
  #ifndef NK_UINT8
    #define NK_UINT8 unsigned char
  #endif
  #ifndef NK_INT16
    #define NK_INT16 signed short
  #endif
  #ifndef NK_UINT16
    #define NK_UINT16 unsigned short
  #endif
  #ifndef NK_INT32
    #if defined(_MSC_VER)
      #define NK_INT32 __int32
    #else
      #define NK_INT32 signed int
    #endif
  #endif
  #ifndef NK_UINT32
    #if defined(_MSC_VER)
      #define NK_UINT32 unsigned __int32
    #else
      #define NK_UINT32 unsigned int
    #endif
  #endif
  #ifndef NK_SIZE_TYPE
    #if defined(_WIN64) && defined(_MSC_VER)
      #define NK_SIZE_TYPE unsigned __int64
    #elif (defined(_WIN32) || defined(WIN32)) && defined(_MSC_VER)
      #define NK_SIZE_TYPE unsigned __int32
    #elif defined(__GNUC__) || defined(__clang__)
      #if defined(__x86_64__) || defined(__ppc64__)
        #define NK_SIZE_TYPE unsigned long
      #else
        #define NK_SIZE_TYPE unsigned int
      #endif
    #else
      #define NK_SIZE_TYPE unsigned long
    #endif
  #endif
  #ifndef NK_POINTER_TYPE
    #if defined(_WIN64) && defined(_MSC_VER)
      #define NK_POINTER_TYPE unsigned __int64
    #elif (defined(_WIN32) || defined(WIN32)) && defined(_MSC_VER)
      #define NK_POINTER_TYPE unsigned __int32
    #elif defined(__GNUC__) || defined(__clang__)
      #if defined(__x86_64__) || defined(__ppc64__)
        #define NK_POINTER_TYPE unsigned long
      #else
        #define NK_POINTER_TYPE unsigned int
      #endif
    #else
      #define NK_POINTER_TYPE unsigned long
    #endif
  #endif
#endif

typedef NK_INT8 nk_char;
typedef NK_UINT8 nk_uchar;
typedef NK_UINT8 nk_byte;
typedef NK_INT16 nk_short;
typedef NK_UINT16 nk_ushort;
typedef NK_INT32 nk_int;
typedef NK_UINT32 nk_uint;
typedef NK_SIZE_TYPE nk_size;
typedef NK_POINTER_TYPE nk_ptr;

typedef nk_uint nk_hash;
typedef nk_uint nk_flags;
typedef nk_uint nk_rune;

/* Make sure correct type size:
 * This will fire with a negative subscript error if the type sizes
 * are set incorrectly by the compiler, and compile out if not */
NK_STATIC_ASSERT(sizeof(nk_short) == 2);
NK_STATIC_ASSERT(sizeof(nk_ushort) == 2);
NK_STATIC_ASSERT(sizeof(nk_uint) == 4);
NK_STATIC_ASSERT(sizeof(nk_int) == 4);
NK_STATIC_ASSERT(sizeof(nk_byte) == 1);
NK_STATIC_ASSERT(sizeof(nk_flags) >= 4);
NK_STATIC_ASSERT(sizeof(nk_rune) >= 4);
NK_STATIC_ASSERT(sizeof(nk_size) >= sizeof(void*));
NK_STATIC_ASSERT(sizeof(nk_ptr) >= sizeof(void*));

/* ============================================================================
 *
 *                                  API
 *
 * =========================================================================== */
struct nk_buffer;
struct nk_allocator;
struct nk_command_buffer;
struct nk_draw_command;
struct nk_convert_config;
struct nk_style_item;
struct nk_text_edit;
struct nk_draw_list;
struct nk_user_font;
struct nk_panel;
struct nk_context;
struct nk_draw_vertex_layout_element;
struct nk_style_button;
struct nk_style_toggle;
struct nk_style_selectable;
struct nk_style_slide;
struct nk_style_progress;
struct nk_style_scrollbar;
struct nk_style_edit;
struct nk_style_property;
struct nk_style_chart;
struct nk_style_combo;
struct nk_style_tab;
struct nk_style_window_header;
struct nk_style_window;

enum {nk_false, nk_true};
struct nk_color {nk_byte r,g,b,a;};
struct nk_colorf {float r,g,b,a;};
struct nk_vec2 {float x,y;};
struct nk_vec2i {short x, y;};
struct nk_rect {float x,y,w,h;};
struct nk_recti {short x,y,w,h;};
typedef char nk_glyph[NK_UTF_SIZE];
typedef union {void *ptr; int id;} nk_handle;
struct nk_image {nk_handle handle;unsigned short w,h;unsigned short region[4];};
struct nk_cursor {struct nk_image img; struct nk_vec2 size, offset;};
struct nk_scroll {nk_uint x, y;};

enum nk_heading         {NK_UP, NK_RIGHT, NK_DOWN, NK_LEFT};
enum nk_button_behavior {NK_BUTTON_DEFAULT, NK_BUTTON_REPEATER};
enum nk_modify          {NK_FIXED = nk_false, NK_MODIFIABLE = nk_true};
enum nk_orientation     {NK_VERTICAL, NK_HORIZONTAL};
enum nk_collapse_states {NK_MINIMIZED = nk_false, NK_MAXIMIZED = nk_true};
enum nk_show_states     {NK_HIDDEN = nk_false, NK_SHOWN = nk_true};
enum nk_chart_type      {NK_CHART_LINES, NK_CHART_COLUMN, NK_CHART_MAX};
enum nk_chart_event     {NK_CHART_HOVERING = 0x01, NK_CHART_CLICKED = 0x02};
enum nk_color_format    {NK_RGB, NK_RGBA};
enum nk_popup_type      {NK_POPUP_STATIC, NK_POPUP_DYNAMIC};
enum nk_layout_format   {NK_DYNAMIC, NK_STATIC};
enum nk_tree_type       {NK_TREE_NODE, NK_TREE_TAB};

typedef void*(*nk_plugin_alloc)(nk_handle, void *old, nk_size);
typedef void (*nk_plugin_free)(nk_handle, void *old);
typedef int(*nk_plugin_filter)(const struct nk_text_edit*, nk_rune unicode);
typedef void(*nk_plugin_paste)(nk_handle, struct nk_text_edit*);
typedef void(*nk_plugin_copy)(nk_handle, const char*, int len);

struct nk_allocator {
    nk_handle userdata;
    nk_plugin_alloc alloc;
    nk_plugin_free free;
};
enum nk_symbol_type {
    NK_SYMBOL_NONE,
    NK_SYMBOL_X,
    NK_SYMBOL_UNDERSCORE,
    NK_SYMBOL_CIRCLE_SOLID,
    NK_SYMBOL_CIRCLE_OUTLINE,
    NK_SYMBOL_RECT_SOLID,
    NK_SYMBOL_RECT_OUTLINE,
    NK_SYMBOL_TRIANGLE_UP,
    NK_SYMBOL_TRIANGLE_DOWN,
    NK_SYMBOL_TRIANGLE_LEFT,
    NK_SYMBOL_TRIANGLE_RIGHT,
    NK_SYMBOL_PLUS,
    NK_SYMBOL_MINUS,
    NK_SYMBOL_MAX
};
/* =============================================================================
 *
 *                                  CONTEXT
 *
 * =============================================================================*/
/*  Contexts are the main entry point and the majestro of nuklear and contain all required state.
 *  They are used for window, memory, input, style, stack, commands and time management and need
 *  to be passed into all nuklear GUI specific functions.
 *
 *  Usage
 *  -------------------
 *  To use a context it first has to be initialized which can be achieved by calling
 *  one of either `nk_init_default`, `nk_init_fixed`, `nk_init`, `nk_init_custom`.
 *  Each takes in a font handle and a specific way of handling memory. Memory control
 *  hereby ranges from standard library to just specifying a fixed sized block of memory
 *  which nuklear has to manage itself from.
 *
 *      struct nk_context ctx;
 *      nk_init_xxx(&ctx, ...);
 *      while (1) {
 *          [...]
 *          nk_clear(&ctx);
 *      }
 *      nk_free(&ctx);
 *
 *  Reference
 *  -------------------
 *  nk_init_default     - Initializes context with standard library memory allocation (malloc,free)
 *  nk_init_fixed       - Initializes context from single fixed size memory block
 *  nk_init             - Initializes context with memory allocator callbacks for alloc and free
 *  nk_init_custom      - Initializes context from two buffers. One for draw commands the other for window/panel/table allocations
 *  nk_clear            - Called at the end of the frame to reset and prepare the context for the next frame
 *  nk_free             - Shutdown and free all memory allocated inside the context
 *  nk_set_user_data    - Utility function to pass user data to draw command
 */
#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
/*  nk_init_default - Initializes a `nk_context` struct with a default standard library allocator.
 *  Should be used if you don't want to be bothered with memory management in nuklear.
 *  Parameters:
 *      @ctx must point to an either stack or heap allocated `nk_context` struct
 *      @font must point to a previously initialized font handle for more info look at font documentation
 *  Return values:
 *      true(1) on success
 *      false(0) on failure */
NK_API int nk_init_default(struct nk_context*, const struct nk_user_font*);
#endif
/*  nk_init_fixed - Initializes a `nk_context` struct from a single fixed size memory block
 *  Should be used if you want complete control over nuklear's memory management.
 *  Especially recommended for system with little memory or systems with virtual memory.
 *  For the later case you can just allocate for example 16MB of virtual memory
 *  and only the required amount of memory will actually be committed.
 *  IMPORTANT: make sure the passed memory block is aligned correctly for `nk_draw_commands`
 *  Parameters:
 *      @ctx must point to an either stack or heap allocated `nk_context` struct
 *      @memory must point to a previously allocated memory block
 *      @size must contain the total size of @memory
 *      @font must point to a previously initialized font handle for more info look at font documentation
 *  Return values:
 *      true(1) on success
 *      false(0) on failure */
NK_API int nk_init_fixed(struct nk_context*, void *memory, nk_size size, const struct nk_user_font*);
/*  nk_init - Initializes a `nk_context` struct with memory allocation callbacks for nuklear to allocate
 *  memory from. Used internally for `nk_init_default` and provides a kitchen sink allocation
 *  interface to nuklear. Can be useful for cases like monitoring memory consumption.
 *  Parameters:
 *      @ctx must point to an either stack or heap allocated `nk_context` struct
 *      @alloc must point to a previously allocated memory allocator
 *      @font must point to a previously initialized font handle for more info look at font documentation
 *  Return values:
 *      true(1) on success
 *      false(0) on failure */
NK_API int nk_init(struct nk_context*, struct nk_allocator*, const struct nk_user_font*);
/*  nk_init_custom - Initializes a `nk_context` struct from two different either fixed or growing
 *  buffers. The first buffer is for allocating draw commands while the second buffer is
 *  used for allocating windows, panels and state tables.
 *  Parameters:
 *      @ctx must point to an either stack or heap allocated `nk_context` struct
 *      @cmds must point to a previously initialized memory buffer either fixed or dynamic to store draw commands into
 *      @pool must point to a previously initialized memory buffer either fixed or dynamic to store windows, panels and tables
 *      @font must point to a previously initialized font handle for more info look at font documentation
 *  Return values:
 *      true(1) on success
 *      false(0) on failure */
NK_API int nk_init_custom(struct nk_context*, struct nk_buffer *cmds, struct nk_buffer *pool, const struct nk_user_font*);
/*  nk_clear - Resets the context state at the end of the frame. This includes mostly
 *  garbage collector tasks like removing windows or table not called and therefore
 *  used anymore.
 *  Parameters:
 *      @ctx must point to a previously initialized `nk_context` struct */
NK_API void nk_clear(struct nk_context*);
/*  nk_free - Frees all memory allocated by nuklear. Not needed if context was
 *  initialized with `nk_init_fixed`.
 *  Parameters:
 *      @ctx must point to a previously initialized `nk_context` struct */
NK_API void nk_free(struct nk_context*);
#ifdef NK_INCLUDE_COMMAND_USERDATA
/*  nk_set_user_data - Sets the currently passed userdata passed down into each draw command.
 *  Parameters:
 *      @ctx must point to a previously initialized `nk_context` struct
 *      @data handle with either pointer or index to be passed into every draw commands */
NK_API void nk_set_user_data(struct nk_context*, nk_handle handle);
#endif
/* =============================================================================
 *
 *                                  INPUT
 *
 * =============================================================================*/
/*  The input API is responsible for holding the current input state composed of
 *  mouse, key and text input states.
 *  It is worth noting that no direct os or window handling is done in nuklear.
 *  Instead all input state has to be provided by platform specific code. This in one hand
 *  expects more work from the user and complicates usage but on the other hand
 *  provides simple abstraction over a big number of platforms, libraries and other
 *  already provided functionality.
 *
 *  Usage
 *  -------------------
 *  Input state needs to be provided to nuklear by first calling `nk_input_begin`
 *  which resets internal state like delta mouse position and button transistions.
 *  After `nk_input_begin` all current input state needs to be provided. This includes
 *  mouse motion, button and key pressed and released, text input and scrolling.
 *  Both event- or state-based input handling are supported by this API
 *  and should work without problems. Finally after all input state has been
 *  mirrored `nk_input_end` needs to be called to finish input process.
 *
 *      struct nk_context ctx;
 *      nk_init_xxx(&ctx, ...);
 *      while (1) {
 *          Event evt;
 *          nk_input_begin(&ctx);
 *          while (GetEvent(&evt)) {
 *              if (evt.type == MOUSE_MOVE)
 *                  nk_input_motion(&ctx, evt.motion.x, evt.motion.y);
 *              else if (evt.type == ...) {
 *                  ...
 *              }
 *          }
 *          nk_input_end(&ctx);
 *          [...]
 *          nk_clear(&ctx);
 *      }
 *      nk_free(&ctx);
 *
 *  Reference
 *  -------------------
 *  nk_input_begin      - Begins the input mirroring process. Needs to be called before all other `nk_input_xxx` calls
 *  nk_input_motion     - Mirrors mouse cursor position
 *  nk_input_key        - Mirrors key state with either pressed or released
 *  nk_input_button     - Mirrors mouse button state with either pressed or released
 *  nk_input_scroll     - Mirrors mouse scroll values
 *  nk_input_char       - Adds a single ASCII text character into an internal text buffer
 *  nk_input_glyph      - Adds a single multi-byte UTF-8 character into an internal text buffer
 *  nk_input_unicode    - Adds a single unicode rune into an internal text buffer
 *  nk_input_end        - Ends the input mirroring process by calculating state changes. Don't call any `nk_input_xxx` function referenced above after this call
 */
enum nk_keys {
    NK_KEY_NONE,
    NK_KEY_SHIFT,
    NK_KEY_CTRL,
    NK_KEY_DEL,
    NK_KEY_ENTER,
    NK_KEY_TAB,
    NK_KEY_BACKSPACE,
    NK_KEY_COPY,
    NK_KEY_CUT,
    NK_KEY_PASTE,
    NK_KEY_UP,
    NK_KEY_DOWN,
    NK_KEY_LEFT,
    NK_KEY_RIGHT,
    /* Shortcuts: text field */
    NK_KEY_TEXT_INSERT_MODE,
    NK_KEY_TEXT_REPLACE_MODE,
    NK_KEY_TEXT_RESET_MODE,
    NK_KEY_TEXT_LINE_START,
    NK_KEY_TEXT_LINE_END,
    NK_KEY_TEXT_START,
    NK_KEY_TEXT_END,
    NK_KEY_TEXT_UNDO,
    NK_KEY_TEXT_REDO,
    NK_KEY_TEXT_SELECT_ALL,
    NK_KEY_TEXT_WORD_LEFT,
    NK_KEY_TEXT_WORD_RIGHT,
    /* Shortcuts: scrollbar */
    NK_KEY_SCROLL_START,
    NK_KEY_SCROLL_END,
    NK_KEY_SCROLL_DOWN,
    NK_KEY_SCROLL_UP,
    NK_KEY_MAX
};
enum nk_buttons {
    NK_BUTTON_LEFT,
    NK_BUTTON_MIDDLE,
    NK_BUTTON_RIGHT,
    NK_BUTTON_DOUBLE,
    NK_BUTTON_MAX
};
/*  nk_input_begin - Begins the input mirroring process by resetting text, scroll
 *  mouse previous mouse position and movement as well as key state transitions,
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct */
NK_API void nk_input_begin(struct nk_context*);
/*  nk_input_motion - Mirrors current mouse position to nuklear
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @x must contain an integer describing the current mouse cursor x-position
 *      @y must contain an integer describing the current mouse cursor y-position */
NK_API void nk_input_motion(struct nk_context*, int x, int y);
/*  nk_input_key - Mirrors state of a specific key to nuklear
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @key must be any value specified in enum `nk_keys` that needs to be mirrored
 *      @down must be 0 for key is up and 1 for key is down */
NK_API void nk_input_key(struct nk_context*, enum nk_keys, int down);
/*  nk_input_button - Mirrors the state of a specific mouse button to nuklear
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @nk_buttons must be any value specified in enum `nk_buttons` that needs to be mirrored
 *      @x must contain an integer describing mouse cursor x-position on click up/down
 *      @y must contain an integer describing mouse cursor y-position on click up/down
 *      @down must be 0 for key is up and 1 for key is down */
NK_API void nk_input_button(struct nk_context*, enum nk_buttons, int x, int y, int down);
/*  nk_input_scroll - Copies the last mouse scroll value to nuklear. Is generally
 *  a  scroll value. So does not have to come from mouse and could also originate
 *  from touch for example.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @val vector with both X- as well as Y-scroll value */
NK_API void nk_input_scroll(struct nk_context*, struct nk_vec2 val);
/*  nk_input_char - Copies a single ASCII character into an internal text buffer
 *  This is basically a helper function to quickly push ASCII characters into
 *  nuklear. Note that you can only push up to NK_INPUT_MAX bytes into
 *  struct `nk_input` between `nk_input_begin` and `nk_input_end`.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @c must be a single ASCII character preferable one that can be printed */
NK_API void nk_input_char(struct nk_context*, char);
/*  nk_input_unicode - Converts a encoded unicode rune into UTF-8 and copies the result
 *  into an internal text buffer.
 *  Note that you can only push up to NK_INPUT_MAX bytes into
 *  struct `nk_input` between `nk_input_begin` and `nk_input_end`.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @glyph UTF-32 unicode codepoint */
NK_API void nk_input_glyph(struct nk_context*, const nk_glyph);
/*  nk_input_unicode - Converts a unicode rune into UTF-8 and copies the result
 *  into an internal text buffer.
 *  Note that you can only push up to NK_INPUT_MAX bytes into
 *  struct `nk_input` between `nk_input_begin` and `nk_input_end`.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @glyph UTF-32 unicode codepoint */
NK_API void nk_input_unicode(struct nk_context*, nk_rune);
/*  nk_input_end - End the input mirroring process by resetting mouse grabbing
 *  state to ensure the mouse cursor is not grabbed indefinitely.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct */
NK_API void nk_input_end(struct nk_context*);
/* =============================================================================
 *
 *                                  DRAWING
 *
 * =============================================================================*/
/*  This library was designed to be render backend agnostic so it does
 *  not draw anything to screen directly. Instead all drawn shapes, widgets
 *  are made of, are buffered into memory and make up a command queue.
 *  Each frame therefore fills the command buffer with draw commands
 *  that then need to be executed by the user and his own render backend.
 *  After that the command buffer needs to be cleared and a new frame can be
 *  started. It is probably important to note that the command buffer is the main
 *  drawing API and the optional vertex buffer API only takes this format and
 *  converts it into a hardware accessible format.
 *
 *  Usage
 *  -------------------
 *  To draw all draw commands accumulated over a frame you need your own render
 *  backend able to draw a number of 2D primitives. This includes at least
 *  filled and stroked rectangles, circles, text, lines, triangles and scissors.
 *  As soon as this criterion is met you can iterate over each draw command
 *  and execute each draw command in a interpreter like fashion:
 *
 *      const struct nk_command *cmd = 0;
 *      nk_foreach(cmd, &ctx) {
 *      switch (cmd->type) {
 *      case NK_COMMAND_LINE:
 *          your_draw_line_function(...)
 *          break;
 *      case NK_COMMAND_RECT
 *          your_draw_rect_function(...)
 *          break;
 *      case ...:
 *          [...]
 *      }
 *
 *  In program flow context draw commands need to be executed after input has been
 *  gathered and the complete UI with windows and their contained widgets have
 *  been executed and before calling `nk_clear` which frees all previously
 *  allocated draw commands.
 *
 *      struct nk_context ctx;
 *      nk_init_xxx(&ctx, ...);
 *      while (1) {
 *          Event evt;
 *          nk_input_begin(&ctx);
 *          while (GetEvent(&evt)) {
 *              if (evt.type == MOUSE_MOVE)
 *                  nk_input_motion(&ctx, evt.motion.x, evt.motion.y);
 *              else if (evt.type == [...]) {
 *                  [...]
 *              }
 *          }
 *          nk_input_end(&ctx);
 *
 *          [...]
 *
 *          const struct nk_command *cmd = 0;
 *          nk_foreach(cmd, &ctx) {
 *          switch (cmd->type) {
 *          case NK_COMMAND_LINE:
 *              your_draw_line_function(...)
 *              break;
 *          case NK_COMMAND_RECT
 *              your_draw_rect_function(...)
 *              break;
 *          case ...:
 *              [...]
 *          }
 *          nk_clear(&ctx);
 *      }
 *      nk_free(&ctx);
 *
 *  You probably noticed that you have to draw all of the UI each frame which is
 *  quite wasteful. While the actual UI updating loop is quite fast rendering
 *  without actually needing it is not. So there are multiple things you could do.
 *
 *  First is only update on input. This of course is only an option if your
 *  application only depends on the UI and does not require any outside calculations.
 *  If you actually only update on input make sure to update the UI two times each
 *  frame and call `nk_clear` directly after the first pass and only draw in
 *  the second pass. In addition it is recommended to also add additional timers
 *  to make sure the UI is not drawn more than a fixed number of frames per second.
 *
 *      struct nk_context ctx;
 *      nk_init_xxx(&ctx, ...);
 *      while (1) {
 *          [...wait for input ]
 *
 *          [...do two UI passes ...]
 *          do_ui(...)
 *          nk_clear(&ctx);
 *          do_ui(...)
 *
 *          const struct nk_command *cmd = 0;
 *          nk_foreach(cmd, &ctx) {
 *          switch (cmd->type) {
 *          case NK_COMMAND_LINE:
 *              your_draw_line_function(...)
 *              break;
 *          case NK_COMMAND_RECT
 *              your_draw_rect_function(...)
 *              break;
 *          case ...:
 *              [...]
 *          }
 *          nk_clear(&ctx);
 *      }
 *      nk_free(&ctx);
 *
 *  The second probably more applicable trick is to only draw if anything changed.
 *  It is not really useful for applications with continuous draw loop but
 *  quite useful for desktop applications. To actually get nuklear to only
 *  draw on changes you first have to define `NK_ZERO_COMMAND_MEMORY` and
 *  allocate a memory buffer that will store each unique drawing output.
 *  After each frame you compare the draw command memory inside the library
 *  with your allocated buffer by memcmp. If memcmp detects differences
 *  you have to copy the command buffer into the allocated buffer
 *  and then draw like usual (this example uses fixed memory but you could
 *  use dynamically allocated memory).
 *
 *      [... other defines ...]
 *      #define NK_ZERO_COMMAND_MEMORY
 *      #include "nuklear.h"
 *
 *      struct nk_context ctx;
 *      void *last = calloc(1,64*1024);
 *      void *buf = calloc(1,64*1024);
 *      nk_init_fixed(&ctx, buf, 64*1024);
 *      while (1) {
 *          [...input...]
 *          [...ui...]
 *
 *          void *cmds = nk_buffer_memory(&ctx.memory);
 *          if (memcmp(cmds, last, ctx.memory.allocated)) {
 *              memcpy(last,cmds,ctx.memory.allocated);
 *              const struct nk_command *cmd = 0;
 *              nk_foreach(cmd, &ctx) {
 *                  switch (cmd->type) {
 *                  case NK_COMMAND_LINE:
 *                      your_draw_line_function(...)
 *                      break;
 *                  case NK_COMMAND_RECT
 *                      your_draw_rect_function(...)
 *                      break;
 *                  case ...:
 *                      [...]
 *                  }
 *              }
 *          }
 *          nk_clear(&ctx);
 *      }
 *      nk_free(&ctx);
 *
 *  Finally while using draw commands makes sense for higher abstracted platforms like
 *  X11 and Win32 or drawing libraries it is often desirable to use graphics
 *  hardware directly. Therefore it is possible to just define
 *  `NK_INCLUDE_VERTEX_BUFFER_OUTPUT` which includes optional vertex output.
 *  To access the vertex output you first have to convert all draw commands into
 *  vertexes by calling `nk_convert` which takes in your preferred vertex format.
 *  After successfully converting all draw commands just iterate over and execute all
 *  vertex draw commands:
 *
 *      struct nk_convert_config cfg = {};
 *      static const struct nk_draw_vertex_layout_element vertex_layout[] = {
 *          {NK_VERTEX_POSITION, NK_FORMAT_FLOAT, NK_OFFSETOF(struct your_vertex, pos)},
 *          {NK_VERTEX_TEXCOORD, NK_FORMAT_FLOAT, NK_OFFSETOF(struct your_vertex, uv)},
 *          {NK_VERTEX_COLOR, NK_FORMAT_R8G8B8A8, NK_OFFSETOF(struct your_vertex, col)},
 *          {NK_VERTEX_LAYOUT_END}
 *      };
 *      cfg.shape_AA = NK_ANTI_ALIASING_ON;
 *      cfg.line_AA = NK_ANTI_ALIASING_ON;
 *      cfg.vertex_layout = vertex_layout;
 *      cfg.vertex_size = sizeof(struct your_vertex);
 *      cfg.vertex_alignment = NK_ALIGNOF(struct your_vertex);
 *      cfg.circle_segment_count = 22;
 *      cfg.curve_segment_count = 22;
 *      cfg.arc_segment_count = 22;
 *      cfg.global_alpha = 1.0f;
 *      cfg.null = dev->null;
 *
 *      struct nk_buffer cmds, verts, idx;
 *      nk_buffer_init_default(&cmds);
 *      nk_buffer_init_default(&verts);
 *      nk_buffer_init_default(&idx);
 *      nk_convert(&ctx, &cmds, &verts, &idx, &cfg);
 *      nk_draw_foreach(cmd, &ctx, &cmds) {
 *          if (!cmd->elem_count) continue;
 *          [...]
 *      }
 *      nk_buffer_free(&cms);
 *      nk_buffer_free(&verts);
 *      nk_buffer_free(&idx);
 *
 *  Reference
 *  -------------------
 *  nk__begin           - Returns the first draw command in the context draw command list to be drawn
 *  nk__next            - Increments the draw command iterator to the next command inside the context draw command list
 *  nk_foreach          - Iterates over each draw command inside the context draw command list
 *
 *  nk_convert          - Converts from the abstract draw commands list into a hardware accessible vertex format
 *  nk__draw_begin      - Returns the first vertex command in the context vertex draw list to be executed
 *  nk__draw_next       - Increments the vertex command iterator to the next command inside the context vertex command list
 *  nk__draw_end        - Returns the end of the vertex draw list
 *  nk_draw_foreach     - Iterates over each vertex draw command inside the vertex draw list
 */
enum nk_anti_aliasing {NK_ANTI_ALIASING_OFF, NK_ANTI_ALIASING_ON};
enum nk_convert_result {
    NK_CONVERT_SUCCESS = 0,
    NK_CONVERT_INVALID_PARAM = 1,
    NK_CONVERT_COMMAND_BUFFER_FULL = NK_FLAG(1),
    NK_CONVERT_VERTEX_BUFFER_FULL = NK_FLAG(2),
    NK_CONVERT_ELEMENT_BUFFER_FULL = NK_FLAG(3)
};
struct nk_draw_null_texture {
    nk_handle texture; /* texture handle to a texture with a white pixel */
    struct nk_vec2 uv; /* coordinates to a white pixel in the texture  */
};
struct nk_convert_config {
    float global_alpha; /* global alpha value */
    enum nk_anti_aliasing line_AA; /* line anti-aliasing flag can be turned off if you are tight on memory */
    enum nk_anti_aliasing shape_AA; /* shape anti-aliasing flag can be turned off if you are tight on memory */
    unsigned circle_segment_count; /* number of segments used for circles: default to 22 */
    unsigned arc_segment_count; /* number of segments used for arcs: default to 22 */
    unsigned curve_segment_count; /* number of segments used for curves: default to 22 */
    struct nk_draw_null_texture null; /* handle to texture with a white pixel for shape drawing */
    const struct nk_draw_vertex_layout_element *vertex_layout; /* describes the vertex output format and packing */
    nk_size vertex_size; /* sizeof one vertex for vertex packing */
    nk_size vertex_alignment; /* vertex alignment: Can be obtained by NK_ALIGNOF */
};
/*  nk__begin - Returns a draw command list iterator to iterate all draw
 *  commands accumulated over one frame.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct at the end of a frame
 *  Return values:
 *      draw command pointer pointing to the first command inside the draw command list  */
NK_API const struct nk_command* nk__begin(struct nk_context*);
/*  nk__next - Returns a draw command list iterator to iterate all draw
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct at the end of a frame
 *      @cmd must point to an previously a draw command either returned by `nk__begin` or `nk__next`
 *  Return values:
 *      draw command pointer pointing to the next command inside the draw command list  */
NK_API const struct nk_command* nk__next(struct nk_context*, const struct nk_command*);
/*  nk_foreach - Iterates over each draw command inside the context draw command list
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct at the end of a frame
 *      @cmd pointer initialized to NULL */
#define nk_foreach(c, ctx) for((c) = nk__begin(ctx); (c) != 0; (c) = nk__next(ctx,c))
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
/*  nk_convert - converts all internal draw command into vertex draw commands and fills
 *  three buffers with vertexes, vertex draw commands and vertex indices. The vertex format
 *  as well as some other configuration values have to be configured by filling out a
 *  `nk_convert_config` struct.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct at the end of a frame
 *      @cmds must point to a previously initialized buffer to hold converted vertex draw commands
 *      @vertices must point to a previously initialized buffer to hold all produced vertices
 *      @elements must point to a previously initialized buffer to hold all produced vertex indices
 *      @config must point to a filled out `nk_config` struct to configure the conversion process
 *  Returns:
 *      returns NK_CONVERT_SUCCESS on success and a enum nk_convert_result error values if not */
NK_API nk_flags nk_convert(struct nk_context*, struct nk_buffer *cmds, struct nk_buffer *vertices, struct nk_buffer *elements, const struct nk_convert_config*);
/*  nk__draw_begin - Returns a draw vertex command buffer iterator to iterate each the vertex draw command buffer
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct at the end of a frame
 *      @buf must point to an previously by `nk_convert` filled out vertex draw command buffer
 *  Return values:
 *      vertex draw command pointer pointing to the first command inside the vertex draw command buffer  */
NK_API const struct nk_draw_command* nk__draw_begin(const struct nk_context*, const struct nk_buffer*);
/*  nk__draw_end - Returns the vertex draw command  at the end of the vertex draw command buffer
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct at the end of a frame
 *      @buf must point to an previously by `nk_convert` filled out vertex draw command buffer
 *  Return values:
 *      vertex draw command pointer pointing to the end of the last vertex draw command inside the vertex draw command buffer  */
NK_API const struct nk_draw_command* nk__draw_end(const struct nk_context*, const struct nk_buffer*);
/*  nk__draw_next - Increments the vertex draw command buffer iterator
 *  Parameters:
 *      @cmd must point to an previously either by `nk__draw_begin` or `nk__draw_next` returned vertex draw command
 *      @buf must point to an previously by `nk_convert` filled out vertex draw command buffer
 *      @ctx must point to an previously initialized `nk_context` struct at the end of a frame
 *  Return values:
 *      vertex draw command pointer pointing to the end of the last vertex draw command inside the vertex draw command buffer  */
NK_API const struct nk_draw_command* nk__draw_next(const struct nk_draw_command*, const struct nk_buffer*, const struct nk_context*);
/*  nk_draw_foreach - Iterates over each vertex draw command inside a vertex draw command buffer
 *  Parameters:
 *      @cmd nk_draw_command pointer set to NULL
 *      @buf must point to an previously by `nk_convert` filled out vertex draw command buffer
 *      @ctx must point to an previously initialized `nk_context` struct at the end of a frame */
#define nk_draw_foreach(cmd,ctx, b) for((cmd)=nk__draw_begin(ctx, b); (cmd)!=0; (cmd)=nk__draw_next(cmd, b, ctx))
#endif
/* =============================================================================
 *
 *                                  WINDOW
 *
 * =============================================================================
 * Windows are the main persistent state used inside nuklear and are life time
 * controlled by simply "retouching" (i.e. calling) each window each frame.
 * All widgets inside nuklear can only be added inside function pair `nk_begin_xxx`
 * and `nk_end`. Calling any widgets outside these two functions will result in an
 * assert in debug or no state change in release mode.
 *
 * Each window holds frame persistent state like position, size, flags, state tables,
 * and some garbage collected internal persistent widget state. Each window
 * is linked into a window stack list which determines the drawing and overlapping
 * order. The topmost window thereby is the currently active window.
 *
 * To change window position inside the stack occurs either automatically by
 * user input by being clicked on or programmatically by calling `nk_window_focus`.
 * Windows by default are visible unless explicitly being defined with flag
 * `NK_WINDOW_HIDDEN`, the user clicked the close button on windows with flag
 * `NK_WINDOW_CLOSABLE` or if a window was explicitly hidden by calling
 * `nk_window_show`. To explicitly close and destroy a window call `nk_window_close`.
 *
 * Usage
 * -------------------
 * To create and keep a window you have to call one of the two `nk_begin_xxx`
 * functions to start window declarations and `nk_end` at the end. Furthermore it
 * is recommended to check the return value of `nk_begin_xxx` and only process
 * widgets inside the window if the value is not 0. Either way you have to call
 * `nk_end` at the end of window declarations. Furthermore, do not attempt to
 * nest `nk_begin_xxx` calls which will hopefully result in an assert or if not
 * in a segmentation fault.
 *
 *      if (nk_begin_xxx(...) {
 *          [... widgets ...]
 *      }
 *      nk_end(ctx);
 *
 * In the grand concept window and widget declarations need to occur after input
 * handling and before drawing to screen. Not doing so can result in higher
 * latency or at worst invalid behavior. Furthermore make sure that `nk_clear`
 * is called at the end of the frame. While nuklear's default platform backends
 * already call `nk_clear` for you if you write your own backend not calling
 * `nk_clear` can cause asserts or even worse undefined behavior.
 *
 *      struct nk_context ctx;
 *      nk_init_xxx(&ctx, ...);
 *      while (1) {
 *          Event evt;
 *          nk_input_begin(&ctx);
 *          while (GetEvent(&evt)) {
 *              if (evt.type == MOUSE_MOVE)
 *                  nk_input_motion(&ctx, evt.motion.x, evt.motion.y);
 *              else if (evt.type == [...]) {
 *                  nk_input_xxx(...);
 *              }
 *          }
 *          nk_input_end(&ctx);
 *
 *          if (nk_begin_xxx(...) {
 *              [...]
 *          }
 *          nk_end(ctx);
 *
 *          const struct nk_command *cmd = 0;
 *          nk_foreach(cmd, &ctx) {
 *          case NK_COMMAND_LINE:
 *              your_draw_line_function(...)
 *              break;
 *          case NK_COMMAND_RECT
 *              your_draw_rect_function(...)
 *              break;
 *          case ...:
 *              [...]
 *          }
 *          nk_clear(&ctx);
 *      }
 *      nk_free(&ctx);
 *
 *  Reference
 *  -------------------
 *  nk_begin                            - starts a new window; needs to be called every frame for every window (unless hidden) or otherwise the window gets removed
 *  nk_begin_titled                     - extended window start with separated title and identifier to allow multiple windows with same name but not title
 *  nk_end                              - needs to be called at the end of the window building process to process scaling, scrollbars and general cleanup
 *
 *  nk_window_find                      - finds and returns the window with give name
 *  nk_window_get_bounds                - returns a rectangle with screen position and size of the currently processed window.
 *  nk_window_get_position              - returns the position of the currently processed window
 *  nk_window_get_size                  - returns the size with width and height of the currently processed window
 *  nk_window_get_width                 - returns the width of the currently processed window
 *  nk_window_get_height                - returns the height of the currently processed window
 *  nk_window_get_panel                 - returns the underlying panel which contains all processing state of the current window
 *  nk_window_get_content_region        - returns the position and size of the currently visible and non-clipped space inside the currently processed window
 *  nk_window_get_content_region_min    - returns the upper rectangle position of the currently visible and non-clipped space inside the currently processed window
 *  nk_window_get_content_region_max    - returns the upper rectangle position of the currently visible and non-clipped space inside the currently processed window
 *  nk_window_get_content_region_size   - returns the size of the currently visible and non-clipped space inside the currently processed window
 *  nk_window_get_canvas                - returns the draw command buffer. Can be used to draw custom widgets
 *
 *  nk_window_has_focus                 - returns if the currently processed window is currently active
 *  nk_window_is_collapsed              - returns if the window with given name is currently minimized/collapsed
 *  nk_window_is_closed                 - returns if the currently processed window was closed
 *  nk_window_is_hidden                 - returns if the currently processed window was hidden
 *  nk_window_is_active                 - same as nk_window_has_focus for some reason
 *  nk_window_is_hovered                - returns if the currently processed window is currently being hovered by mouse
 *  nk_window_is_any_hovered            - return if any window currently hovered
 *  nk_item_is_any_active               - returns if any window or widgets is currently hovered or active
 *
 *  nk_window_set_bounds                - updates position and size of the currently processed window
 *  nk_window_set_position              - updates position of the currently process window
 *  nk_window_set_size                  - updates the size of the currently processed window
 *  nk_window_set_focus                 - set the currently processed window as active window
 *
 *  nk_window_close                     - closes the window with given window name which deletes the window at the end of the frame
 *  nk_window_collapse                  - collapses the window with given window name
 *  nk_window_collapse_if               - collapses the window with given window name if the given condition was met
 *  nk_window_show                      - hides a visible or reshows a hidden window
 *  nk_window_show_if                   - hides/shows a window depending on condition
 */
enum nk_panel_flags {
    NK_WINDOW_BORDER            = NK_FLAG(0), /* Draws a border around the window to visually separate window from the background */
    NK_WINDOW_MOVABLE           = NK_FLAG(1), /* The movable flag indicates that a window can be moved by user input or by dragging the window header */
    NK_WINDOW_SCALABLE          = NK_FLAG(2), /* The scalable flag indicates that a window can be scaled by user input by dragging a scaler icon at the button of the window */
    NK_WINDOW_CLOSABLE          = NK_FLAG(3), /* adds a closable icon into the header */
    NK_WINDOW_MINIMIZABLE       = NK_FLAG(4), /* adds a minimize icon into the header */
    NK_WINDOW_NO_SCROLLBAR      = NK_FLAG(5), /* Removes the scrollbar from the window */
    NK_WINDOW_TITLE             = NK_FLAG(6), /* Forces a header at the top at the window showing the title */
    NK_WINDOW_SCROLL_AUTO_HIDE  = NK_FLAG(7), /* Automatically hides the window scrollbar if no user interaction: also requires delta time in `nk_context` to be set each frame */
    NK_WINDOW_BACKGROUND        = NK_FLAG(8), /* Always keep window in the background */
    NK_WINDOW_SCALE_LEFT        = NK_FLAG(9), /* Puts window scaler in the left-ottom corner instead right-bottom*/
    NK_WINDOW_NO_INPUT          = NK_FLAG(10) /* Prevents window of scaling, moving or getting focus */
};
/*  nk_begin - starts a new window; needs to be called every frame for every window (unless hidden) or otherwise the window gets removed
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @title window title and identifier. Needs to be persistent over frames to identify the window
 *      @bounds initial position and window size. However if you do not define `NK_WINDOW_SCALABLE` or `NK_WINDOW_MOVABLE` you can set window position and size every frame
 *      @flags window flags defined in `enum nk_panel_flags` with a number of different window behaviors
 *  Return values:
 *      returns 1 if the window can be filled up with widgets from this point until `nk_end or 0 otherwise for example if minimized `*/
NK_API int nk_begin(struct nk_context *ctx, const char *title, struct nk_rect bounds, nk_flags flags);
/*  nk_begin_titled - extended window start with separated title and identifier to allow multiple windows with same name but not title
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name window identifier. Needs to be persistent over frames to identify the window
 *      @title window title displayed inside header if flag `NK_WINDOW_TITLE` or either `NK_WINDOW_CLOSABLE` or `NK_WINDOW_MINIMIZED` was set
 *      @bounds initial position and window size. However if you do not define `NK_WINDOW_SCALABLE` or `NK_WINDOW_MOVABLE` you can set window position and size every frame
 *      @flags window flags defined in `enum nk_panel_flags` with a number of different window behaviors
 *  Return values:
 *      returns 1 if the window can be filled up with widgets from this point until `nk_end or 0 otherwise `*/
NK_API int nk_begin_titled(struct nk_context *ctx, const char *name, const char *title, struct nk_rect bounds, nk_flags flags);
/*  nk_end - needs to be called at the end of the window building process to process scaling, scrollbars and general cleanup.
 *  All widget calls after this functions will result in asserts or no state changes
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct */
NK_API void nk_end(struct nk_context *ctx);
/*  nk_window_find - finds and returns the window with give name
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name window identifier
 *  Return values:
 *      returns a `nk_window` struct pointing to the identified window or 0 if no window with given name was found */
NK_API struct nk_window *nk_window_find(struct nk_context *ctx, const char *name);
/*  nk_window_get_bounds - returns a rectangle with screen position and size of the currently processed window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns a `nk_rect` struct with window upper left position and size */
NK_API struct nk_rect nk_window_get_bounds(const struct nk_context *ctx);
/*  nk_window_get_position - returns the position of the currently processed window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns a `nk_vec2` struct with window upper left position */
NK_API struct nk_vec2 nk_window_get_position(const struct nk_context *ctx);
/*  nk_window_get_size - returns the size with width and height of the currently processed window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns a `nk_vec2` struct with window size */
NK_API struct nk_vec2 nk_window_get_size(const struct nk_context*);
/*  nk_window_get_width - returns the width of the currently processed window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns the window width */
NK_API float nk_window_get_width(const struct nk_context*);
/*  nk_window_get_height - returns the height of the currently processed window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns the window height */
NK_API float nk_window_get_height(const struct nk_context*);
/*  nk_window_get_panel - returns the underlying panel which contains all processing state of the current window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns a pointer to window internal `nk_panel` state. DO NOT keep this pointer around it is only valid until `nk_end` */
NK_API struct nk_panel* nk_window_get_panel(struct nk_context*);
/*  nk_window_get_content_region - returns the position and size of the currently visible and non-clipped space inside the currently processed window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns `nk_rect` struct with screen position and size (no scrollbar offset) of the visible space inside the current window */
NK_API struct nk_rect nk_window_get_content_region(struct nk_context*);
/*  nk_window_get_content_region_min - returns the upper left position of the currently visible and non-clipped space inside the currently processed window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns `nk_vec2` struct with  upper left screen position (no scrollbar offset) of the visible space inside the current window */
NK_API struct nk_vec2 nk_window_get_content_region_min(struct nk_context*);
/*  nk_window_get_content_region_max - returns the lower right screen position of the currently visible and non-clipped space inside the currently processed window.
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns `nk_vec2` struct with lower right screen position (no scrollbar offset) of the visible space inside the current window */
NK_API struct nk_vec2 nk_window_get_content_region_max(struct nk_context*);
/*  nk_window_get_content_region_size - returns the size of the currently visible and non-clipped space inside the currently processed window
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns `nk_vec2` struct with size the visible space inside the current window */
NK_API struct nk_vec2 nk_window_get_content_region_size(struct nk_context*);
/*  nk_window_get_canvas - returns the draw command buffer. Can be used to draw custom widgets
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns a pointer to window internal `nk_command_buffer` struct used as drawing canvas. Can be used to do custom drawing */
NK_API struct nk_command_buffer* nk_window_get_canvas(struct nk_context*);
/*  nk_window_has_focus - returns if the currently processed window is currently active
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns 0 if current window is not active or 1 if it is */
NK_API int nk_window_has_focus(const struct nk_context*);
/*  nk_window_is_collapsed - returns if the window with given name is currently minimized/collapsed
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of window you want to check is collapsed
 *  Return values:
 *      returns 1 if current window is minimized and 0 if window not found or is not minimized */
NK_API int nk_window_is_collapsed(struct nk_context *ctx, const char *name);
/*  nk_window_is_closed - returns if the window with given name was closed by calling `nk_close`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of window you want to check is closed
 *  Return values:
 *      returns 1 if current window was closed or 0 window not found or not closed */
NK_API int nk_window_is_closed(struct nk_context*, const char*);
/*  nk_window_is_hidden - returns if the window with given name is hidden
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of window you want to check is hidden
 *  Return values:
 *      returns 1 if current window is hidden or 0 window not found or visible */
NK_API int nk_window_is_hidden(struct nk_context*, const char*);
/*  nk_window_is_active - same as nk_window_has_focus for some reason
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of window you want to check is hidden
 *  Return values:
 *      returns 1 if current window is active or 0 window not found or not active */
NK_API int nk_window_is_active(struct nk_context*, const char*);
/*  nk_window_is_hovered - return if the current window is being hovered
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns 1 if current window is hovered or 0 otherwise */
NK_API int nk_window_is_hovered(struct nk_context*);
/*  nk_window_is_any_hovered - returns if the any window is being hovered
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns 1 if any window is hovered or 0 otherwise */
NK_API int nk_window_is_any_hovered(struct nk_context*);
/*  nk_item_is_any_active - returns if the any window is being hovered or any widget is currently active.
 *  Can be used to decide if input should be processed by UI or your specific input handling.
 *  Example could be UI and 3D camera to move inside a 3D space.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *  Return values:
 *      returns 1 if any window is hovered or any item is active or 0 otherwise */
NK_API int nk_item_is_any_active(struct nk_context*);
/*  nk_window_set_bounds - updates position and size of the currently processed window
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to modify both position and size
 *      @bounds points to a `nk_rect` struct with the new position and size of currently active window */
NK_API void nk_window_set_bounds(struct nk_context*, const char *name, struct nk_rect bounds);
/*  nk_window_set_position - updates position of the currently processed window
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to modify position of
 *      @pos points to a `nk_vec2` struct with the new position of currently active window */
NK_API void nk_window_set_position(struct nk_context*, const char *name, struct nk_vec2 pos);
/*  nk_window_set_size - updates size of the currently processed window
 *  IMPORTANT: only call this function between calls `nk_begin_xxx` and `nk_end`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to modify size of
 *      @size points to a `nk_vec2` struct with the new size of currently active window */
NK_API void nk_window_set_size(struct nk_context*, const char *name, struct nk_vec2);
/*  nk_window_set_focus - sets the window with given name as active
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to be set active */
NK_API void nk_window_set_focus(struct nk_context*, const char *name);
/*  nk_window_close - closed a window and marks it for being freed at the end of the frame
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to be closed */
NK_API void nk_window_close(struct nk_context *ctx, const char *name);
/*  nk_window_collapse - updates collapse state of a window with given name
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to be either collapse or maximize */
NK_API void nk_window_collapse(struct nk_context*, const char *name, enum nk_collapse_states state);
/*  nk_window_collapse - updates collapse state of a window with given name if given condition is met
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to be either collapse or maximize
 *      @state the window should be put into
 *      @condition that has to be true to actually commit the collapse state change */
NK_API void nk_window_collapse_if(struct nk_context*, const char *name, enum nk_collapse_states, int cond);
/*  nk_window_show - updates visibility state of a window with given name
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to be either collapse or maximize
 *      @state with either visible or hidden to modify the window with */
NK_API void nk_window_show(struct nk_context*, const char *name, enum nk_show_states);
/*  nk_window_show_if - updates visibility state of a window with given name if a given condition is met
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @name of the window to be either collapse or maximize
 *      @state with either visible or hidden to modify the window with
 *      @condition that has to be true to actually commit the visible state change */
NK_API void nk_window_show_if(struct nk_context*, const char *name, enum nk_show_states, int cond);
/* =============================================================================
 *
 *                                  LAYOUT
 *
 * ============================================================================= */
/*  Layouting in general describes placing widget inside a window with position and size.
 *  While in this particular implementation there are five different APIs for layouting
 *  each with different trade offs between control and ease of use.
 *
 *  All layouting methods in this library are based around the concept of a row.
 *  A row has a height the window content grows by and a number of columns and each
 *  layouting method specifies how each widget is placed inside the row.
 *  After a row has been allocated by calling a layouting functions and then
 *  filled with widgets will advance an internal pointer over the allocated row.
 *
 *  To actually define a layout you just call the appropriate layouting function
 *  and each subsequent widget call will place the widget as specified. Important
 *  here is that if you define more widgets then columns defined inside the layout
 *  functions it will allocate the next row without you having to make another layouting
 *  call.
 *
 *  Biggest limitation with using all these APIs outside the `nk_layout_space_xxx` API
 *  is that you have to define the row height for each. However the row height
 *  often depends on the height of the font.
 *
 *  To fix that internally nuklear uses a minimum row height that is set to the
 *  height plus padding of currently active font and overwrites the row height
 *  value if zero.
 *
 *  If you manually want to change the minimum row height then
 *  use nk_layout_set_min_row_height, and use nk_layout_reset_min_row_height to
 *  reset it back to be derived from font height.
 *
 *  Also if you change the font in nuklear it will automatically change the minimum
 *  row height for you and. This means if you change the font but still want
 *  a minimum row height smaller than the font you have to repush your value.
 *
 *  For actually more advanced UI I would even recommend using the `nk_layout_space_xxx`
 *  layouting method in combination with a cassowary constraint solver (there are
 *  some versions on github with permissive license model) to take over all control over widget
 *  layouting yourself. However for quick and dirty layouting using all the other layouting
 *  functions should be fine.
 *
 *  Usage
 *  -------------------
 *  1.) nk_layout_row_dynamic
 *  The easiest layouting function is `nk_layout_row_dynamic`. It provides each
 *  widgets with same horizontal space inside the row and dynamically grows
 *  if the owning window grows in width. So the number of columns dictates
 *  the size of each widget dynamically by formula:
 *
 *      widget_width = (window_width - padding - spacing) * (1/colum_count)
 *
 *  Just like all other layouting APIs if you define more widget than columns this
 *  library will allocate a new row and keep all layouting parameters previously
 *  defined.
 *
 *      if (nk_begin_xxx(...) {
 *          // first row with height: 30 composed of two widgets
 *          nk_layout_row_dynamic(&ctx, 30, 2);
 *          nk_widget(...);
 *          nk_widget(...);
 *
 *          // second row with same parameter as defined above
 *          nk_widget(...);
 *          nk_widget(...);
 *
 *          // third row uses 0 for height which will use auto layouting
 *          nk_layout_row_dynamic(&ctx, 0, 2);
 *          nk_widget(...);
 *          nk_widget(...);
 *      }
 *      nk_end(...);
 *
 *  2.) nk_layout_row_static
 *  Another easy layouting function is `nk_layout_row_static`. It provides each
 *  widget with same horizontal pixel width inside the row and does not grow
 *  if the owning window scales smaller or bigger.
 *
 *      if (nk_begin_xxx(...) {
 *          // first row with height: 30 composed of two widgets with width: 80
 *          nk_layout_row_static(&ctx, 30, 80, 2);
 *          nk_widget(...);
 *          nk_widget(...);
 *
 *          // second row with same parameter as defined above
 *          nk_widget(...);
 *          nk_widget(...);
 *
 *          // third row uses 0 for height which will use auto layouting
 *          nk_layout_row_static(&ctx, 0, 80, 2);
 *          nk_widget(...);
 *          nk_widget(...);
 *      }
 *      nk_end(...);
 *
 *  3.) nk_layout_row_xxx
 *  A little bit more advanced layouting API are functions `nk_layout_row_begin`,
 *  `nk_layout_row_push` and `nk_layout_row_end`. They allow to directly
 *  specify each column pixel or window ratio in a row. It supports either
 *  directly setting per column pixel width or widget window ratio but not
 *  both. Furthermore it is a immediate mode API so each value is directly
 *  pushed before calling a widget. Therefore the layout is not automatically
 *  repeating like the last two layouting functions.
 *
 *      if (nk_begin_xxx(...) {
 *          // first row with height: 25 composed of two widgets with width 60 and 40
 *          nk_layout_row_begin(ctx, NK_STATIC, 25, 2);
 *          nk_layout_row_push(ctx, 60);
 *          nk_widget(...);
 *          nk_layout_row_push(ctx, 40);
 *          nk_widget(...);
 *          nk_layout_row_end(ctx);
 *
 *          // second row with height: 25 composed of two widgets with window ratio 0.25 and 0.75
 *          nk_layout_row_begin(ctx, NK_DYNAMIC, 25, 2);
 *          nk_layout_row_push(ctx, 0.25f);
 *          nk_widget(...);
 *          nk_layout_row_push(ctx, 0.75f);
 *          nk_widget(...);
 *          nk_layout_row_end(ctx);
 *
 *          // third row with auto generated height: composed of two widgets with window ratio 0.25 and 0.75
 *          nk_layout_row_begin(ctx, NK_DYNAMIC, 0, 2);
 *          nk_layout_row_push(ctx, 0.25f);
 *          nk_widget(...);
 *          nk_layout_row_push(ctx, 0.75f);
 *          nk_widget(...);
 *          nk_layout_row_end(ctx);
 *      }
 *      nk_end(...);
 *
 *  4.) nk_layout_row
 *  The array counterpart to API nk_layout_row_xxx is the single nk_layout_row
 *  functions. Instead of pushing either pixel or window ratio for every widget
 *  it allows to define it by array. The trade of for less control is that
 *  `nk_layout_row` is automatically repeating. Otherwise the behavior is the
 *  same.
 *
 *      if (nk_begin_xxx(...) {
 *          // two rows with height: 30 composed of two widgets with width 60 and 40
 *          const float size[] = {60,40};
 *          nk_layout_row(ctx, NK_STATIC, 30, 2, ratio);
 *          nk_widget(...);
 *          nk_widget(...);
 *          nk_widget(...);
 *          nk_widget(...);
 *
 *          // two rows with height: 30 composed of two widgets with window ratio 0.25 and 0.75
 *          const float ratio[] = {0.25, 0.75};
 *          nk_layout_row(ctx, NK_DYNAMIC, 30, 2, ratio);
 *          nk_widget(...);
 *          nk_widget(...);
 *          nk_widget(...);
 *          nk_widget(...);
 *
 *          // two rows with auto generated height composed of two widgets with window ratio 0.25 and 0.75
 *          const float ratio[] = {0.25, 0.75};
 *          nk_layout_row(ctx, NK_DYNAMIC, 30, 2, ratio);
 *          nk_widget(...);
 *          nk_widget(...);
 *          nk_widget(...);
 *          nk_widget(...);
 *      }
 *      nk_end(...);
 *
 *  5.) nk_layout_row_template_xxx
 *  The most complex and second most flexible API is a simplified flexbox version without
 *  line wrapping and weights for dynamic widgets. It is an immediate mode API but
 *  unlike `nk_layout_row_xxx` it has auto repeat behavior and needs to be called
 *  before calling the templated widgets.
 *  The row template layout has three different per widget size specifier. The first
 *  one is the static widget size specifier with fixed widget pixel width. They do
 *  not grow if the row grows and will always stay the same. The second size
 *  specifier is nk_layout_row_template_push_variable which defines a
 *  minimum widget size but it also can grow if more space is available not taken
 *  by other widgets. Finally there are dynamic widgets which are completely flexible
 *  and unlike variable widgets can even shrink to zero if not enough space
 *  is provided.
 *
 *      if (nk_begin_xxx(...) {
 *          // two rows with height: 30 composed of three widgets
 *          nk_layout_row_template_begin(ctx, 30);
 *          nk_layout_row_template_push_dynamic(ctx);
 *          nk_layout_row_template_push_variable(ctx, 80);
 *          nk_layout_row_template_push_static(ctx, 80);
 *          nk_layout_row_template_end(ctx);
 *
 *          nk_widget(...); // dynamic widget can go to zero if not enough space
 *          nk_widget(...); // variable widget with min 80 pixel but can grow bigger if enough space
 *          nk_widget(...); // static widget with fixed 80 pixel width
 *
 *          // second row same layout
 *          nk_widget(...);
 *          nk_widget(...);
 *          nk_widget(...);
 *      }
 *      nk_end(...);
 *
 *  6.) nk_layout_space_xxx
 *  Finally the most flexible API directly allows you to place widgets inside the
 *  window. The space layout API is an immediate mode API which does not support
 *  row auto repeat and directly sets position and size of a widget. Position
 *  and size hereby can be either specified as ratio of allocated space or
 *  allocated space local position and pixel size. Since this API is quite
 *  powerful there are a number of utility functions to get the available space
 *  and convert between local allocated space and screen space.
 *
 *      if (nk_begin_xxx(...) {
 *          // static row with height: 500 (you can set column count to INT_MAX if you don't want to be bothered)
 *          nk_layout_space_begin(ctx, NK_STATIC, 500, INT_MAX);
 *          nk_layout_space_push(ctx, nk_rect(0,0,150,200));
 *          nk_widget(...);
 *          nk_layout_space_push(ctx, nk_rect(200,200,100,200));
 *          nk_widget(...);
 *          nk_layout_space_end(ctx);
 *
 *          // dynamic row with height: 500 (you can set column count to INT_MAX if you don't want to be bothered)
 *          nk_layout_space_begin(ctx, NK_DYNAMIC, 500, INT_MAX);
 *          nk_layout_space_push(ctx, nk_rect(0.5,0.5,0.1,0.1));
 *          nk_widget(...);
 *          nk_layout_space_push(ctx, nk_rect(0.7,0.6,0.1,0.1));
 *          nk_widget(...);
 *      }
 *      nk_end(...);
 *
 *  Reference
 *  -------------------
 *  nk_layout_set_min_row_height            - set the currently used minimum row height to a specified value
 *  nk_layout_reset_min_row_height          - resets the currently used minimum row height to font height
 *
 *  nk_layout_widget_bounds                 - calculates current width a static layout row can fit inside a window
 *  nk_layout_ratio_from_pixel              - utility functions to calculate window ratio from pixel size
 *
 *  nk_layout_row_dynamic                   - current layout is divided into n same sized growing columns
 *  nk_layout_row_static                    - current layout is divided into n same fixed sized columns
 *  nk_layout_row_begin                     - starts a new row with given height and number of columns
 *  nk_layout_row_push                      - pushes another column with given size or window ratio
 *  nk_layout_row_end                       - finished previously started row
 *  nk_layout_row                           - specifies row columns in array as either window ratio or size
 *
 *  nk_layout_row_template_begin            - begins the row template declaration
 *  nk_layout_row_template_push_dynamic     - adds a dynamic column that dynamically grows and can go to zero if not enough space
 *  nk_layout_row_template_push_variable    - adds a variable column that dynamically grows but does not shrink below specified pixel width
 *  nk_layout_row_template_push_static      - adds a static column that does not grow and will always have the same size
 *  nk_layout_row_template_end              - marks the end of the row template
 *
 *  nk_layout_space_begin                   - begins a new layouting space that allows to specify each widgets position and size
 *  nk_layout_space_push                    - pushes position and size of the next widget in own coordinate space either as pixel or ratio
 *  nk_layout_space_end                     - marks the end of the layouting space
 *
 *  nk_layout_space_bounds                  - callable after nk_layout_space_begin and returns total space allocated
 *  nk_layout_space_to_screen               - converts vector from nk_layout_space coordinate space into screen space
 *  nk_layout_space_to_local                - converts vector from screen space into nk_layout_space coordinates
 *  nk_layout_space_rect_to_screen          - converts rectangle from nk_layout_space coordinate space into screen space
 *  nk_layout_space_rect_to_local           - converts rectangle from screen space into nk_layout_space coordinates
 */
/*  nk_layout_set_min_row_height - sets the currently used minimum row height.
 *  IMPORTANT: The passed height needs to include both your preferred row height
 *  as well as padding. No internal padding is added.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_begin_xxx`
 *      @height new minimum row height to be used for auto generating the row height */
NK_API void nk_layout_set_min_row_height(struct nk_context*, float height);
/*  nk_layout_reset_min_row_height - Reset the currently used minimum row height
 *  back to font height + text padding + additional padding (style_window.min_row_height_padding)
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_begin_xxx` */
NK_API void nk_layout_reset_min_row_height(struct nk_context*);
/*  nk_layout_widget_bounds - returns the width of the next row allocate by one of the layouting functions
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` */
NK_API struct nk_rect nk_layout_widget_bounds(struct nk_context*);
/*  nk_layout_ratio_from_pixel - utility functions to calculate window ratio from pixel size
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context`
 *      @pixel_width to convert to window ratio */
NK_API float nk_layout_ratio_from_pixel(struct nk_context*, float pixel_width);
/*  nk_layout_row_dynamic - Sets current row layout to share horizontal space
 *  between @cols number of widgets evenly. Once called all subsequent widget
 *  calls greater than @cols will allocate a new row with same layout.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_begin_xxx`
 *      @row_height holds height of each widget in row or zero for auto layouting
 *      @cols number of widget inside row */
NK_API void nk_layout_row_dynamic(struct nk_context *ctx, float height, int cols);
/*  nk_layout_row_static - Sets current row layout to fill @cols number of widgets
 *  in row with same @item_width horizontal size. Once called all subsequent widget
 *  calls greater than @cols will allocate a new row with same layout.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_begin_xxx`
 *      @height holds row height to allocate from panel for widget height
 *      @item_width holds width of each widget in row
 *      @cols number of widget inside row */
NK_API void nk_layout_row_static(struct nk_context *ctx, float height, int item_width, int cols);
/*  nk_layout_row_begin - Starts a new dynamic or fixed row with given height and columns.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_begin_xxx`
 *      @fmt either `NK_DYNAMIC` for window ratio or `NK_STATIC` for fixed size columns
 *      @row_height holds height of each widget in row or zero for auto layouting
 *      @cols number of widget inside row */
NK_API void nk_layout_row_begin(struct nk_context *ctx, enum nk_layout_format fmt, float row_height, int cols);
/*  nk_layout_row_push - Specifies either window ratio or width of a single column
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_row_begin`
 *      @value either a window ratio or fixed width depending on @fmt in previous `nk_layout_row_begin` call */
NK_API void nk_layout_row_push(struct nk_context*, float value);
/*  nk_layout_row_end - finished previously started row
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_row_begin` */
NK_API void nk_layout_row_end(struct nk_context*);
/*  nk_layout_row - specifies row columns in array as either window ratio or size
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context`
 *      @fmt either `NK_DYNAMIC` for window ratio or `NK_STATIC` for fixed size columns
 *      @row_height holds height of each widget in row or zero for auto layouting
 *      @cols number of widget inside row */
NK_API void nk_layout_row(struct nk_context*, enum nk_layout_format, float height, int cols, const float *ratio);
/*  nk_layout_row_template_begin - Begins the row template declaration
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @row_height holds height of each widget in row or zero for auto layouting */
NK_API void nk_layout_row_template_begin(struct nk_context*, float row_height);
/*  nk_layout_row_template_push_dynamic - adds a dynamic column that dynamically grows and can go to zero if not enough space
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_row_template_begin` */
NK_API void nk_layout_row_template_push_dynamic(struct nk_context*);
/*  nk_layout_row_template_push_variable - adds a variable column that dynamically grows but does not shrink below specified pixel width
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_row_template_begin`
 *      @min_width holds the minimum pixel width the next column must be */
NK_API void nk_layout_row_template_push_variable(struct nk_context*, float min_width);
/*  nk_layout_row_template_push_static - adds a static column that does not grow and will always have the same size
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_row_template_begin`
 *      @width holds the absolute pixel width value the next column must be */
NK_API void nk_layout_row_template_push_static(struct nk_context*, float width);
/*  nk_layout_row_template_end - marks the end of the row template
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_row_template_begin` */
NK_API void nk_layout_row_template_end(struct nk_context*);
/*  nk_layout_space_begin - begins a new layouting space that allows to specify each widgets position and size.
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct
 *      @fmt either `NK_DYNAMIC` for window ratio or `NK_STATIC` for fixed size columns
 *      @row_height holds height of each widget in row or zero for auto layouting
 *      @widget_count number of widgets inside row */
NK_API void nk_layout_space_begin(struct nk_context*, enum nk_layout_format, float height, int widget_count);
/*  nk_layout_space_push - pushes position and size of the next widget in own coordinate space either as pixel or ratio
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_space_begin`
 *      @bounds position and size in laoyut space local coordinates */
NK_API void nk_layout_space_push(struct nk_context*, struct nk_rect);
/*  nk_layout_space_end - marks the end of the layout space
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_space_begin` */
NK_API void nk_layout_space_end(struct nk_context*);
/*  nk_layout_space_bounds - returns total space allocated for `nk_layout_space`
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_space_begin` */
NK_API struct nk_rect nk_layout_space_bounds(struct nk_context*);
/*  nk_layout_space_to_screen - converts vector from nk_layout_space coordinate space into screen space
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_space_begin`
 *      @vec position to convert from layout space into screen coordinate space */
NK_API struct nk_vec2 nk_layout_space_to_screen(struct nk_context*, struct nk_vec2);
/*  nk_layout_space_to_screen - converts vector from layout space into screen space
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_space_begin`
 *      @vec position to convert from screen space into layout coordinate space */
NK_API struct nk_vec2 nk_layout_space_to_local(struct nk_context*, struct nk_vec2);
/*  nk_layout_space_rect_to_screen - converts rectangle from screen space into layout space
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_space_begin`
 *      @bounds rectangle to convert from layout space into screen space */
NK_API struct nk_rect nk_layout_space_rect_to_screen(struct nk_context*, struct nk_rect);
/*  nk_layout_space_rect_to_local - converts rectangle from layout space into screen space
 *  Parameters:
 *      @ctx must point to an previously initialized `nk_context` struct after call `nk_layout_space_begin`
 *      @bounds rectangle to convert from screen space into layout space */
NK_API struct nk_rect nk_layout_space_rect_to_local(struct nk_context*, struct nk_rect);
/* =============================================================================
 *
 *                                  GROUP
 *
 * ============================================================================= */
NK_API int nk_group_begin(struct nk_context*, const char *title, nk_flags);
NK_API int nk_group_scrolled_offset_begin(struct nk_context*, nk_uint *x_offset, nk_uint *y_offset, const char*, nk_flags);
NK_API int nk_group_scrolled_begin(struct nk_context*, struct nk_scroll*, const char *title, nk_flags);
NK_API void nk_group_scrolled_end(struct nk_context*);
NK_API void nk_group_end(struct nk_context*);
/* =============================================================================
 *
 *                                  LIST VIEW
 *
 * ============================================================================= */
struct nk_list_view {
/* public: */
    int begin, end, count;
/* private: */
    int total_height;
    struct nk_context *ctx;
    nk_uint *scroll_pointer;
    nk_uint scroll_value;
};
NK_API int nk_list_view_begin(struct nk_context*, struct nk_list_view *out, const char *id, nk_flags, int row_height, int row_count);
NK_API void nk_list_view_end(struct nk_list_view*);
/* =============================================================================
 *
 *                                  TREE
 *
 * ============================================================================= */
#define nk_tree_push(ctx, type, title, state) nk_tree_push_hashed(ctx, type, title, state, NK_FILE_LINE,nk_strlen(NK_FILE_LINE),__LINE__)
#define nk_tree_push_id(ctx, type, title, state, id) nk_tree_push_hashed(ctx, type, title, state, NK_FILE_LINE,nk_strlen(NK_FILE_LINE),id)
NK_API int nk_tree_push_hashed(struct nk_context*, enum nk_tree_type, const char *title, enum nk_collapse_states initial_state, const char *hash, int len,int seed);
#define nk_tree_image_push(ctx, type, img, title, state) nk_tree_image_push_hashed(ctx, type, img, title, state, NK_FILE_LINE,nk_strlen(NK_FILE_LINE),__LINE__)
#define nk_tree_image_push_id(ctx, type, img, title, state, id) nk_tree_image_push_hashed(ctx, type, img, title, state, NK_FILE_LINE,nk_strlen(NK_FILE_LINE),id)
NK_API int nk_tree_image_push_hashed(struct nk_context*, enum nk_tree_type, struct nk_image, const char *title, enum nk_collapse_states initial_state, const char *hash, int len,int seed);
NK_API void nk_tree_pop(struct nk_context*);
NK_API int nk_tree_state_push(struct nk_context*, enum nk_tree_type, const char *title, enum nk_collapse_states *state);
NK_API int nk_tree_state_image_push(struct nk_context*, enum nk_tree_type, struct nk_image, const char *title, enum nk_collapse_states *state);
NK_API void nk_tree_state_pop(struct nk_context*);
/* =============================================================================
 *
 *                                  WIDGET
 *
 * ============================================================================= */
enum nk_widget_layout_states {
    NK_WIDGET_INVALID, /* The widget cannot be seen and is completely out of view */
    NK_WIDGET_VALID, /* The widget is completely inside the window and can be updated and drawn */
    NK_WIDGET_ROM /* The widget is partially visible and cannot be updated */
};
enum nk_widget_states {
    NK_WIDGET_STATE_MODIFIED    = NK_FLAG(1),
    NK_WIDGET_STATE_INACTIVE    = NK_FLAG(2), /* widget is neither active nor hovered */
    NK_WIDGET_STATE_ENTERED     = NK_FLAG(3), /* widget has been hovered on the current frame */
    NK_WIDGET_STATE_HOVER       = NK_FLAG(4), /* widget is being hovered */
    NK_WIDGET_STATE_ACTIVED     = NK_FLAG(5),/* widget is currently activated */
    NK_WIDGET_STATE_LEFT        = NK_FLAG(6), /* widget is from this frame on not hovered anymore */
    NK_WIDGET_STATE_HOVERED     = NK_WIDGET_STATE_HOVER|NK_WIDGET_STATE_MODIFIED, /* widget is being hovered */
    NK_WIDGET_STATE_ACTIVE      = NK_WIDGET_STATE_ACTIVED|NK_WIDGET_STATE_MODIFIED /* widget is currently activated */
};
NK_API enum nk_widget_layout_states nk_widget(struct nk_rect*, const struct nk_context*);
NK_API enum nk_widget_layout_states nk_widget_fitting(struct nk_rect*, struct nk_context*, struct nk_vec2);
NK_API struct nk_rect nk_widget_bounds(struct nk_context*);
NK_API struct nk_vec2 nk_widget_position(struct nk_context*);
NK_API struct nk_vec2 nk_widget_size(struct nk_context*);
NK_API float nk_widget_width(struct nk_context*);
NK_API float nk_widget_height(struct nk_context*);
NK_API int nk_widget_is_hovered(struct nk_context*);
NK_API int nk_widget_is_mouse_clicked(struct nk_context*, enum nk_buttons);
NK_API int nk_widget_has_mouse_click_down(struct nk_context*, enum nk_buttons, int down);
NK_API void nk_spacing(struct nk_context*, int cols);
/* =============================================================================
 *
 *                                  TEXT
 *
 * ============================================================================= */
enum nk_text_align {
    NK_TEXT_ALIGN_LEFT        = 0x01,
    NK_TEXT_ALIGN_CENTERED    = 0x02,
    NK_TEXT_ALIGN_RIGHT       = 0x04,
    NK_TEXT_ALIGN_TOP         = 0x08,
    NK_TEXT_ALIGN_MIDDLE      = 0x10,
    NK_TEXT_ALIGN_BOTTOM      = 0x20
};
enum nk_text_alignment {
    NK_TEXT_LEFT        = NK_TEXT_ALIGN_MIDDLE|NK_TEXT_ALIGN_LEFT,
    NK_TEXT_CENTERED    = NK_TEXT_ALIGN_MIDDLE|NK_TEXT_ALIGN_CENTERED,
    NK_TEXT_RIGHT       = NK_TEXT_ALIGN_MIDDLE|NK_TEXT_ALIGN_RIGHT
};
NK_API void nk_text(struct nk_context*, const char*, int, nk_flags);
NK_API void nk_text_colored(struct nk_context*, const char*, int, nk_flags, struct nk_color);
NK_API void nk_text_wrap(struct nk_context*, const char*, int);
NK_API void nk_text_wrap_colored(struct nk_context*, const char*, int, struct nk_color);
NK_API void nk_label(struct nk_context*, const char*, nk_flags align);
NK_API void nk_label_colored(struct nk_context*, const char*, nk_flags align, struct nk_color);
NK_API void nk_label_wrap(struct nk_context*, const char*);
NK_API void nk_label_colored_wrap(struct nk_context*, const char*, struct nk_color);
NK_API void nk_image(struct nk_context*, struct nk_image);
#ifdef NK_INCLUDE_STANDARD_VARARGS
NK_API void nk_labelf(struct nk_context*, nk_flags, const char*, ...);
NK_API void nk_labelf_colored(struct nk_context*, nk_flags align, struct nk_color, const char*,...);
NK_API void nk_labelf_wrap(struct nk_context*, const char*,...);
NK_API void nk_labelf_colored_wrap(struct nk_context*, struct nk_color, const char*,...);
NK_API void nk_value_bool(struct nk_context*, const char *prefix, int);
NK_API void nk_value_int(struct nk_context*, const char *prefix, int);
NK_API void nk_value_uint(struct nk_context*, const char *prefix, unsigned int);
NK_API void nk_value_float(struct nk_context*, const char *prefix, float);
NK_API void nk_value_color_byte(struct nk_context*, const char *prefix, struct nk_color);
NK_API void nk_value_color_float(struct nk_context*, const char *prefix, struct nk_color);
NK_API void nk_value_color_hex(struct nk_context*, const char *prefix, struct nk_color);
#endif
/* =============================================================================
 *
 *                                  BUTTON
 *
 * ============================================================================= */
NK_API int nk_button_text(struct nk_context*, const char *title, int len);
NK_API int nk_button_label(struct nk_context*, const char *title);
NK_API int nk_button_color(struct nk_context*, struct nk_color);
NK_API int nk_button_symbol(struct nk_context*, enum nk_symbol_type);
NK_API int nk_button_image(struct nk_context*, struct nk_image img);
NK_API int nk_button_symbol_label(struct nk_context*, enum nk_symbol_type, const char*, nk_flags text_alignment);
NK_API int nk_button_symbol_text(struct nk_context*, enum nk_symbol_type, const char*, int, nk_flags alignment);
NK_API int nk_button_image_label(struct nk_context*, struct nk_image img, const char*, nk_flags text_alignment);
NK_API int nk_button_image_text(struct nk_context*, struct nk_image img, const char*, int, nk_flags alignment);
NK_API int nk_button_text_styled(struct nk_context*, const struct nk_style_button*, const char *title, int len);
NK_API int nk_button_label_styled(struct nk_context*, const struct nk_style_button*, const char *title);
NK_API int nk_button_symbol_styled(struct nk_context*, const struct nk_style_button*, enum nk_symbol_type);
NK_API int nk_button_image_styled(struct nk_context*, const struct nk_style_button*, struct nk_image img);
NK_API int nk_button_symbol_text_styled(struct nk_context*,const struct nk_style_button*, enum nk_symbol_type, const char*, int, nk_flags alignment);
NK_API int nk_button_symbol_label_styled(struct nk_context *ctx, const struct nk_style_button *style, enum nk_symbol_type symbol, const char *title, nk_flags align);
NK_API int nk_button_image_label_styled(struct nk_context*,const struct nk_style_button*, struct nk_image img, const char*, nk_flags text_alignment);
NK_API int nk_button_image_text_styled(struct nk_context*,const struct nk_style_button*, struct nk_image img, const char*, int, nk_flags alignment);
NK_API void nk_button_set_behavior(struct nk_context*, enum nk_button_behavior);
NK_API int nk_button_push_behavior(struct nk_context*, enum nk_button_behavior);
NK_API int nk_button_pop_behavior(struct nk_context*);
/* =============================================================================
 *
 *                                  CHECKBOX
 *
 * ============================================================================= */
NK_API int nk_check_label(struct nk_context*, const char*, int active);
NK_API int nk_check_text(struct nk_context*, const char*, int,int active);
NK_API unsigned nk_check_flags_label(struct nk_context*, const char*, unsigned int flags, unsigned int value);
NK_API unsigned nk_check_flags_text(struct nk_context*, const char*, int, unsigned int flags, unsigned int value);
NK_API int nk_checkbox_label(struct nk_context*, const char*, int *active);
NK_API int nk_checkbox_text(struct nk_context*, const char*, int, int *active);
NK_API int nk_checkbox_flags_label(struct nk_context*, const char*, unsigned int *flags, unsigned int value);
NK_API int nk_checkbox_flags_text(struct nk_context*, const char*, int, unsigned int *flags, unsigned int value);
/* =============================================================================
 *
 *                                  RADIO BUTTON
 *
 * ============================================================================= */
NK_API int nk_radio_label(struct nk_context*, const char*, int *active);
NK_API int nk_radio_text(struct nk_context*, const char*, int, int *active);
NK_API int nk_option_label(struct nk_context*, const char*, int active);
NK_API int nk_option_text(struct nk_context*, const char*, int, int active);
/* =============================================================================
 *
 *                                  SELECTABLE
 *
 * ============================================================================= */
NK_API int nk_selectable_label(struct nk_context*, const char*, nk_flags align, int *value);
NK_API int nk_selectable_text(struct nk_context*, const char*, int, nk_flags align, int *value);
NK_API int nk_selectable_image_label(struct nk_context*,struct nk_image,  const char*, nk_flags align, int *value);
NK_API int nk_selectable_image_text(struct nk_context*,struct nk_image, const char*, int, nk_flags align, int *value);
NK_API int nk_select_label(struct nk_context*, const char*, nk_flags align, int value);
NK_API int nk_select_text(struct nk_context*, const char*, int, nk_flags align, int value);
NK_API int nk_select_image_label(struct nk_context*, struct nk_image,const char*, nk_flags align, int value);
NK_API int nk_select_image_text(struct nk_context*, struct nk_image,const char*, int, nk_flags align, int value);
/* =============================================================================
 *
 *                                  SLIDER
 *
 * ============================================================================= */
NK_API float nk_slide_float(struct nk_context*, float min, float val, float max, float step);
NK_API int nk_slide_int(struct nk_context*, int min, int val, int max, int step);
NK_API int nk_slider_float(struct nk_context*, float min, float *val, float max, float step);
NK_API int nk_slider_int(struct nk_context*, int min, int *val, int max, int step);
/* =============================================================================
 *
 *                                  PROGRESSBAR
 *
 * ============================================================================= */
NK_API int nk_progress(struct nk_context*, nk_size *cur, nk_size max, int modifyable);
NK_API nk_size nk_prog(struct nk_context*, nk_size cur, nk_size max, int modifyable);

/* =============================================================================
 *
 *                                  COLOR PICKER
 *
 * ============================================================================= */
NK_API struct nk_color nk_color_picker(struct nk_context*, struct nk_color, enum nk_color_format);
NK_API int nk_color_pick(struct nk_context*, struct nk_color*, enum nk_color_format);
/* =============================================================================
 *
 *                                  PROPERTIES
 *
 * ============================================================================= */
NK_API void nk_property_int(struct nk_context*, const char *name, int min, int *val, int max, int step, float inc_per_pixel);
NK_API void nk_property_float(struct nk_context*, const char *name, float min, float *val, float max, float step, float inc_per_pixel);
NK_API void nk_property_double(struct nk_context*, const char *name, double min, double *val, double max, double step, float inc_per_pixel);
NK_API int nk_propertyi(struct nk_context*, const char *name, int min, int val, int max, int step, float inc_per_pixel);
NK_API float nk_propertyf(struct nk_context*, const char *name, float min, float val, float max, float step, float inc_per_pixel);
NK_API double nk_propertyd(struct nk_context*, const char *name, double min, double val, double max, double step, float inc_per_pixel);
/* =============================================================================
 *
 *                                  TEXT EDIT
 *
 * ============================================================================= */
enum nk_edit_flags {
    NK_EDIT_DEFAULT                 = 0,
    NK_EDIT_READ_ONLY               = NK_FLAG(0),
    NK_EDIT_AUTO_SELECT             = NK_FLAG(1),
    NK_EDIT_SIG_ENTER               = NK_FLAG(2),
    NK_EDIT_ALLOW_TAB               = NK_FLAG(3),
    NK_EDIT_NO_CURSOR               = NK_FLAG(4),
    NK_EDIT_SELECTABLE              = NK_FLAG(5),
    NK_EDIT_CLIPBOARD               = NK_FLAG(6),
    NK_EDIT_CTRL_ENTER_NEWLINE      = NK_FLAG(7),
    NK_EDIT_NO_HORIZONTAL_SCROLL    = NK_FLAG(8),
    NK_EDIT_ALWAYS_INSERT_MODE      = NK_FLAG(9),
    NK_EDIT_MULTILINE               = NK_FLAG(10),
    NK_EDIT_GOTO_END_ON_ACTIVATE    = NK_FLAG(11)
};
enum nk_edit_types {
    NK_EDIT_SIMPLE  = NK_EDIT_ALWAYS_INSERT_MODE,
    NK_EDIT_FIELD   = NK_EDIT_SIMPLE|NK_EDIT_SELECTABLE|NK_EDIT_CLIPBOARD,
    NK_EDIT_BOX     = NK_EDIT_ALWAYS_INSERT_MODE| NK_EDIT_SELECTABLE| NK_EDIT_MULTILINE|NK_EDIT_ALLOW_TAB|NK_EDIT_CLIPBOARD,
    NK_EDIT_EDITOR  = NK_EDIT_SELECTABLE|NK_EDIT_MULTILINE|NK_EDIT_ALLOW_TAB| NK_EDIT_CLIPBOARD
};
enum nk_edit_events {
    NK_EDIT_ACTIVE      = NK_FLAG(0), /* edit widget is currently being modified */
    NK_EDIT_INACTIVE    = NK_FLAG(1), /* edit widget is not active and is not being modified */
    NK_EDIT_ACTIVATED   = NK_FLAG(2), /* edit widget went from state inactive to state active */
    NK_EDIT_DEACTIVATED = NK_FLAG(3), /* edit widget went from state active to state inactive */
    NK_EDIT_COMMITED    = NK_FLAG(4) /* edit widget has received an enter and lost focus */
};
NK_API nk_flags nk_edit_string(struct nk_context*, nk_flags, char *buffer, int *len, int max, nk_plugin_filter);
NK_API nk_flags nk_edit_string_zero_terminated(struct nk_context*, nk_flags, char *buffer, int max, nk_plugin_filter);
NK_API nk_flags nk_edit_buffer(struct nk_context*, nk_flags, struct nk_text_edit*, nk_plugin_filter);
NK_API void nk_edit_focus(struct nk_context*, nk_flags flags);
NK_API void nk_edit_unfocus(struct nk_context*);
/* =============================================================================
 *
 *                                  CHART
 *
 * ============================================================================= */
NK_API int nk_chart_begin(struct nk_context*, enum nk_chart_type, int num, float min, float max);
NK_API int nk_chart_begin_colored(struct nk_context*, enum nk_chart_type, struct nk_color, struct nk_color active, int num, float min, float max);
NK_API void nk_chart_add_slot(struct nk_context *ctx, const enum nk_chart_type, int count, float min_value, float max_value);
NK_API void nk_chart_add_slot_colored(struct nk_context *ctx, const enum nk_chart_type, struct nk_color, struct nk_color active, int count, float min_value, float max_value);
NK_API nk_flags nk_chart_push(struct nk_context*, float);
NK_API nk_flags nk_chart_push_slot(struct nk_context*, float, int);
NK_API void nk_chart_end(struct nk_context*);
NK_API void nk_plot(struct nk_context*, enum nk_chart_type, const float *values, int count, int offset);
NK_API void nk_plot_function(struct nk_context*, enum nk_chart_type, void *userdata, float(*value_getter)(void* user, int index), int count, int offset);
/* =============================================================================
 *
 *                                  POPUP
 *
 * ============================================================================= */
NK_API int nk_popup_begin(struct nk_context*, enum nk_popup_type, const char*, nk_flags, struct nk_rect bounds);
NK_API void nk_popup_close(struct nk_context*);
NK_API void nk_popup_end(struct nk_context*);
/* =============================================================================
 *
 *                                  COMBOBOX
 *
 * ============================================================================= */
NK_API int nk_combo(struct nk_context*, const char **items, int count, int selected, int item_height, struct nk_vec2 size);
NK_API int nk_combo_separator(struct nk_context*, const char *items_separated_by_separator, int separator, int selected, int count, int item_height, struct nk_vec2 size);
NK_API int nk_combo_string(struct nk_context*, const char *items_separated_by_zeros, int selected, int count, int item_height, struct nk_vec2 size);
NK_API int nk_combo_callback(struct nk_context*, void(*item_getter)(void*, int, const char**), void *userdata, int selected, int count, int item_height, struct nk_vec2 size);
NK_API void nk_combobox(struct nk_context*, const char **items, int count, int *selected, int item_height, struct nk_vec2 size);
NK_API void nk_combobox_string(struct nk_context*, const char *items_separated_by_zeros, int *selected, int count, int item_height, struct nk_vec2 size);
NK_API void nk_combobox_separator(struct nk_context*, const char *items_separated_by_separator, int separator,int *selected, int count, int item_height, struct nk_vec2 size);
NK_API void nk_combobox_callback(struct nk_context*, void(*item_getter)(void*, int, const char**), void*, int *selected, int count, int item_height, struct nk_vec2 size);
/* =============================================================================
 *
 *                                  ABSTRACT COMBOBOX
 *
 * ============================================================================= */
NK_API int nk_combo_begin_text(struct nk_context*, const char *selected, int, struct nk_vec2 size);
NK_API int nk_combo_begin_label(struct nk_context*, const char *selected, struct nk_vec2 size);
NK_API int nk_combo_begin_color(struct nk_context*, struct nk_color color, struct nk_vec2 size);
NK_API int nk_combo_begin_symbol(struct nk_context*,  enum nk_symbol_type,  struct nk_vec2 size);
NK_API int nk_combo_begin_symbol_label(struct nk_context*, const char *selected, enum nk_symbol_type, struct nk_vec2 size);
NK_API int nk_combo_begin_symbol_text(struct nk_context*, const char *selected, int, enum nk_symbol_type, struct nk_vec2 size);
NK_API int nk_combo_begin_image(struct nk_context*, struct nk_image img,  struct nk_vec2 size);
NK_API int nk_combo_begin_image_label(struct nk_context*, const char *selected, struct nk_image, struct nk_vec2 size);
NK_API int nk_combo_begin_image_text(struct nk_context*,  const char *selected, int, struct nk_image, struct nk_vec2 size);
NK_API int nk_combo_item_label(struct nk_context*, const char*, nk_flags alignment);
NK_API int nk_combo_item_text(struct nk_context*, const char*,int, nk_flags alignment);
NK_API int nk_combo_item_image_label(struct nk_context*, struct nk_image, const char*, nk_flags alignment);
NK_API int nk_combo_item_image_text(struct nk_context*, struct nk_image, const char*, int,nk_flags alignment);
NK_API int nk_combo_item_symbol_label(struct nk_context*, enum nk_symbol_type, const char*, nk_flags alignment);
NK_API int nk_combo_item_symbol_text(struct nk_context*, enum nk_symbol_type, const char*, int, nk_flags alignment);
NK_API void nk_combo_close(struct nk_context*);
NK_API void nk_combo_end(struct nk_context*);
/* =============================================================================
 *
 *                                  CONTEXTUAL
 *
 * ============================================================================= */
NK_API int nk_contextual_begin(struct nk_context*, nk_flags, struct nk_vec2, struct nk_rect trigger_bounds);
NK_API int nk_contextual_item_text(struct nk_context*, const char*, int,nk_flags align);
NK_API int nk_contextual_item_label(struct nk_context*, const char*, nk_flags align);
NK_API int nk_contextual_item_image_label(struct nk_context*, struct nk_image, const char*, nk_flags alignment);
NK_API int nk_contextual_item_image_text(struct nk_context*, struct nk_image, const char*, int len, nk_flags alignment);
NK_API int nk_contextual_item_symbol_label(struct nk_context*, enum nk_symbol_type, const char*, nk_flags alignment);
NK_API int nk_contextual_item_symbol_text(struct nk_context*, enum nk_symbol_type, const char*, int, nk_flags alignment);
NK_API void nk_contextual_close(struct nk_context*);
NK_API void nk_contextual_end(struct nk_context*);
/* =============================================================================
 *
 *                                  TOOLTIP
 *
 * ============================================================================= */
NK_API void nk_tooltip(struct nk_context*, const char*);
NK_API int nk_tooltip_begin(struct nk_context*, float width);
NK_API void nk_tooltip_end(struct nk_context*);
/* =============================================================================
 *
 *                                  MENU
 *
 * ============================================================================= */
NK_API void nk_menubar_begin(struct nk_context*);
NK_API void nk_menubar_end(struct nk_context*);
NK_API int nk_menu_begin_text(struct nk_context*, const char* title, int title_len, nk_flags align, struct nk_vec2 size);
NK_API int nk_menu_begin_label(struct nk_context*, const char*, nk_flags align, struct nk_vec2 size);
NK_API int nk_menu_begin_image(struct nk_context*, const char*, struct nk_image, struct nk_vec2 size);
NK_API int nk_menu_begin_image_text(struct nk_context*, const char*, int,nk_flags align,struct nk_image, struct nk_vec2 size);
NK_API int nk_menu_begin_image_label(struct nk_context*, const char*, nk_flags align,struct nk_image, struct nk_vec2 size);
NK_API int nk_menu_begin_symbol(struct nk_context*, const char*, enum nk_symbol_type, struct nk_vec2 size);
NK_API int nk_menu_begin_symbol_text(struct nk_context*, const char*, int,nk_flags align,enum nk_symbol_type, struct nk_vec2 size);
NK_API int nk_menu_begin_symbol_label(struct nk_context*, const char*, nk_flags align,enum nk_symbol_type, struct nk_vec2 size);
NK_API int nk_menu_item_text(struct nk_context*, const char*, int,nk_flags align);
NK_API int nk_menu_item_label(struct nk_context*, const char*, nk_flags alignment);
NK_API int nk_menu_item_image_label(struct nk_context*, struct nk_image, const char*, nk_flags alignment);
NK_API int nk_menu_item_image_text(struct nk_context*, struct nk_image, const char*, int len, nk_flags alignment);
NK_API int nk_menu_item_symbol_text(struct nk_context*, enum nk_symbol_type, const char*, int, nk_flags alignment);
NK_API int nk_menu_item_symbol_label(struct nk_context*, enum nk_symbol_type, const char*, nk_flags alignment);
NK_API void nk_menu_close(struct nk_context*);
NK_API void nk_menu_end(struct nk_context*);
/* =============================================================================
 *
 *                                  STYLE
 *
 * ============================================================================= */
enum nk_style_colors {
    NK_COLOR_TEXT,
    NK_COLOR_WINDOW,
    NK_COLOR_HEADER,
    NK_COLOR_BORDER,
    NK_COLOR_BUTTON,
    NK_COLOR_BUTTON_HOVER,
    NK_COLOR_BUTTON_ACTIVE,
    NK_COLOR_TOGGLE,
    NK_COLOR_TOGGLE_HOVER,
    NK_COLOR_TOGGLE_CURSOR,
    NK_COLOR_SELECT,
    NK_COLOR_SELECT_ACTIVE,
    NK_COLOR_SLIDER,
    NK_COLOR_SLIDER_CURSOR,
    NK_COLOR_SLIDER_CURSOR_HOVER,
    NK_COLOR_SLIDER_CURSOR_ACTIVE,
    NK_COLOR_PROPERTY,
    NK_COLOR_EDIT,
    NK_COLOR_EDIT_CURSOR,
    NK_COLOR_COMBO,
    NK_COLOR_CHART,
    NK_COLOR_CHART_COLOR,
    NK_COLOR_CHART_COLOR_HIGHLIGHT,
    NK_COLOR_SCROLLBAR,
    NK_COLOR_SCROLLBAR_CURSOR,
    NK_COLOR_SCROLLBAR_CURSOR_HOVER,
    NK_COLOR_SCROLLBAR_CURSOR_ACTIVE,
    NK_COLOR_TAB_HEADER,
    NK_COLOR_COUNT
};
enum nk_style_cursor {
    NK_CURSOR_ARROW,
    NK_CURSOR_TEXT,
    NK_CURSOR_MOVE,
    NK_CURSOR_RESIZE_VERTICAL,
    NK_CURSOR_RESIZE_HORIZONTAL,
    NK_CURSOR_RESIZE_TOP_LEFT_DOWN_RIGHT,
    NK_CURSOR_RESIZE_TOP_RIGHT_DOWN_LEFT,
    NK_CURSOR_COUNT
};
NK_API void nk_style_default(struct nk_context*);
NK_API void nk_style_from_table(struct nk_context*, const struct nk_color*);
NK_API void nk_style_load_cursor(struct nk_context*, enum nk_style_cursor, const struct nk_cursor*);
NK_API void nk_style_load_all_cursors(struct nk_context*, struct nk_cursor*);
NK_API const char* nk_style_get_color_by_name(enum nk_style_colors);
NK_API void nk_style_set_font(struct nk_context*, const struct nk_user_font*);
NK_API int nk_style_set_cursor(struct nk_context*, enum nk_style_cursor);
NK_API void nk_style_show_cursor(struct nk_context*);
NK_API void nk_style_hide_cursor(struct nk_context*);

NK_API int nk_style_push_font(struct nk_context*, const struct nk_user_font*);
NK_API int nk_style_push_float(struct nk_context*, float*, float);
NK_API int nk_style_push_vec2(struct nk_context*, struct nk_vec2*, struct nk_vec2);
NK_API int nk_style_push_style_item(struct nk_context*, struct nk_style_item*, struct nk_style_item);
NK_API int nk_style_push_flags(struct nk_context*, nk_flags*, nk_flags);
NK_API int nk_style_push_color(struct nk_context*, struct nk_color*, struct nk_color);

NK_API int nk_style_pop_font(struct nk_context*);
NK_API int nk_style_pop_float(struct nk_context*);
NK_API int nk_style_pop_vec2(struct nk_context*);
NK_API int nk_style_pop_style_item(struct nk_context*);
NK_API int nk_style_pop_flags(struct nk_context*);
NK_API int nk_style_pop_color(struct nk_context*);
/* =============================================================================
 *
 *                                  COLOR
 *
 * ============================================================================= */
NK_API struct nk_color nk_rgb(int r, int g, int b);
NK_API struct nk_color nk_rgb_iv(const int *rgb);
NK_API struct nk_color nk_rgb_bv(const nk_byte* rgb);
NK_API struct nk_color nk_rgb_f(float r, float g, float b);
NK_API struct nk_color nk_rgb_fv(const float *rgb);
NK_API struct nk_color nk_rgb_hex(const char *rgb);

NK_API struct nk_color nk_rgba(int r, int g, int b, int a);
NK_API struct nk_color nk_rgba_u32(nk_uint);
NK_API struct nk_color nk_rgba_iv(const int *rgba);
NK_API struct nk_color nk_rgba_bv(const nk_byte *rgba);
NK_API struct nk_color nk_rgba_f(float r, float g, float b, float a);
NK_API struct nk_color nk_rgba_fv(const float *rgba);
NK_API struct nk_color nk_rgba_hex(const char *rgb);

NK_API struct nk_color nk_hsv(int h, int s, int v);
NK_API struct nk_color nk_hsv_iv(const int *hsv);
NK_API struct nk_color nk_hsv_bv(const nk_byte *hsv);
NK_API struct nk_color nk_hsv_f(float h, float s, float v);
NK_API struct nk_color nk_hsv_fv(const float *hsv);

NK_API struct nk_color nk_hsva(int h, int s, int v, int a);
NK_API struct nk_color nk_hsva_iv(const int *hsva);
NK_API struct nk_color nk_hsva_bv(const nk_byte *hsva);
NK_API struct nk_color nk_hsva_f(float h, float s, float v, float a);
NK_API struct nk_color nk_hsva_fv(const float *hsva);

/* color (conversion nuklear --> user) */
NK_API void nk_color_f(float *r, float *g, float *b, float *a, struct nk_color);
NK_API void nk_color_fv(float *rgba_out, struct nk_color);
NK_API void nk_color_d(double *r, double *g, double *b, double *a, struct nk_color);
NK_API void nk_color_dv(double *rgba_out, struct nk_color);

NK_API nk_uint nk_color_u32(struct nk_color);
NK_API void nk_color_hex_rgba(char *output, struct nk_color);
NK_API void nk_color_hex_rgb(char *output, struct nk_color);

NK_API void nk_color_hsv_i(int *out_h, int *out_s, int *out_v, struct nk_color);
NK_API void nk_color_hsv_b(nk_byte *out_h, nk_byte *out_s, nk_byte *out_v, struct nk_color);
NK_API void nk_color_hsv_iv(int *hsv_out, struct nk_color);
NK_API void nk_color_hsv_bv(nk_byte *hsv_out, struct nk_color);
NK_API void nk_color_hsv_f(float *out_h, float *out_s, float *out_v, struct nk_color);
NK_API void nk_color_hsv_fv(float *hsv_out, struct nk_color);

NK_API void nk_color_hsva_i(int *h, int *s, int *v, int *a, struct nk_color);
NK_API void nk_color_hsva_b(nk_byte *h, nk_byte *s, nk_byte *v, nk_byte *a, struct nk_color);
NK_API void nk_color_hsva_iv(int *hsva_out, struct nk_color);
NK_API void nk_color_hsva_bv(nk_byte *hsva_out, struct nk_color);
NK_API void nk_color_hsva_f(float *out_h, float *out_s, float *out_v, float *out_a, struct nk_color);
NK_API void nk_color_hsva_fv(float *hsva_out, struct nk_color);
/* =============================================================================
 *
 *                                  IMAGE
 *
 * ============================================================================= */
NK_API nk_handle nk_handle_ptr(void*);
NK_API nk_handle nk_handle_id(int);
NK_API struct nk_image nk_image_handle(nk_handle);
NK_API struct nk_image nk_image_ptr(void*);
NK_API struct nk_image nk_image_id(int);
NK_API int nk_image_is_subimage(const struct nk_image* img);
NK_API struct nk_image nk_subimage_ptr(void*, unsigned short w, unsigned short h, struct nk_rect sub_region);
NK_API struct nk_image nk_subimage_id(int, unsigned short w, unsigned short h, struct nk_rect sub_region);
NK_API struct nk_image nk_subimage_handle(nk_handle, unsigned short w, unsigned short h, struct nk_rect sub_region);
/* =============================================================================
 *
 *                                  MATH
 *
 * ============================================================================= */
NK_API nk_hash nk_murmur_hash(const void *key, int len, nk_hash seed);
NK_API void nk_triangle_from_direction(struct nk_vec2 *result, struct nk_rect r, float pad_x, float pad_y, enum nk_heading);

NK_API struct nk_vec2 nk_vec2(float x, float y);
NK_API struct nk_vec2 nk_vec2i(int x, int y);
NK_API struct nk_vec2 nk_vec2v(const float *xy);
NK_API struct nk_vec2 nk_vec2iv(const int *xy);

NK_API struct nk_rect nk_get_null_rect(void);
NK_API struct nk_rect nk_rect(float x, float y, float w, float h);
NK_API struct nk_rect nk_recti(int x, int y, int w, int h);
NK_API struct nk_rect nk_recta(struct nk_vec2 pos, struct nk_vec2 size);
NK_API struct nk_rect nk_rectv(const float *xywh);
NK_API struct nk_rect nk_rectiv(const int *xywh);
NK_API struct nk_vec2 nk_rect_pos(struct nk_rect);
NK_API struct nk_vec2 nk_rect_size(struct nk_rect);
/* =============================================================================
 *
 *                                  STRING
 *
 * ============================================================================= */
NK_API int nk_strlen(const char *str);
NK_API int nk_stricmp(const char *s1, const char *s2);
NK_API int nk_stricmpn(const char *s1, const char *s2, int n);
NK_API int nk_strtoi(const char *str, const char **endptr);
NK_API float nk_strtof(const char *str, const char **endptr);
NK_API double nk_strtod(const char *str, const char **endptr);
NK_API int nk_strfilter(const char *text, const char *regexp);
NK_API int nk_strmatch_fuzzy_string(char const *str, char const *pattern, int *out_score);
NK_API int nk_strmatch_fuzzy_text(const char *txt, int txt_len, const char *pattern, int *out_score);
/* =============================================================================
 *
 *                                  UTF-8
 *
 * ============================================================================= */
NK_API int nk_utf_decode(const char*, nk_rune*, int);
NK_API int nk_utf_encode(nk_rune, char*, int);
NK_API int nk_utf_len(const char*, int byte_len);
NK_API const char* nk_utf_at(const char *buffer, int length, int index, nk_rune *unicode, int *len);
/* ===============================================================
 *
 *                          FONT
 *
 * ===============================================================*/
/*  Font handling in this library was designed to be quite customizable and lets
    you decide what you want to use and what you want to provide. There are three
    different ways to use the font atlas. The first two will use your font
    handling scheme and only requires essential data to run nuklear. The next
    slightly more advanced features is font handling with vertex buffer output.
    Finally the most complex API wise is using nuklear's font baking API.

    1.) Using your own implementation without vertex buffer output
    --------------------------------------------------------------
    So first up the easiest way to do font handling is by just providing a
    `nk_user_font` struct which only requires the height in pixel of the used
    font and a callback to calculate the width of a string. This way of handling
    fonts is best fitted for using the normal draw shape command API where you
    do all the text drawing yourself and the library does not require any kind
    of deeper knowledge about which font handling mechanism you use.
    IMPORTANT: the `nk_user_font` pointer provided to nuklear has to persist
    over the complete life time! I know this sucks but it is currently the only
    way to switch between fonts.

        float your_text_width_calculation(nk_handle handle, float height, const char *text, int len)
        {
            your_font_type *type = handle.ptr;
            float text_width = ...;
            return text_width;
        }

        struct nk_user_font font;
        font.userdata.ptr = &your_font_class_or_struct;
        font.height = your_font_height;
        font.width = your_text_width_calculation;

        struct nk_context ctx;
        nk_init_default(&ctx, &font);

    2.) Using your own implementation with vertex buffer output
    --------------------------------------------------------------
    While the first approach works fine if you don't want to use the optional
    vertex buffer output it is not enough if you do. To get font handling working
    for these cases you have to provide two additional parameters inside the
    `nk_user_font`. First a texture atlas handle used to draw text as subimages
    of a bigger font atlas texture and a callback to query a character's glyph
    information (offset, size, ...). So it is still possible to provide your own
    font and use the vertex buffer output.

        float your_text_width_calculation(nk_handle handle, float height, const char *text, int len)
        {
            your_font_type *type = handle.ptr;
            float text_width = ...;
            return text_width;
        }
        void query_your_font_glyph(nk_handle handle, float font_height, struct nk_user_font_glyph *glyph, nk_rune codepoint, nk_rune next_codepoint)
        {
            your_font_type *type = handle.ptr;
            glyph.width = ...;
            glyph.height = ...;
            glyph.xadvance = ...;
            glyph.uv[0].x = ...;
            glyph.uv[0].y = ...;
            glyph.uv[1].x = ...;
            glyph.uv[1].y = ...;
            glyph.offset.x = ...;
            glyph.offset.y = ...;
        }

        struct nk_user_font font;
        font.userdata.ptr = &your_font_class_or_struct;
        font.height = your_font_height;
        font.width = your_text_width_calculation;
        font.query = query_your_font_glyph;
        font.texture.id = your_font_texture;

        struct nk_context ctx;
        nk_init_default(&ctx, &font);

    3.) Nuklear font baker
    ------------------------------------
    The final approach if you do not have a font handling functionality or don't
    want to use it in this library is by using the optional font baker.
    The font baker APIs can be used to create a font plus font atlas texture
    and can be used with or without the vertex buffer output.

    It still uses the `nk_user_font` struct and the two different approaches
    previously stated still work. The font baker is not located inside
    `nk_context` like all other systems since it can be understood as more of
    an extension to nuklear and does not really depend on any `nk_context` state.

    Font baker need to be initialized first by one of the nk_font_atlas_init_xxx
    functions. If you don't care about memory just call the default version
    `nk_font_atlas_init_default` which will allocate all memory from the standard library.
    If you want to control memory allocation but you don't care if the allocated
    memory is temporary and therefore can be freed directly after the baking process
    is over or permanent you can call `nk_font_atlas_init`.

    After successfully initializing the font baker you can add Truetype(.ttf) fonts from
    different sources like memory or from file by calling one of the `nk_font_atlas_add_xxx`.
    functions. Adding font will permanently store each font, font config and ttf memory block(!)
    inside the font atlas and allows to reuse the font atlas. If you don't want to reuse
    the font baker by for example adding additional fonts you can call
    `nk_font_atlas_cleanup` after the baking process is over (after calling nk_font_atlas_end).

    As soon as you added all fonts you wanted you can now start the baking process
    for every selected glyph to image by calling `nk_font_atlas_bake`.
    The baking process returns image memory, width and height which can be used to
    either create your own image object or upload it to any graphics library.
    No matter which case you finally have to call `nk_font_atlas_end` which
    will free all temporary memory including the font atlas image so make sure
    you created our texture beforehand. `nk_font_atlas_end` requires a handle
    to your font texture or object and optionally fills a `struct nk_draw_null_texture`
    which can be used for the optional vertex output. If you don't want it just
    set the argument to `NULL`.

    At this point you are done and if you don't want to reuse the font atlas you
    can call `nk_font_atlas_cleanup` to free all truetype blobs and configuration
    memory. Finally if you don't use the font atlas and any of it's fonts anymore
    you need to call `nk_font_atlas_clear` to free all memory still being used.

        struct nk_font_atlas atlas;
        nk_font_atlas_init_default(&atlas);
        nk_font_atlas_begin(&atlas);
        nk_font *font = nk_font_atlas_add_from_file(&atlas, "Path/To/Your/TTF_Font.ttf", 13, 0);
        nk_font *font2 = nk_font_atlas_add_from_file(&atlas, "Path/To/Your/TTF_Font2.ttf", 16, 0);
        const void* img = nk_font_atlas_bake(&atlas, &img_width, &img_height, NK_FONT_ATLAS_RGBA32);
        nk_font_atlas_end(&atlas, nk_handle_id(texture), 0);

        struct nk_context ctx;
        nk_init_default(&ctx, &font->handle);
        while (1) {

        }
        nk_font_atlas_clear(&atlas);

    The font baker API is probably the most complex API inside this library and
    I would suggest reading some of my examples `example/` to get a grip on how
    to use the font atlas. There are a number of details I left out. For example
    how to merge fonts, configure a font with `nk_font_config` to use other languages,
    use another texture coordinate format and a lot more:

        struct nk_font_config cfg = nk_font_config(font_pixel_height);
        cfg.merge_mode = nk_false or nk_true;
        cfg.range = nk_font_korean_glyph_ranges();
        cfg.coord_type = NK_COORD_PIXEL;
        nk_font *font = nk_font_atlas_add_from_file(&atlas, "Path/To/Your/TTF_Font.ttf", 13, &cfg);

*/
struct nk_user_font_glyph;
typedef float(*nk_text_width_f)(nk_handle, float h, const char*, int len);
typedef void(*nk_query_font_glyph_f)(nk_handle handle, float font_height,
                                    struct nk_user_font_glyph *glyph,
                                    nk_rune codepoint, nk_rune next_codepoint);

#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
struct nk_user_font_glyph {
    struct nk_vec2 uv[2];
    /* texture coordinates */
    struct nk_vec2 offset;
    /* offset between top left and glyph */
    float width, height;
    /* size of the glyph  */
    float xadvance;
    /* offset to the next glyph */
};
#endif

struct nk_user_font {
    nk_handle userdata;
    /* user provided font handle */
    float height;
    /* max height of the font */
    nk_text_width_f width;
    /* font string width in pixel callback */
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
    nk_query_font_glyph_f query;
    /* font glyph callback to query drawing info */
    nk_handle texture;
    /* texture handle to the used font atlas or texture */
#endif
};

#ifdef NK_INCLUDE_FONT_BAKING
enum nk_font_coord_type {
    NK_COORD_UV, /* texture coordinates inside font glyphs are clamped between 0-1 */
    NK_COORD_PIXEL /* texture coordinates inside font glyphs are in absolute pixel */
};

struct nk_baked_font {
    float height;
    /* height of the font  */
    float ascent, descent;
    /* font glyphs ascent and descent  */
    nk_rune glyph_offset;
    /* glyph array offset inside the font glyph baking output array  */
    nk_rune glyph_count;
    /* number of glyphs of this font inside the glyph baking array output */
    const nk_rune *ranges;
    /* font codepoint ranges as pairs of (from/to) and 0 as last element */
};

struct nk_font_config {
    struct nk_font_config *next;
    /* NOTE: only used internally */
    void *ttf_blob;
    /* pointer to loaded TTF file memory block.
     * NOTE: not needed for nk_font_atlas_add_from_memory and nk_font_atlas_add_from_file. */
    nk_size ttf_size;
    /* size of the loaded TTF file memory block
     * NOTE: not needed for nk_font_atlas_add_from_memory and nk_font_atlas_add_from_file. */

    unsigned char ttf_data_owned_by_atlas;
    /* used inside font atlas: default to: 0*/
    unsigned char merge_mode;
    /* merges this font into the last font */
    unsigned char pixel_snap;
    /* align every character to pixel boundary (if true set oversample (1,1)) */
    unsigned char oversample_v, oversample_h;
    /* rasterize at hight quality for sub-pixel position */
    unsigned char padding[3];

    float size;
    /* baked pixel height of the font */
    enum nk_font_coord_type coord_type;
    /* texture coordinate format with either pixel or UV coordinates */
    struct nk_vec2 spacing;
    /* extra pixel spacing between glyphs  */
    const nk_rune *range;
    /* list of unicode ranges (2 values per range, zero terminated) */
    struct nk_baked_font *font;
    /* font to setup in the baking process: NOTE: not needed for font atlas */
    nk_rune fallback_glyph;
    /* fallback glyph to use if a given rune is not found */
};

struct nk_font_glyph {
    nk_rune codepoint;
    float xadvance;
    float x0, y0, x1, y1, w, h;
    float u0, v0, u1, v1;
};

struct nk_font {
    struct nk_font *next;
    struct nk_user_font handle;
    struct nk_baked_font info;
    float scale;
    struct nk_font_glyph *glyphs;
    const struct nk_font_glyph *fallback;
    nk_rune fallback_codepoint;
    nk_handle texture;
    struct nk_font_config *config;
};

enum nk_font_atlas_format {
    NK_FONT_ATLAS_ALPHA8,
    NK_FONT_ATLAS_RGBA32
};

struct nk_font_atlas {
    void *pixel;
    int tex_width;
    int tex_height;

    struct nk_allocator permanent;
    struct nk_allocator temporary;

    struct nk_recti custom;
    struct nk_cursor cursors[NK_CURSOR_COUNT];

    int glyph_count;
    struct nk_font_glyph *glyphs;
    struct nk_font *default_font;
    struct nk_font *fonts;
    struct nk_font_config *config;
    int font_num;
};

/* some language glyph codepoint ranges */
NK_API const nk_rune *nk_font_default_glyph_ranges(void);
NK_API const nk_rune *nk_font_chinese_glyph_ranges(void);
NK_API const nk_rune *nk_font_cyrillic_glyph_ranges(void);
NK_API const nk_rune *nk_font_korean_glyph_ranges(void);

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void nk_font_atlas_init_default(struct nk_font_atlas*);
#endif
NK_API void nk_font_atlas_init(struct nk_font_atlas*, struct nk_allocator*);
NK_API void nk_font_atlas_init_custom(struct nk_font_atlas*, struct nk_allocator *persistent, struct nk_allocator *transient);
NK_API void nk_font_atlas_begin(struct nk_font_atlas*);
NK_API struct nk_font_config nk_font_config(float pixel_height);
NK_API struct nk_font *nk_font_atlas_add(struct nk_font_atlas*, const struct nk_font_config*);
#ifdef NK_INCLUDE_DEFAULT_FONT
NK_API struct nk_font* nk_font_atlas_add_default(struct nk_font_atlas*, float height, const struct nk_font_config*);
#endif
NK_API struct nk_font* nk_font_atlas_add_from_memory(struct nk_font_atlas *atlas, void *memory, nk_size size, float height, const struct nk_font_config *config);
#ifdef NK_INCLUDE_STANDARD_IO
NK_API struct nk_font* nk_font_atlas_add_from_file(struct nk_font_atlas *atlas, const char *file_path, float height, const struct nk_font_config*);
#endif
NK_API struct nk_font *nk_font_atlas_add_compressed(struct nk_font_atlas*, void *memory, nk_size size, float height, const struct nk_font_config*);
NK_API struct nk_font* nk_font_atlas_add_compressed_base85(struct nk_font_atlas*, const char *data, float height, const struct nk_font_config *config);
NK_API const void* nk_font_atlas_bake(struct nk_font_atlas*, int *width, int *height, enum nk_font_atlas_format);
NK_API void nk_font_atlas_end(struct nk_font_atlas*, nk_handle tex, struct nk_draw_null_texture*);
NK_API const struct nk_font_glyph* nk_font_find_glyph(struct nk_font*, nk_rune unicode);
NK_API void nk_font_atlas_cleanup(struct nk_font_atlas *atlas);
NK_API void nk_font_atlas_clear(struct nk_font_atlas*);

#endif

/* ==============================================================
 *
 *                          MEMORY BUFFER
 *
 * ===============================================================*/
/*  A basic (double)-buffer with linear allocation and resetting as only
    freeing policy. The buffer's main purpose is to control all memory management
    inside the GUI toolkit and still leave memory control as much as possible in
    the hand of the user while also making sure the library is easy to use if
    not as much control is needed.
    In general all memory inside this library can be provided from the user in
    three different ways.

    The first way and the one providing most control is by just passing a fixed
    size memory block. In this case all control lies in the hand of the user
    since he can exactly control where the memory comes from and how much memory
    the library should consume. Of course using the fixed size API removes the
    ability to automatically resize a buffer if not enough memory is provided so
    you have to take over the resizing. While being a fixed sized buffer sounds
    quite limiting, it is very effective in this library since the actual memory
    consumption is quite stable and has a fixed upper bound for a lot of cases.

    If you don't want to think about how much memory the library should allocate
    at all time or have a very dynamic UI with unpredictable memory consumption
    habits but still want control over memory allocation you can use the dynamic
    allocator based API. The allocator consists of two callbacks for allocating
    and freeing memory and optional userdata so you can plugin your own allocator.

    The final and easiest way can be used by defining
    NK_INCLUDE_DEFAULT_ALLOCATOR which uses the standard library memory
    allocation functions malloc and free and takes over complete control over
    memory in this library.
*/
struct nk_memory_status {
    void *memory;
    unsigned int type;
    nk_size size;
    nk_size allocated;
    nk_size needed;
    nk_size calls;
};

enum nk_allocation_type {
    NK_BUFFER_FIXED,
    NK_BUFFER_DYNAMIC
};

enum nk_buffer_allocation_type {
    NK_BUFFER_FRONT,
    NK_BUFFER_BACK,
    NK_BUFFER_MAX
};

struct nk_buffer_marker {
    int active;
    nk_size offset;
};

struct nk_memory {void *ptr;nk_size size;};
struct nk_buffer {
    struct nk_buffer_marker marker[NK_BUFFER_MAX];
    /* buffer marker to free a buffer to a certain offset */
    struct nk_allocator pool;
    /* allocator callback for dynamic buffers */
    enum nk_allocation_type type;
    /* memory management type */
    struct nk_memory memory;
    /* memory and size of the current memory block */
    float grow_factor;
    /* growing factor for dynamic memory management */
    nk_size allocated;
    /* total amount of memory allocated */
    nk_size needed;
    /* totally consumed memory given that enough memory is present */
    nk_size calls;
    /* number of allocation calls */
    nk_size size;
    /* current size of the buffer */
};

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void nk_buffer_init_default(struct nk_buffer*);
#endif
NK_API void nk_buffer_init(struct nk_buffer*, const struct nk_allocator*, nk_size size);
NK_API void nk_buffer_init_fixed(struct nk_buffer*, void *memory, nk_size size);
NK_API void nk_buffer_info(struct nk_memory_status*, struct nk_buffer*);
NK_API void nk_buffer_push(struct nk_buffer*, enum nk_buffer_allocation_type type, const void *memory, nk_size size, nk_size align);
NK_API void nk_buffer_mark(struct nk_buffer*, enum nk_buffer_allocation_type type);
NK_API void nk_buffer_reset(struct nk_buffer*, enum nk_buffer_allocation_type type);
NK_API void nk_buffer_clear(struct nk_buffer*);
NK_API void nk_buffer_free(struct nk_buffer*);
NK_API void *nk_buffer_memory(struct nk_buffer*);
NK_API const void *nk_buffer_memory_const(const struct nk_buffer*);
NK_API nk_size nk_buffer_total(struct nk_buffer*);

/* ==============================================================
 *
 *                          STRING
 *
 * ===============================================================*/
/*  Basic string buffer which is only used in context with the text editor
 *  to manage and manipulate dynamic or fixed size string content. This is _NOT_
 *  the default string handling method. The only instance you should have any contact
 *  with this API is if you interact with an `nk_text_edit` object inside one of the
 *  copy and paste functions and even there only for more advanced cases. */
struct nk_str {
    struct nk_buffer buffer;
    int len; /* in codepoints/runes/glyphs */
};

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void nk_str_init_default(struct nk_str*);
#endif
NK_API void nk_str_init(struct nk_str*, const struct nk_allocator*, nk_size size);
NK_API void nk_str_init_fixed(struct nk_str*, void *memory, nk_size size);
NK_API void nk_str_clear(struct nk_str*);
NK_API void nk_str_free(struct nk_str*);

NK_API int nk_str_append_text_char(struct nk_str*, const char*, int);
NK_API int nk_str_append_str_char(struct nk_str*, const char*);
NK_API int nk_str_append_text_utf8(struct nk_str*, const char*, int);
NK_API int nk_str_append_str_utf8(struct nk_str*, const char*);
NK_API int nk_str_append_text_runes(struct nk_str*, const nk_rune*, int);
NK_API int nk_str_append_str_runes(struct nk_str*, const nk_rune*);

NK_API int nk_str_insert_at_char(struct nk_str*, int pos, const char*, int);
NK_API int nk_str_insert_at_rune(struct nk_str*, int pos, const char*, int);

NK_API int nk_str_insert_text_char(struct nk_str*, int pos, const char*, int);
NK_API int nk_str_insert_str_char(struct nk_str*, int pos, const char*);
NK_API int nk_str_insert_text_utf8(struct nk_str*, int pos, const char*, int);
NK_API int nk_str_insert_str_utf8(struct nk_str*, int pos, const char*);
NK_API int nk_str_insert_text_runes(struct nk_str*, int pos, const nk_rune*, int);
NK_API int nk_str_insert_str_runes(struct nk_str*, int pos, const nk_rune*);

NK_API void nk_str_remove_chars(struct nk_str*, int len);
NK_API void nk_str_remove_runes(struct nk_str *str, int len);
NK_API void nk_str_delete_chars(struct nk_str*, int pos, int len);
NK_API void nk_str_delete_runes(struct nk_str*, int pos, int len);

NK_API char *nk_str_at_char(struct nk_str*, int pos);
NK_API char *nk_str_at_rune(struct nk_str*, int pos, nk_rune *unicode, int *len);
NK_API nk_rune nk_str_rune_at(const struct nk_str*, int pos);
NK_API const char *nk_str_at_char_const(const struct nk_str*, int pos);
NK_API const char *nk_str_at_const(const struct nk_str*, int pos, nk_rune *unicode, int *len);

NK_API char *nk_str_get(struct nk_str*);
NK_API const char *nk_str_get_const(const struct nk_str*);
NK_API int nk_str_len(struct nk_str*);
NK_API int nk_str_len_char(struct nk_str*);

/*===============================================================
 *
 *                      TEXT EDITOR
 *
 * ===============================================================*/
/* Editing text in this library is handled by either `nk_edit_string` or
 * `nk_edit_buffer`. But like almost everything in this library there are multiple
 * ways of doing it and a balance between control and ease of use with memory
 * as well as functionality controlled by flags.
 *
 * This library generally allows three different levels of memory control:
 * First of is the most basic way of just providing a simple char array with
 * string length. This method is probably the easiest way of handling simple
 * user text input. Main upside is complete control over memory while the biggest
 * downside in comparison with the other two approaches is missing undo/redo.
 *
 * For UIs that require undo/redo the second way was created. It is based on
 * a fixed size nk_text_edit struct, which has an internal undo/redo stack.
 * This is mainly useful if you want something more like a text editor but don't want
 * to have a dynamically growing buffer.
 *
 * The final way is using a dynamically growing nk_text_edit struct, which
 * has both a default version if you don't care where memory comes from and an
 * allocator version if you do. While the text editor is quite powerful for its
 * complexity I would not recommend editing gigabytes of data with it.
 * It is rather designed for uses cases which make sense for a GUI library not for
 * an full blown text editor.
 */
#ifndef NK_TEXTEDIT_UNDOSTATECOUNT
#define NK_TEXTEDIT_UNDOSTATECOUNT     99
#endif

#ifndef NK_TEXTEDIT_UNDOCHARCOUNT
#define NK_TEXTEDIT_UNDOCHARCOUNT      999
#endif

struct nk_text_edit;
struct nk_clipboard {
    nk_handle userdata;
    nk_plugin_paste paste;
    nk_plugin_copy copy;
};

struct nk_text_undo_record {
   int where;
   short insert_length;
   short delete_length;
   short char_storage;
};

struct nk_text_undo_state {
   struct nk_text_undo_record undo_rec[NK_TEXTEDIT_UNDOSTATECOUNT];
   nk_rune undo_char[NK_TEXTEDIT_UNDOCHARCOUNT];
   short undo_point;
   short redo_point;
   short undo_char_point;
   short redo_char_point;
};

enum nk_text_edit_type {
    NK_TEXT_EDIT_SINGLE_LINE,
    NK_TEXT_EDIT_MULTI_LINE
};

enum nk_text_edit_mode {
    NK_TEXT_EDIT_MODE_VIEW,
    NK_TEXT_EDIT_MODE_INSERT,
    NK_TEXT_EDIT_MODE_REPLACE
};

struct nk_text_edit {
    struct nk_clipboard clip;
    struct nk_str string;
    nk_plugin_filter filter;
    struct nk_vec2 scrollbar;

    int cursor;
    int select_start;
    int select_end;
    unsigned char mode;
    unsigned char cursor_at_end_of_line;
    unsigned char initialized;
    unsigned char has_preferred_x;
    unsigned char single_line;
    unsigned char active;
    unsigned char padding1;
    float preferred_x;
    struct nk_text_undo_state undo;
};

/* filter function */
NK_API int nk_filter_default(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_ascii(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_float(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_decimal(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_hex(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_oct(const struct nk_text_edit*, nk_rune unicode);
NK_API int nk_filter_binary(const struct nk_text_edit*, nk_rune unicode);

/* text editor */
#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void nk_textedit_init_default(struct nk_text_edit*);
#endif
NK_API void nk_textedit_init(struct nk_text_edit*, struct nk_allocator*, nk_size size);
NK_API void nk_textedit_init_fixed(struct nk_text_edit*, void *memory, nk_size size);
NK_API void nk_textedit_free(struct nk_text_edit*);
NK_API void nk_textedit_text(struct nk_text_edit*, const char*, int total_len);
NK_API void nk_textedit_delete(struct nk_text_edit*, int where, int len);
NK_API void nk_textedit_delete_selection(struct nk_text_edit*);
NK_API void nk_textedit_select_all(struct nk_text_edit*);
NK_API int nk_textedit_cut(struct nk_text_edit*);
NK_API int nk_textedit_paste(struct nk_text_edit*, char const*, int len);
NK_API void nk_textedit_undo(struct nk_text_edit*);
NK_API void nk_textedit_redo(struct nk_text_edit*);

/* ===============================================================
 *
 *                          DRAWING
 *
 * ===============================================================*/
/*  This library was designed to be render backend agnostic so it does
    not draw anything to screen. Instead all drawn shapes, widgets
    are made of, are buffered into memory and make up a command queue.
    Each frame therefore fills the command buffer with draw commands
    that then need to be executed by the user and his own render backend.
    After that the command buffer needs to be cleared and a new frame can be
    started. It is probably important to note that the command buffer is the main
    drawing API and the optional vertex buffer API only takes this format and
    converts it into a hardware accessible format.

    To use the command queue to draw your own widgets you can access the
    command buffer of each window by calling `nk_window_get_canvas` after
    previously having called `nk_begin`:

        void draw_red_rectangle_widget(struct nk_context *ctx)
        {
            struct nk_command_buffer *canvas;
            struct nk_input *input = &ctx->input;
            canvas = nk_window_get_canvas(ctx);

            struct nk_rect space;
            enum nk_widget_layout_states state;
            state = nk_widget(&space, ctx);
            if (!state) return;

            if (state != NK_WIDGET_ROM)
                update_your_widget_by_user_input(...);
            nk_fill_rect(canvas, space, 0, nk_rgb(255,0,0));
        }

        if (nk_begin(...)) {
            nk_layout_row_dynamic(ctx, 25, 1);
            draw_red_rectangle_widget(ctx);
        }
        nk_end(..)

    Important to know if you want to create your own widgets is the `nk_widget`
    call. It allocates space on the panel reserved for this widget to be used,
    but also returns the state of the widget space. If your widget is not seen and does
    not have to be updated it is '0' and you can just return. If it only has
    to be drawn the state will be `NK_WIDGET_ROM` otherwise you can do both
    update and draw your widget. The reason for separating is to only draw and
    update what is actually necessary which is crucial for performance.
*/
enum nk_command_type {
    NK_COMMAND_NOP,
    NK_COMMAND_SCISSOR,
    NK_COMMAND_LINE,
    NK_COMMAND_CURVE,
    NK_COMMAND_RECT,
    NK_COMMAND_RECT_FILLED,
    NK_COMMAND_RECT_MULTI_COLOR,
    NK_COMMAND_CIRCLE,
    NK_COMMAND_CIRCLE_FILLED,
    NK_COMMAND_ARC,
    NK_COMMAND_ARC_FILLED,
    NK_COMMAND_TRIANGLE,
    NK_COMMAND_TRIANGLE_FILLED,
    NK_COMMAND_POLYGON,
    NK_COMMAND_POLYGON_FILLED,
    NK_COMMAND_POLYLINE,
    NK_COMMAND_TEXT,
    NK_COMMAND_IMAGE,
    NK_COMMAND_CUSTOM
};

/* command base and header of every command inside the buffer */
struct nk_command {
    enum nk_command_type type;
    nk_size next;
#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_handle userdata;
#endif
};

struct nk_command_scissor {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
};

struct nk_command_line {
    struct nk_command header;
    unsigned short line_thickness;
    struct nk_vec2i begin;
    struct nk_vec2i end;
    struct nk_color color;
};

struct nk_command_curve {
    struct nk_command header;
    unsigned short line_thickness;
    struct nk_vec2i begin;
    struct nk_vec2i end;
    struct nk_vec2i ctrl[2];
    struct nk_color color;
};

struct nk_command_rect {
    struct nk_command header;
    unsigned short rounding;
    unsigned short line_thickness;
    short x, y;
    unsigned short w, h;
    struct nk_color color;
};

struct nk_command_rect_filled {
    struct nk_command header;
    unsigned short rounding;
    short x, y;
    unsigned short w, h;
    struct nk_color color;
};

struct nk_command_rect_multi_color {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
    struct nk_color left;
    struct nk_color top;
    struct nk_color bottom;
    struct nk_color right;
};

struct nk_command_triangle {
    struct nk_command header;
    unsigned short line_thickness;
    struct nk_vec2i a;
    struct nk_vec2i b;
    struct nk_vec2i c;
    struct nk_color color;
};

struct nk_command_triangle_filled {
    struct nk_command header;
    struct nk_vec2i a;
    struct nk_vec2i b;
    struct nk_vec2i c;
    struct nk_color color;
};

struct nk_command_circle {
    struct nk_command header;
    short x, y;
    unsigned short line_thickness;
    unsigned short w, h;
    struct nk_color color;
};

struct nk_command_circle_filled {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
    struct nk_color color;
};

struct nk_command_arc {
    struct nk_command header;
    short cx, cy;
    unsigned short r;
    unsigned short line_thickness;
    float a[2];
    struct nk_color color;
};

struct nk_command_arc_filled {
    struct nk_command header;
    short cx, cy;
    unsigned short r;
    float a[2];
    struct nk_color color;
};

struct nk_command_polygon {
    struct nk_command header;
    struct nk_color color;
    unsigned short line_thickness;
    unsigned short point_count;
    struct nk_vec2i points[1];
};

struct nk_command_polygon_filled {
    struct nk_command header;
    struct nk_color color;
    unsigned short point_count;
    struct nk_vec2i points[1];
};

struct nk_command_polyline {
    struct nk_command header;
    struct nk_color color;
    unsigned short line_thickness;
    unsigned short point_count;
    struct nk_vec2i points[1];
};

struct nk_command_image {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
    struct nk_image img;
    struct nk_color col;
};

typedef void (*nk_command_custom_callback)(void *canvas, short x,short y,
    unsigned short w, unsigned short h, nk_handle callback_data);
struct nk_command_custom {
    struct nk_command header;
    short x, y;
    unsigned short w, h;
    nk_handle callback_data;
    nk_command_custom_callback callback;
};

struct nk_command_text {
    struct nk_command header;
    const struct nk_user_font *font;
    struct nk_color background;
    struct nk_color foreground;
    short x, y;
    unsigned short w, h;
    float height;
    int length;
    char string[1];
};

enum nk_command_clipping {
    NK_CLIPPING_OFF = nk_false,
    NK_CLIPPING_ON = nk_true
};

struct nk_command_buffer {
    struct nk_buffer *base;
    struct nk_rect clip;
    int use_clipping;
    nk_handle userdata;
    nk_size begin, end, last;
};

/* shape outlines */
NK_API void nk_stroke_line(struct nk_command_buffer *b, float x0, float y0, float x1, float y1, float line_thickness, struct nk_color);
NK_API void nk_stroke_curve(struct nk_command_buffer*, float, float, float, float, float, float, float, float, float line_thickness, struct nk_color);
NK_API void nk_stroke_rect(struct nk_command_buffer*, struct nk_rect, float rounding, float line_thickness, struct nk_color);
NK_API void nk_stroke_circle(struct nk_command_buffer*, struct nk_rect, float line_thickness, struct nk_color);
NK_API void nk_stroke_arc(struct nk_command_buffer*, float cx, float cy, float radius, float a_min, float a_max, float line_thickness, struct nk_color);
NK_API void nk_stroke_triangle(struct nk_command_buffer*, float, float, float, float, float, float, float line_thichness, struct nk_color);
NK_API void nk_stroke_polyline(struct nk_command_buffer*, float *points, int point_count, float line_thickness, struct nk_color col);
NK_API void nk_stroke_polygon(struct nk_command_buffer*, float*, int point_count, float line_thickness, struct nk_color);

/* filled shades */
NK_API void nk_fill_rect(struct nk_command_buffer*, struct nk_rect, float rounding, struct nk_color);
NK_API void nk_fill_rect_multi_color(struct nk_command_buffer*, struct nk_rect, struct nk_color left, struct nk_color top, struct nk_color right, struct nk_color bottom);
NK_API void nk_fill_circle(struct nk_command_buffer*, struct nk_rect, struct nk_color);
NK_API void nk_fill_arc(struct nk_command_buffer*, float cx, float cy, float radius, float a_min, float a_max, struct nk_color);
NK_API void nk_fill_triangle(struct nk_command_buffer*, float x0, float y0, float x1, float y1, float x2, float y2, struct nk_color);
NK_API void nk_fill_polygon(struct nk_command_buffer*, float*, int point_count, struct nk_color);

/* misc */
NK_API void nk_draw_image(struct nk_command_buffer*, struct nk_rect, const struct nk_image*, struct nk_color);
NK_API void nk_draw_text(struct nk_command_buffer*, struct nk_rect, const char *text, int len, const struct nk_user_font*, struct nk_color, struct nk_color);
NK_API void nk_push_scissor(struct nk_command_buffer*, struct nk_rect);
NK_API void nk_push_custom(struct nk_command_buffer*, struct nk_rect, nk_command_custom_callback, nk_handle usr);

/* ===============================================================
 *
 *                          INPUT
 *
 * ===============================================================*/
struct nk_mouse_button {
    int down;
    unsigned int clicked;
    struct nk_vec2 clicked_pos;
};
struct nk_mouse {
    struct nk_mouse_button buttons[NK_BUTTON_MAX];
    struct nk_vec2 pos;
    struct nk_vec2 prev;
    struct nk_vec2 delta;
    struct nk_vec2 scroll_delta;
    unsigned char grab;
    unsigned char grabbed;
    unsigned char ungrab;
};

struct nk_key {
    int down;
    unsigned int clicked;
};
struct nk_keyboard {
    struct nk_key keys[NK_KEY_MAX];
    char text[NK_INPUT_MAX];
    int text_len;
};

struct nk_input {
    struct nk_keyboard keyboard;
    struct nk_mouse mouse;
};

NK_API int nk_input_has_mouse_click(const struct nk_input*, enum nk_buttons);
NK_API int nk_input_has_mouse_click_in_rect(const struct nk_input*, enum nk_buttons, struct nk_rect);
NK_API int nk_input_has_mouse_click_down_in_rect(const struct nk_input*, enum nk_buttons, struct nk_rect, int down);
NK_API int nk_input_is_mouse_click_in_rect(const struct nk_input*, enum nk_buttons, struct nk_rect);
NK_API int nk_input_is_mouse_click_down_in_rect(const struct nk_input *i, enum nk_buttons id, struct nk_rect b, int down);
NK_API int nk_input_any_mouse_click_in_rect(const struct nk_input*, struct nk_rect);
NK_API int nk_input_is_mouse_prev_hovering_rect(const struct nk_input*, struct nk_rect);
NK_API int nk_input_is_mouse_hovering_rect(const struct nk_input*, struct nk_rect);
NK_API int nk_input_mouse_clicked(const struct nk_input*, enum nk_buttons, struct nk_rect);
NK_API int nk_input_is_mouse_down(const struct nk_input*, enum nk_buttons);
NK_API int nk_input_is_mouse_pressed(const struct nk_input*, enum nk_buttons);
NK_API int nk_input_is_mouse_released(const struct nk_input*, enum nk_buttons);
NK_API int nk_input_is_key_pressed(const struct nk_input*, enum nk_keys);
NK_API int nk_input_is_key_released(const struct nk_input*, enum nk_keys);
NK_API int nk_input_is_key_down(const struct nk_input*, enum nk_keys);

/* ===============================================================
 *
 *                          DRAW LIST
 *
 * ===============================================================*/
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
/*  The optional vertex buffer draw list provides a 2D drawing context
    with antialiasing functionality which takes basic filled or outlined shapes
    or a path and outputs vertexes, elements and draw commands.
    The actual draw list API is not required to be used directly while using this
    library since converting the default library draw command output is done by
    just calling `nk_convert` but I decided to still make this library accessible
    since it can be useful.

    The draw list is based on a path buffering and polygon and polyline
    rendering API which allows a lot of ways to draw 2D content to screen.
    In fact it is probably more powerful than needed but allows even more crazy
    things than this library provides by default.
*/
typedef nk_ushort nk_draw_index;
enum nk_draw_list_stroke {
    NK_STROKE_OPEN = nk_false,
    /* build up path has no connection back to the beginning */
    NK_STROKE_CLOSED = nk_true
    /* build up path has a connection back to the beginning */
};

enum nk_draw_vertex_layout_attribute {
    NK_VERTEX_POSITION,
    NK_VERTEX_COLOR,
    NK_VERTEX_TEXCOORD,
    NK_VERTEX_ATTRIBUTE_COUNT
};

enum nk_draw_vertex_layout_format {
    NK_FORMAT_SCHAR,
    NK_FORMAT_SSHORT,
    NK_FORMAT_SINT,
    NK_FORMAT_UCHAR,
    NK_FORMAT_USHORT,
    NK_FORMAT_UINT,
    NK_FORMAT_FLOAT,
    NK_FORMAT_DOUBLE,

NK_FORMAT_COLOR_BEGIN,
    NK_FORMAT_R8G8B8 = NK_FORMAT_COLOR_BEGIN,
    NK_FORMAT_R16G15B16,
    NK_FORMAT_R32G32B32,

    NK_FORMAT_R8G8B8A8,
    NK_FORMAT_B8G8R8A8,
    NK_FORMAT_R16G15B16A16,
    NK_FORMAT_R32G32B32A32,
    NK_FORMAT_R32G32B32A32_FLOAT,
    NK_FORMAT_R32G32B32A32_DOUBLE,

    NK_FORMAT_RGB32,
    NK_FORMAT_RGBA32,
NK_FORMAT_COLOR_END = NK_FORMAT_RGBA32,
    NK_FORMAT_COUNT
};

#define NK_VERTEX_LAYOUT_END NK_VERTEX_ATTRIBUTE_COUNT,NK_FORMAT_COUNT,0
struct nk_draw_vertex_layout_element {
    enum nk_draw_vertex_layout_attribute attribute;
    enum nk_draw_vertex_layout_format format;
    nk_size offset;
};

struct nk_draw_command {
    unsigned int elem_count;
    /* number of elements in the current draw batch */
    struct nk_rect clip_rect;
    /* current screen clipping rectangle */
    nk_handle texture;
    /* current texture to set */
#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_handle userdata;
#endif
};

struct nk_draw_list {
    struct nk_rect clip_rect;
    struct nk_vec2 circle_vtx[12];
    struct nk_convert_config config;

    struct nk_buffer *buffer;
    struct nk_buffer *vertices;
    struct nk_buffer *elements;

    unsigned int element_count;
    unsigned int vertex_count;
    unsigned int cmd_count;
    nk_size cmd_offset;

    unsigned int path_count;
    unsigned int path_offset;

    enum nk_anti_aliasing line_AA;
    enum nk_anti_aliasing shape_AA;

#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_handle userdata;
#endif
};

/* draw list */
NK_API void nk_draw_list_init(struct nk_draw_list*);
NK_API void nk_draw_list_setup(struct nk_draw_list*, const struct nk_convert_config*, struct nk_buffer *cmds, struct nk_buffer *vertices, struct nk_buffer *elements, enum nk_anti_aliasing line_aa,enum nk_anti_aliasing shape_aa);
NK_API void nk_draw_list_clear(struct nk_draw_list*);

/* drawing */
#define nk_draw_list_foreach(cmd, can, b) for((cmd)=nk__draw_list_begin(can, b); (cmd)!=0; (cmd)=nk__draw_list_next(cmd, b, can))
NK_API const struct nk_draw_command* nk__draw_list_begin(const struct nk_draw_list*, const struct nk_buffer*);
NK_API const struct nk_draw_command* nk__draw_list_next(const struct nk_draw_command*, const struct nk_buffer*, const struct nk_draw_list*);
NK_API const struct nk_draw_command* nk__draw_list_end(const struct nk_draw_list*, const struct nk_buffer*);
NK_API void nk_draw_list_clear(struct nk_draw_list *list);

/* path */
NK_API void nk_draw_list_path_clear(struct nk_draw_list*);
NK_API void nk_draw_list_path_line_to(struct nk_draw_list*, struct nk_vec2 pos);
NK_API void nk_draw_list_path_arc_to_fast(struct nk_draw_list*, struct nk_vec2 center, float radius, int a_min, int a_max);
NK_API void nk_draw_list_path_arc_to(struct nk_draw_list*, struct nk_vec2 center, float radius, float a_min, float a_max, unsigned int segments);
NK_API void nk_draw_list_path_rect_to(struct nk_draw_list*, struct nk_vec2 a, struct nk_vec2 b, float rounding);
NK_API void nk_draw_list_path_curve_to(struct nk_draw_list*, struct nk_vec2 p2, struct nk_vec2 p3, struct nk_vec2 p4, unsigned int num_segments);
NK_API void nk_draw_list_path_fill(struct nk_draw_list*, struct nk_color);
NK_API void nk_draw_list_path_stroke(struct nk_draw_list*, struct nk_color, enum nk_draw_list_stroke closed, float thickness);

/* stroke */
NK_API void nk_draw_list_stroke_line(struct nk_draw_list*, struct nk_vec2 a, struct nk_vec2 b, struct nk_color, float thickness);
NK_API void nk_draw_list_stroke_rect(struct nk_draw_list*, struct nk_rect rect, struct nk_color, float rounding, float thickness);
NK_API void nk_draw_list_stroke_triangle(struct nk_draw_list*, struct nk_vec2 a, struct nk_vec2 b, struct nk_vec2 c, struct nk_color, float thickness);
NK_API void nk_draw_list_stroke_circle(struct nk_draw_list*, struct nk_vec2 center, float radius, struct nk_color, unsigned int segs, float thickness);
NK_API void nk_draw_list_stroke_curve(struct nk_draw_list*, struct nk_vec2 p0, struct nk_vec2 cp0, struct nk_vec2 cp1, struct nk_vec2 p1, struct nk_color, unsigned int segments, float thickness);
NK_API void nk_draw_list_stroke_poly_line(struct nk_draw_list*, const struct nk_vec2 *pnts, const unsigned int cnt, struct nk_color, enum nk_draw_list_stroke, float thickness, enum nk_anti_aliasing);

/* fill */
NK_API void nk_draw_list_fill_rect(struct nk_draw_list*, struct nk_rect rect, struct nk_color, float rounding);
NK_API void nk_draw_list_fill_rect_multi_color(struct nk_draw_list*, struct nk_rect rect, struct nk_color left, struct nk_color top, struct nk_color right, struct nk_color bottom);
NK_API void nk_draw_list_fill_triangle(struct nk_draw_list*, struct nk_vec2 a, struct nk_vec2 b, struct nk_vec2 c, struct nk_color);
NK_API void nk_draw_list_fill_circle(struct nk_draw_list*, struct nk_vec2 center, float radius, struct nk_color col, unsigned int segs);
NK_API void nk_draw_list_fill_poly_convex(struct nk_draw_list*, const struct nk_vec2 *points, const unsigned int count, struct nk_color, enum nk_anti_aliasing);

/* misc */
NK_API void nk_draw_list_add_image(struct nk_draw_list*, struct nk_image texture, struct nk_rect rect, struct nk_color);
NK_API void nk_draw_list_add_text(struct nk_draw_list*, const struct nk_user_font*, struct nk_rect, const char *text, int len, float font_height, struct nk_color);
#ifdef NK_INCLUDE_COMMAND_USERDATA
NK_API void nk_draw_list_push_userdata(struct nk_draw_list*, nk_handle userdata);
#endif

#endif

/* ===============================================================
 *
 *                          GUI
 *
 * ===============================================================*/
enum nk_style_item_type {
    NK_STYLE_ITEM_COLOR,
    NK_STYLE_ITEM_IMAGE
};

union nk_style_item_data {
    struct nk_image image;
    struct nk_color color;
};

struct nk_style_item {
    enum nk_style_item_type type;
    union nk_style_item_data data;
};

struct nk_style_text {
    struct nk_color color;
    struct nk_vec2 padding;
};

struct nk_style_button {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* text */
    struct nk_color text_background;
    struct nk_color text_normal;
    struct nk_color text_hover;
    struct nk_color text_active;
    nk_flags text_alignment;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 padding;
    struct nk_vec2 image_padding;
    struct nk_vec2 touch_padding;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle userdata);
    void(*draw_end)(struct nk_command_buffer*, nk_handle userdata);
};

struct nk_style_toggle {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* cursor */
    struct nk_style_item cursor_normal;
    struct nk_style_item cursor_hover;

    /* text */
    struct nk_color text_normal;
    struct nk_color text_hover;
    struct nk_color text_active;
    struct nk_color text_background;
    nk_flags text_alignment;

    /* properties */
    struct nk_vec2 padding;
    struct nk_vec2 touch_padding;
    float spacing;
    float border;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_selectable {
    /* background (inactive) */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item pressed;

    /* background (active) */
    struct nk_style_item normal_active;
    struct nk_style_item hover_active;
    struct nk_style_item pressed_active;

    /* text color (inactive) */
    struct nk_color text_normal;
    struct nk_color text_hover;
    struct nk_color text_pressed;

    /* text color (active) */
    struct nk_color text_normal_active;
    struct nk_color text_hover_active;
    struct nk_color text_pressed_active;
    struct nk_color text_background;
    nk_flags text_alignment;

    /* properties */
    float rounding;
    struct nk_vec2 padding;
    struct nk_vec2 touch_padding;
    struct nk_vec2 image_padding;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_slider {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* background bar */
    struct nk_color bar_normal;
    struct nk_color bar_hover;
    struct nk_color bar_active;
    struct nk_color bar_filled;

    /* cursor */
    struct nk_style_item cursor_normal;
    struct nk_style_item cursor_hover;
    struct nk_style_item cursor_active;

    /* properties */
    float border;
    float rounding;
    float bar_height;
    struct nk_vec2 padding;
    struct nk_vec2 spacing;
    struct nk_vec2 cursor_size;

    /* optional buttons */
    int show_buttons;
    struct nk_style_button inc_button;
    struct nk_style_button dec_button;
    enum nk_symbol_type inc_symbol;
    enum nk_symbol_type dec_symbol;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_progress {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* cursor */
    struct nk_style_item cursor_normal;
    struct nk_style_item cursor_hover;
    struct nk_style_item cursor_active;
    struct nk_color cursor_border_color;

    /* properties */
    float rounding;
    float border;
    float cursor_border;
    float cursor_rounding;
    struct nk_vec2 padding;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_scrollbar {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* cursor */
    struct nk_style_item cursor_normal;
    struct nk_style_item cursor_hover;
    struct nk_style_item cursor_active;
    struct nk_color cursor_border_color;

    /* properties */
    float border;
    float rounding;
    float border_cursor;
    float rounding_cursor;
    struct nk_vec2 padding;

    /* optional buttons */
    int show_buttons;
    struct nk_style_button inc_button;
    struct nk_style_button dec_button;
    enum nk_symbol_type inc_symbol;
    enum nk_symbol_type dec_symbol;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_edit {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;
    struct nk_style_scrollbar scrollbar;

    /* cursor  */
    struct nk_color cursor_normal;
    struct nk_color cursor_hover;
    struct nk_color cursor_text_normal;
    struct nk_color cursor_text_hover;

    /* text (unselected) */
    struct nk_color text_normal;
    struct nk_color text_hover;
    struct nk_color text_active;

    /* text (selected) */
    struct nk_color selected_normal;
    struct nk_color selected_hover;
    struct nk_color selected_text_normal;
    struct nk_color selected_text_hover;

    /* properties */
    float border;
    float rounding;
    float cursor_size;
    struct nk_vec2 scrollbar_size;
    struct nk_vec2 padding;
    float row_padding;
};

struct nk_style_property {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* text */
    struct nk_color label_normal;
    struct nk_color label_hover;
    struct nk_color label_active;

    /* symbols */
    enum nk_symbol_type sym_left;
    enum nk_symbol_type sym_right;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 padding;

    struct nk_style_edit edit;
    struct nk_style_button inc_button;
    struct nk_style_button dec_button;

    /* optional user callbacks */
    nk_handle userdata;
    void(*draw_begin)(struct nk_command_buffer*, nk_handle);
    void(*draw_end)(struct nk_command_buffer*, nk_handle);
};

struct nk_style_chart {
    /* colors */
    struct nk_style_item background;
    struct nk_color border_color;
    struct nk_color selected_color;
    struct nk_color color;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 padding;
};

struct nk_style_combo {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;
    struct nk_color border_color;

    /* label */
    struct nk_color label_normal;
    struct nk_color label_hover;
    struct nk_color label_active;

    /* symbol */
    struct nk_color symbol_normal;
    struct nk_color symbol_hover;
    struct nk_color symbol_active;

    /* button */
    struct nk_style_button button;
    enum nk_symbol_type sym_normal;
    enum nk_symbol_type sym_hover;
    enum nk_symbol_type sym_active;

    /* properties */
    float border;
    float rounding;
    struct nk_vec2 content_padding;
    struct nk_vec2 button_padding;
    struct nk_vec2 spacing;
};

struct nk_style_tab {
    /* background */
    struct nk_style_item background;
    struct nk_color border_color;
    struct nk_color text;

    /* button */
    struct nk_style_button tab_maximize_button;
    struct nk_style_button tab_minimize_button;
    struct nk_style_button node_maximize_button;
    struct nk_style_button node_minimize_button;
    enum nk_symbol_type sym_minimize;
    enum nk_symbol_type sym_maximize;

    /* properties */
    float border;
    float rounding;
    float indent;
    struct nk_vec2 padding;
    struct nk_vec2 spacing;
};

enum nk_style_header_align {
    NK_HEADER_LEFT,
    NK_HEADER_RIGHT
};
struct nk_style_window_header {
    /* background */
    struct nk_style_item normal;
    struct nk_style_item hover;
    struct nk_style_item active;

    /* button */
    struct nk_style_button close_button;
    struct nk_style_button minimize_button;
    enum nk_symbol_type close_symbol;
    enum nk_symbol_type minimize_symbol;
    enum nk_symbol_type maximize_symbol;

    /* title */
    struct nk_color label_normal;
    struct nk_color label_hover;
    struct nk_color label_active;

    /* properties */
    enum nk_style_header_align align;
    struct nk_vec2 padding;
    struct nk_vec2 label_padding;
    struct nk_vec2 spacing;
};

struct nk_style_window {
    struct nk_style_window_header header;
    struct nk_style_item fixed_background;
    struct nk_color background;

    struct nk_color border_color;
    struct nk_color popup_border_color;
    struct nk_color combo_border_color;
    struct nk_color contextual_border_color;
    struct nk_color menu_border_color;
    struct nk_color group_border_color;
    struct nk_color tooltip_border_color;
    struct nk_style_item scaler;

    float border;
    float combo_border;
    float contextual_border;
    float menu_border;
    float group_border;
    float tooltip_border;
    float popup_border;
    float min_row_height_padding;

    float rounding;
    struct nk_vec2 spacing;
    struct nk_vec2 scrollbar_size;
    struct nk_vec2 min_size;

    struct nk_vec2 padding;
    struct nk_vec2 group_padding;
    struct nk_vec2 popup_padding;
    struct nk_vec2 combo_padding;
    struct nk_vec2 contextual_padding;
    struct nk_vec2 menu_padding;
    struct nk_vec2 tooltip_padding;
};

struct nk_style {
    const struct nk_user_font *font;
    const struct nk_cursor *cursors[NK_CURSOR_COUNT];
    const struct nk_cursor *cursor_active;
    struct nk_cursor *cursor_last;
    int cursor_visible;

    struct nk_style_text text;
    struct nk_style_button button;
    struct nk_style_button contextual_button;
    struct nk_style_button menu_button;
    struct nk_style_toggle option;
    struct nk_style_toggle checkbox;
    struct nk_style_selectable selectable;
    struct nk_style_slider slider;
    struct nk_style_progress progress;
    struct nk_style_property property;
    struct nk_style_edit edit;
    struct nk_style_chart chart;
    struct nk_style_scrollbar scrollh;
    struct nk_style_scrollbar scrollv;
    struct nk_style_tab tab;
    struct nk_style_combo combo;
    struct nk_style_window window;
};

NK_API struct nk_style_item nk_style_item_image(struct nk_image img);
NK_API struct nk_style_item nk_style_item_color(struct nk_color);
NK_API struct nk_style_item nk_style_item_hide(void);

/*==============================================================
 *                          PANEL
 * =============================================================*/
#ifndef NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS
#define NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS 16
#endif
#ifndef NK_CHART_MAX_SLOT
#define NK_CHART_MAX_SLOT 4
#endif

enum nk_panel_type {
    NK_PANEL_WINDOW     = NK_FLAG(0),
    NK_PANEL_GROUP      = NK_FLAG(1),
    NK_PANEL_POPUP      = NK_FLAG(2),
    NK_PANEL_CONTEXTUAL = NK_FLAG(4),
    NK_PANEL_COMBO      = NK_FLAG(5),
    NK_PANEL_MENU       = NK_FLAG(6),
    NK_PANEL_TOOLTIP    = NK_FLAG(7)
};
enum nk_panel_set {
    NK_PANEL_SET_NONBLOCK = NK_PANEL_CONTEXTUAL|NK_PANEL_COMBO|NK_PANEL_MENU|NK_PANEL_TOOLTIP,
    NK_PANEL_SET_POPUP = NK_PANEL_SET_NONBLOCK|NK_PANEL_POPUP,
    NK_PANEL_SET_SUB = NK_PANEL_SET_POPUP|NK_PANEL_GROUP
};

struct nk_chart_slot {
    enum nk_chart_type type;
    struct nk_color color;
    struct nk_color highlight;
    float min, max, range;
    int count;
    struct nk_vec2 last;
    int index;
};

struct nk_chart {
    int slot;
    float x, y, w, h;
    struct nk_chart_slot slots[NK_CHART_MAX_SLOT];
};

enum nk_panel_row_layout_type {
    NK_LAYOUT_DYNAMIC_FIXED = 0,
    NK_LAYOUT_DYNAMIC_ROW,
    NK_LAYOUT_DYNAMIC_FREE,
    NK_LAYOUT_DYNAMIC,
    NK_LAYOUT_STATIC_FIXED,
    NK_LAYOUT_STATIC_ROW,
    NK_LAYOUT_STATIC_FREE,
    NK_LAYOUT_STATIC,
    NK_LAYOUT_TEMPLATE,
    NK_LAYOUT_COUNT
};
struct nk_row_layout {
    enum nk_panel_row_layout_type type;
    int index;
    float height;
    float min_height;
    int columns;
    const float *ratio;
    float item_width;
    float item_height;
    float item_offset;
    float filled;
    struct nk_rect item;
    int tree_depth;
    float templates[NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS];
};

struct nk_popup_buffer {
    nk_size begin;
    nk_size parent;
    nk_size last;
    nk_size end;
    int active;
};

struct nk_menu_state {
    float x, y, w, h;
    struct nk_scroll offset;
};

struct nk_panel {
    enum nk_panel_type type;
    nk_flags flags;
    struct nk_rect bounds;
    nk_uint *offset_x;
    nk_uint *offset_y;
    float at_x, at_y, max_x;
    float footer_height;
    float header_height;
    float border;
    unsigned int has_scrolling;
    struct nk_rect clip;
    struct nk_menu_state menu;
    struct nk_row_layout row;
    struct nk_chart chart;
    struct nk_command_buffer *buffer;
    struct nk_panel *parent;
};

/*==============================================================
 *                          WINDOW
 * =============================================================*/
#ifndef NK_WINDOW_MAX_NAME
#define NK_WINDOW_MAX_NAME 64
#endif

struct nk_table;
enum nk_window_flags {
    NK_WINDOW_PRIVATE       = NK_FLAG(11),
    NK_WINDOW_DYNAMIC       = NK_WINDOW_PRIVATE,
    /* special window type growing up in height while being filled to a certain maximum height */
    NK_WINDOW_ROM           = NK_FLAG(12),
    /* sets window widgets into a read only mode and does not allow input changes */
    NK_WINDOW_NOT_INTERACTIVE = NK_WINDOW_ROM|NK_WINDOW_NO_INPUT,
    /* prevents all interaction caused by input to either window or widgets inside */
    NK_WINDOW_HIDDEN        = NK_FLAG(13),
    /* Hides window and stops any window interaction and drawing */
    NK_WINDOW_CLOSED        = NK_FLAG(14),
    /* Directly closes and frees the window at the end of the frame */
    NK_WINDOW_MINIMIZED     = NK_FLAG(15),
    /* marks the window as minimized */
    NK_WINDOW_REMOVE_ROM    = NK_FLAG(16)
    /* Removes read only mode at the end of the window */
};

struct nk_popup_state {
    struct nk_window *win;
    enum nk_panel_type type;
    struct nk_popup_buffer buf;
    nk_hash name;
    int active;
    unsigned combo_count;
    unsigned con_count, con_old;
    unsigned active_con;
    struct nk_rect header;
};

struct nk_edit_state {
    nk_hash name;
    unsigned int seq;
    unsigned int old;
    int active, prev;
    int cursor;
    int sel_start;
    int sel_end;
    struct nk_scroll scrollbar;
    unsigned char mode;
    unsigned char single_line;
};

struct nk_property_state {
    int active, prev;
    char buffer[NK_MAX_NUMBER_BUFFER];
    int length;
    int cursor;
    int select_start;
    int select_end;
    nk_hash name;
    unsigned int seq;
    unsigned int old;
    int state;
};

struct nk_window {
    unsigned int seq;
    nk_hash name;
    char name_string[NK_WINDOW_MAX_NAME];
    nk_flags flags;

    struct nk_rect bounds;
    struct nk_scroll scrollbar;
    struct nk_command_buffer buffer;
    struct nk_panel *layout;
    float scrollbar_hiding_timer;

    /* persistent widget state */
    struct nk_property_state property;
    struct nk_popup_state popup;
    struct nk_edit_state edit;
    unsigned int scrolled;

    struct nk_table *tables;
    unsigned int table_count;

    /* window list hooks */
    struct nk_window *next;
    struct nk_window *prev;
    struct nk_window *parent;
};

/*==============================================================
 *                          STACK
 * =============================================================*/
/* The style modifier stack can be used to temporarily change a
 * property inside `nk_style`. For example if you want a special
 * red button you can temporarily push the old button color onto a stack
 * draw the button with a red color and then you just pop the old color
 * back from the stack:
 *
 *      nk_style_push_style_item(ctx, &ctx->style.button.normal, nk_style_item_color(nk_rgb(255,0,0)));
 *      nk_style_push_style_item(ctx, &ctx->style.button.hover, nk_style_item_color(nk_rgb(255,0,0)));
 *      nk_style_push_style_item(ctx, &ctx->style.button.active, nk_style_item_color(nk_rgb(255,0,0)));
 *      nk_style_push_vec2(ctx, &cx->style.button.padding, nk_vec2(2,2));
 *
 *      nk_button(...);
 *
 *      nk_style_pop_style_item(ctx);
 *      nk_style_pop_style_item(ctx);
 *      nk_style_pop_style_item(ctx);
 *      nk_style_pop_vec2(ctx);
 *
 * Nuklear has a stack for style_items, float properties, vector properties,
 * flags, colors, fonts and for button_behavior. Each has it's own fixed size stack
 * which can be changed at compile time.
 */
#ifndef NK_BUTTON_BEHAVIOR_STACK_SIZE
#define NK_BUTTON_BEHAVIOR_STACK_SIZE 8
#endif

#ifndef NK_FONT_STACK_SIZE
#define NK_FONT_STACK_SIZE 8
#endif

#ifndef NK_STYLE_ITEM_STACK_SIZE
#define NK_STYLE_ITEM_STACK_SIZE 16
#endif

#ifndef NK_FLOAT_STACK_SIZE
#define NK_FLOAT_STACK_SIZE 32
#endif

#ifndef NK_VECTOR_STACK_SIZE
#define NK_VECTOR_STACK_SIZE 16
#endif

#ifndef NK_FLAGS_STACK_SIZE
#define NK_FLAGS_STACK_SIZE 32
#endif

#ifndef NK_COLOR_STACK_SIZE
#define NK_COLOR_STACK_SIZE 32
#endif

#define NK_CONFIGURATION_STACK_TYPE(prefix, name, type)\
    struct nk_config_stack_##name##_element {\
        prefix##_##type *address;\
        prefix##_##type old_value;\
    }
#define NK_CONFIG_STACK(type,size)\
    struct nk_config_stack_##type {\
        int head;\
        struct nk_config_stack_##type##_element elements[size];\
    }

#define nk_float float
NK_CONFIGURATION_STACK_TYPE(struct nk, style_item, style_item);
NK_CONFIGURATION_STACK_TYPE(nk ,float, float);
NK_CONFIGURATION_STACK_TYPE(struct nk, vec2, vec2);
NK_CONFIGURATION_STACK_TYPE(nk ,flags, flags);
NK_CONFIGURATION_STACK_TYPE(struct nk, color, color);
NK_CONFIGURATION_STACK_TYPE(const struct nk, user_font, user_font*);
NK_CONFIGURATION_STACK_TYPE(enum nk, button_behavior, button_behavior);

NK_CONFIG_STACK(style_item, NK_STYLE_ITEM_STACK_SIZE);
NK_CONFIG_STACK(float, NK_FLOAT_STACK_SIZE);
NK_CONFIG_STACK(vec2, NK_VECTOR_STACK_SIZE);
NK_CONFIG_STACK(flags, NK_FLAGS_STACK_SIZE);
NK_CONFIG_STACK(color, NK_COLOR_STACK_SIZE);
NK_CONFIG_STACK(user_font, NK_FONT_STACK_SIZE);
NK_CONFIG_STACK(button_behavior, NK_BUTTON_BEHAVIOR_STACK_SIZE);

struct nk_configuration_stacks {
    struct nk_config_stack_style_item style_items;
    struct nk_config_stack_float floats;
    struct nk_config_stack_vec2 vectors;
    struct nk_config_stack_flags flags;
    struct nk_config_stack_color colors;
    struct nk_config_stack_user_font fonts;
    struct nk_config_stack_button_behavior button_behaviors;
};

/*==============================================================
 *                          CONTEXT
 * =============================================================*/
#define NK_VALUE_PAGE_CAPACITY \
    (((NK_MAX(sizeof(struct nk_window),sizeof(struct nk_panel)) / sizeof(nk_uint))) / 2)

struct nk_table {
    unsigned int seq;
    unsigned int size;
    nk_hash keys[NK_VALUE_PAGE_CAPACITY];
    nk_uint values[NK_VALUE_PAGE_CAPACITY];
    struct nk_table *next, *prev;
};

union nk_page_data {
    struct nk_table tbl;
    struct nk_panel pan;
    struct nk_window win;
};

struct nk_page_element {
    union nk_page_data data;
    struct nk_page_element *next;
    struct nk_page_element *prev;
};

struct nk_page {
    unsigned int size;
    struct nk_page *next;
    struct nk_page_element win[1];
};

struct nk_pool {
    struct nk_allocator alloc;
    enum nk_allocation_type type;
    unsigned int page_count;
    struct nk_page *pages;
    struct nk_page_element *freelist;
    unsigned capacity;
    nk_size size;
    nk_size cap;
};

struct nk_context {
/* public: can be accessed freely */
    struct nk_input input;
    struct nk_style style;
    struct nk_buffer memory;
    struct nk_clipboard clip;
    nk_flags last_widget_state;
    enum nk_button_behavior button_behavior;
    struct nk_configuration_stacks stacks;
    float delta_time_seconds;

/* private:
    should only be accessed if you
    know what you are doing */
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
    struct nk_draw_list draw_list;
#endif
#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_handle userdata;
#endif
    /* text editor objects are quite big because of an internal
     * undo/redo stack. Therefore it does not make sense to have one for
     * each window for temporary use cases, so I only provide *one* instance
     * for all windows. This works because the content is cleared anyway */
    struct nk_text_edit text_edit;
    /* draw buffer used for overlay drawing operation like cursor */
    struct nk_command_buffer overlay;

    /* windows */
    int build;
    int use_pool;
    struct nk_pool pool;
    struct nk_window *begin;
    struct nk_window *end;
    struct nk_window *active;
    struct nk_window *current;
    struct nk_page_element *freelist;
    unsigned int count;
    unsigned int seq;
};

/* ==============================================================
 *                          MATH
 * =============================================================== */
#define NK_PI 3.141592654f
#define NK_UTF_INVALID 0xFFFD
#define NK_MAX_FLOAT_PRECISION 2

#define NK_UNUSED(x) ((void)(x))
#define NK_SATURATE(x) (NK_MAX(0, NK_MIN(1.0f, x)))
#define NK_LEN(a) (sizeof(a)/sizeof(a)[0])
#define NK_ABS(a) (((a) < 0) ? -(a) : (a))
#define NK_BETWEEN(x, a, b) ((a) <= (x) && (x) < (b))
#define NK_INBOX(px, py, x, y, w, h)\
    (NK_BETWEEN(px,x,x+w) && NK_BETWEEN(py,y,y+h))
#define NK_INTERSECT(x0, y0, w0, h0, x1, y1, w1, h1) \
    (!(((x1 > (x0 + w0)) || ((x1 + w1) < x0) || (y1 > (y0 + h0)) || (y1 + h1) < y0)))
#define NK_CONTAINS(x, y, w, h, bx, by, bw, bh)\
    (NK_INBOX(x,y, bx, by, bw, bh) && NK_INBOX(x+w,y+h, bx, by, bw, bh))

#define nk_vec2_sub(a, b) nk_vec2((a).x - (b).x, (a).y - (b).y)
#define nk_vec2_add(a, b) nk_vec2((a).x + (b).x, (a).y + (b).y)
#define nk_vec2_len_sqr(a) ((a).x*(a).x+(a).y*(a).y)
#define nk_vec2_muls(a, t) nk_vec2((a).x * (t), (a).y * (t))

#define nk_ptr_add(t, p, i) ((t*)((void*)((nk_byte*)(p) + (i))))
#define nk_ptr_add_const(t, p, i) ((const t*)((const void*)((const nk_byte*)(p) + (i))))
#define nk_zero_struct(s) nk_zero(&s, sizeof(s))

/* ==============================================================
 *                          ALIGNMENT
 * =============================================================== */
/* Pointer to Integer type conversion for pointer alignment */
#if defined(__PTRDIFF_TYPE__) /* This case should work for GCC*/
# define NK_UINT_TO_PTR(x) ((void*)(__PTRDIFF_TYPE__)(x))
# define NK_PTR_TO_UINT(x) ((nk_size)(__PTRDIFF_TYPE__)(x))
#elif !defined(__GNUC__) /* works for compilers other than LLVM */
# define NK_UINT_TO_PTR(x) ((void*)&((char*)0)[x])
# define NK_PTR_TO_UINT(x) ((nk_size)(((char*)x)-(char*)0))
#elif defined(NK_USE_FIXED_TYPES) /* used if we have <stdint.h> */
# define NK_UINT_TO_PTR(x) ((void*)(uintptr_t)(x))
# define NK_PTR_TO_UINT(x) ((uintptr_t)(x))
#else /* generates warning but works */
# define NK_UINT_TO_PTR(x) ((void*)(x))
# define NK_PTR_TO_UINT(x) ((nk_size)(x))
#endif

#define NK_ALIGN_PTR(x, mask)\
    (NK_UINT_TO_PTR((NK_PTR_TO_UINT((nk_byte*)(x) + (mask-1)) & ~(mask-1))))
#define NK_ALIGN_PTR_BACK(x, mask)\
    (NK_UINT_TO_PTR((NK_PTR_TO_UINT((nk_byte*)(x)) & ~(mask-1))))

#define NK_OFFSETOF(st,m) ((nk_ptr)&(((st*)0)->m))
#define NK_CONTAINER_OF(ptr,type,member)\
    (type*)((void*)((char*)(1 ? (ptr): &((type*)0)->member) - NK_OFFSETOF(type, member)))

#ifdef __cplusplus
}
#endif

#ifdef __cplusplus
template<typename T> struct nk_alignof;
template<typename T, int size_diff> struct nk_helper{enum {value = size_diff};};
template<typename T> struct nk_helper<T,0>{enum {value = nk_alignof<T>::value};};
template<typename T> struct nk_alignof{struct Big {T x; char c;}; enum {
    diff = sizeof(Big) - sizeof(T), value = nk_helper<Big, diff>::value};};
#define NK_ALIGNOF(t) (nk_alignof<t>::value)
#elif defined(_MSC_VER)
#define NK_ALIGNOF(t) (__alignof(t))
#else
#define NK_ALIGNOF(t) ((char*)(&((struct {char c; t _h;}*)0)->_h) - (char*)0)
#endif

#endif /* NK_NUKLEAR_H_ */
/*
 * ==============================================================
 *
 *                          IMPLEMENTATION
 *
 * ===============================================================
 */
#ifdef NK_IMPLEMENTATION

#ifndef NK_POOL_DEFAULT_CAPACITY
#define NK_POOL_DEFAULT_CAPACITY 16
#endif

#ifndef NK_DEFAULT_COMMAND_BUFFER_SIZE
#define NK_DEFAULT_COMMAND_BUFFER_SIZE (4*1024)
#endif

#ifndef NK_BUFFER_DEFAULT_INITIAL_SIZE
#define NK_BUFFER_DEFAULT_INITIAL_SIZE (4*1024)
#endif

/* standard library headers */
#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
#include <stdlib.h> /* malloc, free */
#endif
#ifdef NK_INCLUDE_STANDARD_IO
#include <stdio.h> /* fopen, fclose,... */
#endif
#ifdef NK_INCLUDE_STANDARD_VARARGS
#include <stdarg.h> /* valist, va_start, va_end, ... */
#endif
#ifndef NK_ASSERT
#include <assert.h>
#define NK_ASSERT(expr) assert(expr)
#endif

#ifndef NK_MEMSET
#define NK_MEMSET nk_memset
#endif
#ifndef NK_MEMCPY
#define NK_MEMCPY nk_memcopy
#endif
#ifndef NK_SQRT
#define NK_SQRT nk_sqrt
#endif
#ifndef NK_SIN
#define NK_SIN nk_sin
#endif
#ifndef NK_COS
#define NK_COS nk_cos
#endif
#ifndef NK_STRTOD
#define NK_STRTOD nk_strtod
#endif
#ifndef NK_DTOA
#define NK_DTOA nk_dtoa
#endif

#define NK_DEFAULT (-1)

#ifndef NK_VSNPRINTF
/* If your compiler does support `vsnprintf` I would highly recommend
 * defining this to vsnprintf instead since `vsprintf` is basically
 * unbelievable unsafe and should *NEVER* be used. But I have to support
 * it since C89 only provides this unsafe version. */
  #if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) ||\
      (defined(__cplusplus) && (__cplusplus >= 201103L)) || \
      (defined(_POSIX_C_SOURCE) && (_POSIX_C_SOURCE >= 200112L)) ||\
      (defined(_XOPEN_SOURCE) && (_XOPEN_SOURCE >= 500)) ||\
       defined(_ISOC99_SOURCE) || defined(_BSD_SOURCE)
      #define NK_VSNPRINTF(s,n,f,a) vsnprintf(s,n,f,a)
  #else
    #define NK_VSNPRINTF(s,n,f,a) vsprintf(s,f,a)
  #endif
#endif

#define NK_SCHAR_MIN (-127)
#define NK_SCHAR_MAX 127
#define NK_UCHAR_MIN 0
#define NK_UCHAR_MAX 256
#define NK_SSHORT_MIN (-32767)
#define NK_SSHORT_MAX 32767
#define NK_USHORT_MIN 0
#define NK_USHORT_MAX 65535
#define NK_SINT_MIN (-2147483647)
#define NK_SINT_MAX 2147483647
#define NK_UINT_MIN 0
#define NK_UINT_MAX 4294967295u

/* Make sure correct type size:
 * This will fire with a negative subscript error if the type sizes
 * are set incorrectly by the compiler, and compile out if not */
NK_STATIC_ASSERT(sizeof(nk_size) >= sizeof(void*));
NK_STATIC_ASSERT(sizeof(nk_ptr) == sizeof(void*));
NK_STATIC_ASSERT(sizeof(nk_flags) >= 4);
NK_STATIC_ASSERT(sizeof(nk_rune) >= 4);
NK_STATIC_ASSERT(sizeof(nk_ushort) == 2);
NK_STATIC_ASSERT(sizeof(nk_short) == 2);
NK_STATIC_ASSERT(sizeof(nk_uint) == 4);
NK_STATIC_ASSERT(sizeof(nk_int) == 4);
NK_STATIC_ASSERT(sizeof(nk_byte) == 1);

NK_GLOBAL const struct nk_rect nk_null_rect = {-8192.0f, -8192.0f, 16384, 16384};
#define NK_FLOAT_PRECISION 0.00000000000001

NK_GLOBAL const struct nk_color nk_red = {255,0,0,255};
NK_GLOBAL const struct nk_color nk_green = {0,255,0,255};
NK_GLOBAL const struct nk_color nk_blue = {0,0,255,255};
NK_GLOBAL const struct nk_color nk_white = {255,255,255,255};
NK_GLOBAL const struct nk_color nk_black = {0,0,0,255};
NK_GLOBAL const struct nk_color nk_yellow = {255,255,0,255};

/*
 * ==============================================================
 *
 *                          MATH
 *
 * ===============================================================
 */
/*  Since nuklear is supposed to work on all systems providing floating point
    math without any dependencies I also had to implement my own math functions
    for sqrt, sin and cos. Since the actual highly accurate implementations for
    the standard library functions are quite complex and I do not need high
    precision for my use cases I use approximations.

    Sqrt
    ----
    For square root nuklear uses the famous fast inverse square root:
    https://en.wikipedia.org/wiki/Fast_inverse_square_root with
    slightly tweaked magic constant. While on today's hardware it is
    probably not faster it is still fast and accurate enough for
    nuklear's use cases. IMPORTANT: this requires float format IEEE 754

    Sine/Cosine
    -----------
    All constants inside both function are generated Remez's minimax
    approximations for value range 0...2*PI. The reason why I decided to
    approximate exactly that range is that nuklear only needs sine and
    cosine to generate circles which only requires that exact range.
    In addition I used Remez instead of Taylor for additional precision:
    www.lolengine.net/blog/2011/12/21/better-function-approximations.

    The tool I used to generate constants for both sine and cosine
    (it can actually approximate a lot more functions) can be
    found here: www.lolengine.net/wiki/oss/lolremez
*/
NK_INTERN float
nk_inv_sqrt(float number)
{
    float x2;
    const float threehalfs = 1.5f;
    union {nk_uint i; float f;} conv = {0};
    conv.f = number;
    x2 = number * 0.5f;
    conv.i = 0x5f375A84 - (conv.i >> 1);
    conv.f = conv.f * (threehalfs - (x2 * conv.f * conv.f));
    return conv.f;
}

NK_INTERN float
nk_sqrt(float x)
{
    return x * nk_inv_sqrt(x);
}

NK_INTERN float
nk_sin(float x)
{
    NK_STORAGE const float a0 = +1.91059300966915117e-31f;
    NK_STORAGE const float a1 = +1.00086760103908896f;
    NK_STORAGE const float a2 = -1.21276126894734565e-2f;
    NK_STORAGE const float a3 = -1.38078780785773762e-1f;
    NK_STORAGE const float a4 = -2.67353392911981221e-2f;
    NK_STORAGE const float a5 = +2.08026600266304389e-2f;
    NK_STORAGE const float a6 = -3.03996055049204407e-3f;
    NK_STORAGE const float a7 = +1.38235642404333740e-4f;
    return a0 + x*(a1 + x*(a2 + x*(a3 + x*(a4 + x*(a5 + x*(a6 + x*a7))))));
}

NK_INTERN float
nk_cos(float x)
{
    NK_STORAGE const float a0 = +1.00238601909309722f;
    NK_STORAGE const float a1 = -3.81919947353040024e-2f;
    NK_STORAGE const float a2 = -3.94382342128062756e-1f;
    NK_STORAGE const float a3 = -1.18134036025221444e-1f;
    NK_STORAGE const float a4 = +1.07123798512170878e-1f;
    NK_STORAGE const float a5 = -1.86637164165180873e-2f;
    NK_STORAGE const float a6 = +9.90140908664079833e-4f;
    NK_STORAGE const float a7 = -5.23022132118824778e-14f;
    return a0 + x*(a1 + x*(a2 + x*(a3 + x*(a4 + x*(a5 + x*(a6 + x*a7))))));
}

NK_INTERN nk_uint
nk_round_up_pow2(nk_uint v)
{
    v--;
    v |= v >> 1;
    v |= v >> 2;
    v |= v >> 4;
    v |= v >> 8;
    v |= v >> 16;
    v++;
    return v;
}

NK_API struct nk_rect
nk_get_null_rect(void)
{
    return nk_null_rect;
}

NK_API struct nk_rect
nk_rect(float x, float y, float w, float h)
{
    struct nk_rect r;
    r.x = x; r.y = y;
    r.w = w; r.h = h;
    return r;
}

NK_API struct nk_rect
nk_recti(int x, int y, int w, int h)
{
    struct nk_rect r;
    r.x = (float)x;
    r.y = (float)y;
    r.w = (float)w;
    r.h = (float)h;
    return r;
}

NK_API struct nk_rect
nk_recta(struct nk_vec2 pos, struct nk_vec2 size)
{
    return nk_rect(pos.x, pos.y, size.x, size.y);
}

NK_API struct nk_rect
nk_rectv(const float *r)
{
    return nk_rect(r[0], r[1], r[2], r[3]);
}

NK_API struct nk_rect
nk_rectiv(const int *r)
{
    return nk_recti(r[0], r[1], r[2], r[3]);
}

NK_API struct nk_vec2
nk_rect_pos(struct nk_rect r)
{
    struct nk_vec2 ret;
    ret.x = r.x; ret.y = r.y;
    return ret;
}

NK_API struct nk_vec2
nk_rect_size(struct nk_rect r)
{
    struct nk_vec2 ret;
    ret.x = r.w; ret.y = r.h;
    return ret;
}

NK_INTERN struct nk_rect
nk_shrink_rect(struct nk_rect r, float amount)
{
    struct nk_rect res;
    r.w = NK_MAX(r.w, 2 * amount);
    r.h = NK_MAX(r.h, 2 * amount);
    res.x = r.x + amount;
    res.y = r.y + amount;
    res.w = r.w - 2 * amount;
    res.h = r.h - 2 * amount;
    return res;
}

NK_INTERN struct nk_rect
nk_pad_rect(struct nk_rect r, struct nk_vec2 pad)
{
    r.w = NK_MAX(r.w, 2 * pad.x);
    r.h = NK_MAX(r.h, 2 * pad.y);
    r.x += pad.x; r.y += pad.y;
    r.w -= 2 * pad.x;
    r.h -= 2 * pad.y;
    return r;
}

NK_API struct nk_vec2
nk_vec2(float x, float y)
{
    struct nk_vec2 ret;
    ret.x = x; ret.y = y;
    return ret;
}

NK_API struct nk_vec2
nk_vec2i(int x, int y)
{
    struct nk_vec2 ret;
    ret.x = (float)x;
    ret.y = (float)y;
    return ret;
}

NK_API struct nk_vec2
nk_vec2v(const float *v)
{
    return nk_vec2(v[0], v[1]);
}

NK_API struct nk_vec2
nk_vec2iv(const int *v)
{
    return nk_vec2i(v[0], v[1]);
}

/*
 * ==============================================================
 *
 *                          UTIL
 *
 * ===============================================================
 */
NK_INTERN int nk_str_match_here(const char *regexp, const char *text);
NK_INTERN int nk_str_match_star(int c, const char *regexp, const char *text);
NK_INTERN int nk_is_lower(int c) {return (c >= 'a' && c <= 'z') || (c >= 0xE0 && c <= 0xFF);}
NK_INTERN int nk_is_upper(int c){return (c >= 'A' && c <= 'Z') || (c >= 0xC0 && c <= 0xDF);}
NK_INTERN int nk_to_upper(int c) {return (c >= 'a' && c <= 'z') ? (c - ('a' - 'A')) : c;}
NK_INTERN int nk_to_lower(int c) {return (c >= 'A' && c <= 'Z') ? (c - ('a' + 'A')) : c;}

NK_INTERN void*
nk_memcopy(void *dst0, const void *src0, nk_size length)
{
    nk_ptr t;
    char *dst = (char*)dst0;
    const char *src = (const char*)src0;
    if (length == 0 || dst == src)
        goto done;

    #define nk_word int
    #define nk_wsize sizeof(nk_word)
    #define nk_wmask (nk_wsize-1)
    #define NK_TLOOP(s) if (t) NK_TLOOP1(s)
    #define NK_TLOOP1(s) do { s; } while (--t)

    if (dst < src) {
        t = (nk_ptr)src; /* only need low bits */
        if ((t | (nk_ptr)dst) & nk_wmask) {
            if ((t ^ (nk_ptr)dst) & nk_wmask || length < nk_wsize)
                t = length;
            else
                t = nk_wsize - (t & nk_wmask);
            length -= t;
            NK_TLOOP1(*dst++ = *src++);
        }
        t = length / nk_wsize;
        NK_TLOOP(*(nk_word*)(void*)dst = *(const nk_word*)(const void*)src;
            src += nk_wsize; dst += nk_wsize);
        t = length & nk_wmask;
        NK_TLOOP(*dst++ = *src++);
    } else {
        src += length;
        dst += length;
        t = (nk_ptr)src;
        if ((t | (nk_ptr)dst) & nk_wmask) {
            if ((t ^ (nk_ptr)dst) & nk_wmask || length <= nk_wsize)
                t = length;
            else
                t &= nk_wmask;
            length -= t;
            NK_TLOOP1(*--dst = *--src);
        }
        t = length / nk_wsize;
        NK_TLOOP(src -= nk_wsize; dst -= nk_wsize;
            *(nk_word*)(void*)dst = *(const nk_word*)(const void*)src);
        t = length & nk_wmask;
        NK_TLOOP(*--dst = *--src);
    }
    #undef nk_word
    #undef nk_wsize
    #undef nk_wmask
    #undef NK_TLOOP
    #undef NK_TLOOP1
done:
    return (dst0);
}

NK_INTERN void
nk_memset(void *ptr, int c0, nk_size size)
{
    #define nk_word unsigned
    #define nk_wsize sizeof(nk_word)
    #define nk_wmask (nk_wsize - 1)
    nk_byte *dst = (nk_byte*)ptr;
    unsigned c = 0;
    nk_size t = 0;

    if ((c = (nk_byte)c0) != 0) {
        c = (c << 8) | c; /* at least 16-bits  */
        if (sizeof(unsigned int) > 2)
            c = (c << 16) | c; /* at least 32-bits*/
    }

    /* too small of a word count */
    dst = (nk_byte*)ptr;
    if (size < 3 * nk_wsize) {
        while (size--) *dst++ = (nk_byte)c0;
        return;
    }

    /* align destination */
    if ((t = NK_PTR_TO_UINT(dst) & nk_wmask) != 0) {
        t = nk_wsize -t;
        size -= t;
        do {
            *dst++ = (nk_byte)c0;
        } while (--t != 0);
    }

    /* fill word */
    t = size / nk_wsize;
    do {
        *(nk_word*)((void*)dst) = c;
        dst += nk_wsize;
    } while (--t != 0);

    /* fill trailing bytes */
    t = (size & nk_wmask);
    if (t != 0) {
        do {
            *dst++ = (nk_byte)c0;
        } while (--t != 0);
    }

    #undef nk_word
    #undef nk_wsize
    #undef nk_wmask
}

NK_INTERN void
nk_zero(void *ptr, nk_size size)
{
    NK_ASSERT(ptr);
    NK_MEMSET(ptr, 0, size);
}

NK_API int
nk_strlen(const char *str)
{
    int siz = 0;
    NK_ASSERT(str);
    while (str && *str++ != '\0') siz++;
    return siz;
}

NK_API int
nk_strtoi(const char *str, const char **endptr)
{
    int neg = 1;
    const char *p = str;
    int value = 0;

    NK_ASSERT(str);
    if (!str) return 0;

    /* skip whitespace */
    while (*p == ' ') p++;
    if (*p == '-') {
        neg = -1;
        p++;
    }
    while (*p && *p >= '0' && *p <= '9') {
        value = value * 10 + (int) (*p - '0');
        p++;
    }
    if (endptr)
        *endptr = p;
    return neg*value;
}

NK_API double
nk_strtod(const char *str, const char **endptr)
{
    double m;
    double neg = 1.0;
    const char *p = str;
    double value = 0;
    double number = 0;

    NK_ASSERT(str);
    if (!str) return 0;

    /* skip whitespace */
    while (*p == ' ') p++;
    if (*p == '-') {
        neg = -1.0;
        p++;
    }

    while (*p && *p != '.' && *p != 'e') {
        value = value * 10.0 + (double) (*p - '0');
        p++;
    }

    if (*p == '.') {
        p++;
        for(m = 0.1; *p && *p != 'e'; p++ ) {
            value = value + (double) (*p - '0') * m;
            m *= 0.1;
        }
    }
    if (*p == 'e') {
        int i, pow, div;
        p++;
        if (*p == '-') {
            div = nk_true;
            p++;
        } else if (*p == '+') {
            div = nk_false;
            p++;
        } else div = nk_false;

        for (pow = 0; *p; p++)
            pow = pow * 10 + (int) (*p - '0');

        for (m = 1.0, i = 0; i < pow; i++)
            m *= 10.0;

        if (div)
            value /= m;
        else value *= m;
    }
    number = value * neg;
    if (endptr)
        *endptr = p;
    return number;
}

NK_API float
nk_strtof(const char *str, const char **endptr)
{
    float float_value;
    double double_value;
    double_value = NK_STRTOD(str, endptr);
    float_value = (float)double_value;
    return float_value;
}

NK_API int
nk_stricmp(const char *s1, const char *s2)
{
    nk_int c1,c2,d;
    do {
        c1 = *s1++;
        c2 = *s2++;
        d = c1 - c2;
        while (d) {
            if (c1 <= 'Z' && c1 >= 'A') {
                d += ('a' - 'A');
                if (!d) break;
            }
            if (c2 <= 'Z' && c2 >= 'A') {
                d -= ('a' - 'A');
                if (!d) break;
            }
            return ((d >= 0) << 1) - 1;
        }
    } while (c1);
    return 0;
}

NK_API int
nk_stricmpn(const char *s1, const char *s2, int n)
{
    int c1,c2,d;
    NK_ASSERT(n >= 0);
    do {
        c1 = *s1++;
        c2 = *s2++;
        if (!n--) return 0;

        d = c1 - c2;
        while (d) {
            if (c1 <= 'Z' && c1 >= 'A') {
                d += ('a' - 'A');
                if (!d) break;
            }
            if (c2 <= 'Z' && c2 >= 'A') {
                d -= ('a' - 'A');
                if (!d) break;
            }
            return ((d >= 0) << 1) - 1;
        }
    } while (c1);
    return 0;
}

NK_INTERN int
nk_str_match_here(const char *regexp, const char *text)
{
    if (regexp[0] == '\0')
        return 1;
    if (regexp[1] == '*')
        return nk_str_match_star(regexp[0], regexp+2, text);
    if (regexp[0] == '$' && regexp[1] == '\0')
        return *text == '\0';
    if (*text!='\0' && (regexp[0]=='.' || regexp[0]==*text))
        return nk_str_match_here(regexp+1, text+1);
    return 0;
}

NK_INTERN int
nk_str_match_star(int c, const char *regexp, const char *text)
{
    do {/* a '* matches zero or more instances */
        if (nk_str_match_here(regexp, text))
            return 1;
    } while (*text != '\0' && (*text++ == c || c == '.'));
    return 0;
}

NK_API int
nk_strfilter(const char *text, const char *regexp)
{
    /*
    c    matches any literal character c
    .    matches any single character
    ^    matches the beginning of the input string
    $    matches the end of the input string
    *    matches zero or more occurrences of the previous character*/
    if (regexp[0] == '^')
        return nk_str_match_here(regexp+1, text);
    do {    /* must look even if string is empty */
        if (nk_str_match_here(regexp, text))
            return 1;
    } while (*text++ != '\0');
    return 0;
}

NK_API int
nk_strmatch_fuzzy_text(const char *str, int str_len,
    const char *pattern, int *out_score)
{
    /* Returns true if each character in pattern is found sequentially within str
     * if found then out_score is also set. Score value has no intrinsic meaning.
     * Range varies with pattern. Can only compare scores with same search pattern. */

    /* ------- scores --------- */
    /* bonus for adjacent matches */
    #define NK_ADJACENCY_BONUS 5
    /* bonus if match occurs after a separator */
    #define NK_SEPARATOR_BONUS 10
    /* bonus if match is uppercase and prev is lower */
    #define NK_CAMEL_BONUS 10
    /* penalty applied for every letter in str before the first match */
    #define NK_LEADING_LETTER_PENALTY (-3)
    /* maximum penalty for leading letters */
    #define NK_MAX_LEADING_LETTER_PENALTY (-9)
    /* penalty for every letter that doesn't matter */
    #define NK_UNMATCHED_LETTER_PENALTY (-1)

    /* loop variables */
    int score = 0;
    char const * pattern_iter = pattern;
    int str_iter = 0;
    int prev_matched = nk_false;
    int prev_lower = nk_false;
    /* true so if first letter match gets separator bonus*/
    int prev_separator = nk_true;

    /* use "best" matched letter if multiple string letters match the pattern */
    char const * best_letter = 0;
    int best_letter_score = 0;

    /* loop over strings */
    NK_ASSERT(str);
    NK_ASSERT(pattern);
    if (!str || !str_len || !pattern) return 0;
    while (str_iter < str_len)
    {
        const char pattern_letter = *pattern_iter;
        const char str_letter = str[str_iter];

        int next_match = *pattern_iter != '\0' &&
            nk_to_lower(pattern_letter) == nk_to_lower(str_letter);
        int rematch = best_letter && nk_to_upper(*best_letter) == nk_to_upper(str_letter);

        int advanced = next_match && best_letter;
        int pattern_repeat = best_letter && *pattern_iter != '\0';
        pattern_repeat = pattern_repeat &&
            nk_to_lower(*best_letter) == nk_to_lower(pattern_letter);

        if (advanced || pattern_repeat) {
            score += best_letter_score;
            best_letter = 0;
            best_letter_score = 0;
        }

        if (next_match || rematch)
        {
            int new_score = 0;
            /* Apply penalty for each letter before the first pattern match */
            if (pattern_iter == pattern) {
                int count = (int)(&str[str_iter] - str);
                int penalty = NK_LEADING_LETTER_PENALTY * count;
                if (penalty < NK_MAX_LEADING_LETTER_PENALTY)
                    penalty = NK_MAX_LEADING_LETTER_PENALTY;

                score += penalty;
            }

            /* apply bonus for consecutive bonuses */
            if (prev_matched)
                new_score += NK_ADJACENCY_BONUS;

            /* apply bonus for matches after a separator */
            if (prev_separator)
                new_score += NK_SEPARATOR_BONUS;

            /* apply bonus across camel case boundaries */
            if (prev_lower && nk_is_upper(str_letter))
                new_score += NK_CAMEL_BONUS;

            /* update pattern iter IFF the next pattern letter was matched */
            if (next_match)
                ++pattern_iter;

            /* update best letter in str which may be for a "next" letter or a rematch */
            if (new_score >= best_letter_score) {
                /* apply penalty for now skipped letter */
                if (best_letter != 0)
                    score += NK_UNMATCHED_LETTER_PENALTY;

                best_letter = &str[str_iter];
                best_letter_score = new_score;
            }
            prev_matched = nk_true;
        } else {
            score += NK_UNMATCHED_LETTER_PENALTY;
            prev_matched = nk_false;
        }

        /* separators should be more easily defined */
        prev_lower = nk_is_lower(str_letter) != 0;
        prev_separator = str_letter == '_' || str_letter == ' ';

        ++str_iter;
    }

    /* apply score for last match */
    if (best_letter)
        score += best_letter_score;

    /* did not match full pattern */
    if (*pattern_iter != '\0')
        return nk_false;

    if (out_score)
        *out_score = score;
    return nk_true;
}

NK_API int
nk_strmatch_fuzzy_string(char const *str, char const *pattern, int *out_score)
{return nk_strmatch_fuzzy_text(str, nk_strlen(str), pattern, out_score);}

NK_INTERN int
nk_string_float_limit(char *string, int prec)
{
    int dot = 0;
    char *c = string;
    while (*c) {
        if (*c == '.') {
            dot = 1;
            c++;
            continue;
        }
        if (dot == (prec+1)) {
            *c = 0;
            break;
        }
        if (dot > 0) dot++;
        c++;
    }
    return (int)(c - string);
}

NK_INTERN double
nk_pow(double x, int n)
{
    /*  check the sign of n */
    double r = 1;
    int plus = n >= 0;
    n = (plus) ? n : -n;
    while (n > 0) {
        if ((n & 1) == 1)
            r *= x;
        n /= 2;
        x *= x;
    }
    return plus ? r : 1.0 / r;
}

NK_INTERN int
nk_ifloord(double x)
{
    x = (double)((int)x - ((x < 0.0) ? 1 : 0));
    return (int)x;
}

NK_INTERN int
nk_ifloorf(float x)
{
    x = (float)((int)x - ((x < 0.0f) ? 1 : 0));
    return (int)x;
}

NK_INTERN int
nk_iceilf(float x)
{
    if (x >= 0) {
        int i = (int)x;
        return (x > i) ? i+1: i;
    } else {
        int t = (int)x;
        float r = x - (float)t;
        return (r > 0.0f) ? t+1: t;
    }
}

NK_INTERN int
nk_log10(double n)
{
    int neg;
    int ret;
    int exp = 0;

    neg = (n < 0) ? 1 : 0;
    ret = (neg) ? (int)-n : (int)n;
    while ((ret / 10) > 0) {
        ret /= 10;
        exp++;
    }
    if (neg) exp = -exp;
    return exp;
}

NK_INTERN void
nk_strrev_ascii(char *s)
{
    int len = nk_strlen(s);
    int end = len / 2;
    int i = 0;
    char t;
    for (; i < end; ++i) {
        t = s[i];
        s[i] = s[len - 1 - i];
        s[len -1 - i] = t;
    }
}

NK_INTERN char*
nk_itoa(char *s, long n)
{
    long i = 0;
    if (n == 0) {
        s[i++] = '0';
        s[i] = 0;
        return s;
    }
    if (n < 0) {
        s[i++] = '-';
        n = -n;
    }
    while (n > 0) {
        s[i++] = (char)('0' + (n % 10));
        n /= 10;
    }
    s[i] = 0;
    if (s[0] == '-')
        ++s;

    nk_strrev_ascii(s);
    return s;
}

NK_INTERN char*
nk_dtoa(char *s, double n)
{
    int useExp = 0;
    int digit = 0, m = 0, m1 = 0;
    char *c = s;
    int neg = 0;

    NK_ASSERT(s);
    if (!s) return 0;

    if (n == 0.0) {
        s[0] = '0'; s[1] = '\0';
        return s;
    }

    neg = (n < 0);
    if (neg) n = -n;

    /* calculate magnitude */
    m = nk_log10(n);
    useExp = (m >= 14 || (neg && m >= 9) || m <= -9);
    if (neg) *(c++) = '-';

    /* set up for scientific notation */
    if (useExp) {
        if (m < 0)
           m -= 1;
        n = n / (double)nk_pow(10.0, m);
        m1 = m;
        m = 0;
    }
    if (m < 1.0) {
        m = 0;
    }

    /* convert the number */
    while (n > NK_FLOAT_PRECISION || m >= 0) {
        double weight = nk_pow(10.0, m);
        if (weight > 0) {
            double t = (double)n / weight;
            digit = nk_ifloord(t);
            n -= ((double)digit * weight);
            *(c++) = (char)('0' + (char)digit);
        }
        if (m == 0 && n > 0)
            *(c++) = '.';
        m--;
    }

    if (useExp) {
        /* convert the exponent */
        int i, j;
        *(c++) = 'e';
        if (m1 > 0) {
            *(c++) = '+';
        } else {
            *(c++) = '-';
            m1 = -m1;
        }
        m = 0;
        while (m1 > 0) {
            *(c++) = (char)('0' + (char)(m1 % 10));
            m1 /= 10;
            m++;
        }
        c -= m;
        for (i = 0, j = m-1; i<j; i++, j--) {
            /* swap without temporary */
            c[i] ^= c[j];
            c[j] ^= c[i];
            c[i] ^= c[j];
        }
        c += m;
    }
    *(c) = '\0';
    return s;
}

#ifdef NK_INCLUDE_STANDARD_VARARGS
#ifndef NK_INCLUDE_STANDARD_IO
static int
nk_vsnprintf(char *buf, int buf_size, const char *fmt, va_list args)
{
    enum nk_arg_type {
        NK_ARG_TYPE_CHAR,
        NK_ARG_TYPE_SHORT,
        NK_ARG_TYPE_DEFAULT,
        NK_ARG_TYPE_LONG
    };
    enum nk_arg_flags {
        NK_ARG_FLAG_LEFT = 0x01,
        NK_ARG_FLAG_PLUS = 0x02,
        NK_ARG_FLAG_SPACE = 0x04,
        NK_ARG_FLAG_NUM = 0x10,
        NK_ARG_FLAG_ZERO = 0x20
    };

    char number_buffer[NK_MAX_NUMBER_BUFFER];
    enum nk_arg_type arg_type = NK_ARG_TYPE_DEFAULT;
    int precision = NK_DEFAULT;
    int width = NK_DEFAULT;
    nk_flags flag = 0;

    int len = 0;
    int result = -1;
    const char *iter = fmt;

    NK_ASSERT(buf);
    NK_ASSERT(buf_size);
    if (!buf || !buf_size || !fmt) return 0;
    for (iter = fmt; *iter && len < buf_size; iter++) {
        /* copy all non-format characters */
        while (*iter && (*iter != '%') && (len < buf_size))
            buf[len++] = *iter++;
        if (!(*iter) || len >= buf_size) break;
        iter++;

        /* flag arguments */
        while (*iter) {
            if (*iter == '-') flag |= NK_ARG_FLAG_LEFT;
            else if (*iter == '+') flag |= NK_ARG_FLAG_PLUS;
            else if (*iter == ' ') flag |= NK_ARG_FLAG_SPACE;
            else if (*iter == '#') flag |= NK_ARG_FLAG_NUM;
            else if (*iter == '0') flag |= NK_ARG_FLAG_ZERO;
            else break;
            iter++;
        }

        /* width argument */
        width = NK_DEFAULT;
        if (*iter >= '1' && *iter <= '9') {
            const char *end;
            width = nk_strtoi(iter, &end);
            if (end == iter)
                width = -1;
            else iter = end;
        } else if (*iter == '*') {
            width = va_arg(args, int);
            iter++;
        }

        /* precision argument */
        precision = NK_DEFAULT;
        if (*iter == '.') {
            iter++;
            if (*iter == '*') {
                precision = va_arg(args, int);
                iter++;
            } else {
                const char *end;
                precision = nk_strtoi(iter, &end);
                if (end == iter)
                    precision = -1;
                else iter = end;
            }
        }

        /* length modifier */
        if (*iter == 'h') {
            if (*(iter+1) == 'h') {
                arg_type = NK_ARG_TYPE_CHAR;
                iter++;
            } else arg_type = NK_ARG_TYPE_SHORT;
            iter++;
        } else if (*iter == 'l') {
            arg_type = NK_ARG_TYPE_LONG;
            iter++;
        } else arg_type = NK_ARG_TYPE_DEFAULT;

        /* specifier */
        if (*iter == '%') {
            NK_ASSERT(arg_type == NK_ARG_TYPE_DEFAULT);
            NK_ASSERT(precision == NK_DEFAULT);
            NK_ASSERT(width == NK_DEFAULT);
            if (len < buf_size)
                buf[len++] = '%';
        } else if (*iter == 's') {
            /* string  */
            const char *str = va_arg(args, const char*);
            NK_ASSERT(str != buf && "buffer and argument are not allowed to overlap!");
            NK_ASSERT(arg_type == NK_ARG_TYPE_DEFAULT);
            NK_ASSERT(precision == NK_DEFAULT);
            NK_ASSERT(width == NK_DEFAULT);
            if (str == buf) return -1;
            while (str && *str && len < buf_size)
                buf[len++] = *str++;
        } else if (*iter == 'n') {
            /* current length callback */
            signed int *n = va_arg(args, int*);
            NK_ASSERT(arg_type == NK_ARG_TYPE_DEFAULT);
            NK_ASSERT(precision == NK_DEFAULT);
            NK_ASSERT(width == NK_DEFAULT);
            if (n) *n = len;
        } else if (*iter == 'c' || *iter == 'i' || *iter == 'd') {
            /* signed integer */
            long value = 0;
            const char *num_iter;
            int num_len, num_print, padding;
            int cur_precision = NK_MAX(precision, 1);
            int cur_width = NK_MAX(width, 0);

            /* retrieve correct value type */
            if (arg_type == NK_ARG_TYPE_CHAR)
                value = (signed char)va_arg(args, int);
            else if (arg_type == NK_ARG_TYPE_SHORT)
                value = (signed short)va_arg(args, int);
            else if (arg_type == NK_ARG_TYPE_LONG)
                value = va_arg(args, signed long);
            else if (*iter == 'c')
                value = (unsigned char)va_arg(args, int);
            else value = va_arg(args, signed int);

            /* convert number to string */
            nk_itoa(number_buffer, value);
            num_len = nk_strlen(number_buffer);
            padding = NK_MAX(cur_width - NK_MAX(cur_precision, num_len), 0);
            if ((flag & NK_ARG_FLAG_PLUS) || (flag & NK_ARG_FLAG_SPACE))
                padding = NK_MAX(padding-1, 0);

            /* fill left padding up to a total of `width` characters */
            if (!(flag & NK_ARG_FLAG_LEFT)) {
                while (padding-- > 0 && (len < buf_size)) {
                    if ((flag & NK_ARG_FLAG_ZERO) && (precision == NK_DEFAULT))
                        buf[len++] = '0';
                    else buf[len++] = ' ';
                }
            }

            /* copy string value representation into buffer */
            if ((flag & NK_ARG_FLAG_PLUS) && value >= 0 && len < buf_size)
                buf[len++] = '+';
            else if ((flag & NK_ARG_FLAG_SPACE) && value >= 0 && len < buf_size)
                buf[len++] = ' ';

            /* fill up to precision number of digits with '0' */
            num_print = NK_MAX(cur_precision, num_len);
            while (precision && (num_print > num_len) && (len < buf_size)) {
                buf[len++] = '0';
                num_print--;
            }

            /* copy string value representation into buffer */
            num_iter = number_buffer;
            while (precision && *num_iter && len < buf_size)
                buf[len++] = *num_iter++;

            /* fill right padding up to width characters */
            if (flag & NK_ARG_FLAG_LEFT) {
                while ((padding-- > 0) && (len < buf_size))
                    buf[len++] = ' ';
            }
        } else if (*iter == 'o' || *iter == 'x' || *iter == 'X' || *iter == 'u') {
            /* unsigned integer */
            unsigned long value = 0;
            int num_len = 0, num_print, padding = 0;
            int cur_precision = NK_MAX(precision, 1);
            int cur_width = NK_MAX(width, 0);
            unsigned int base = (*iter == 'o') ? 8: (*iter == 'u')? 10: 16;

            /* print oct/hex/dec value */
            const char *upper_output_format = "0123456789ABCDEF";
            const char *lower_output_format = "0123456789abcdef";
            const char *output_format = (*iter == 'x') ?
                lower_output_format: upper_output_format;

            /* retrieve correct value type */
            if (arg_type == NK_ARG_TYPE_CHAR)
                value = (unsigned char)va_arg(args, int);
            else if (arg_type == NK_ARG_TYPE_SHORT)
                value = (unsigned short)va_arg(args, int);
            else if (arg_type == NK_ARG_TYPE_LONG)
                value = va_arg(args, unsigned long);
            else value = va_arg(args, unsigned int);

            do {
                /* convert decimal number into hex/oct number */
                int digit = output_format[value % base];
                if (num_len < NK_MAX_NUMBER_BUFFER)
                    number_buffer[num_len++] = (char)digit;
                value /= base;
            } while (value > 0);

            num_print = NK_MAX(cur_precision, num_len);
            padding = NK_MAX(cur_width - NK_MAX(cur_precision, num_len), 0);
            if (flag & NK_ARG_FLAG_NUM)
                padding = NK_MAX(padding-1, 0);

            /* fill left padding up to a total of `width` characters */
            if (!(flag & NK_ARG_FLAG_LEFT)) {
                while ((padding-- > 0) && (len < buf_size)) {
                    if ((flag & NK_ARG_FLAG_ZERO) && (precision == NK_DEFAULT))
                        buf[len++] = '0';
                    else buf[len++] = ' ';
                }
            }

            /* fill up to precision number of digits */
            if (num_print && (flag & NK_ARG_FLAG_NUM)) {
                if ((*iter == 'o') && (len < buf_size)) {
                    buf[len++] = '0';
                } else if ((*iter == 'x') && ((len+1) < buf_size)) {
                    buf[len++] = '0';
                    buf[len++] = 'x';
                } else if ((*iter == 'X') && ((len+1) < buf_size)) {
                    buf[len++] = '0';
                    buf[len++] = 'X';
                }
            }
            while (precision && (num_print > num_len) && (len < buf_size)) {
                buf[len++] = '0';
                num_print--;
            }

            /* reverse number direction */
            while (num_len > 0) {
                if (precision && (len < buf_size))
                    buf[len++] = number_buffer[num_len-1];
                num_len--;
            }

            /* fill right padding up to width characters */
            if (flag & NK_ARG_FLAG_LEFT) {
                while ((padding-- > 0) && (len < buf_size))
                    buf[len++] = ' ';
            }
        } else if (*iter == 'f') {
            /* floating point */
            const char *num_iter;
            int cur_precision = (precision < 0) ? 6: precision;
            int prefix, cur_width = NK_MAX(width, 0);
            double value = va_arg(args, double);
            int num_len = 0, frac_len = 0, dot = 0;
            int padding = 0;

            NK_ASSERT(arg_type == NK_ARG_TYPE_DEFAULT);
            NK_DTOA(number_buffer, value);
            num_len = nk_strlen(number_buffer);

            /* calculate padding */
            num_iter = number_buffer;
            while (*num_iter && *num_iter != '.')
                num_iter++;

            prefix = (*num_iter == '.')?(int)(num_iter - number_buffer)+1:0;
            padding = NK_MAX(cur_width - (prefix + NK_MIN(cur_precision, num_len - prefix)) , 0);
            if ((flag & NK_ARG_FLAG_PLUS) || (flag & NK_ARG_FLAG_SPACE))
                padding = NK_MAX(padding-1, 0);

            /* fill left padding up to a total of `width` characters */
            if (!(flag & NK_ARG_FLAG_LEFT)) {
                while (padding-- > 0 && (len < buf_size)) {
                    if (flag & NK_ARG_FLAG_ZERO)
                        buf[len++] = '0';
                    else buf[len++] = ' ';
                }
            }

            /* copy string value representation into buffer */
            num_iter = number_buffer;
            if ((flag & NK_ARG_FLAG_PLUS) && (value >= 0) && (len < buf_size))
                buf[len++] = '+';
            else if ((flag & NK_ARG_FLAG_SPACE) && (value >= 0) && (len < buf_size))
                buf[len++] = ' ';
            while (*num_iter) {
                if (dot) frac_len++;
                if (len < buf_size)
                    buf[len++] = *num_iter;
                if (*num_iter == '.') dot = 1;
                if (frac_len >= cur_precision) break;
                num_iter++;
            }

            /* fill number up to precision */
            while (frac_len < cur_precision) {
                if (!dot && len < buf_size) {
                    buf[len++] = '.';
                    dot = 1;
                }
                if (len < buf_size)
                    buf[len++] = '0';
                frac_len++;
            }

            /* fill right padding up to width characters */
            if (flag & NK_ARG_FLAG_LEFT) {
                while ((padding-- > 0) && (len < buf_size))
                    buf[len++] = ' ';
            }
        } else {
            /* Specifier not supported: g,G,e,E,p,z */
            NK_ASSERT(0 && "specifier is not supported!");
            return result;
        }
    }
    buf[(len >= buf_size)?(buf_size-1):len] = 0;
    result = (len >= buf_size)?-1:len;
    return result;
}
#endif

NK_INTERN int
nk_strfmt(char *buf, int buf_size, const char *fmt, va_list args)
{
    int result = -1;
    NK_ASSERT(buf);
    NK_ASSERT(buf_size);
    if (!buf || !buf_size || !fmt) return 0;
#ifdef NK_INCLUDE_STANDARD_IO
    result = NK_VSNPRINTF(buf, (nk_size)buf_size, fmt, args);
    result = (result >= buf_size) ? -1: result;
    buf[buf_size-1] = 0;
#else
    result = nk_vsnprintf(buf, buf_size, fmt, args);
#endif
    return result;
}
#endif

NK_API nk_hash
nk_murmur_hash(const void * key, int len, nk_hash seed)
{
    /* 32-Bit MurmurHash3: https://code.google.com/p/smhasher/wiki/MurmurHash3*/
    #define NK_ROTL(x,r) ((x) << (r) | ((x) >> (32 - r)))
    union {const nk_uint *i; const nk_byte *b;} conv = {0};
    const nk_byte *data = (const nk_byte*)key;
    const int nblocks = len/4;
    nk_uint h1 = seed;
    const nk_uint c1 = 0xcc9e2d51;
    const nk_uint c2 = 0x1b873593;
    const nk_byte *tail;
    const nk_uint *blocks;
    nk_uint k1;
    int i;

    /* body */
    if (!key) return 0;
    conv.b = (data + nblocks*4);
    blocks = (const nk_uint*)conv.i;
    for (i = -nblocks; i; ++i) {
        k1 = blocks[i];
        k1 *= c1;
        k1 = NK_ROTL(k1,15);
        k1 *= c2;

        h1 ^= k1;
        h1 = NK_ROTL(h1,13);
        h1 = h1*5+0xe6546b64;
    }

    /* tail */
    tail = (const nk_byte*)(data + nblocks*4);
    k1 = 0;
    switch (len & 3) {
    case 3: k1 ^= (nk_uint)(tail[2] << 16);
    case 2: k1 ^= (nk_uint)(tail[1] << 8u);
    case 1: k1 ^= tail[0];
            k1 *= c1;
            k1 = NK_ROTL(k1,15);
            k1 *= c2;
            h1 ^= k1;
    default: break;
    }

    /* finalization */
    h1 ^= (nk_uint)len;
    /* fmix32 */
    h1 ^= h1 >> 16;
    h1 *= 0x85ebca6b;
    h1 ^= h1 >> 13;
    h1 *= 0xc2b2ae35;
    h1 ^= h1 >> 16;

    #undef NK_ROTL
    return h1;
}

#ifdef NK_INCLUDE_STANDARD_IO
NK_INTERN char*
nk_file_load(const char* path, nk_size* siz, struct nk_allocator *alloc)
{
    char *buf;
    FILE *fd;
    long ret;

    NK_ASSERT(path);
    NK_ASSERT(siz);
    NK_ASSERT(alloc);
    if (!path || !siz || !alloc)
        return 0;

    fd = fopen(path, "rb");
    if (!fd) return 0;
    fseek(fd, 0, SEEK_END);
    ret = ftell(fd);
    if (ret < 0) {
        fclose(fd);
        return 0;
    }
    *siz = (nk_size)ret;
    fseek(fd, 0, SEEK_SET);
    buf = (char*)alloc->alloc(alloc->userdata,0, *siz);
    NK_ASSERT(buf);
    if (!buf) {
        fclose(fd);
        return 0;
    }
    *siz = (nk_size)fread(buf, *siz, 1, fd);
    fclose(fd);
    return buf;
}
#endif

/*
 * ==============================================================
 *
 *                          COLOR
 *
 * ===============================================================
 */
NK_INTERN int
nk_parse_hex(const char *p, int length)
{
    int i = 0;
    int len = 0;
    while (len < length) {
        i <<= 4;
        if (p[len] >= 'a' && p[len] <= 'f')
            i += ((p[len] - 'a') + 10);
        else if (p[len] >= 'A' && p[len] <= 'F')
            i += ((p[len] - 'A') + 10);
        else i += (p[len] - '0');
        len++;
    }
    return i;
}

NK_API struct nk_color
nk_rgba(int r, int g, int b, int a)
{
    struct nk_color ret;
    ret.r = (nk_byte)NK_CLAMP(0, r, 255);
    ret.g = (nk_byte)NK_CLAMP(0, g, 255);
    ret.b = (nk_byte)NK_CLAMP(0, b, 255);
    ret.a = (nk_byte)NK_CLAMP(0, a, 255);
    return ret;
}

NK_API struct nk_color
nk_rgb_hex(const char *rgb)
{
    struct nk_color col;
    const char *c = rgb;
    if (*c == '#') c++;
    col.r = (nk_byte)nk_parse_hex(c, 2);
    col.g = (nk_byte)nk_parse_hex(c+2, 2);
    col.b = (nk_byte)nk_parse_hex(c+4, 2);
    col.a = 255;
    return col;
}

NK_API struct nk_color
nk_rgba_hex(const char *rgb)
{
    struct nk_color col;
    const char *c = rgb;
    if (*c == '#') c++;
    col.r = (nk_byte)nk_parse_hex(c, 2);
    col.g = (nk_byte)nk_parse_hex(c+2, 2);
    col.b = (nk_byte)nk_parse_hex(c+4, 2);
    col.a = (nk_byte)nk_parse_hex(c+6, 2);
    return col;
}

NK_API void
nk_color_hex_rgba(char *output, struct nk_color col)
{
    #define NK_TO_HEX(i) ((i) <= 9 ? '0' + (i): 'A' - 10 + (i))
    output[0] = (char)NK_TO_HEX((col.r & 0xF0) >> 4);
    output[1] = (char)NK_TO_HEX((col.r & 0x0F));
    output[2] = (char)NK_TO_HEX((col.g & 0xF0) >> 4);
    output[3] = (char)NK_TO_HEX((col.g & 0x0F));
    output[4] = (char)NK_TO_HEX((col.b & 0xF0) >> 4);
    output[5] = (char)NK_TO_HEX((col.b & 0x0F));
    output[6] = (char)NK_TO_HEX((col.a & 0xF0) >> 4);
    output[7] = (char)NK_TO_HEX((col.a & 0x0F));
    output[8] = '\0';
    #undef NK_TO_HEX
}

NK_API void
nk_color_hex_rgb(char *output, struct nk_color col)
{
    #define NK_TO_HEX(i) ((i) <= 9 ? '0' + (i): 'A' - 10 + (i))
    output[0] = (char)NK_TO_HEX((col.r & 0xF0) >> 4);
    output[1] = (char)NK_TO_HEX((col.r & 0x0F));
    output[2] = (char)NK_TO_HEX((col.g & 0xF0) >> 4);
    output[3] = (char)NK_TO_HEX((col.g & 0x0F));
    output[4] = (char)NK_TO_HEX((col.b & 0xF0) >> 4);
    output[5] = (char)NK_TO_HEX((col.b & 0x0F));
    output[6] = '\0';
    #undef NK_TO_HEX
}

NK_API struct nk_color
nk_rgba_iv(const int *c)
{
    return nk_rgba(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_rgba_bv(const nk_byte *c)
{
    return nk_rgba(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_rgb(int r, int g, int b)
{
    struct nk_color ret;
    ret.r = (nk_byte)NK_CLAMP(0, r, 255);
    ret.g = (nk_byte)NK_CLAMP(0, g, 255);
    ret.b = (nk_byte)NK_CLAMP(0, b, 255);
    ret.a = (nk_byte)255;
    return ret;
}

NK_API struct nk_color
nk_rgb_iv(const int *c)
{
    return nk_rgb(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_rgb_bv(const nk_byte* c)
{
    return nk_rgb(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_rgba_u32(nk_uint in)
{
    struct nk_color ret;
    ret.r = (in & 0xFF);
    ret.g = ((in >> 8) & 0xFF);
    ret.b = ((in >> 16) & 0xFF);
    ret.a = (nk_byte)((in >> 24) & 0xFF);
    return ret;
}

NK_API struct nk_color
nk_rgba_f(float r, float g, float b, float a)
{
    struct nk_color ret;
    ret.r = (nk_byte)(NK_SATURATE(r) * 255.0f);
    ret.g = (nk_byte)(NK_SATURATE(g) * 255.0f);
    ret.b = (nk_byte)(NK_SATURATE(b) * 255.0f);
    ret.a = (nk_byte)(NK_SATURATE(a) * 255.0f);
    return ret;
}

NK_API struct nk_color
nk_rgba_fv(const float *c)
{
    return nk_rgba_f(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_rgb_f(float r, float g, float b)
{
    struct nk_color ret;
    ret.r = (nk_byte)(NK_SATURATE(r) * 255.0f);
    ret.g = (nk_byte)(NK_SATURATE(g) * 255.0f);
    ret.b = (nk_byte)(NK_SATURATE(b) * 255.0f);
    ret.a = 255;
    return ret;
}

NK_API struct nk_color
nk_rgb_fv(const float *c)
{
    return nk_rgb_f(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_hsv(int h, int s, int v)
{
    return nk_hsva(h, s, v, 255);
}

NK_API struct nk_color
nk_hsv_iv(const int *c)
{
    return nk_hsv(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_hsv_bv(const nk_byte *c)
{
    return nk_hsv(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_hsv_f(float h, float s, float v)
{
    return nk_hsva_f(h, s, v, 1.0f);
}

NK_API struct nk_color
nk_hsv_fv(const float *c)
{
    return nk_hsv_f(c[0], c[1], c[2]);
}

NK_API struct nk_color
nk_hsva(int h, int s, int v, int a)
{
    float hf = ((float)NK_CLAMP(0, h, 255)) / 255.0f;
    float sf = ((float)NK_CLAMP(0, s, 255)) / 255.0f;
    float vf = ((float)NK_CLAMP(0, v, 255)) / 255.0f;
    float af = ((float)NK_CLAMP(0, a, 255)) / 255.0f;
    return nk_hsva_f(hf, sf, vf, af);
}

NK_API struct nk_color
nk_hsva_iv(const int *c)
{
    return nk_hsva(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_hsva_bv(const nk_byte *c)
{
    return nk_hsva(c[0], c[1], c[2], c[3]);
}

NK_API struct nk_color
nk_hsva_f(float h, float s, float v, float a)
{
    struct nk_colorf out = {0,0,0,0};
    float p, q, t, f;
    int i;

    if (s <= 0.0f) {
        out.r = v; out.g = v; out.b = v;
        return nk_rgb_f(out.r, out.g, out.b);
    }

    h = h / (60.0f/360.0f);
    i = (int)h;
    f = h - (float)i;
    p = v * (1.0f - s);
    q = v * (1.0f - (s * f));
    t = v * (1.0f - s * (1.0f - f));

    switch (i) {
    case 0: default: out.r = v; out.g = t; out.b = p; break;
    case 1: out.r = q; out.g = v; out.b = p; break;
    case 2: out.r = p; out.g = v; out.b = t; break;
    case 3: out.r = p; out.g = q; out.b = v; break;
    case 4: out.r = t; out.g = p; out.b = v; break;
    case 5: out.r = v; out.g = p; out.b = q; break;
    }
    return nk_rgba_f(out.r, out.g, out.b, a);
}

NK_API struct nk_color
nk_hsva_fv(const float *c)
{
    return nk_hsva_f(c[0], c[1], c[2], c[3]);
}

NK_API nk_uint
nk_color_u32(struct nk_color in)
{
    nk_uint out = (nk_uint)in.r;
    out |= ((nk_uint)in.g << 8);
    out |= ((nk_uint)in.b << 16);
    out |= ((nk_uint)in.a << 24);
    return out;
}

NK_API void
nk_color_f(float *r, float *g, float *b, float *a, struct nk_color in)
{
    NK_STORAGE const float s = 1.0f/255.0f;
    *r = (float)in.r * s;
    *g = (float)in.g * s;
    *b = (float)in.b * s;
    *a = (float)in.a * s;
}

NK_API void
nk_color_fv(float *c, struct nk_color in)
{
    nk_color_f(&c[0], &c[1], &c[2], &c[3], in);
}

NK_API void
nk_color_d(double *r, double *g, double *b, double *a, struct nk_color in)
{
    NK_STORAGE const double s = 1.0/255.0;
    *r = (double)in.r * s;
    *g = (double)in.g * s;
    *b = (double)in.b * s;
    *a = (double)in.a * s;
}

NK_API void
nk_color_dv(double *c, struct nk_color in)
{
    nk_color_d(&c[0], &c[1], &c[2], &c[3], in);
}

NK_API void
nk_color_hsv_f(float *out_h, float *out_s, float *out_v, struct nk_color in)
{
    float a;
    nk_color_hsva_f(out_h, out_s, out_v, &a, in);
}

NK_API void
nk_color_hsv_fv(float *out, struct nk_color in)
{
    float a;
    nk_color_hsva_f(&out[0], &out[1], &out[2], &a, in);
}

NK_API void
nk_color_hsva_f(float *out_h, float *out_s,
    float *out_v, float *out_a, struct nk_color in)
{
    float chroma;
    float K = 0.0f;
    float r,g,b,a;

    nk_color_f(&r,&g,&b,&a, in);
    if (g < b) {
        const float t = g; g = b; b = t;
        K = -1.f;
    }
    if (r < g) {
        const float t = r; r = g; g = t;
        K = -2.f/6.0f - K;
    }
    chroma = r - ((g < b) ? g: b);
    *out_h = NK_ABS(K + (g - b)/(6.0f * chroma + 1e-20f));
    *out_s = chroma / (r + 1e-20f);
    *out_v = r;
    *out_a = (float)in.a / 255.0f;
}

NK_API void
nk_color_hsva_fv(float *out, struct nk_color in)
{
    nk_color_hsva_f(&out[0], &out[1], &out[2], &out[3], in);
}

NK_API void
nk_color_hsva_i(int *out_h, int *out_s, int *out_v,
                int *out_a, struct nk_color in)
{
    float h,s,v,a;
    nk_color_hsva_f(&h, &s, &v, &a, in);
    *out_h = (nk_byte)(h * 255.0f);
    *out_s = (nk_byte)(s * 255.0f);
    *out_v = (nk_byte)(v * 255.0f);
    *out_a = (nk_byte)(a * 255.0f);
}

NK_API void
nk_color_hsva_iv(int *out, struct nk_color in)
{
    nk_color_hsva_i(&out[0], &out[1], &out[2], &out[3], in);
}

NK_API void
nk_color_hsva_bv(nk_byte *out, struct nk_color in)
{
    int tmp[4];
    nk_color_hsva_i(&tmp[0], &tmp[1], &tmp[2], &tmp[3], in);
    out[0] = (nk_byte)tmp[0];
    out[1] = (nk_byte)tmp[1];
    out[2] = (nk_byte)tmp[2];
    out[3] = (nk_byte)tmp[3];
}

NK_API void
nk_color_hsva_b(nk_byte *h, nk_byte *s, nk_byte *v, nk_byte *a, struct nk_color in)
{
    int tmp[4];
    nk_color_hsva_i(&tmp[0], &tmp[1], &tmp[2], &tmp[3], in);
    *h = (nk_byte)tmp[0];
    *s = (nk_byte)tmp[1];
    *v = (nk_byte)tmp[2];
    *a = (nk_byte)tmp[3];
}

NK_API void
nk_color_hsv_i(int *out_h, int *out_s, int *out_v, struct nk_color in)
{
    int a;
    nk_color_hsva_i(out_h, out_s, out_v, &a, in);
}

NK_API void
nk_color_hsv_b(nk_byte *out_h, nk_byte *out_s, nk_byte *out_v, struct nk_color in)
{
    int tmp[4];
    nk_color_hsva_i(&tmp[0], &tmp[1], &tmp[2], &tmp[3], in);
    *out_h = (nk_byte)tmp[0];
    *out_s = (nk_byte)tmp[1];
    *out_v = (nk_byte)tmp[2];
}

NK_API void
nk_color_hsv_iv(int *out, struct nk_color in)
{
    nk_color_hsv_i(&out[0], &out[1], &out[2], in);
}

NK_API void
nk_color_hsv_bv(nk_byte *out, struct nk_color in)
{
    int tmp[4];
    nk_color_hsv_i(&tmp[0], &tmp[1], &tmp[2], in);
    out[0] = (nk_byte)tmp[0];
    out[1] = (nk_byte)tmp[1];
    out[2] = (nk_byte)tmp[2];
}
/*
 * ==============================================================
 *
 *                          IMAGE
 *
 * ===============================================================
 */
NK_API nk_handle
nk_handle_ptr(void *ptr)
{
    nk_handle handle = {0};
    handle.ptr = ptr;
    return handle;
}

NK_API nk_handle
nk_handle_id(int id)
{
    nk_handle handle;
    nk_zero_struct(handle);
    handle.id = id;
    return handle;
}

NK_API struct nk_image
nk_subimage_ptr(void *ptr, unsigned short w, unsigned short h, struct nk_rect r)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    s.handle.ptr = ptr;
    s.w = w; s.h = h;
    s.region[0] = (unsigned short)r.x;
    s.region[1] = (unsigned short)r.y;
    s.region[2] = (unsigned short)r.w;
    s.region[3] = (unsigned short)r.h;
    return s;
}

NK_API struct nk_image
nk_subimage_id(int id, unsigned short w, unsigned short h, struct nk_rect r)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    s.handle.id = id;
    s.w = w; s.h = h;
    s.region[0] = (unsigned short)r.x;
    s.region[1] = (unsigned short)r.y;
    s.region[2] = (unsigned short)r.w;
    s.region[3] = (unsigned short)r.h;
    return s;
}

NK_API struct nk_image
nk_subimage_handle(nk_handle handle, unsigned short w, unsigned short h,
    struct nk_rect r)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    s.handle = handle;
    s.w = w; s.h = h;
    s.region[0] = (unsigned short)r.x;
    s.region[1] = (unsigned short)r.y;
    s.region[2] = (unsigned short)r.w;
    s.region[3] = (unsigned short)r.h;
    return s;
}

NK_API struct nk_image
nk_image_handle(nk_handle handle)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    s.handle = handle;
    s.w = 0; s.h = 0;
    s.region[0] = 0;
    s.region[1] = 0;
    s.region[2] = 0;
    s.region[3] = 0;
    return s;
}

NK_API struct nk_image
nk_image_ptr(void *ptr)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    NK_ASSERT(ptr);
    s.handle.ptr = ptr;
    s.w = 0; s.h = 0;
    s.region[0] = 0;
    s.region[1] = 0;
    s.region[2] = 0;
    s.region[3] = 0;
    return s;
}

NK_API struct nk_image
nk_image_id(int id)
{
    struct nk_image s;
    nk_zero(&s, sizeof(s));
    s.handle.id = id;
    s.w = 0; s.h = 0;
    s.region[0] = 0;
    s.region[1] = 0;
    s.region[2] = 0;
    s.region[3] = 0;
    return s;
}

NK_API int
nk_image_is_subimage(const struct nk_image* img)
{
    NK_ASSERT(img);
    return !(img->w == 0 && img->h == 0);
}

NK_INTERN void
nk_unify(struct nk_rect *clip, const struct nk_rect *a, float x0, float y0,
    float x1, float y1)
{
    NK_ASSERT(a);
    NK_ASSERT(clip);
    clip->x = NK_MAX(a->x, x0);
    clip->y = NK_MAX(a->y, y0);
    clip->w = NK_MIN(a->x + a->w, x1) - clip->x;
    clip->h = NK_MIN(a->y + a->h, y1) - clip->y;
    clip->w = NK_MAX(0, clip->w);
    clip->h = NK_MAX(0, clip->h);
}

NK_API void
nk_triangle_from_direction(struct nk_vec2 *result, struct nk_rect r,
    float pad_x, float pad_y, enum nk_heading direction)
{
    float w_half, h_half;
    NK_ASSERT(result);

    r.w = NK_MAX(2 * pad_x, r.w);
    r.h = NK_MAX(2 * pad_y, r.h);
    r.w = r.w - 2 * pad_x;
    r.h = r.h - 2 * pad_y;

    r.x = r.x + pad_x;
    r.y = r.y + pad_y;

    w_half = r.w / 2.0f;
    h_half = r.h / 2.0f;

    if (direction == NK_UP) {
        result[0] = nk_vec2(r.x + w_half, r.y);
        result[1] = nk_vec2(r.x + r.w, r.y + r.h);
        result[2] = nk_vec2(r.x, r.y + r.h);
    } else if (direction == NK_RIGHT) {
        result[0] = nk_vec2(r.x, r.y);
        result[1] = nk_vec2(r.x + r.w, r.y + h_half);
        result[2] = nk_vec2(r.x, r.y + r.h);
    } else if (direction == NK_DOWN) {
        result[0] = nk_vec2(r.x, r.y);
        result[1] = nk_vec2(r.x + r.w, r.y);
        result[2] = nk_vec2(r.x + w_half, r.y + r.h);
    } else {
        result[0] = nk_vec2(r.x, r.y + h_half);
        result[1] = nk_vec2(r.x + r.w, r.y);
        result[2] = nk_vec2(r.x + r.w, r.y + r.h);
    }
}

NK_INTERN int
nk_text_clamp(const struct nk_user_font *font, const char *text,
    int text_len, float space, int *glyphs, float *text_width,
    nk_rune *sep_list, int sep_count)
{
    int i = 0;
    int glyph_len = 0;
    float last_width = 0;
    nk_rune unicode = 0;
    float width = 0;
    int len = 0;
    int g = 0;
    float s;

    int sep_len = 0;
    int sep_g = 0;
    float sep_width = 0;
    sep_count = NK_MAX(sep_count,0);

    glyph_len = nk_utf_decode(text, &unicode, text_len);
    while (glyph_len && (width < space) && (len < text_len)) {
        len += glyph_len;
        s = font->width(font->userdata, font->height, text, len);
        for (i = 0; i < sep_count; ++i) {
            if (unicode != sep_list[i]) continue;
            sep_width = last_width = width;
            sep_g = g+1;
            sep_len = len;
            break;
        }
        if (i == sep_count){
            last_width = sep_width = width;
            sep_g = g+1;
        }
        width = s;
        glyph_len = nk_utf_decode(&text[len], &unicode, text_len - len);
        g++;
    }
    if (len >= text_len) {
        *glyphs = g;
        *text_width = last_width;
        return len;
    } else {
        *glyphs = sep_g;
        *text_width = sep_width;
        return (!sep_len) ? len: sep_len;
    }
}

enum {NK_DO_NOT_STOP_ON_NEW_LINE, NK_STOP_ON_NEW_LINE};
NK_INTERN struct nk_vec2
nk_text_calculate_text_bounds(const struct nk_user_font *font,
    const char *begin, int byte_len, float row_height, const char **remaining,
    struct nk_vec2 *out_offset, int *glyphs, int op)
{
    float line_height = row_height;
    struct nk_vec2 text_size = nk_vec2(0,0);
    float line_width = 0.0f;

    float glyph_width;
    int glyph_len = 0;
    nk_rune unicode = 0;
    int text_len = 0;
    if (!begin || byte_len <= 0 || !font)
        return nk_vec2(0,row_height);

    glyph_len = nk_utf_decode(begin, &unicode, byte_len);
    if (!glyph_len) return text_size;
    glyph_width = font->width(font->userdata, font->height, begin, glyph_len);

    *glyphs = 0;
    while ((text_len < byte_len) && glyph_len) {
        if (unicode == '\n') {
            text_size.x = NK_MAX(text_size.x, line_width);
            text_size.y += line_height;
            line_width = 0;
            *glyphs+=1;
            if (op == NK_STOP_ON_NEW_LINE)
                break;

            text_len++;
            glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
            continue;
        }

        if (unicode == '\r') {
            text_len++;
            *glyphs+=1;
            glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
            continue;
        }

        *glyphs = *glyphs + 1;
        text_len += glyph_len;
        line_width += (float)glyph_width;
        glyph_len = nk_utf_decode(begin + text_len, &unicode, byte_len-text_len);
        glyph_width = font->width(font->userdata, font->height, begin+text_len, glyph_len);
        continue;
    }

    if (text_size.x < line_width)
        text_size.x = line_width;
    if (out_offset)
        *out_offset = nk_vec2(line_width, text_size.y + line_height);
    if (line_width > 0 || text_size.y == 0.0f)
        text_size.y += line_height;
    if (remaining)
        *remaining = begin+text_len;
    return text_size;
}

/* ==============================================================
 *
 *                          UTF-8
 *
 * ===============================================================*/
NK_GLOBAL const nk_byte nk_utfbyte[NK_UTF_SIZE+1] = {0x80, 0, 0xC0, 0xE0, 0xF0};
NK_GLOBAL const nk_byte nk_utfmask[NK_UTF_SIZE+1] = {0xC0, 0x80, 0xE0, 0xF0, 0xF8};
NK_GLOBAL const nk_uint nk_utfmin[NK_UTF_SIZE+1] = {0, 0, 0x80, 0x800, 0x10000};
NK_GLOBAL const nk_uint nk_utfmax[NK_UTF_SIZE+1] = {0x10FFFF, 0x7F, 0x7FF, 0xFFFF, 0x10FFFF};

NK_INTERN int
nk_utf_validate(nk_rune *u, int i)
{
    NK_ASSERT(u);
    if (!u) return 0;
    if (!NK_BETWEEN(*u, nk_utfmin[i], nk_utfmax[i]) ||
         NK_BETWEEN(*u, 0xD800, 0xDFFF))
            *u = NK_UTF_INVALID;
    for (i = 1; *u > nk_utfmax[i]; ++i);
    return i;
}

NK_INTERN nk_rune
nk_utf_decode_byte(char c, int *i)
{
    NK_ASSERT(i);
    if (!i) return 0;
    for(*i = 0; *i < (int)NK_LEN(nk_utfmask); ++(*i)) {
        if (((nk_byte)c & nk_utfmask[*i]) == nk_utfbyte[*i])
            return (nk_byte)(c & ~nk_utfmask[*i]);
    }
    return 0;
}

NK_API int
nk_utf_decode(const char *c, nk_rune *u, int clen)
{
    int i, j, len, type=0;
    nk_rune udecoded;

    NK_ASSERT(c);
    NK_ASSERT(u);

    if (!c || !u) return 0;
    if (!clen) return 0;
    *u = NK_UTF_INVALID;

    udecoded = nk_utf_decode_byte(c[0], &len);
    if (!NK_BETWEEN(len, 1, NK_UTF_SIZE))
        return 1;

    for (i = 1, j = 1; i < clen && j < len; ++i, ++j) {
        udecoded = (udecoded << 6) | nk_utf_decode_byte(c[i], &type);
        if (type != 0)
            return j;
    }
    if (j < len)
        return 0;
    *u = udecoded;
    nk_utf_validate(u, len);
    return len;
}

NK_INTERN char
nk_utf_encode_byte(nk_rune u, int i)
{
    return (char)((nk_utfbyte[i]) | ((nk_byte)u & ~nk_utfmask[i]));
}

NK_API int
nk_utf_encode(nk_rune u, char *c, int clen)
{
    int len, i;
    len = nk_utf_validate(&u, 0);
    if (clen < len || !len || len > NK_UTF_SIZE)
        return 0;

    for (i = len - 1; i != 0; --i) {
        c[i] = nk_utf_encode_byte(u, 0);
        u >>= 6;
    }
    c[0] = nk_utf_encode_byte(u, len);
    return len;
}

NK_API int
nk_utf_len(const char *str, int len)
{
    const char *text;
    int glyphs = 0;
    int text_len;
    int glyph_len;
    int src_len = 0;
    nk_rune unicode;

    NK_ASSERT(str);
    if (!str || !len) return 0;

    text = str;
    text_len = len;
    glyph_len = nk_utf_decode(text, &unicode, text_len);
    while (glyph_len && src_len < len) {
        glyphs++;
        src_len = src_len + glyph_len;
        glyph_len = nk_utf_decode(text + src_len, &unicode, text_len - src_len);
    }
    return glyphs;
}

NK_API const char*
nk_utf_at(const char *buffer, int length, int index,
    nk_rune *unicode, int *len)
{
    int i = 0;
    int src_len = 0;
    int glyph_len = 0;
    const char *text;
    int text_len;

    NK_ASSERT(buffer);
    NK_ASSERT(unicode);
    NK_ASSERT(len);

    if (!buffer || !unicode || !len) return 0;
    if (index < 0) {
        *unicode = NK_UTF_INVALID;
        *len = 0;
        return 0;
    }

    text = buffer;
    text_len = length;
    glyph_len = nk_utf_decode(text, unicode, text_len);
    while (glyph_len) {
        if (i == index) {
            *len = glyph_len;
            break;
        }

        i++;
        src_len = src_len + glyph_len;
        glyph_len = nk_utf_decode(text + src_len, unicode, text_len - src_len);
    }
    if (i != index) return 0;
    return buffer + src_len;
}

/* ==============================================================
 *
 *                          BUFFER
 *
 * ===============================================================*/
#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_INTERN void* nk_malloc(nk_handle unused, void *old,nk_size size)
{NK_UNUSED(unused); NK_UNUSED(old); return malloc(size);}
NK_INTERN void nk_mfree(nk_handle unused, void *ptr)
{NK_UNUSED(unused); free(ptr);}

NK_API void
nk_buffer_init_default(struct nk_buffer *buffer)
{
    struct nk_allocator alloc;
    alloc.userdata.ptr = 0;
    alloc.alloc = nk_malloc;
    alloc.free = nk_mfree;
    nk_buffer_init(buffer, &alloc, NK_BUFFER_DEFAULT_INITIAL_SIZE);
}
#endif

NK_API void
nk_buffer_init(struct nk_buffer *b, const struct nk_allocator *a,
    nk_size initial_size)
{
    NK_ASSERT(b);
    NK_ASSERT(a);
    NK_ASSERT(initial_size);
    if (!b || !a || !initial_size) return;

    nk_zero(b, sizeof(*b));
    b->type = NK_BUFFER_DYNAMIC;
    b->memory.ptr = a->alloc(a->userdata,0, initial_size);
    b->memory.size = initial_size;
    b->size = initial_size;
    b->grow_factor = 2.0f;
    b->pool = *a;
}

NK_API void
nk_buffer_init_fixed(struct nk_buffer *b, void *m, nk_size size)
{
    NK_ASSERT(b);
    NK_ASSERT(m);
    NK_ASSERT(size);
    if (!b || !m || !size) return;

    nk_zero(b, sizeof(*b));
    b->type = NK_BUFFER_FIXED;
    b->memory.ptr = m;
    b->memory.size = size;
    b->size = size;
}

NK_INTERN void*
nk_buffer_align(void *unaligned, nk_size align, nk_size *alignment,
    enum nk_buffer_allocation_type type)
{
    void *memory = 0;
    switch (type) {
    default:
    case NK_BUFFER_MAX:
    case NK_BUFFER_FRONT:
        if (align) {
            memory = NK_ALIGN_PTR(unaligned, align);
            *alignment = (nk_size)((nk_byte*)memory - (nk_byte*)unaligned);
        } else {
            memory = unaligned;
            *alignment = 0;
        }
        break;
    case NK_BUFFER_BACK:
        if (align) {
            memory = NK_ALIGN_PTR_BACK(unaligned, align);
            *alignment = (nk_size)((nk_byte*)unaligned - (nk_byte*)memory);
        } else {
            memory = unaligned;
            *alignment = 0;
        }
        break;
    }
    return memory;
}

NK_INTERN void*
nk_buffer_realloc(struct nk_buffer *b, nk_size capacity, nk_size *size)
{
    void *temp;
    nk_size buffer_size;

    NK_ASSERT(b);
    NK_ASSERT(size);
    if (!b || !size || !b->pool.alloc || !b->pool.free)
        return 0;

    buffer_size = b->memory.size;
    temp = b->pool.alloc(b->pool.userdata, b->memory.ptr, capacity);
    NK_ASSERT(temp);
    if (!temp) return 0;

    *size = capacity;
    if (temp != b->memory.ptr) {
        NK_MEMCPY(temp, b->memory.ptr, buffer_size);
        b->pool.free(b->pool.userdata, b->memory.ptr);
    }

    if (b->size == buffer_size) {
        /* no back buffer so just set correct size */
        b->size = capacity;
        return temp;
    } else {
        /* copy back buffer to the end of the new buffer */
        void *dst, *src;
        nk_size back_size;
        back_size = buffer_size - b->size;
        dst = nk_ptr_add(void, temp, capacity - back_size);
        src = nk_ptr_add(void, temp, b->size);
        NK_MEMCPY(dst, src, back_size);
        b->size = capacity - back_size;
    }
    return temp;
}

NK_INTERN void*
nk_buffer_alloc(struct nk_buffer *b, enum nk_buffer_allocation_type type,
    nk_size size, nk_size align)
{
    int full;
    nk_size alignment;
    void *unaligned;
    void *memory;

    NK_ASSERT(b);
    NK_ASSERT(size);
    if (!b || !size) return 0;
    b->needed += size;

    /* calculate total size with needed alignment + size */
    if (type == NK_BUFFER_FRONT)
        unaligned = nk_ptr_add(void, b->memory.ptr, b->allocated);
    else unaligned = nk_ptr_add(void, b->memory.ptr, b->size - size);
    memory = nk_buffer_align(unaligned, align, &alignment, type);

    /* check if buffer has enough memory*/
    if (type == NK_BUFFER_FRONT)
        full = ((b->allocated + size + alignment) > b->size);
    else full = ((b->size - NK_MIN(b->size,(size + alignment))) <= b->allocated);

    if (full) {
        nk_size capacity;
        if (b->type != NK_BUFFER_DYNAMIC)
            return 0;
        NK_ASSERT(b->pool.alloc && b->pool.free);
        if (b->type != NK_BUFFER_DYNAMIC || !b->pool.alloc || !b->pool.free)
            return 0;

        /* buffer is full so allocate bigger buffer if dynamic */
        capacity = (nk_size)((float)b->memory.size * b->grow_factor);
        capacity = NK_MAX(capacity, nk_round_up_pow2((nk_uint)(b->allocated + size)));
        b->memory.ptr = nk_buffer_realloc(b, capacity, &b->memory.size);
        if (!b->memory.ptr) return 0;

        /* align newly allocated pointer */
        if (type == NK_BUFFER_FRONT)
            unaligned = nk_ptr_add(void, b->memory.ptr, b->allocated);
        else unaligned = nk_ptr_add(void, b->memory.ptr, b->size - size);
        memory = nk_buffer_align(unaligned, align, &alignment, type);
    }
    if (type == NK_BUFFER_FRONT)
        b->allocated += size + alignment;
    else b->size -= (size + alignment);
    b->needed += alignment;
    b->calls++;
    return memory;
}

NK_API void
nk_buffer_push(struct nk_buffer *b, enum nk_buffer_allocation_type type,
    const void *memory, nk_size size, nk_size align)
{
    void *mem = nk_buffer_alloc(b, type, size, align);
    if (!mem) return;
    NK_MEMCPY(mem, memory, size);
}

NK_API void
nk_buffer_mark(struct nk_buffer *buffer, enum nk_buffer_allocation_type type)
{
    NK_ASSERT(buffer);
    if (!buffer) return;
    buffer->marker[type].active = nk_true;
    if (type == NK_BUFFER_BACK)
        buffer->marker[type].offset = buffer->size;
    else buffer->marker[type].offset = buffer->allocated;
}

NK_API void
nk_buffer_reset(struct nk_buffer *buffer, enum nk_buffer_allocation_type type)
{
    NK_ASSERT(buffer);
    if (!buffer) return;
    if (type == NK_BUFFER_BACK) {
        /* reset back buffer either back to marker or empty */
        buffer->needed -= (buffer->memory.size - buffer->marker[type].offset);
        if (buffer->marker[type].active)
            buffer->size = buffer->marker[type].offset;
        else buffer->size = buffer->memory.size;
        buffer->marker[type].active = nk_false;
    } else {
        /* reset front buffer either back to back marker or empty */
        buffer->needed -= (buffer->allocated - buffer->marker[type].offset);
        if (buffer->marker[type].active)
            buffer->allocated = buffer->marker[type].offset;
        else buffer->allocated = 0;
        buffer->marker[type].active = nk_false;
    }
}

NK_API void
nk_buffer_clear(struct nk_buffer *b)
{
    NK_ASSERT(b);
    if (!b) return;
    b->allocated = 0;
    b->size = b->memory.size;
    b->calls = 0;
    b->needed = 0;
}

NK_API void
nk_buffer_free(struct nk_buffer *b)
{
    NK_ASSERT(b);
    if (!b || !b->memory.ptr) return;
    if (b->type == NK_BUFFER_FIXED) return;
    if (!b->pool.free) return;
    NK_ASSERT(b->pool.free);
    b->pool.free(b->pool.userdata, b->memory.ptr);
}

NK_API void
nk_buffer_info(struct nk_memory_status *s, struct nk_buffer *b)
{
    NK_ASSERT(b);
    NK_ASSERT(s);
    if (!s || !b) return;
    s->allocated = b->allocated;
    s->size =  b->memory.size;
    s->needed = b->needed;
    s->memory = b->memory.ptr;
    s->calls = b->calls;
}

NK_API void*
nk_buffer_memory(struct nk_buffer *buffer)
{
    NK_ASSERT(buffer);
    if (!buffer) return 0;
    return buffer->memory.ptr;
}

NK_API const void*
nk_buffer_memory_const(const struct nk_buffer *buffer)
{
    NK_ASSERT(buffer);
    if (!buffer) return 0;
    return buffer->memory.ptr;
}

NK_API nk_size
nk_buffer_total(struct nk_buffer *buffer)
{
    NK_ASSERT(buffer);
    if (!buffer) return 0;
    return buffer->memory.size;
}

/*
 * ==============================================================
 *
 *                          STRING
 *
 * ===============================================================
 */
#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void
nk_str_init_default(struct nk_str *str)
{
    struct nk_allocator alloc;
    alloc.userdata.ptr = 0;
    alloc.alloc = nk_malloc;
    alloc.free = nk_mfree;
    nk_buffer_init(&str->buffer, &alloc, 32);
    str->len = 0;
}
#endif

NK_API void
nk_str_init(struct nk_str *str, const struct nk_allocator *alloc, nk_size size)
{
    nk_buffer_init(&str->buffer, alloc, size);
    str->len = 0;
}

NK_API void
nk_str_init_fixed(struct nk_str *str, void *memory, nk_size size)
{
    nk_buffer_init_fixed(&str->buffer, memory, size);
    str->len = 0;
}

NK_API int
nk_str_append_text_char(struct nk_str *s, const char *str, int len)
{
    char *mem;
    NK_ASSERT(s);
    NK_ASSERT(str);
    if (!s || !str || !len) return 0;
    mem = (char*)nk_buffer_alloc(&s->buffer, NK_BUFFER_FRONT, (nk_size)len * sizeof(char), 0);
    if (!mem) return 0;
    NK_MEMCPY(mem, str, (nk_size)len * sizeof(char));
    s->len += nk_utf_len(str, len);
    return len;
}

NK_API int
nk_str_append_str_char(struct nk_str *s, const char *str)
{
    return nk_str_append_text_char(s, str, nk_strlen(str));
}

NK_API int
nk_str_append_text_utf8(struct nk_str *str, const char *text, int len)
{
    int i = 0;
    int byte_len = 0;
    nk_rune unicode;
    if (!str || !text || !len) return 0;
    for (i = 0; i < len; ++i)
        byte_len += nk_utf_decode(text+byte_len, &unicode, 4);
    nk_str_append_text_char(str, text, byte_len);
    return len;
}

NK_API int
nk_str_append_str_utf8(struct nk_str *str, const char *text)
{
    int runes = 0;
    int byte_len = 0;
    int num_runes = 0;
    int glyph_len = 0;
    nk_rune unicode;
    if (!str || !text) return 0;

    glyph_len = byte_len = nk_utf_decode(text+byte_len, &unicode, 4);
    while (unicode != '\0' && glyph_len) {
        glyph_len = nk_utf_decode(text+byte_len, &unicode, 4);
        byte_len += glyph_len;
        num_runes++;
    }
    nk_str_append_text_char(str, text, byte_len);
    return runes;
}

NK_API int
nk_str_append_text_runes(struct nk_str *str, const nk_rune *text, int len)
{
    int i = 0;
    int byte_len = 0;
    nk_glyph glyph;

    NK_ASSERT(str);
    if (!str || !text || !len) return 0;
    for (i = 0; i < len; ++i) {
        byte_len = nk_utf_encode(text[i], glyph, NK_UTF_SIZE);
        if (!byte_len) break;
        nk_str_append_text_char(str, glyph, byte_len);
    }
    return len;
}

NK_API int
nk_str_append_str_runes(struct nk_str *str, const nk_rune *runes)
{
    int i = 0;
    nk_glyph glyph;
    int byte_len;
    NK_ASSERT(str);
    if (!str || !runes) return 0;
    while (runes[i] != '\0') {
        byte_len = nk_utf_encode(runes[i], glyph, NK_UTF_SIZE);
        nk_str_append_text_char(str, glyph, byte_len);
        i++;
    }
    return i;
}

NK_API int
nk_str_insert_at_char(struct nk_str *s, int pos, const char *str, int len)
{
    int i;
    void *mem;
    char *src;
    char *dst;

    int copylen;
    NK_ASSERT(s);
    NK_ASSERT(str);
    NK_ASSERT(len >= 0);
    if (!s || !str || !len || (nk_size)pos > s->buffer.allocated) return 0;
    if ((s->buffer.allocated + (nk_size)len >= s->buffer.memory.size) &&
        (s->buffer.type == NK_BUFFER_FIXED)) return 0;

    copylen = (int)s->buffer.allocated - pos;
    if (!copylen) {
        nk_str_append_text_char(s, str, len);
        return 1;
    }
    mem = nk_buffer_alloc(&s->buffer, NK_BUFFER_FRONT, (nk_size)len * sizeof(char), 0);
    if (!mem) return 0;

    /* memmove */
    NK_ASSERT(((int)pos + (int)len + ((int)copylen - 1)) >= 0);
    NK_ASSERT(((int)pos + ((int)copylen - 1)) >= 0);
    dst = nk_ptr_add(char, s->buffer.memory.ptr, pos + len + (copylen - 1));
    src = nk_ptr_add(char, s->buffer.memory.ptr, pos + (copylen-1));
    for (i = 0; i < copylen; ++i) *dst-- = *src--;
    mem = nk_ptr_add(void, s->buffer.memory.ptr, pos);
    NK_MEMCPY(mem, str, (nk_size)len * sizeof(char));
    s->len = nk_utf_len((char *)s->buffer.memory.ptr, (int)s->buffer.allocated);
    return 1;
}

NK_API int
nk_str_insert_at_rune(struct nk_str *str, int pos, const char *cstr, int len)
{
    int glyph_len;
    nk_rune unicode;
    const char *begin;
    const char *buffer;

    NK_ASSERT(str);
    NK_ASSERT(cstr);
    NK_ASSERT(len);
    if (!str || !cstr || !len) return 0;
    begin = nk_str_at_rune(str, pos, &unicode, &glyph_len);
    if (!str->len)
        return nk_str_append_text_char(str, cstr, len);
    buffer = nk_str_get_const(str);
    if (!begin) return 0;
    return nk_str_insert_at_char(str, (int)(begin - buffer), cstr, len);
}

NK_API int
nk_str_insert_text_char(struct nk_str *str, int pos, const char *text, int len)
{
    return nk_str_insert_text_utf8(str, pos, text, len);
}

NK_API int
nk_str_insert_str_char(struct nk_str *str, int pos, const char *text)
{
    return nk_str_insert_text_utf8(str, pos, text, nk_strlen(text));
}

NK_API int
nk_str_insert_text_utf8(struct nk_str *str, int pos, const char *text, int len)
{
    int i = 0;
    int byte_len = 0;
    nk_rune unicode;

    NK_ASSERT(str);
    NK_ASSERT(text);
    if (!str || !text || !len) return 0;
    for (i = 0; i < len; ++i)
        byte_len += nk_utf_decode(text+byte_len, &unicode, 4);
    nk_str_insert_at_rune(str, pos, text, byte_len);
    return len;
}

NK_API int
nk_str_insert_str_utf8(struct nk_str *str, int pos, const char *text)
{
    int runes = 0;
    int byte_len = 0;
    int num_runes = 0;
    int glyph_len = 0;
    nk_rune unicode;
    if (!str || !text) return 0;

    glyph_len = byte_len = nk_utf_decode(text+byte_len, &unicode, 4);
    while (unicode != '\0' && glyph_len) {
        glyph_len = nk_utf_decode(text+byte_len, &unicode, 4);
        byte_len += glyph_len;
        num_runes++;
    }
    nk_str_insert_at_rune(str, pos, text, byte_len);
    return runes;
}

NK_API int
nk_str_insert_text_runes(struct nk_str *str, int pos, const nk_rune *runes, int len)
{
    int i = 0;
    int byte_len = 0;
    nk_glyph glyph;

    NK_ASSERT(str);
    if (!str || !runes || !len) return 0;
    for (i = 0; i < len; ++i) {
        byte_len = nk_utf_encode(runes[i], glyph, NK_UTF_SIZE);
        if (!byte_len) break;
        nk_str_insert_at_rune(str, pos+i, glyph, byte_len);
    }
    return len;
}

NK_API int
nk_str_insert_str_runes(struct nk_str *str, int pos, const nk_rune *runes)
{
    int i = 0;
    nk_glyph glyph;
    int byte_len;
    NK_ASSERT(str);
    if (!str || !runes) return 0;
    while (runes[i] != '\0') {
        byte_len = nk_utf_encode(runes[i], glyph, NK_UTF_SIZE);
        nk_str_insert_at_rune(str, pos+i, glyph, byte_len);
        i++;
    }
    return i;
}

NK_API void
nk_str_remove_chars(struct nk_str *s, int len)
{
    NK_ASSERT(s);
    NK_ASSERT(len >= 0);
    if (!s || len < 0 || (nk_size)len > s->buffer.allocated) return;
    NK_ASSERT(((int)s->buffer.allocated - (int)len) >= 0);
    s->buffer.allocated -= (nk_size)len;
    s->len = nk_utf_len((char *)s->buffer.memory.ptr, (int)s->buffer.allocated);
}

NK_API void
nk_str_remove_runes(struct nk_str *str, int len)
{
    int index;
    const char *begin;
    const char *end;
    nk_rune unicode;

    NK_ASSERT(str);
    NK_ASSERT(len >= 0);
    if (!str || len < 0) return;
    if (len >= str->len) {
        str->len = 0;
        return;
    }

    index = str->len - len;
    begin = nk_str_at_rune(str, index, &unicode, &len);
    end = (const char*)str->buffer.memory.ptr + str->buffer.allocated;
    nk_str_remove_chars(str, (int)(end-begin)+1);
}

NK_API void
nk_str_delete_chars(struct nk_str *s, int pos, int len)
{
    NK_ASSERT(s);
    if (!s || !len || (nk_size)pos > s->buffer.allocated ||
        (nk_size)(pos + len) > s->buffer.allocated) return;

    if ((nk_size)(pos + len) < s->buffer.allocated) {
        /* memmove */
        char *dst = nk_ptr_add(char, s->buffer.memory.ptr, pos);
        char *src = nk_ptr_add(char, s->buffer.memory.ptr, pos + len);
        NK_MEMCPY(dst, src, s->buffer.allocated - (nk_size)(pos + len));
        NK_ASSERT(((int)s->buffer.allocated - (int)len) >= 0);
        s->buffer.allocated -= (nk_size)len;
    } else nk_str_remove_chars(s, len);
    s->len = nk_utf_len((char *)s->buffer.memory.ptr, (int)s->buffer.allocated);
}

NK_API void
nk_str_delete_runes(struct nk_str *s, int pos, int len)
{
    char *temp;
    nk_rune unicode;
    char *begin;
    char *end;
    int unused;

    NK_ASSERT(s);
    NK_ASSERT(s->len >= pos + len);
    if (s->len < pos + len)
        len = NK_CLAMP(0, (s->len - pos), s->len);
    if (!len) return;

    temp = (char *)s->buffer.memory.ptr;
    begin = nk_str_at_rune(s, pos, &unicode, &unused);
    if (!begin) return;
    s->buffer.memory.ptr = begin;
    end = nk_str_at_rune(s, len, &unicode, &unused);
    s->buffer.memory.ptr = temp;
    if (!end) return;
    nk_str_delete_chars(s, (int)(begin - temp), (int)(end - begin));
}

NK_API char*
nk_str_at_char(struct nk_str *s, int pos)
{
    NK_ASSERT(s);
    if (!s || pos > (int)s->buffer.allocated) return 0;
    return nk_ptr_add(char, s->buffer.memory.ptr, pos);
}

NK_API char*
nk_str_at_rune(struct nk_str *str, int pos, nk_rune *unicode, int *len)
{
    int i = 0;
    int src_len = 0;
    int glyph_len = 0;
    char *text;
    int text_len;

    NK_ASSERT(str);
    NK_ASSERT(unicode);
    NK_ASSERT(len);

    if (!str || !unicode || !len) return 0;
    if (pos < 0) {
        *unicode = 0;
        *len = 0;
        return 0;
    }

    text = (char*)str->buffer.memory.ptr;
    text_len = (int)str->buffer.allocated;
    glyph_len = nk_utf_decode(text, unicode, text_len);
    while (glyph_len) {
        if (i == pos) {
            *len = glyph_len;
            break;
        }

        i++;
        src_len = src_len + glyph_len;
        glyph_len = nk_utf_decode(text + src_len, unicode, text_len - src_len);
    }
    if (i != pos) return 0;
    return text + src_len;
}

NK_API const char*
nk_str_at_char_const(const struct nk_str *s, int pos)
{
    NK_ASSERT(s);
    if (!s || pos > (int)s->buffer.allocated) return 0;
    return nk_ptr_add(char, s->buffer.memory.ptr, pos);
}

NK_API const char*
nk_str_at_const(const struct nk_str *str, int pos, nk_rune *unicode, int *len)
{
    int i = 0;
    int src_len = 0;
    int glyph_len = 0;
    char *text;
    int text_len;

    NK_ASSERT(str);
    NK_ASSERT(unicode);
    NK_ASSERT(len);

    if (!str || !unicode || !len) return 0;
    if (pos < 0) {
        *unicode = 0;
        *len = 0;
        return 0;
    }

    text = (char*)str->buffer.memory.ptr;
    text_len = (int)str->buffer.allocated;
    glyph_len = nk_utf_decode(text, unicode, text_len);
    while (glyph_len) {
        if (i == pos) {
            *len = glyph_len;
            break;
        }

        i++;
        src_len = src_len + glyph_len;
        glyph_len = nk_utf_decode(text + src_len, unicode, text_len - src_len);
    }
    if (i != pos) return 0;
    return text + src_len;
}

NK_API nk_rune
nk_str_rune_at(const struct nk_str *str, int pos)
{
    int len;
    nk_rune unicode = 0;
    nk_str_at_const(str, pos, &unicode, &len);
    return unicode;
}

NK_API char*
nk_str_get(struct nk_str *s)
{
    NK_ASSERT(s);
    if (!s || !s->len || !s->buffer.allocated) return 0;
    return (char*)s->buffer.memory.ptr;
}

NK_API const char*
nk_str_get_const(const struct nk_str *s)
{
    NK_ASSERT(s);
    if (!s || !s->len || !s->buffer.allocated) return 0;
    return (const char*)s->buffer.memory.ptr;
}

NK_API int
nk_str_len(struct nk_str *s)
{
    NK_ASSERT(s);
    if (!s || !s->len || !s->buffer.allocated) return 0;
    return s->len;
}

NK_API int
nk_str_len_char(struct nk_str *s)
{
    NK_ASSERT(s);
    if (!s || !s->len || !s->buffer.allocated) return 0;
    return (int)s->buffer.allocated;
}

NK_API void
nk_str_clear(struct nk_str *str)
{
    NK_ASSERT(str);
    nk_buffer_clear(&str->buffer);
    str->len = 0;
}

NK_API void
nk_str_free(struct nk_str *str)
{
    NK_ASSERT(str);
    nk_buffer_free(&str->buffer);
    str->len = 0;
}

/*
 * ==============================================================
 *
 *                      Command buffer
 *
 * ===============================================================
*/
NK_INTERN void
nk_command_buffer_init(struct nk_command_buffer *cmdbuf,
    struct nk_buffer *buffer, enum nk_command_clipping clip)
{
    NK_ASSERT(cmdbuf);
    NK_ASSERT(buffer);
    if (!cmdbuf || !buffer) return;
    cmdbuf->base = buffer;
    cmdbuf->use_clipping = clip;
    cmdbuf->begin = buffer->allocated;
    cmdbuf->end = buffer->allocated;
    cmdbuf->last = buffer->allocated;
}

NK_INTERN void
nk_command_buffer_reset(struct nk_command_buffer *buffer)
{
    NK_ASSERT(buffer);
    if (!buffer) return;
    buffer->begin = 0;
    buffer->end = 0;
    buffer->last = 0;
    buffer->clip = nk_null_rect;
#ifdef NK_INCLUDE_COMMAND_USERDATA
    buffer->userdata.ptr = 0;
#endif
}

NK_INTERN void*
nk_command_buffer_push(struct nk_command_buffer* b,
    enum nk_command_type t, nk_size size)
{
    NK_STORAGE const nk_size align = NK_ALIGNOF(struct nk_command);
    struct nk_command *cmd;
    nk_size alignment;
    void *unaligned;
    void *memory;

    NK_ASSERT(b);
    NK_ASSERT(b->base);
    if (!b) return 0;
    cmd = (struct nk_command*)nk_buffer_alloc(b->base,NK_BUFFER_FRONT,size,align);
    if (!cmd) return 0;

    /* make sure the offset to the next command is aligned */
    b->last = (nk_size)((nk_byte*)cmd - (nk_byte*)b->base->memory.ptr);
    unaligned = (nk_byte*)cmd + size;
    memory = NK_ALIGN_PTR(unaligned, align);
    alignment = (nk_size)((nk_byte*)memory - (nk_byte*)unaligned);
#ifdef NK_ZERO_COMMAND_MEMORY
    NK_MEMSET(cmd, 0, size + alignment);
#endif

    cmd->type = t;
    cmd->next = b->base->allocated + alignment;
#ifdef NK_INCLUDE_COMMAND_USERDATA
    cmd->userdata = b->userdata;
#endif
    b->end = cmd->next;
    return cmd;
}

NK_API void
nk_push_scissor(struct nk_command_buffer *b, struct nk_rect r)
{
    struct nk_command_scissor *cmd;
    NK_ASSERT(b);
    if (!b) return;

    b->clip.x = r.x;
    b->clip.y = r.y;
    b->clip.w = r.w;
    b->clip.h = r.h;
    cmd = (struct nk_command_scissor*)
        nk_command_buffer_push(b, NK_COMMAND_SCISSOR, sizeof(*cmd));

    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(0, r.w);
    cmd->h = (unsigned short)NK_MAX(0, r.h);
}

NK_API void
nk_stroke_line(struct nk_command_buffer *b, float x0, float y0,
    float x1, float y1, float line_thickness, struct nk_color c)
{
    struct nk_command_line *cmd;
    NK_ASSERT(b);
    if (!b || line_thickness <= 0) return;
    cmd = (struct nk_command_line*)
        nk_command_buffer_push(b, NK_COMMAND_LINE, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->begin.x = (short)x0;
    cmd->begin.y = (short)y0;
    cmd->end.x = (short)x1;
    cmd->end.y = (short)y1;
    cmd->color = c;
}

NK_API void
nk_stroke_curve(struct nk_command_buffer *b, float ax, float ay,
    float ctrl0x, float ctrl0y, float ctrl1x, float ctrl1y,
    float bx, float by, float line_thickness, struct nk_color col)
{
    struct nk_command_curve *cmd;
    NK_ASSERT(b);
    if (!b || col.a == 0 || line_thickness <= 0) return;

    cmd = (struct nk_command_curve*)
        nk_command_buffer_push(b, NK_COMMAND_CURVE, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->begin.x = (short)ax;
    cmd->begin.y = (short)ay;
    cmd->ctrl[0].x = (short)ctrl0x;
    cmd->ctrl[0].y = (short)ctrl0y;
    cmd->ctrl[1].x = (short)ctrl1x;
    cmd->ctrl[1].y = (short)ctrl1y;
    cmd->end.x = (short)bx;
    cmd->end.y = (short)by;
    cmd->color = col;
}

NK_API void
nk_stroke_rect(struct nk_command_buffer *b, struct nk_rect rect,
    float rounding, float line_thickness, struct nk_color c)
{
    struct nk_command_rect *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0 || rect.w == 0 || rect.h == 0 || line_thickness <= 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(rect.x, rect.y, rect.w, rect.h,
            clip->x, clip->y, clip->w, clip->h)) return;
    }
    cmd = (struct nk_command_rect*)
        nk_command_buffer_push(b, NK_COMMAND_RECT, sizeof(*cmd));
    if (!cmd) return;
    cmd->rounding = (unsigned short)rounding;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->x = (short)rect.x;
    cmd->y = (short)rect.y;
    cmd->w = (unsigned short)NK_MAX(0, rect.w);
    cmd->h = (unsigned short)NK_MAX(0, rect.h);
    cmd->color = c;
}

NK_API void
nk_fill_rect(struct nk_command_buffer *b, struct nk_rect rect,
    float rounding, struct nk_color c)
{
    struct nk_command_rect_filled *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0 || rect.w == 0 || rect.h == 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(rect.x, rect.y, rect.w, rect.h,
            clip->x, clip->y, clip->w, clip->h)) return;
    }

    cmd = (struct nk_command_rect_filled*)
        nk_command_buffer_push(b, NK_COMMAND_RECT_FILLED, sizeof(*cmd));
    if (!cmd) return;
    cmd->rounding = (unsigned short)rounding;
    cmd->x = (short)rect.x;
    cmd->y = (short)rect.y;
    cmd->w = (unsigned short)NK_MAX(0, rect.w);
    cmd->h = (unsigned short)NK_MAX(0, rect.h);
    cmd->color = c;
}

NK_API void
nk_fill_rect_multi_color(struct nk_command_buffer *b, struct nk_rect rect,
    struct nk_color left, struct nk_color top, struct nk_color right,
    struct nk_color bottom)
{
    struct nk_command_rect_multi_color *cmd;
    NK_ASSERT(b);
    if (!b || rect.w == 0 || rect.h == 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(rect.x, rect.y, rect.w, rect.h,
            clip->x, clip->y, clip->w, clip->h)) return;
    }

    cmd = (struct nk_command_rect_multi_color*)
        nk_command_buffer_push(b, NK_COMMAND_RECT_MULTI_COLOR, sizeof(*cmd));
    if (!cmd) return;
    cmd->x = (short)rect.x;
    cmd->y = (short)rect.y;
    cmd->w = (unsigned short)NK_MAX(0, rect.w);
    cmd->h = (unsigned short)NK_MAX(0, rect.h);
    cmd->left = left;
    cmd->top = top;
    cmd->right = right;
    cmd->bottom = bottom;
}

NK_API void
nk_stroke_circle(struct nk_command_buffer *b, struct nk_rect r,
    float line_thickness, struct nk_color c)
{
    struct nk_command_circle *cmd;
    if (!b || r.w == 0 || r.h == 0 || line_thickness <= 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(r.x, r.y, r.w, r.h, clip->x, clip->y, clip->w, clip->h))
            return;
    }

    cmd = (struct nk_command_circle*)
        nk_command_buffer_push(b, NK_COMMAND_CIRCLE, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(r.w, 0);
    cmd->h = (unsigned short)NK_MAX(r.h, 0);
    cmd->color = c;
}

NK_API void
nk_fill_circle(struct nk_command_buffer *b, struct nk_rect r, struct nk_color c)
{
    struct nk_command_circle_filled *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0 || r.w == 0 || r.h == 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INTERSECT(r.x, r.y, r.w, r.h, clip->x, clip->y, clip->w, clip->h))
            return;
    }

    cmd = (struct nk_command_circle_filled*)
        nk_command_buffer_push(b, NK_COMMAND_CIRCLE_FILLED, sizeof(*cmd));
    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(r.w, 0);
    cmd->h = (unsigned short)NK_MAX(r.h, 0);
    cmd->color = c;
}

NK_API void
nk_stroke_arc(struct nk_command_buffer *b, float cx, float cy, float radius,
    float a_min, float a_max, float line_thickness, struct nk_color c)
{
    struct nk_command_arc *cmd;
    if (!b || c.a == 0 || line_thickness <= 0) return;
    cmd = (struct nk_command_arc*)
        nk_command_buffer_push(b, NK_COMMAND_ARC, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->cx = (short)cx;
    cmd->cy = (short)cy;
    cmd->r = (unsigned short)radius;
    cmd->a[0] = a_min;
    cmd->a[1] = a_max;
    cmd->color = c;
}

NK_API void
nk_fill_arc(struct nk_command_buffer *b, float cx, float cy, float radius,
    float a_min, float a_max, struct nk_color c)
{
    struct nk_command_arc_filled *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0) return;
    cmd = (struct nk_command_arc_filled*)
        nk_command_buffer_push(b, NK_COMMAND_ARC_FILLED, sizeof(*cmd));
    if (!cmd) return;
    cmd->cx = (short)cx;
    cmd->cy = (short)cy;
    cmd->r = (unsigned short)radius;
    cmd->a[0] = a_min;
    cmd->a[1] = a_max;
    cmd->color = c;
}

NK_API void
nk_stroke_triangle(struct nk_command_buffer *b, float x0, float y0, float x1,
    float y1, float x2, float y2, float line_thickness, struct nk_color c)
{
    struct nk_command_triangle *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0 || line_thickness <= 0) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INBOX(x0, y0, clip->x, clip->y, clip->w, clip->h) &&
            !NK_INBOX(x1, y1, clip->x, clip->y, clip->w, clip->h) &&
            !NK_INBOX(x2, y2, clip->x, clip->y, clip->w, clip->h))
            return;
    }

    cmd = (struct nk_command_triangle*)
        nk_command_buffer_push(b, NK_COMMAND_TRIANGLE, sizeof(*cmd));
    if (!cmd) return;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->a.x = (short)x0;
    cmd->a.y = (short)y0;
    cmd->b.x = (short)x1;
    cmd->b.y = (short)y1;
    cmd->c.x = (short)x2;
    cmd->c.y = (short)y2;
    cmd->color = c;
}

NK_API void
nk_fill_triangle(struct nk_command_buffer *b, float x0, float y0, float x1,
    float y1, float x2, float y2, struct nk_color c)
{
    struct nk_command_triangle_filled *cmd;
    NK_ASSERT(b);
    if (!b || c.a == 0) return;
    if (!b) return;
    if (b->use_clipping) {
        const struct nk_rect *clip = &b->clip;
        if (!NK_INBOX(x0, y0, clip->x, clip->y, clip->w, clip->h) &&
            !NK_INBOX(x1, y1, clip->x, clip->y, clip->w, clip->h) &&
            !NK_INBOX(x2, y2, clip->x, clip->y, clip->w, clip->h))
            return;
    }

    cmd = (struct nk_command_triangle_filled*)
        nk_command_buffer_push(b, NK_COMMAND_TRIANGLE_FILLED, sizeof(*cmd));
    if (!cmd) return;
    cmd->a.x = (short)x0;
    cmd->a.y = (short)y0;
    cmd->b.x = (short)x1;
    cmd->b.y = (short)y1;
    cmd->c.x = (short)x2;
    cmd->c.y = (short)y2;
    cmd->color = c;
}

NK_API void
nk_stroke_polygon(struct nk_command_buffer *b,  float *points, int point_count,
    float line_thickness, struct nk_color col)
{
    int i;
    nk_size size = 0;
    struct nk_command_polygon *cmd;

    NK_ASSERT(b);
    if (!b || col.a == 0 || line_thickness <= 0) return;
    size = sizeof(*cmd) + sizeof(short) * 2 * (nk_size)point_count;
    cmd = (struct nk_command_polygon*) nk_command_buffer_push(b, NK_COMMAND_POLYGON, size);
    if (!cmd) return;
    cmd->color = col;
    cmd->line_thickness = (unsigned short)line_thickness;
    cmd->point_count = (unsigned short)point_count;
    for (i = 0; i < point_count; ++i) {
        cmd->points[i].x = (short)points[i*2];
        cmd->points[i].y = (short)points[i*2+1];
    }
}

NK_API void
nk_fill_polygon(struct nk_command_buffer *b, float *points, int point_count,
    struct nk_color col)
{
    int i;
    nk_size size = 0;
    struct nk_command_polygon_filled *cmd;

    NK_ASSERT(b);
    if (!b || col.a == 0) return;
    size = sizeof(*cmd) + sizeof(short) * 2 * (nk_size)point_count;
    cmd = (struct nk_command_polygon_filled*)
        nk_command_buffer_push(b, NK_COMMAND_POLYGON_FILLED, size);
    if (!cmd) return;
    cmd->color = col;
    cmd->point_count = (unsigned short)point_count;
    for (i = 0; i < point_count; ++i) {
        cmd->points[i].x = (short)points[i*2+0];
        cmd->points[i].y = (short)points[i*2+1];
    }
}

NK_API void
nk_stroke_polyline(struct nk_command_buffer *b, float *points, int point_count,
    float line_thickness, struct nk_color col)
{
    int i;
    nk_size size = 0;
    struct nk_command_polyline *cmd;

    NK_ASSERT(b);
    if (!b || col.a == 0 || line_thickness <= 0) return;
    size = sizeof(*cmd) + sizeof(short) * 2 * (nk_size)point_count;
    cmd = (struct nk_command_polyline*) nk_command_buffer_push(b, NK_COMMAND_POLYLINE, size);
    if (!cmd) return;
    cmd->color = col;
    cmd->point_count = (unsigned short)point_count;
    cmd->line_thickness = (unsigned short)line_thickness;
    for (i = 0; i < point_count; ++i) {
        cmd->points[i].x = (short)points[i*2];
        cmd->points[i].y = (short)points[i*2+1];
    }
}

NK_API void
nk_draw_image(struct nk_command_buffer *b, struct nk_rect r,
    const struct nk_image *img, struct nk_color col)
{
    struct nk_command_image *cmd;
    NK_ASSERT(b);
    if (!b) return;
    if (b->use_clipping) {
        const struct nk_rect *c = &b->clip;
        if (c->w == 0 || c->h == 0 || !NK_INTERSECT(r.x, r.y, r.w, r.h, c->x, c->y, c->w, c->h))
            return;
    }

    cmd = (struct nk_command_image*)
        nk_command_buffer_push(b, NK_COMMAND_IMAGE, sizeof(*cmd));
    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(0, r.w);
    cmd->h = (unsigned short)NK_MAX(0, r.h);
    cmd->img = *img;
    cmd->col = col;
}

NK_API void
nk_push_custom(struct nk_command_buffer *b, struct nk_rect r,
    nk_command_custom_callback cb, nk_handle usr)
{
    struct nk_command_custom *cmd;
    NK_ASSERT(b);
    if (!b) return;
    if (b->use_clipping) {
        const struct nk_rect *c = &b->clip;
        if (c->w == 0 || c->h == 0 || !NK_INTERSECT(r.x, r.y, r.w, r.h, c->x, c->y, c->w, c->h))
            return;
    }

    cmd = (struct nk_command_custom*)
        nk_command_buffer_push(b, NK_COMMAND_CUSTOM, sizeof(*cmd));
    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)NK_MAX(0, r.w);
    cmd->h = (unsigned short)NK_MAX(0, r.h);
    cmd->callback_data = usr;
    cmd->callback = cb;
}

NK_API void
nk_draw_text(struct nk_command_buffer *b, struct nk_rect r,
    const char *string, int length, const struct nk_user_font *font,
    struct nk_color bg, struct nk_color fg)
{
    float text_width = 0;
    struct nk_command_text *cmd;

    NK_ASSERT(b);
    NK_ASSERT(font);
    if (!b || !string || !length || (bg.a == 0 && fg.a == 0)) return;
    if (b->use_clipping) {
        const struct nk_rect *c = &b->clip;
        if (c->w == 0 || c->h == 0 || !NK_INTERSECT(r.x, r.y, r.w, r.h, c->x, c->y, c->w, c->h))
            return;
    }

    /* make sure text fits inside bounds */
    text_width = font->width(font->userdata, font->height, string, length);
    if (text_width > r.w){
        int glyphs = 0;
        float txt_width = (float)text_width;
        length = nk_text_clamp(font, string, length, r.w, &glyphs, &txt_width, 0,0);
    }

    if (!length) return;
    cmd = (struct nk_command_text*)
        nk_command_buffer_push(b, NK_COMMAND_TEXT, sizeof(*cmd) + (nk_size)(length + 1));
    if (!cmd) return;
    cmd->x = (short)r.x;
    cmd->y = (short)r.y;
    cmd->w = (unsigned short)r.w;
    cmd->h = (unsigned short)r.h;
    cmd->background = bg;
    cmd->foreground = fg;
    cmd->font = font;
    cmd->length = length;
    cmd->height = font->height;
    NK_MEMCPY(cmd->string, string, (nk_size)length);
    cmd->string[length] = '\0';
}

/* ==============================================================
 *
 *                          DRAW LIST
 *
 * ===============================================================*/
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
NK_API void
nk_draw_list_init(struct nk_draw_list *list)
{
    nk_size i = 0;
    NK_ASSERT(list);
    if (!list) return;
    nk_zero(list, sizeof(*list));
    for (i = 0; i < NK_LEN(list->circle_vtx); ++i) {
        const float a = ((float)i / (float)NK_LEN(list->circle_vtx)) * 2 * NK_PI;
        list->circle_vtx[i].x = (float)NK_COS(a);
        list->circle_vtx[i].y = (float)NK_SIN(a);
    }
}

NK_API void
nk_draw_list_setup(struct nk_draw_list *canvas, const struct nk_convert_config *config,
    struct nk_buffer *cmds, struct nk_buffer *vertices, struct nk_buffer *elements,
    enum nk_anti_aliasing line_aa, enum nk_anti_aliasing shape_aa)
{
    NK_ASSERT(canvas);
    NK_ASSERT(config);
    NK_ASSERT(cmds);
    NK_ASSERT(vertices);
    NK_ASSERT(elements);
    if (!canvas || !config || !cmds || !vertices || !elements)
        return;

    canvas->buffer = cmds;
    canvas->config = *config;
    canvas->elements = elements;
    canvas->vertices = vertices;
    canvas->line_AA = line_aa;
    canvas->shape_AA = shape_aa;
    canvas->clip_rect = nk_null_rect;
}

NK_API const struct nk_draw_command*
nk__draw_list_begin(const struct nk_draw_list *canvas, const struct nk_buffer *buffer)
{
    nk_byte *memory;
    nk_size offset;
    const struct nk_draw_command *cmd;

    NK_ASSERT(buffer);
    if (!buffer || !buffer->size || !canvas->cmd_count)
        return 0;

    memory = (nk_byte*)buffer->memory.ptr;
    offset = buffer->memory.size - canvas->cmd_offset;
    cmd = nk_ptr_add(const struct nk_draw_command, memory, offset);
    return cmd;
}

NK_API const struct nk_draw_command*
nk__draw_list_end(const struct nk_draw_list *canvas, const struct nk_buffer *buffer)
{
    nk_size size;
    nk_size offset;
    nk_byte *memory;
    const struct nk_draw_command *end;

    NK_ASSERT(buffer);
    NK_ASSERT(canvas);
    if (!buffer || !canvas)
        return 0;

    memory = (nk_byte*)buffer->memory.ptr;
    size = buffer->memory.size;
    offset = size - canvas->cmd_offset;
    end = nk_ptr_add(const struct nk_draw_command, memory, offset);
    end -= (canvas->cmd_count-1);
    return end;
}

NK_API const struct nk_draw_command*
nk__draw_list_next(const struct nk_draw_command *cmd,
    const struct nk_buffer *buffer, const struct nk_draw_list *canvas)
{
    const struct nk_draw_command *end;
    NK_ASSERT(buffer);
    NK_ASSERT(canvas);
    if (!cmd || !buffer || !canvas)
        return 0;

    end = nk__draw_list_end(canvas, buffer);
    if (cmd <= end) return 0;
    return (cmd-1);
}

NK_API void
nk_draw_list_clear(struct nk_draw_list *list)
{
    NK_ASSERT(list);
    if (!list) return;
    if (list->buffer)
        nk_buffer_clear(list->buffer);
    if (list->vertices)
        nk_buffer_clear(list->vertices);
    if (list->elements)
        nk_buffer_clear(list->elements);

    list->element_count = 0;
    list->vertex_count = 0;
    list->cmd_offset = 0;
    list->cmd_count = 0;
    list->path_count = 0;
    list->vertices = 0;
    list->elements = 0;
    list->clip_rect = nk_null_rect;
}

NK_INTERN struct nk_vec2*
nk_draw_list_alloc_path(struct nk_draw_list *list, int count)
{
    struct nk_vec2 *points;
    NK_STORAGE const nk_size point_align = NK_ALIGNOF(struct nk_vec2);
    NK_STORAGE const nk_size point_size = sizeof(struct nk_vec2);
    points = (struct nk_vec2*)
        nk_buffer_alloc(list->buffer, NK_BUFFER_FRONT,
                        point_size * (nk_size)count, point_align);

    if (!points) return 0;
    if (!list->path_offset) {
        void *memory = nk_buffer_memory(list->buffer);
        list->path_offset = (unsigned int)((nk_byte*)points - (nk_byte*)memory);
    }
    list->path_count += (unsigned int)count;
    return points;
}

NK_INTERN struct nk_vec2
nk_draw_list_path_last(struct nk_draw_list *list)
{
    void *memory;
    struct nk_vec2 *point;
    NK_ASSERT(list->path_count);
    memory = nk_buffer_memory(list->buffer);
    point = nk_ptr_add(struct nk_vec2, memory, list->path_offset);
    point += (list->path_count-1);
    return *point;
}

NK_INTERN struct nk_draw_command*
nk_draw_list_push_command(struct nk_draw_list *list, struct nk_rect clip,
    nk_handle texture)
{
    NK_STORAGE const nk_size cmd_align = NK_ALIGNOF(struct nk_draw_command);
    NK_STORAGE const nk_size cmd_size = sizeof(struct nk_draw_command);
    struct nk_draw_command *cmd;

    NK_ASSERT(list);
    cmd = (struct nk_draw_command*)
        nk_buffer_alloc(list->buffer, NK_BUFFER_BACK, cmd_size, cmd_align);

    if (!cmd) return 0;
    if (!list->cmd_count) {
        nk_byte *memory = (nk_byte*)nk_buffer_memory(list->buffer);
        nk_size total = nk_buffer_total(list->buffer);
        memory = nk_ptr_add(nk_byte, memory, total);
        list->cmd_offset = (nk_size)(memory - (nk_byte*)cmd);
    }

    cmd->elem_count = 0;
    cmd->clip_rect = clip;
    cmd->texture = texture;
#ifdef NK_INCLUDE_COMMAND_USERDATA
    cmd->userdata = list->userdata;
#endif

    list->cmd_count++;
    list->clip_rect = clip;
    return cmd;
}

NK_INTERN struct nk_draw_command*
nk_draw_list_command_last(struct nk_draw_list *list)
{
    void *memory;
    nk_size size;
    struct nk_draw_command *cmd;
    NK_ASSERT(list->cmd_count);

    memory = nk_buffer_memory(list->buffer);
    size = nk_buffer_total(list->buffer);
    cmd = nk_ptr_add(struct nk_draw_command, memory, size - list->cmd_offset);
    return (cmd - (list->cmd_count-1));
}

NK_INTERN void
nk_draw_list_add_clip(struct nk_draw_list *list, struct nk_rect rect)
{
    NK_ASSERT(list);
    if (!list) return;
    if (!list->cmd_count) {
        nk_draw_list_push_command(list, rect, list->config.null.texture);
    } else {
        struct nk_draw_command *prev = nk_draw_list_command_last(list);
        if (prev->elem_count == 0)
            prev->clip_rect = rect;
        nk_draw_list_push_command(list, rect, prev->texture);
    }
}

NK_INTERN void
nk_draw_list_push_image(struct nk_draw_list *list, nk_handle texture)
{
    NK_ASSERT(list);
    if (!list) return;
    if (!list->cmd_count) {
        nk_draw_list_push_command(list, nk_null_rect, texture);
    } else {
        struct nk_draw_command *prev = nk_draw_list_command_last(list);
        if (prev->elem_count == 0)
            prev->texture = texture;
        else if (prev->texture.id != texture.id)
            nk_draw_list_push_command(list, prev->clip_rect, texture);
    }
}

#ifdef NK_INCLUDE_COMMAND_USERDATA
NK_API void
nk_draw_list_push_userdata(struct nk_draw_list *list, nk_handle userdata)
{
    list->userdata = userdata;
}
#endif

NK_INTERN void*
nk_draw_list_alloc_vertices(struct nk_draw_list *list, nk_size count)
{
    void *vtx;
    NK_ASSERT(list);
    if (!list) return 0;
    vtx = nk_buffer_alloc(list->vertices, NK_BUFFER_FRONT,
        list->config.vertex_size*count, list->config.vertex_alignment);
    if (!vtx) return 0;
    list->vertex_count += (unsigned int)count;
    return vtx;
}

NK_INTERN nk_draw_index*
nk_draw_list_alloc_elements(struct nk_draw_list *list, nk_size count)
{
    nk_draw_index *ids;
    struct nk_draw_command *cmd;
    NK_STORAGE const nk_size elem_align = NK_ALIGNOF(nk_draw_index);
    NK_STORAGE const nk_size elem_size = sizeof(nk_draw_index);
    NK_ASSERT(list);
    if (!list) return 0;

    ids = (nk_draw_index*)
        nk_buffer_alloc(list->elements, NK_BUFFER_FRONT, elem_size*count, elem_align);
    if (!ids) return 0;
    cmd = nk_draw_list_command_last(list);
    list->element_count += (unsigned int)count;
    cmd->elem_count += (unsigned int)count;
    return ids;
}

NK_INTERN int
nk_draw_vertex_layout_element_is_end_of_layout(
    const struct nk_draw_vertex_layout_element *element)
{
    return (element->attribute == NK_VERTEX_ATTRIBUTE_COUNT ||
            element->format == NK_FORMAT_COUNT);
}

NK_INTERN void
nk_draw_vertex_color(void *attribute, const float *values,
    enum nk_draw_vertex_layout_format format)
{
    /* if this triggers you tried to provide a value format for a color */
    NK_ASSERT(format >= NK_FORMAT_COLOR_BEGIN);
    NK_ASSERT(format <= NK_FORMAT_COLOR_END);
    if (format < NK_FORMAT_COLOR_BEGIN || format > NK_FORMAT_COLOR_END) return;

    switch (format) {
    default: NK_ASSERT(0 && "Invalid vertex layout color format"); break;
    case NK_FORMAT_R8G8B8A8:
    case NK_FORMAT_R8G8B8: {
        struct nk_color col = nk_rgba_fv(values);
        NK_MEMCPY(attribute, &col.r, sizeof(col));
    } break;
    case NK_FORMAT_B8G8R8A8: {
        struct nk_color col = nk_rgba_fv(values);
        struct nk_color bgra = nk_rgba(col.b, col.g, col.r, col.a);
        NK_MEMCPY(attribute, &bgra, sizeof(bgra));
    } break;
    case NK_FORMAT_R16G15B16: {
        nk_ushort col[3];
        col[0] = (nk_ushort)NK_CLAMP(NK_USHORT_MIN, values[0] * NK_USHORT_MAX, NK_USHORT_MAX);
        col[1] = (nk_ushort)NK_CLAMP(NK_USHORT_MIN, values[1] * NK_USHORT_MAX, NK_USHORT_MAX);
        col[2] = (nk_ushort)NK_CLAMP(NK_USHORT_MIN, values[2] * NK_USHORT_MAX, NK_USHORT_MAX);
        NK_MEMCPY(attribute, col, sizeof(col));
    } break;
    case NK_FORMAT_R16G15B16A16: {
        nk_ushort col[4];
        col[0] = (nk_ushort)NK_CLAMP(NK_USHORT_MIN, values[0] * NK_USHORT_MAX, NK_USHORT_MAX);
        col[1] = (nk_ushort)NK_CLAMP(NK_USHORT_MIN, values[1] * NK_USHORT_MAX, NK_USHORT_MAX);
        col[2] = (nk_ushort)NK_CLAMP(NK_USHORT_MIN, values[2] * NK_USHORT_MAX, NK_USHORT_MAX);
        col[3] = (nk_ushort)NK_CLAMP(NK_USHORT_MIN, values[3] * NK_USHORT_MAX, NK_USHORT_MAX);
        NK_MEMCPY(attribute, col, sizeof(col));
    } break;
    case NK_FORMAT_R32G32B32: {
        nk_uint col[3];
        col[0] = (nk_uint)NK_CLAMP(NK_UINT_MIN, values[0] * NK_UINT_MAX, NK_UINT_MAX);
        col[1] = (nk_uint)NK_CLAMP(NK_UINT_MIN, values[1] * NK_UINT_MAX, NK_UINT_MAX);
        col[2] = (nk_uint)NK_CLAMP(NK_UINT_MIN, values[2] * NK_UINT_MAX, NK_UINT_MAX);
        NK_MEMCPY(attribute, col, sizeof(col));
    } break;
    case NK_FORMAT_R32G32B32A32: {
        nk_uint col[4];
        col[0] = (nk_uint)NK_CLAMP(NK_UINT_MIN, values[0] * NK_UINT_MAX, NK_UINT_MAX);
        col[1] = (nk_uint)NK_CLAMP(NK_UINT_MIN, values[1] * NK_UINT_MAX, NK_UINT_MAX);
        col[2] = (nk_uint)NK_CLAMP(NK_UINT_MIN, values[2] * NK_UINT_MAX, NK_UINT_MAX);
        col[3] = (nk_uint)NK_CLAMP(NK_UINT_MIN, values[3] * NK_UINT_MAX, NK_UINT_MAX);
        NK_MEMCPY(attribute, col, sizeof(col));
    } break;
    case NK_FORMAT_R32G32B32A32_FLOAT:
        NK_MEMCPY(attribute, values, sizeof(float)*4);
        break;
    case NK_FORMAT_R32G32B32A32_DOUBLE: {
        double col[4];
        col[0] = (double)NK_SATURATE(values[0]);
        col[1] = (double)NK_SATURATE(values[1]);
        col[2] = (double)NK_SATURATE(values[2]);
        col[3] = (double)NK_SATURATE(values[3]);
        NK_MEMCPY(attribute, col, sizeof(col));
    } break;
    case NK_FORMAT_RGB32:
    case NK_FORMAT_RGBA32: {
        struct nk_color col = nk_rgba_fv(values);
        nk_uint color = nk_color_u32(col);
        NK_MEMCPY(attribute, &color, sizeof(color));
    } break;
    }
}

NK_INTERN void
nk_draw_vertex_element(void *dst, const float *values, int value_count,
    enum nk_draw_vertex_layout_format format)
{
    int value_index;
    void *attribute = dst;
    /* if this triggers you tried to provide a color format for a value */
    NK_ASSERT(format < NK_FORMAT_COLOR_BEGIN);
    if (format >= NK_FORMAT_COLOR_BEGIN && format <= NK_FORMAT_COLOR_END) return;
    for (value_index = 0; value_index < value_count; ++value_index) {
        switch (format) {
        default: NK_ASSERT(0 && "invalid vertex layout format"); break;
        case NK_FORMAT_SCHAR: {
            char value = (char)NK_CLAMP(NK_SCHAR_MIN, values[value_index], NK_SCHAR_MAX);
            NK_MEMCPY(attribute, &value, sizeof(value));
            attribute = (void*)((char*)attribute + sizeof(char));
        } break;
        case NK_FORMAT_SSHORT: {
            nk_short value = (nk_short)NK_CLAMP(NK_SSHORT_MIN, values[value_index], NK_SSHORT_MAX);
            NK_MEMCPY(attribute, &value, sizeof(value));
            attribute = (void*)((char*)attribute + sizeof(value));
        } break;
        case NK_FORMAT_SINT: {
            nk_int value = (nk_int)NK_CLAMP(NK_SINT_MIN, values[value_index], NK_SINT_MAX);
            NK_MEMCPY(attribute, &value, sizeof(value));
            attribute = (void*)((char*)attribute + sizeof(nk_int));
        } break;
        case NK_FORMAT_UCHAR: {
            unsigned char value = (unsigned char)NK_CLAMP(NK_UCHAR_MIN, values[value_index], NK_UCHAR_MAX);
            NK_MEMCPY(attribute, &value, sizeof(value));
            attribute = (void*)((char*)attribute + sizeof(unsigned char));
        } break;
        case NK_FORMAT_USHORT: {
            nk_ushort value = (nk_ushort)NK_CLAMP(NK_USHORT_MIN, values[value_index], NK_USHORT_MAX);
            NK_MEMCPY(attribute, &value, sizeof(value));
            attribute = (void*)((char*)attribute + sizeof(value));
            } break;
        case NK_FORMAT_UINT: {
            nk_uint value = (nk_uint)NK_CLAMP(NK_UINT_MIN, values[value_index], NK_UINT_MAX);
            NK_MEMCPY(attribute, &value, sizeof(value));
            attribute = (void*)((char*)attribute + sizeof(nk_uint));
        } break;
        case NK_FORMAT_FLOAT:
            NK_MEMCPY(attribute, &values[value_index], sizeof(values[value_index]));
            attribute = (void*)((char*)attribute + sizeof(float));
            break;
        case NK_FORMAT_DOUBLE: {
            double value = (double)values[value_index];
            NK_MEMCPY(attribute, &value, sizeof(value));
            attribute = (void*)((char*)attribute + sizeof(double));
            } break;
        }
    }
}

NK_INTERN void*
nk_draw_vertex(void *dst, const struct nk_convert_config *config,
    struct nk_vec2 pos, struct nk_vec2 uv, struct nk_colorf color)
{
    void *result = (void*)((char*)dst + config->vertex_size);
    const struct nk_draw_vertex_layout_element *elem_iter = config->vertex_layout;
    while (!nk_draw_vertex_layout_element_is_end_of_layout(elem_iter)) {
        void *address = (void*)((char*)dst + elem_iter->offset);
        switch (elem_iter->attribute) {
        case NK_VERTEX_ATTRIBUTE_COUNT:
        default: NK_ASSERT(0 && "wrong element attribute");
        case NK_VERTEX_POSITION: nk_draw_vertex_element(address, &pos.x, 2, elem_iter->format); break;
        case NK_VERTEX_TEXCOORD: nk_draw_vertex_element(address, &uv.x, 2, elem_iter->format); break;
        case NK_VERTEX_COLOR: nk_draw_vertex_color(address, &color.r, elem_iter->format); break;
        }
        elem_iter++;
    }
    return result;
}

NK_API void
nk_draw_list_stroke_poly_line(struct nk_draw_list *list, const struct nk_vec2 *points,
    const unsigned int points_count, struct nk_color color, enum nk_draw_list_stroke closed,
    float thickness, enum nk_anti_aliasing aliasing)
{
    nk_size count;
    int thick_line;
    struct nk_colorf col;
    struct nk_colorf col_trans;
    NK_ASSERT(list);
    if (!list || points_count < 2) return;

    color.a = (nk_byte)((float)color.a * list->config.global_alpha);
    count = points_count;
    if (!closed) count = points_count-1;
    thick_line = thickness > 1.0f;

#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_draw_list_push_userdata(list, list->userdata);
#endif

    color.a = (nk_byte)((float)color.a * list->config.global_alpha);
    nk_color_fv(&col.r, color);
    col_trans = col;
    col_trans.a = 0;

    if (aliasing == NK_ANTI_ALIASING_ON) {
        /* ANTI-ALIASED STROKE */
        const float AA_SIZE = 1.0f;
        NK_STORAGE const nk_size pnt_align = NK_ALIGNOF(struct nk_vec2);
        NK_STORAGE const nk_size pnt_size = sizeof(struct nk_vec2);

        /* allocate vertices and elements  */
        nk_size i1 = 0;
        nk_size vertex_offset;
        nk_size index = list->vertex_count;

        const nk_size idx_count = (thick_line) ?  (count * 18) : (count * 12);
        const nk_size vtx_count = (thick_line) ? (points_count * 4): (points_count *3);

        void *vtx = nk_draw_list_alloc_vertices(list, vtx_count);
        nk_draw_index *ids = nk_draw_list_alloc_elements(list, idx_count);

        nk_size size;
        struct nk_vec2 *normals, *temp;
        if (!vtx || !ids) return;

        /* temporary allocate normals + points */
        vertex_offset = (nk_size)((nk_byte*)vtx - (nk_byte*)list->vertices->memory.ptr);
        nk_buffer_mark(list->vertices, NK_BUFFER_FRONT);
        size = pnt_size * ((thick_line) ? 5 : 3) * points_count;
        normals = (struct nk_vec2*) nk_buffer_alloc(list->vertices, NK_BUFFER_FRONT, size, pnt_align);
        NK_ASSERT(normals);
        if (!normals) return;
        temp = normals + points_count;

        /* make sure vertex pointer is still correct */
        vtx = (void*)((nk_byte*)list->vertices->memory.ptr + vertex_offset);

        /* calculate normals */
        for (i1 = 0; i1 < count; ++i1) {
            const nk_size i2 = ((i1 + 1) == points_count) ? 0 : (i1 + 1);
            struct nk_vec2 diff = nk_vec2_sub(points[i2], points[i1]);
            float len;

            /* vec2 inverted length  */
            len = nk_vec2_len_sqr(diff);
            if (len != 0.0f)
                len = nk_inv_sqrt(len);
            else len = 1.0f;

            diff = nk_vec2_muls(diff, len);
            normals[i1].x = diff.y;
            normals[i1].y = -diff.x;
        }

        if (!closed)
            normals[points_count-1] = normals[points_count-2];

        if (!thick_line) {
            nk_size idx1, i;
            if (!closed) {
                struct nk_vec2 d;
                temp[0] = nk_vec2_add(points[0], nk_vec2_muls(normals[0], AA_SIZE));
                temp[1] = nk_vec2_sub(points[0], nk_vec2_muls(normals[0], AA_SIZE));
                d = nk_vec2_muls(normals[points_count-1], AA_SIZE);
                temp[(points_count-1) * 2 + 0] = nk_vec2_add(points[points_count-1], d);
                temp[(points_count-1) * 2 + 1] = nk_vec2_sub(points[points_count-1], d);
            }

            /* fill elements */
            idx1 = index;
            for (i1 = 0; i1 < count; i1++) {
                struct nk_vec2 dm;
                float dmr2;
                nk_size i2 = ((i1 + 1) == points_count) ? 0 : (i1 + 1);
                nk_size idx2 = ((i1+1) == points_count) ? index: (idx1 + 3);

                /* average normals */
                dm = nk_vec2_muls(nk_vec2_add(normals[i1], normals[i2]), 0.5f);
                dmr2 = dm.x * dm.x + dm.y* dm.y;
                if (dmr2 > 0.000001f) {
                    float scale = 1.0f/dmr2;
                    scale = NK_MIN(100.0f, scale);
                    dm = nk_vec2_muls(dm, scale);
                }

                dm = nk_vec2_muls(dm, AA_SIZE);
                temp[i2*2+0] = nk_vec2_add(points[i2], dm);
                temp[i2*2+1] = nk_vec2_sub(points[i2], dm);

                ids[0] = (nk_draw_index)(idx2 + 0); ids[1] = (nk_draw_index)(idx1+0);
                ids[2] = (nk_draw_index)(idx1 + 2); ids[3] = (nk_draw_index)(idx1+2);
                ids[4] = (nk_draw_index)(idx2 + 2); ids[5] = (nk_draw_index)(idx2+0);
                ids[6] = (nk_draw_index)(idx2 + 1); ids[7] = (nk_draw_index)(idx1+1);
                ids[8] = (nk_draw_index)(idx1 + 0); ids[9] = (nk_draw_index)(idx1+0);
                ids[10]= (nk_draw_index)(idx2 + 0); ids[11]= (nk_draw_index)(idx2+1);
                ids += 12;
                idx1 = idx2;
            }

            /* fill vertices */
            for (i = 0; i < points_count; ++i) {
                const struct nk_vec2 uv = list->config.null.uv;
                vtx = nk_draw_vertex(vtx, &list->config, points[i], uv, col);
                vtx = nk_draw_vertex(vtx, &list->config, temp[i*2+0], uv, col_trans);
                vtx = nk_draw_vertex(vtx, &list->config, temp[i*2+1], uv, col_trans);
            }
        } else {
            nk_size idx1, i;
            const float half_inner_thickness = (thickness - AA_SIZE) * 0.5f;
            if (!closed) {
                struct nk_vec2 d1 = nk_vec2_muls(normals[0], half_inner_thickness + AA_SIZE);
                struct nk_vec2 d2 = nk_vec2_muls(normals[0], half_inner_thickness);

                temp[0] = nk_vec2_add(points[0], d1);
                temp[1] = nk_vec2_add(points[0], d2);
                temp[2] = nk_vec2_sub(points[0], d2);
                temp[3] = nk_vec2_sub(points[0], d1);

                d1 = nk_vec2_muls(normals[points_count-1], half_inner_thickness + AA_SIZE);
                d2 = nk_vec2_muls(normals[points_count-1], half_inner_thickness);

                temp[(points_count-1)*4+0] = nk_vec2_add(points[points_count-1], d1);
                temp[(points_count-1)*4+1] = nk_vec2_add(points[points_count-1], d2);
                temp[(points_count-1)*4+2] = nk_vec2_sub(points[points_count-1], d2);
                temp[(points_count-1)*4+3] = nk_vec2_sub(points[points_count-1], d1);
            }

            /* add all elements */
            idx1 = index;
            for (i1 = 0; i1 < count; ++i1) {
                struct nk_vec2 dm_out, dm_in;
                const nk_size i2 = ((i1+1) == points_count) ? 0: (i1 + 1);
                nk_size idx2 = ((i1+1) == points_count) ? index: (idx1 + 4);

                /* average normals */
                struct nk_vec2 dm = nk_vec2_muls(nk_vec2_add(normals[i1], normals[i2]), 0.5f);
                float dmr2 = dm.x * dm.x + dm.y* dm.y;
                if (dmr2 > 0.000001f) {
                    float scale = 1.0f/dmr2;
                    scale = NK_MIN(100.0f, scale);
                    dm = nk_vec2_muls(dm, scale);
                }

                dm_out = nk_vec2_muls(dm, ((half_inner_thickness) + AA_SIZE));
                dm_in = nk_vec2_muls(dm, half_inner_thickness);
                temp[i2*4+0] = nk_vec2_add(points[i2], dm_out);
                temp[i2*4+1] = nk_vec2_add(points[i2], dm_in);
                temp[i2*4+2] = nk_vec2_sub(points[i2], dm_in);
                temp[i2*4+3] = nk_vec2_sub(points[i2], dm_out);

                /* add indexes */
                ids[0] = (nk_draw_index)(idx2 + 1); ids[1] = (nk_draw_index)(idx1+1);
                ids[2] = (nk_draw_index)(idx1 + 2); ids[3] = (nk_draw_index)(idx1+2);
                ids[4] = (nk_draw_index)(idx2 + 2); ids[5] = (nk_draw_index)(idx2+1);
                ids[6] = (nk_draw_index)(idx2 + 1); ids[7] = (nk_draw_index)(idx1+1);
                ids[8] = (nk_draw_index)(idx1 + 0); ids[9] = (nk_draw_index)(idx1+0);
                ids[10]= (nk_draw_index)(idx2 + 0); ids[11] = (nk_draw_index)(idx2+1);
                ids[12]= (nk_draw_index)(idx2 + 2); ids[13] = (nk_draw_index)(idx1+2);
                ids[14]= (nk_draw_index)(idx1 + 3); ids[15] = (nk_draw_index)(idx1+3);
                ids[16]= (nk_draw_index)(idx2 + 3); ids[17] = (nk_draw_index)(idx2+2);
                ids += 18;
                idx1 = idx2;
            }

            /* add vertices */
            for (i = 0; i < points_count; ++i) {
                const struct nk_vec2 uv = list->config.null.uv;
                vtx = nk_draw_vertex(vtx, &list->config, temp[i*4+0], uv, col_trans);
                vtx = nk_draw_vertex(vtx, &list->config, temp[i*4+1], uv, col);
                vtx = nk_draw_vertex(vtx, &list->config, temp[i*4+2], uv, col);
                vtx = nk_draw_vertex(vtx, &list->config, temp[i*4+3], uv, col_trans);
            }
        }
        /* free temporary normals + points */
        nk_buffer_reset(list->vertices, NK_BUFFER_FRONT);
    } else {
        /* NON ANTI-ALIASED STROKE */
        nk_size i1 = 0;
        nk_size idx = list->vertex_count;
        const nk_size idx_count = count * 6;
        const nk_size vtx_count = count * 4;
        void *vtx = nk_draw_list_alloc_vertices(list, vtx_count);
        nk_draw_index *ids = nk_draw_list_alloc_elements(list, idx_count);
        if (!vtx || !ids) return;

        for (i1 = 0; i1 < count; ++i1) {
            float dx, dy;
            const struct nk_vec2 uv = list->config.null.uv;
            const nk_size i2 = ((i1+1) == points_count) ? 0 : i1 + 1;
            const struct nk_vec2 p1 = points[i1];
            const struct nk_vec2 p2 = points[i2];
            struct nk_vec2 diff = nk_vec2_sub(p2, p1);
            float len;

            /* vec2 inverted length  */
            len = nk_vec2_len_sqr(diff);
            if (len != 0.0f)
                len = nk_inv_sqrt(len);
            else len = 1.0f;
            diff = nk_vec2_muls(diff, len);

            /* add vertices */
            dx = diff.x * (thickness * 0.5f);
            dy = diff.y * (thickness * 0.5f);

            vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(p1.x + dy, p1.y - dx), uv, col);
            vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(p2.x + dy, p2.y - dx), uv, col);
            vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(p2.x - dy, p2.y + dx), uv, col);
            vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(p1.x - dy, p1.y + dx), uv, col);

            ids[0] = (nk_draw_index)(idx+0); ids[1] = (nk_draw_index)(idx+1);
            ids[2] = (nk_draw_index)(idx+2); ids[3] = (nk_draw_index)(idx+0);
            ids[4] = (nk_draw_index)(idx+2); ids[5] = (nk_draw_index)(idx+3);

            ids += 6;
            idx += 4;
        }
    }
}

NK_API void
nk_draw_list_fill_poly_convex(struct nk_draw_list *list,
    const struct nk_vec2 *points, const unsigned int points_count,
    struct nk_color color, enum nk_anti_aliasing aliasing)
{
    struct nk_colorf col;
    struct nk_colorf col_trans;

    NK_STORAGE const nk_size pnt_align = NK_ALIGNOF(struct nk_vec2);
    NK_STORAGE const nk_size pnt_size = sizeof(struct nk_vec2);
    NK_ASSERT(list);
    if (!list || points_count < 3) return;

#ifdef NK_INCLUDE_COMMAND_USERDATA
    nk_draw_list_push_userdata(list, list->userdata);
#endif

    color.a = (nk_byte)((float)color.a * list->config.global_alpha);
    nk_color_fv(&col.r, color);
    col_trans = col;
    col_trans.a = 0;

    if (aliasing == NK_ANTI_ALIASING_ON) {
        nk_size i = 0;
        nk_size i0 = 0;
        nk_size i1 = 0;

        const float AA_SIZE = 1.0f;
        nk_size vertex_offset = 0;
        nk_size index = list->vertex_count;

        const nk_size idx_count = (points_count-2)*3 + points_count*6;
        const nk_size vtx_count = (points_count*2);

        void *vtx = nk_draw_list_alloc_vertices(list, vtx_count);
        nk_draw_index *ids = nk_draw_list_alloc_elements(list, idx_count);

        nk_size size = 0;
        struct nk_vec2 *normals = 0;
        unsigned int vtx_inner_idx = (unsigned int)(index + 0);
        unsigned int vtx_outer_idx = (unsigned int)(index + 1);
        if (!vtx || !ids) return;

        /* temporary allocate normals */
        vertex_offset = (nk_size)((nk_byte*)vtx - (nk_byte*)list->vertices->memory.ptr);
        nk_buffer_mark(list->vertices, NK_BUFFER_FRONT);
        size = pnt_size * points_count;
        normals = (struct nk_vec2*) nk_buffer_alloc(list->vertices, NK_BUFFER_FRONT, size, pnt_align);
        NK_ASSERT(normals);
        if (!normals) return;
        vtx = (void*)((nk_byte*)list->vertices->memory.ptr + vertex_offset);

        /* add elements */
        for (i = 2; i < points_count; i++) {
            ids[0] = (nk_draw_index)(vtx_inner_idx);
            ids[1] = (nk_draw_index)(vtx_inner_idx + ((i-1) << 1));
            ids[2] = (nk_draw_index)(vtx_inner_idx + (i << 1));
            ids += 3;
        }

        /* compute normals */
        for (i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++) {
            struct nk_vec2 p0 = points[i0];
            struct nk_vec2 p1 = points[i1];
            struct nk_vec2 diff = nk_vec2_sub(p1, p0);

            /* vec2 inverted length  */
            float len = nk_vec2_len_sqr(diff);
            if (len != 0.0f)
                len = nk_inv_sqrt(len);
            else len = 1.0f;
            diff = nk_vec2_muls(diff, len);

            normals[i0].x = diff.y;
            normals[i0].y = -diff.x;
        }

        /* add vertices + indexes */
        for (i0 = points_count-1, i1 = 0; i1 < points_count; i0 = i1++) {
            const struct nk_vec2 uv = list->config.null.uv;
            struct nk_vec2 n0 = normals[i0];
            struct nk_vec2 n1 = normals[i1];
            struct nk_vec2 dm = nk_vec2_muls(nk_vec2_add(n0, n1), 0.5f);
            float dmr2 = dm.x*dm.x + dm.y*dm.y;
            if (dmr2 > 0.000001f) {
                float scale = 1.0f / dmr2;
                scale = NK_MIN(scale, 100.0f);
                dm = nk_vec2_muls(dm, scale);
            }
            dm = nk_vec2_muls(dm, AA_SIZE * 0.5f);

            /* add vertices */
            vtx = nk_draw_vertex(vtx, &list->config, nk_vec2_sub(points[i1], dm), uv, col);
            vtx = nk_draw_vertex(vtx, &list->config, nk_vec2_add(points[i1], dm), uv, col_trans);

            /* add indexes */
            ids[0] = (nk_draw_index)(vtx_inner_idx+(i1<<1));
            ids[1] = (nk_draw_index)(vtx_inner_idx+(i0<<1));
            ids[2] = (nk_draw_index)(vtx_outer_idx+(i0<<1));
            ids[3] = (nk_draw_index)(vtx_outer_idx+(i0<<1));
            ids[4] = (nk_draw_index)(vtx_outer_idx+(i1<<1));
            ids[5] = (nk_draw_index)(vtx_inner_idx+(i1<<1));
            ids += 6;
        }
        /* free temporary normals + points */
        nk_buffer_reset(list->vertices, NK_BUFFER_FRONT);
    } else {
        nk_size i = 0;
        nk_size index = list->vertex_count;
        const nk_size idx_count = (points_count-2)*3;
        const nk_size vtx_count = points_count;
        void *vtx = nk_draw_list_alloc_vertices(list, vtx_count);
        nk_draw_index *ids = nk_draw_list_alloc_elements(list, idx_count);

        if (!vtx || !ids) return;
        for (i = 0; i < vtx_count; ++i)
            vtx = nk_draw_vertex(vtx, &list->config, points[i], list->config.null.uv, col);
        for (i = 2; i < points_count; ++i) {
            ids[0] = (nk_draw_index)index;
            ids[1] = (nk_draw_index)(index+ i - 1);
            ids[2] = (nk_draw_index)(index+i);
            ids += 3;
        }
    }
}

NK_API void
nk_draw_list_path_clear(struct nk_draw_list *list)
{
    NK_ASSERT(list);
    if (!list) return;
    nk_buffer_reset(list->buffer, NK_BUFFER_FRONT);
    list->path_count = 0;
    list->path_offset = 0;
}

NK_API void
nk_draw_list_path_line_to(struct nk_draw_list *list, struct nk_vec2 pos)
{
    struct nk_vec2 *points = 0;
    struct nk_draw_command *cmd = 0;
    NK_ASSERT(list);
    if (!list) return;
    if (!list->cmd_count)
        nk_draw_list_add_clip(list, nk_null_rect);

    cmd = nk_draw_list_command_last(list);
    if (cmd && cmd->texture.ptr != list->config.null.texture.ptr)
        nk_draw_list_push_image(list, list->config.null.texture);

    points = nk_draw_list_alloc_path(list, 1);
    if (!points) return;
    points[0] = pos;
}

NK_API void
nk_draw_list_path_arc_to_fast(struct nk_draw_list *list, struct nk_vec2 center,
    float radius, int a_min, int a_max)
{
    int a = 0;
    NK_ASSERT(list);
    if (!list) return;
    if (a_min <= a_max) {
        for (a = a_min; a <= a_max; a++) {
            const struct nk_vec2 c = list->circle_vtx[(nk_size)a % NK_LEN(list->circle_vtx)];
            const float x = center.x + c.x * radius;
            const float y = center.y + c.y * radius;
            nk_draw_list_path_line_to(list, nk_vec2(x, y));
        }
    }
}

NK_API void
nk_draw_list_path_arc_to(struct nk_draw_list *list, struct nk_vec2 center,
    float radius, float a_min, float a_max, unsigned int segments)
{
    unsigned int i = 0;
    NK_ASSERT(list);
    if (!list) return;
    if (radius == 0.0f) return;

    /*  This algorithm for arc drawing relies on these two trigonometric identities[1]:
            sin(a + b) = sin(a) * cos(b) + cos(a) * sin(b)
            cos(a + b) = cos(a) * cos(b) - sin(a) * sin(b)

        Two coordinates (x, y) of a point on a circle centered on
        the origin can be written in polar form as:
            x = r * cos(a)
            y = r * sin(a)
        where r is the radius of the circle,
            a is the angle between (x, y) and the origin.

        This allows us to rotate the coordinates around the
        origin by an angle b using the following transformation:
            x' = r * cos(a + b) = x * cos(b) - y * sin(b)
            y' = r * sin(a + b) = y * cos(b) + x * sin(b)

        [1] https://en.wikipedia.org/wiki/List_of_trigonometric_identities#Angle_sum_and_difference_identities
    */
    const float d_angle = (a_max - a_min) / (float)segments;
    const float sin_d = (float)NK_SIN(d_angle);
    const float cos_d = (float)NK_COS(d_angle);

    float cx = (float)NK_COS(a_min) * radius;
    float cy = (float)NK_SIN(a_min) * radius;
    for(i = 0; i <= segments; ++i) {
        const float x = center.x + cx;
        const float y = center.y + cy;
        nk_draw_list_path_line_to(list, nk_vec2(x, y));

        const float new_cx = cx * cos_d - cy * sin_d;
        const float new_cy = cy * cos_d + cx * sin_d;
        cx = new_cx;
        cy = new_cy;
    }
}

NK_API void
nk_draw_list_path_rect_to(struct nk_draw_list *list, struct nk_vec2 a,
    struct nk_vec2 b, float rounding)
{
    float r;
    NK_ASSERT(list);
    if (!list) return;
    r = rounding;
    r = NK_MIN(r, ((b.x-a.x) < 0) ? -(b.x-a.x): (b.x-a.x));
    r = NK_MIN(r, ((b.y-a.y) < 0) ? -(b.y-a.y): (b.y-a.y));

    if (r == 0.0f) {
        nk_draw_list_path_line_to(list, a);
        nk_draw_list_path_line_to(list, nk_vec2(b.x,a.y));
        nk_draw_list_path_line_to(list, b);
        nk_draw_list_path_line_to(list, nk_vec2(a.x,b.y));
    } else {
        nk_draw_list_path_arc_to_fast(list, nk_vec2(a.x + r, a.y + r), r, 6, 9);
        nk_draw_list_path_arc_to_fast(list, nk_vec2(b.x - r, a.y + r), r, 9, 12);
        nk_draw_list_path_arc_to_fast(list, nk_vec2(b.x - r, b.y - r), r, 0, 3);
        nk_draw_list_path_arc_to_fast(list, nk_vec2(a.x + r, b.y - r), r, 3, 6);
    }
}

NK_API void
nk_draw_list_path_curve_to(struct nk_draw_list *list, struct nk_vec2 p2,
    struct nk_vec2 p3, struct nk_vec2 p4, unsigned int num_segments)
{
    float t_step;
    unsigned int i_step;
    struct nk_vec2 p1;

    NK_ASSERT(list);
    NK_ASSERT(list->path_count);
    if (!list || !list->path_count) return;
    num_segments = NK_MAX(num_segments, 1);

    p1 = nk_draw_list_path_last(list);
    t_step = 1.0f/(float)num_segments;
    for (i_step = 1; i_step <= num_segments; ++i_step) {
        float t = t_step * (float)i_step;
        float u = 1.0f - t;
        float w1 = u*u*u;
        float w2 = 3*u*u*t;
        float w3 = 3*u*t*t;
        float w4 = t * t *t;
        float x = w1 * p1.x + w2 * p2.x + w3 * p3.x + w4 * p4.x;
        float y = w1 * p1.y + w2 * p2.y + w3 * p3.y + w4 * p4.y;
        nk_draw_list_path_line_to(list, nk_vec2(x,y));
    }
}

NK_API void
nk_draw_list_path_fill(struct nk_draw_list *list, struct nk_color color)
{
    struct nk_vec2 *points;
    NK_ASSERT(list);
    if (!list) return;
    points = (struct nk_vec2*)nk_buffer_memory(list->buffer);
    nk_draw_list_fill_poly_convex(list, points, list->path_count, color, list->config.shape_AA);
    nk_draw_list_path_clear(list);
}

NK_API void
nk_draw_list_path_stroke(struct nk_draw_list *list, struct nk_color color,
    enum nk_draw_list_stroke closed, float thickness)
{
    struct nk_vec2 *points;
    NK_ASSERT(list);
    if (!list) return;
    points = (struct nk_vec2*)nk_buffer_memory(list->buffer);
    nk_draw_list_stroke_poly_line(list, points, list->path_count, color,
        closed, thickness, list->config.line_AA);
    nk_draw_list_path_clear(list);
}

NK_API void
nk_draw_list_stroke_line(struct nk_draw_list *list, struct nk_vec2 a,
    struct nk_vec2 b, struct nk_color col, float thickness)
{
    NK_ASSERT(list);
    if (!list || !col.a) return;
    if (list->line_AA == NK_ANTI_ALIASING_ON) {
        nk_draw_list_path_line_to(list, a);
        nk_draw_list_path_line_to(list, b);
    } else {
        nk_draw_list_path_line_to(list, nk_vec2_sub(a,nk_vec2(0.5f,0.5f)));
        nk_draw_list_path_line_to(list, nk_vec2_sub(b,nk_vec2(0.5f,0.5f)));
    }
    nk_draw_list_path_stroke(list,  col, NK_STROKE_OPEN, thickness);
}

NK_API void
nk_draw_list_fill_rect(struct nk_draw_list *list, struct nk_rect rect,
    struct nk_color col, float rounding)
{
    NK_ASSERT(list);
    if (!list || !col.a) return;

    if (list->line_AA == NK_ANTI_ALIASING_ON) {
        nk_draw_list_path_rect_to(list, nk_vec2(rect.x, rect.y),
            nk_vec2(rect.x + rect.w, rect.y + rect.h), rounding);
    } else {
        nk_draw_list_path_rect_to(list, nk_vec2(rect.x-0.5f, rect.y-0.5f),
            nk_vec2(rect.x + rect.w, rect.y + rect.h), rounding);
    } nk_draw_list_path_fill(list,  col);
}

NK_API void
nk_draw_list_stroke_rect(struct nk_draw_list *list, struct nk_rect rect,
    struct nk_color col, float rounding, float thickness)
{
    NK_ASSERT(list);
    if (!list || !col.a) return;
    if (list->line_AA == NK_ANTI_ALIASING_ON) {
        nk_draw_list_path_rect_to(list, nk_vec2(rect.x, rect.y),
            nk_vec2(rect.x + rect.w, rect.y + rect.h), rounding);
    } else {
        nk_draw_list_path_rect_to(list, nk_vec2(rect.x-0.5f, rect.y-0.5f),
            nk_vec2(rect.x + rect.w, rect.y + rect.h), rounding);
    } nk_draw_list_path_stroke(list,  col, NK_STROKE_CLOSED, thickness);
}

NK_API void
nk_draw_list_fill_rect_multi_color(struct nk_draw_list *list, struct nk_rect rect,
    struct nk_color left, struct nk_color top, struct nk_color right,
    struct nk_color bottom)
{
    void *vtx;
    struct nk_colorf col_left, col_top;
    struct nk_colorf col_right, col_bottom;
    nk_draw_index *idx;
    nk_draw_index index;

    nk_color_fv(&col_left.r, left);
    nk_color_fv(&col_right.r, right);
    nk_color_fv(&col_top.r, top);
    nk_color_fv(&col_bottom.r, bottom);

    NK_ASSERT(list);
    if (!list) return;

    nk_draw_list_push_image(list, list->config.null.texture);
    index = (nk_draw_index)list->vertex_count;
    vtx = nk_draw_list_alloc_vertices(list, 4);
    idx = nk_draw_list_alloc_elements(list, 6);
    if (!vtx || !idx) return;

    idx[0] = (nk_draw_index)(index+0); idx[1] = (nk_draw_index)(index+1);
    idx[2] = (nk_draw_index)(index+2); idx[3] = (nk_draw_index)(index+0);
    idx[4] = (nk_draw_index)(index+2); idx[5] = (nk_draw_index)(index+3);

    vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(rect.x, rect.y), list->config.null.uv, col_left);
    vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(rect.x + rect.w, rect.y), list->config.null.uv, col_top);
    vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(rect.x + rect.w, rect.y + rect.h), list->config.null.uv, col_right);
    vtx = nk_draw_vertex(vtx, &list->config, nk_vec2(rect.x, rect.y + rect.h), list->config.null.uv, col_bottom);
}

NK_API void
nk_draw_list_fill_triangle(struct nk_draw_list *list, struct nk_vec2 a,
    struct nk_vec2 b, struct nk_vec2 c, struct nk_color col)
{
    NK_ASSERT(list);
    if (!list || !col.a) return;
    nk_draw_list_path_line_to(list, a);
    nk_draw_list_path_line_to(list, b);
    nk_draw_list_path_line_to(list, c);
    nk_draw_list_path_fill(list, col);
}

NK_API void
nk_draw_list_stroke_triangle(struct nk_draw_list *list, struct nk_vec2 a,
    struct nk_vec2 b, struct nk_vec2 c, struct nk_color col, float thickness)
{
    NK_ASSERT(list);
    if (!list || !col.a) return;
    nk_draw_list_path_line_to(list, a);
    nk_draw_list_path_line_to(list, b);
    nk_draw_list_path_line_to(list, c);
    nk_draw_list_path_stroke(list, col, NK_STROKE_CLOSED, thickness);
}

NK_API void
nk_draw_list_fill_circle(struct nk_draw_list *list, struct nk_vec2 center,
    float radius, struct nk_color col, unsigned int segs)
{
    float a_max;
    NK_ASSERT(list);
    if (!list || !col.a) return;
    a_max = NK_PI * 2.0f * ((float)segs - 1.0f) / (float)segs;
    nk_draw_list_path_arc_to(list, center, radius, 0.0f, a_max, segs);
    nk_draw_list_path_fill(list, col);
}

NK_API void
nk_draw_list_stroke_circle(struct nk_draw_list *list, struct nk_vec2 center,
    float radius, struct nk_color col, unsigned int segs, float thickness)
{
    float a_max;
    NK_ASSERT(list);
    if (!list || !col.a) return;
    a_max = NK_PI * 2.0f * ((float)segs - 1.0f) / (float)segs;
    nk_draw_list_path_arc_to(list, center, radius, 0.0f, a_max, segs);
    nk_draw_list_path_stroke(list, col, NK_STROKE_CLOSED, thickness);
}

NK_API void
nk_draw_list_stroke_curve(struct nk_draw_list *list, struct nk_vec2 p0,
    struct nk_vec2 cp0, struct nk_vec2 cp1, struct nk_vec2 p1,
    struct nk_color col, unsigned int segments, float thickness)
{
    NK_ASSERT(list);
    if (!list || !col.a) return;
    nk_draw_list_path_line_to(list, p0);
    nk_draw_list_path_curve_to(list, cp0, cp1, p1, segments);
    nk_draw_list_path_stroke(list, col, NK_STROKE_OPEN, thickness);
}

NK_INTERN void
nk_draw_list_push_rect_uv(struct nk_draw_list *list, struct nk_vec2 a,
    struct nk_vec2 c, struct nk_vec2 uva, struct nk_vec2 uvc,
    struct nk_color color)
{
    void *vtx;
    struct nk_vec2 uvb;
    struct nk_vec2 uvd;
    struct nk_vec2 b;
    struct nk_vec2 d;

    struct nk_colorf col;
    nk_draw_index *idx;
    nk_draw_index index;
    NK_ASSERT(list);
    if (!list) return;

    nk_color_fv(&col.r, color);
    uvb = nk_vec2(uvc.x, uva.y);
    uvd = nk_vec2(uva.x, uvc.y);
    b = nk_vec2(c.x, a.y);
    d = nk_vec2(a.x, c.y);

    index = (nk_draw_index)list->vertex_count;
    vtx = nk_draw_list_alloc_vertices(list, 4);
    idx = nk_draw_list_alloc_elements(list, 6);
    if (!vtx || !idx) return;

    idx[0] = (nk_draw_index)(index+0); idx[1] = (nk_draw_index)(index+1);
    idx[2] = (nk_draw_index)(index+2); idx[3] = (nk_draw_index)(index+0);
    idx[4] = (nk_draw_index)(index+2); idx[5] = (nk_draw_index)(index+3);

    vtx = nk_draw_vertex(vtx, &list->config, a, uva, col);
    vtx = nk_draw_vertex(vtx, &list->config, b, uvb, col);
    vtx = nk_draw_vertex(vtx, &list->config, c, uvc, col);
    vtx = nk_draw_vertex(vtx, &list->config, d, uvd, col);
}

NK_API void
nk_draw_list_add_image(struct nk_draw_list *list, struct nk_image texture,
    struct nk_rect rect, struct nk_color color)
{
    NK_ASSERT(list);
    if (!list) return;
    /* push new command with given texture */
    nk_draw_list_push_image(list, texture.handle);
    if (nk_image_is_subimage(&texture)) {
        /* add region inside of the texture  */
        struct nk_vec2 uv[2];
        uv[0].x = (float)texture.region[0]/(float)texture.w;
        uv[0].y = (float)texture.region[1]/(float)texture.h;
        uv[1].x = (float)(texture.region[0] + texture.region[2])/(float)texture.w;
        uv[1].y = (float)(texture.region[1] + texture.region[3])/(float)texture.h;
        nk_draw_list_push_rect_uv(list, nk_vec2(rect.x, rect.y),
            nk_vec2(rect.x + rect.w, rect.y + rect.h),  uv[0], uv[1], color);
    } else nk_draw_list_push_rect_uv(list, nk_vec2(rect.x, rect.y),
            nk_vec2(rect.x + rect.w, rect.y + rect.h),
            nk_vec2(0.0f, 0.0f), nk_vec2(1.0f, 1.0f),color);
}

NK_API void
nk_draw_list_add_text(struct nk_draw_list *list, const struct nk_user_font *font,
    struct nk_rect rect, const char *text, int len, float font_height,
    struct nk_color fg)
{
    float x = 0;
    int text_len = 0;
    nk_rune unicode = 0;
    nk_rune next = 0;
    int glyph_len = 0;
    int next_glyph_len = 0;
    struct nk_user_font_glyph g;

    NK_ASSERT(list);
    if (!list || !len || !text) return;
    if (!NK_INTERSECT(rect.x, rect.y, rect.w, rect.h,
        list->clip_rect.x, list->clip_rect.y, list->clip_rect.w, list->clip_rect.h)) return;

    nk_draw_list_push_image(list, font->texture);
    x = rect.x;
    glyph_len = nk_utf_decode(text, &unicode, len);
    if (!glyph_len) return;

    /* draw every glyph image */
    fg.a = (nk_byte)((float)fg.a * list->config.global_alpha);
    while (text_len < len && glyph_len) {
        float gx, gy, gh, gw;
        float char_width = 0;
        if (unicode == NK_UTF_INVALID) break;

        /* query currently drawn glyph information */
        next_glyph_len = nk_utf_decode(text + text_len + glyph_len, &next, (int)len - text_len);
        font->query(font->userdata, font_height, &g, unicode,
                    (next == NK_UTF_INVALID) ? '\0' : next);

        /* calculate and draw glyph drawing rectangle and image */
        gx = x + g.offset.x;
        gy = rect.y + g.offset.y;
        gw = g.width; gh = g.height;
        char_width = g.xadvance;
        nk_draw_list_push_rect_uv(list, nk_vec2(gx,gy), nk_vec2(gx + gw, gy+ gh),
            g.uv[0], g.uv[1], fg);

        /* offset next glyph */
        text_len += glyph_len;
        x += char_width;
        glyph_len = next_glyph_len;
        unicode = next;
    }
}

NK_API nk_flags
nk_convert(struct nk_context *ctx, struct nk_buffer *cmds,
    struct nk_buffer *vertices, struct nk_buffer *elements,
    const struct nk_convert_config *config)
{
    nk_flags res = NK_CONVERT_SUCCESS;
    const struct nk_command *cmd;
    NK_ASSERT(ctx);
    NK_ASSERT(cmds);
    NK_ASSERT(vertices);
    NK_ASSERT(elements);
    NK_ASSERT(config);
    NK_ASSERT(config->vertex_layout);
    NK_ASSERT(config->vertex_size);
    if (!ctx || !cmds || !vertices || !elements || !config || !config->vertex_layout)
        return NK_CONVERT_INVALID_PARAM;

    nk_draw_list_setup(&ctx->draw_list, config, cmds, vertices, elements,
        config->line_AA, config->shape_AA);
    nk_foreach(cmd, ctx)
    {
#ifdef NK_INCLUDE_COMMAND_USERDATA
        ctx->draw_list.userdata = cmd->userdata;
#endif
        switch (cmd->type) {
        case NK_COMMAND_NOP: break;
        case NK_COMMAND_SCISSOR: {
            const struct nk_command_scissor *s = (const struct nk_command_scissor*)cmd;
            nk_draw_list_add_clip(&ctx->draw_list, nk_rect(s->x, s->y, s->w, s->h));
        } break;
        case NK_COMMAND_LINE: {
            const struct nk_command_line *l = (const struct nk_command_line*)cmd;
            nk_draw_list_stroke_line(&ctx->draw_list, nk_vec2(l->begin.x, l->begin.y),
                nk_vec2(l->end.x, l->end.y), l->color, l->line_thickness);
        } break;
        case NK_COMMAND_CURVE: {
            const struct nk_command_curve *q = (const struct nk_command_curve*)cmd;
            nk_draw_list_stroke_curve(&ctx->draw_list, nk_vec2(q->begin.x, q->begin.y),
                nk_vec2(q->ctrl[0].x, q->ctrl[0].y), nk_vec2(q->ctrl[1].x,
                q->ctrl[1].y), nk_vec2(q->end.x, q->end.y), q->color,
                config->curve_segment_count, q->line_thickness);
        } break;
        case NK_COMMAND_RECT: {
            const struct nk_command_rect *r = (const struct nk_command_rect*)cmd;
            nk_draw_list_stroke_rect(&ctx->draw_list, nk_rect(r->x, r->y, r->w, r->h),
                r->color, (float)r->rounding, r->line_thickness);
        } break;
        case NK_COMMAND_RECT_FILLED: {
            const struct nk_command_rect_filled *r = (const struct nk_command_rect_filled*)cmd;
            nk_draw_list_fill_rect(&ctx->draw_list, nk_rect(r->x, r->y, r->w, r->h),
                r->color, (float)r->rounding);
        } break;
        case NK_COMMAND_RECT_MULTI_COLOR: {
            const struct nk_command_rect_multi_color *r = (const struct nk_command_rect_multi_color*)cmd;
            nk_draw_list_fill_rect_multi_color(&ctx->draw_list, nk_rect(r->x, r->y, r->w, r->h),
                r->left, r->top, r->right, r->bottom);
        } break;
        case NK_COMMAND_CIRCLE: {
            const struct nk_command_circle *c = (const struct nk_command_circle*)cmd;
            nk_draw_list_stroke_circle(&ctx->draw_list, nk_vec2((float)c->x + (float)c->w/2,
                (float)c->y + (float)c->h/2), (float)c->w/2, c->color,
                config->circle_segment_count, c->line_thickness);
        } break;
        case NK_COMMAND_CIRCLE_FILLED: {
            const struct nk_command_circle_filled *c = (const struct nk_command_circle_filled *)cmd;
            nk_draw_list_fill_circle(&ctx->draw_list, nk_vec2((float)c->x + (float)c->w/2,
                (float)c->y + (float)c->h/2), (float)c->w/2, c->color,
                config->circle_segment_count);
        } break;
        case NK_COMMAND_ARC: {
            const struct nk_command_arc *c = (const struct nk_command_arc*)cmd;
            nk_draw_list_path_line_to(&ctx->draw_list, nk_vec2(c->cx, c->cy));
            nk_draw_list_path_arc_to(&ctx->draw_list, nk_vec2(c->cx, c->cy), c->r,
                c->a[0], c->a[1], config->arc_segment_count);
            nk_draw_list_path_stroke(&ctx->draw_list, c->color, NK_STROKE_CLOSED, c->line_thickness);
        } break;
        case NK_COMMAND_ARC_FILLED: {
            const struct nk_command_arc_filled *c = (const struct nk_command_arc_filled*)cmd;
            nk_draw_list_path_line_to(&ctx->draw_list, nk_vec2(c->cx, c->cy));
            nk_draw_list_path_arc_to(&ctx->draw_list, nk_vec2(c->cx, c->cy), c->r,
                c->a[0], c->a[1], config->arc_segment_count);
            nk_draw_list_path_fill(&ctx->draw_list, c->color);
        } break;
        case NK_COMMAND_TRIANGLE: {
            const struct nk_command_triangle *t = (const struct nk_command_triangle*)cmd;
            nk_draw_list_stroke_triangle(&ctx->draw_list, nk_vec2(t->a.x, t->a.y),
                nk_vec2(t->b.x, t->b.y), nk_vec2(t->c.x, t->c.y), t->color,
                t->line_thickness);
        } break;
        case NK_COMMAND_TRIANGLE_FILLED: {
            const struct nk_command_triangle_filled *t = (const struct nk_command_triangle_filled*)cmd;
            nk_draw_list_fill_triangle(&ctx->draw_list, nk_vec2(t->a.x, t->a.y),
                nk_vec2(t->b.x, t->b.y), nk_vec2(t->c.x, t->c.y), t->color);
        } break;
        case NK_COMMAND_POLYGON: {
            int i;
            const struct nk_command_polygon*p = (const struct nk_command_polygon*)cmd;
            for (i = 0; i < p->point_count; ++i) {
                struct nk_vec2 pnt = nk_vec2((float)p->points[i].x, (float)p->points[i].y);
                nk_draw_list_path_line_to(&ctx->draw_list, pnt);
            }
            nk_draw_list_path_stroke(&ctx->draw_list, p->color, NK_STROKE_CLOSED, p->line_thickness);
        } break;
        case NK_COMMAND_POLYGON_FILLED: {
            int i;
            const struct nk_command_polygon_filled *p = (const struct nk_command_polygon_filled*)cmd;
            for (i = 0; i < p->point_count; ++i) {
                struct nk_vec2 pnt = nk_vec2((float)p->points[i].x, (float)p->points[i].y);
                nk_draw_list_path_line_to(&ctx->draw_list, pnt);
            }
            nk_draw_list_path_fill(&ctx->draw_list, p->color);
        } break;
        case NK_COMMAND_POLYLINE: {
            int i;
            const struct nk_command_polyline *p = (const struct nk_command_polyline*)cmd;
            for (i = 0; i < p->point_count; ++i) {
                struct nk_vec2 pnt = nk_vec2((float)p->points[i].x, (float)p->points[i].y);
                nk_draw_list_path_line_to(&ctx->draw_list, pnt);
            }
            nk_draw_list_path_stroke(&ctx->draw_list, p->color, NK_STROKE_OPEN, p->line_thickness);
        } break;
        case NK_COMMAND_TEXT: {
            const struct nk_command_text *t = (const struct nk_command_text*)cmd;
            nk_draw_list_add_text(&ctx->draw_list, t->font, nk_rect(t->x, t->y, t->w, t->h),
                t->string, t->length, t->height, t->foreground);
        } break;
        case NK_COMMAND_IMAGE: {
            const struct nk_command_image *i = (const struct nk_command_image*)cmd;
            nk_draw_list_add_image(&ctx->draw_list, i->img, nk_rect(i->x, i->y, i->w, i->h), i->col);
        } break;
        case NK_COMMAND_CUSTOM: {
            const struct nk_command_custom *c = (const struct nk_command_custom*)cmd;
            c->callback(&ctx->draw_list, c->x, c->y, c->w, c->h, c->callback_data);
        } break;
        default: break;
        }
    }
    res |= (cmds->needed > cmds->allocated + (cmds->memory.size - cmds->size)) ? NK_CONVERT_COMMAND_BUFFER_FULL: 0;
    res |= (vertices->needed > vertices->allocated) ? NK_CONVERT_VERTEX_BUFFER_FULL: 0;
    res |= (elements->needed > elements->allocated) ? NK_CONVERT_ELEMENT_BUFFER_FULL: 0;
    return res;
}
NK_API const struct nk_draw_command*
nk__draw_begin(const struct nk_context *ctx,
    const struct nk_buffer *buffer)
{return nk__draw_list_begin(&ctx->draw_list, buffer);}

NK_API const struct nk_draw_command*
nk__draw_end(const struct nk_context *ctx, const struct nk_buffer *buffer)
{return nk__draw_list_end(&ctx->draw_list, buffer);}

NK_API const struct nk_draw_command*
nk__draw_next(const struct nk_draw_command *cmd,
    const struct nk_buffer *buffer, const struct nk_context *ctx)
{return nk__draw_list_next(cmd, buffer, &ctx->draw_list);}

#endif

/*
 * ==============================================================
 *
 *                          FONT HANDLING
 *
 * ===============================================================
 */
#ifdef NK_INCLUDE_FONT_BAKING
/* -------------------------------------------------------------
 *
 *                          RECT PACK
 *
 * --------------------------------------------------------------*/
/* stb_rect_pack.h - v0.05 - public domain - rectangle packing */
/* Sean Barrett 2014 */
#define NK_RP__MAXVAL  0xffff
typedef unsigned short nk_rp_coord;

struct nk_rp_rect {
    /* reserved for your use: */
    int id;
    /* input: */
    nk_rp_coord w, h;
    /* output: */
    nk_rp_coord x, y;
    int was_packed;
    /* non-zero if valid packing */
}; /* 16 bytes, nominally */

struct nk_rp_node {
    nk_rp_coord  x,y;
    struct nk_rp_node  *next;
};

struct nk_rp_context {
    int width;
    int height;
    int align;
    int init_mode;
    int heuristic;
    int num_nodes;
    struct nk_rp_node *active_head;
    struct nk_rp_node *free_head;
    struct nk_rp_node extra[2];
    /* we allocate two extra nodes so optimal user-node-count is 'width' not 'width+2' */
};

struct nk_rp__findresult {
    int x,y;
    struct nk_rp_node **prev_link;
};

enum NK_RP_HEURISTIC {
    NK_RP_HEURISTIC_Skyline_default=0,
    NK_RP_HEURISTIC_Skyline_BL_sortHeight = NK_RP_HEURISTIC_Skyline_default,
    NK_RP_HEURISTIC_Skyline_BF_sortHeight
};
enum NK_RP_INIT_STATE{NK_RP__INIT_skyline = 1};

NK_INTERN void
nk_rp_setup_allow_out_of_mem(struct nk_rp_context *context, int allow_out_of_mem)
{
    if (allow_out_of_mem)
        /* if it's ok to run out of memory, then don't bother aligning them; */
        /* this gives better packing, but may fail due to OOM (even though */
        /* the rectangles easily fit). @TODO a smarter approach would be to only */
        /* quantize once we've hit OOM, then we could get rid of this parameter. */
        context->align = 1;
    else {
        /* if it's not ok to run out of memory, then quantize the widths */
        /* so that num_nodes is always enough nodes. */
        /* */
        /* I.e. num_nodes * align >= width */
        /*                  align >= width / num_nodes */
        /*                  align = ceil(width/num_nodes) */
        context->align = (context->width + context->num_nodes-1) / context->num_nodes;
    }
}

NK_INTERN void
nk_rp_init_target(struct nk_rp_context *context, int width, int height,
    struct nk_rp_node *nodes, int num_nodes)
{
    int i;
#ifndef STBRP_LARGE_RECTS
    NK_ASSERT(width <= 0xffff && height <= 0xffff);
#endif

    for (i=0; i < num_nodes-1; ++i)
        nodes[i].next = &nodes[i+1];
    nodes[i].next = 0;
    context->init_mode = NK_RP__INIT_skyline;
    context->heuristic = NK_RP_HEURISTIC_Skyline_default;
    context->free_head = &nodes[0];
    context->active_head = &context->extra[0];
    context->width = width;
    context->height = height;
    context->num_nodes = num_nodes;
    nk_rp_setup_allow_out_of_mem(context, 0);

    /* node 0 is the full width, node 1 is the sentinel (lets us not store width explicitly) */
    context->extra[0].x = 0;
    context->extra[0].y = 0;
    context->extra[0].next = &context->extra[1];
    context->extra[1].x = (nk_rp_coord) width;
    context->extra[1].y = 65535;
    context->extra[1].next = 0;
}

/* find minimum y position if it starts at x1 */
NK_INTERN int
nk_rp__skyline_find_min_y(struct nk_rp_context *c, struct nk_rp_node *first,
    int x0, int width, int *pwaste)
{
    struct nk_rp_node *node = first;
    int x1 = x0 + width;
    int min_y, visited_width, waste_area;
    NK_ASSERT(first->x <= x0);
    NK_UNUSED(c);

    NK_ASSERT(node->next->x > x0);
    /* we ended up handling this in the caller for efficiency */
    NK_ASSERT(node->x <= x0);

    min_y = 0;
    waste_area = 0;
    visited_width = 0;
    while (node->x < x1)
    {
        if (node->y > min_y) {
            /* raise min_y higher. */
            /* we've accounted for all waste up to min_y, */
            /* but we'll now add more waste for everything we've visited */
            waste_area += visited_width * (node->y - min_y);
            min_y = node->y;
            /* the first time through, visited_width might be reduced */
            if (node->x < x0)
            visited_width += node->next->x - x0;
            else
            visited_width += node->next->x - node->x;
        } else {
            /* add waste area */
            int under_width = node->next->x - node->x;
            if (under_width + visited_width > width)
            under_width = width - visited_width;
            waste_area += under_width * (min_y - node->y);
            visited_width += under_width;
        }
        node = node->next;
    }
    *pwaste = waste_area;
    return min_y;
}

NK_INTERN struct nk_rp__findresult
nk_rp__skyline_find_best_pos(struct nk_rp_context *c, int width, int height)
{
    int best_waste = (1<<30), best_x, best_y = (1 << 30);
    struct nk_rp__findresult fr;
    struct nk_rp_node **prev, *node, *tail, **best = 0;

    /* align to multiple of c->align */
    width = (width + c->align - 1);
    width -= width % c->align;
    NK_ASSERT(width % c->align == 0);

    node = c->active_head;
    prev = &c->active_head;
    while (node->x + width <= c->width) {
        int y,waste;
        y = nk_rp__skyline_find_min_y(c, node, node->x, width, &waste);
        /* actually just want to test BL */
        if (c->heuristic == NK_RP_HEURISTIC_Skyline_BL_sortHeight) {
            /* bottom left */
            if (y < best_y) {
            best_y = y;
            best = prev;
            }
        } else {
            /* best-fit */
            if (y + height <= c->height) {
                /* can only use it if it first vertically */
                if (y < best_y || (y == best_y && waste < best_waste)) {
                    best_y = y;
                    best_waste = waste;
                    best = prev;
                }
            }
        }
        prev = &node->next;
        node = node->next;
    }
    best_x = (best == 0) ? 0 : (*best)->x;

    /* if doing best-fit (BF), we also have to try aligning right edge to each node position */
    /* */
    /* e.g, if fitting */
    /* */
    /*     ____________________ */
    /*    |____________________| */
    /* */
    /*            into */
    /* */
    /*   |                         | */
    /*   |             ____________| */
    /*   |____________| */
    /* */
    /* then right-aligned reduces waste, but bottom-left BL is always chooses left-aligned */
    /* */
    /* This makes BF take about 2x the time */
    if (c->heuristic == NK_RP_HEURISTIC_Skyline_BF_sortHeight)
    {
        tail = c->active_head;
        node = c->active_head;
        prev = &c->active_head;
        /* find first node that's admissible */
        while (tail->x < width)
            tail = tail->next;
        while (tail)
        {
            int xpos = tail->x - width;
            int y,waste;
            NK_ASSERT(xpos >= 0);
            /* find the left position that matches this */
            while (node->next->x <= xpos) {
                prev = &node->next;
                node = node->next;
            }
            NK_ASSERT(node->next->x > xpos && node->x <= xpos);
            y = nk_rp__skyline_find_min_y(c, node, xpos, width, &waste);
            if (y + height < c->height) {
                if (y <= best_y) {
                    if (y < best_y || waste < best_waste || (waste==best_waste && xpos < best_x)) {
                        best_x = xpos;
                        NK_ASSERT(y <= best_y);
                        best_y = y;
                        best_waste = waste;
                        best = prev;
                    }
                }
            }
            tail = tail->next;
        }
    }
    fr.prev_link = best;
    fr.x = best_x;
    fr.y = best_y;
    return fr;
}

NK_INTERN struct nk_rp__findresult
nk_rp__skyline_pack_rectangle(struct nk_rp_context *context, int width, int height)
{
    /* find best position according to heuristic */
    struct nk_rp__findresult res = nk_rp__skyline_find_best_pos(context, width, height);
    struct nk_rp_node *node, *cur;

    /* bail if: */
    /*    1. it failed */
    /*    2. the best node doesn't fit (we don't always check this) */
    /*    3. we're out of memory */
    if (res.prev_link == 0 || res.y + height > context->height || context->free_head == 0) {
        res.prev_link = 0;
        return res;
    }

    /* on success, create new node */
    node = context->free_head;
    node->x = (nk_rp_coord) res.x;
    node->y = (nk_rp_coord) (res.y + height);

    context->free_head = node->next;

    /* insert the new node into the right starting point, and */
    /* let 'cur' point to the remaining nodes needing to be */
    /* stitched back in */
    cur = *res.prev_link;
    if (cur->x < res.x) {
        /* preserve the existing one, so start testing with the next one */
        struct nk_rp_node *next = cur->next;
        cur->next = node;
        cur = next;
    } else {
        *res.prev_link = node;
    }

    /* from here, traverse cur and free the nodes, until we get to one */
    /* that shouldn't be freed */
    while (cur->next && cur->next->x <= res.x + width) {
        struct nk_rp_node *next = cur->next;
        /* move the current node to the free list */
        cur->next = context->free_head;
        context->free_head = cur;
        cur = next;
    }
    /* stitch the list back in */
    node->next = cur;

    if (cur->x < res.x + width)
        cur->x = (nk_rp_coord) (res.x + width);
    return res;
}

NK_INTERN int
nk_rect_height_compare(const void *a, const void *b)
{
    const struct nk_rp_rect *p = (const struct nk_rp_rect *) a;
    const struct nk_rp_rect *q = (const struct nk_rp_rect *) b;
    if (p->h > q->h)
        return -1;
    if (p->h < q->h)
        return  1;
    return (p->w > q->w) ? -1 : (p->w < q->w);
}

NK_INTERN int
nk_rect_original_order(const void *a, const void *b)
{
    const struct nk_rp_rect *p = (const struct nk_rp_rect *) a;
    const struct nk_rp_rect *q = (const struct nk_rp_rect *) b;
    return (p->was_packed < q->was_packed) ? -1 : (p->was_packed > q->was_packed);
}

NK_INTERN void
nk_rp_qsort(struct nk_rp_rect *array, unsigned int len, int(*cmp)(const void*,const void*))
{
    /* iterative quick sort */
    #define NK_MAX_SORT_STACK 64
    unsigned right, left = 0, stack[NK_MAX_SORT_STACK], pos = 0;
    unsigned seed = len/2 * 69069+1;
    for (;;) {
        for (; left+1 < len; len++) {
            struct nk_rp_rect pivot, tmp;
            if (pos == NK_MAX_SORT_STACK) len = stack[pos = 0];
            pivot = array[left+seed%(len-left)];
            seed = seed * 69069 + 1;
            stack[pos++] = len;
            for (right = left-1;;) {
                while (cmp(&array[++right], &pivot) < 0);
                while (cmp(&pivot, &array[--len]) < 0);
                if (right >= len) break;
                tmp = array[right];
                array[right] = array[len];
                array[len] = tmp;
            }
        }
        if (pos == 0) break;
        left = len;
        len = stack[--pos];
    }
    #undef NK_MAX_SORT_STACK
}

NK_INTERN void
nk_rp_pack_rects(struct nk_rp_context *context, struct nk_rp_rect *rects, int num_rects)
{
    int i;
    /* we use the 'was_packed' field internally to allow sorting/unsorting */
    for (i=0; i < num_rects; ++i) {
        rects[i].was_packed = i;
    }

    /* sort according to heuristic */
    nk_rp_qsort(rects, (unsigned)num_rects, nk_rect_height_compare);

    for (i=0; i < num_rects; ++i) {
        struct nk_rp__findresult fr = nk_rp__skyline_pack_rectangle(context, rects[i].w, rects[i].h);
        if (fr.prev_link) {
            rects[i].x = (nk_rp_coord) fr.x;
            rects[i].y = (nk_rp_coord) fr.y;
        } else {
            rects[i].x = rects[i].y = NK_RP__MAXVAL;
        }
    }

    /* unsort */
    nk_rp_qsort(rects, (unsigned)num_rects, nk_rect_original_order);

    /* set was_packed flags */
    for (i=0; i < num_rects; ++i)
        rects[i].was_packed = !(rects[i].x == NK_RP__MAXVAL && rects[i].y == NK_RP__MAXVAL);
}

/*
 * ==============================================================
 *
 *                          TRUETYPE
 *
 * ===============================================================
 */
/* stb_truetype.h - v1.07 - public domain */
#define NK_TT_MAX_OVERSAMPLE   8
#define NK_TT__OVER_MASK  (NK_TT_MAX_OVERSAMPLE-1)

struct nk_tt_bakedchar {
    unsigned short x0,y0,x1,y1;
    /* coordinates of bbox in bitmap */
    float xoff,yoff,xadvance;
};

struct nk_tt_aligned_quad{
    float x0,y0,s0,t0; /* top-left */
    float x1,y1,s1,t1; /* bottom-right */
};

struct nk_tt_packedchar {
    unsigned short x0,y0,x1,y1;
    /* coordinates of bbox in bitmap */
    float xoff,yoff,xadvance;
    float xoff2,yoff2;
};

struct nk_tt_pack_range {
    float font_size;
    int first_unicode_codepoint_in_range;
    /* if non-zero, then the chars are continuous, and this is the first codepoint */
    int *array_of_unicode_codepoints;
    /* if non-zero, then this is an array of unicode codepoints */
    int num_chars;
    struct nk_tt_packedchar *chardata_for_range; /* output */
    unsigned char h_oversample, v_oversample;
    /* don't set these, they're used internally */
};

struct nk_tt_pack_context {
    void *pack_info;
    int   width;
    int   height;
    int   stride_in_bytes;
    int   padding;
    unsigned int   h_oversample, v_oversample;
    unsigned char *pixels;
    void  *nodes;
};

struct nk_tt_fontinfo {
    const unsigned char* data; /* pointer to .ttf file */
    int fontstart;/* offset of start of font */
    int numGlyphs;/* number of glyphs, needed for range checking */
    int loca,head,glyf,hhea,hmtx,kern; /* table locations as offset from start of .ttf */
    int index_map; /* a cmap mapping for our chosen character encoding */
    int indexToLocFormat; /* format needed to map from glyph index to glyph */
};

enum {
  NK_TT_vmove=1,
  NK_TT_vline,
  NK_TT_vcurve
};

struct nk_tt_vertex {
    short x,y,cx,cy;
    unsigned char type,padding;
};

struct nk_tt__bitmap{
   int w,h,stride;
   unsigned char *pixels;
};

struct nk_tt__hheap_chunk {
    struct nk_tt__hheap_chunk *next;
};
struct nk_tt__hheap {
    struct nk_allocator alloc;
    struct nk_tt__hheap_chunk *head;
    void   *first_free;
    int    num_remaining_in_head_chunk;
};

struct nk_tt__edge {
    float x0,y0, x1,y1;
    int invert;
};

struct nk_tt__active_edge {
    struct nk_tt__active_edge *next;
    float fx,fdx,fdy;
    float direction;
    float sy;
    float ey;
};
struct nk_tt__point {float x,y;};

#define NK_TT_MACSTYLE_DONTCARE     0
#define NK_TT_MACSTYLE_BOLD         1
#define NK_TT_MACSTYLE_ITALIC       2
#define NK_TT_MACSTYLE_UNDERSCORE   4
#define NK_TT_MACSTYLE_NONE         8
/* <= not same as 0, this makes us check the bitfield is 0 */

enum { /* platformID */
   NK_TT_PLATFORM_ID_UNICODE   =0,
   NK_TT_PLATFORM_ID_MAC       =1,
   NK_TT_PLATFORM_ID_ISO       =2,
   NK_TT_PLATFORM_ID_MICROSOFT =3
};

enum { /* encodingID for NK_TT_PLATFORM_ID_UNICODE */
   NK_TT_UNICODE_EID_UNICODE_1_0    =0,
   NK_TT_UNICODE_EID_UNICODE_1_1    =1,
   NK_TT_UNICODE_EID_ISO_10646      =2,
   NK_TT_UNICODE_EID_UNICODE_2_0_BMP=3,
   NK_TT_UNICODE_EID_UNICODE_2_0_FULL=4
};

enum { /* encodingID for NK_TT_PLATFORM_ID_MICROSOFT */
   NK_TT_MS_EID_SYMBOL        =0,
   NK_TT_MS_EID_UNICODE_BMP   =1,
   NK_TT_MS_EID_SHIFTJIS      =2,
   NK_TT_MS_EID_UNICODE_FULL  =10
};

enum { /* encodingID for NK_TT_PLATFORM_ID_MAC; same as Script Manager codes */
   NK_TT_MAC_EID_ROMAN        =0,   NK_TT_MAC_EID_ARABIC       =4,
   NK_TT_MAC_EID_JAPANESE     =1,   NK_TT_MAC_EID_HEBREW       =5,
   NK_TT_MAC_EID_CHINESE_TRAD =2,   NK_TT_MAC_EID_GREEK        =6,
   NK_TT_MAC_EID_KOREAN       =3,   NK_TT_MAC_EID_RUSSIAN      =7
};

enum { /* languageID for NK_TT_PLATFORM_ID_MICROSOFT; same as LCID... */
       /* problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs */
   NK_TT_MS_LANG_ENGLISH     =0x0409,   NK_TT_MS_LANG_ITALIAN     =0x0410,
   NK_TT_MS_LANG_CHINESE     =0x0804,   NK_TT_MS_LANG_JAPANESE    =0x0411,
   NK_TT_MS_LANG_DUTCH       =0x0413,   NK_TT_MS_LANG_KOREAN      =0x0412,
   NK_TT_MS_LANG_FRENCH      =0x040c,   NK_TT_MS_LANG_RUSSIAN     =0x0419,
   NK_TT_MS_LANG_GERMAN      =0x0407,   NK_TT_MS_LANG_SPANISH     =0x0409,
   NK_TT_MS_LANG_HEBREW      =0x040d,   NK_TT_MS_LANG_SWEDISH     =0x041D
};

enum { /* languageID for NK_TT_PLATFORM_ID_MAC */
   NK_TT_MAC_LANG_ENGLISH      =0 ,   NK_TT_MAC_LANG_JAPANESE     =11,
   NK_TT_MAC_LANG_ARABIC       =12,   NK_TT_MAC_LANG_KOREAN       =23,
   NK_TT_MAC_LANG_DUTCH        =4 ,   NK_TT_MAC_LANG_RUSSIAN      =32,
   NK_TT_MAC_LANG_FRENCH       =1 ,   NK_TT_MAC_LANG_SPANISH      =6 ,
   NK_TT_MAC_LANG_GERMAN       =2 ,   NK_TT_MAC_LANG_SWEDISH      =5 ,
   NK_TT_MAC_LANG_HEBREW       =10,   NK_TT_MAC_LANG_CHINESE_SIMPLIFIED =33,
   NK_TT_MAC_LANG_ITALIAN      =3 ,   NK_TT_MAC_LANG_CHINESE_TRAD =19
};

#define nk_ttBYTE(p)     (* (const nk_byte *) (p))
#define nk_ttCHAR(p)     (* (const char *) (p))

#if defined(NK_BIGENDIAN) && !defined(NK_ALLOW_UNALIGNED_TRUETYPE)
   #define nk_ttUSHORT(p)   (* (nk_ushort *) (p))
   #define nk_ttSHORT(p)    (* (nk_short *) (p))
   #define nk_ttULONG(p)    (* (nk_uint *) (p))
   #define nk_ttLONG(p)     (* (nk_int *) (p))
#else
    static nk_ushort nk_ttUSHORT(const nk_byte *p) { return (nk_ushort)(p[0]*256 + p[1]); }
    static nk_short nk_ttSHORT(const nk_byte *p)   { return (nk_short)(p[0]*256 + p[1]); }
    static nk_uint nk_ttULONG(const nk_byte *p)  { return (nk_uint)((p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]); }
#endif

#define nk_tt_tag4(p,c0,c1,c2,c3)\
    ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
#define nk_tt_tag(p,str) nk_tt_tag4(p,str[0],str[1],str[2],str[3])

NK_INTERN int nk_tt_GetGlyphShape(const struct nk_tt_fontinfo *info, struct nk_allocator *alloc,
                                int glyph_index, struct nk_tt_vertex **pvertices);

NK_INTERN nk_uint
nk_tt__find_table(const nk_byte *data, nk_uint fontstart, const char *tag)
{
    /* @OPTIMIZE: binary search */
    nk_int num_tables = nk_ttUSHORT(data+fontstart+4);
    nk_uint tabledir = fontstart + 12;
    nk_int i;
    for (i = 0; i < num_tables; ++i) {
        nk_uint loc = tabledir + (nk_uint)(16*i);
        if (nk_tt_tag(data+loc+0, tag))
            return nk_ttULONG(data+loc+8);
    }
    return 0;
}

NK_INTERN int
nk_tt_InitFont(struct nk_tt_fontinfo *info, const unsigned char *data2, int fontstart)
{
    nk_uint cmap, t;
    nk_int i,numTables;
    const nk_byte *data = (const nk_byte *) data2;

    info->data = data;
    info->fontstart = fontstart;

    cmap = nk_tt__find_table(data, (nk_uint)fontstart, "cmap");       /* required */
    info->loca = (int)nk_tt__find_table(data, (nk_uint)fontstart, "loca"); /* required */
    info->head = (int)nk_tt__find_table(data, (nk_uint)fontstart, "head"); /* required */
    info->glyf = (int)nk_tt__find_table(data, (nk_uint)fontstart, "glyf"); /* required */
    info->hhea = (int)nk_tt__find_table(data, (nk_uint)fontstart, "hhea"); /* required */
    info->hmtx = (int)nk_tt__find_table(data, (nk_uint)fontstart, "hmtx"); /* required */
    info->kern = (int)nk_tt__find_table(data, (nk_uint)fontstart, "kern"); /* not required */
    if (!cmap || !info->loca || !info->head || !info->glyf || !info->hhea || !info->hmtx)
        return 0;

    t = nk_tt__find_table(data, (nk_uint)fontstart, "maxp");
    if (t) info->numGlyphs = nk_ttUSHORT(data+t+4);
    else info->numGlyphs = 0xffff;

    /* find a cmap encoding table we understand *now* to avoid searching */
    /* later. (todo: could make this installable) */
    /* the same regardless of glyph. */
    numTables = nk_ttUSHORT(data + cmap + 2);
    info->index_map = 0;
    for (i=0; i < numTables; ++i)
    {
        nk_uint encoding_record = cmap + 4 + 8 * (nk_uint)i;
        /* find an encoding we understand: */
        switch(nk_ttUSHORT(data+encoding_record)) {
        case NK_TT_PLATFORM_ID_MICROSOFT:
            switch (nk_ttUSHORT(data+encoding_record+2)) {
            case NK_TT_MS_EID_UNICODE_BMP:
            case NK_TT_MS_EID_UNICODE_FULL:
                /* MS/Unicode */
                info->index_map = (int)(cmap + nk_ttULONG(data+encoding_record+4));
                break;
            default: break;
            } break;
        case NK_TT_PLATFORM_ID_UNICODE:
            /* Mac/iOS has these */
            /* all the encodingIDs are unicode, so we don't bother to check it */
            info->index_map = (int)(cmap + nk_ttULONG(data+encoding_record+4));
            break;
        default: break;
        }
    }
    if (info->index_map == 0)
        return 0;
    info->indexToLocFormat = nk_ttUSHORT(data+info->head + 50);
    return 1;
}

NK_INTERN int
nk_tt_FindGlyphIndex(const struct nk_tt_fontinfo *info, int unicode_codepoint)
{
    const nk_byte *data = info->data;
    nk_uint index_map = (nk_uint)info->index_map;

    nk_ushort format = nk_ttUSHORT(data + index_map + 0);
    if (format == 0) { /* apple byte encoding */
        nk_int bytes = nk_ttUSHORT(data + index_map + 2);
        if (unicode_codepoint < bytes-6)
            return nk_ttBYTE(data + index_map + 6 + unicode_codepoint);
        return 0;
    } else if (format == 6) {
        nk_uint first = nk_ttUSHORT(data + index_map + 6);
        nk_uint count = nk_ttUSHORT(data + index_map + 8);
        if ((nk_uint) unicode_codepoint >= first && (nk_uint) unicode_codepoint < first+count)
            return nk_ttUSHORT(data + index_map + 10 + (unicode_codepoint - (int)first)*2);
        return 0;
    } else if (format == 2) {
        NK_ASSERT(0); /* @TODO: high-byte mapping for japanese/chinese/korean */
        return 0;
    } else if (format == 4) { /* standard mapping for windows fonts: binary search collection of ranges */
        nk_ushort segcount = nk_ttUSHORT(data+index_map+6) >> 1;
        nk_ushort searchRange = nk_ttUSHORT(data+index_map+8) >> 1;
        nk_ushort entrySelector = nk_ttUSHORT(data+index_map+10);
        nk_ushort rangeShift = nk_ttUSHORT(data+index_map+12) >> 1;

        /* do a binary search of the segments */
        nk_uint endCount = index_map + 14;
        nk_uint search = endCount;

        if (unicode_codepoint > 0xffff)
            return 0;

        /* they lie from endCount .. endCount + segCount */
        /* but searchRange is the nearest power of two, so... */
        if (unicode_codepoint >= nk_ttUSHORT(data + search + rangeShift*2))
            search += (nk_uint)(rangeShift*2);

        /* now decrement to bias correctly to find smallest */
        search -= 2;
        while (entrySelector) {
            nk_ushort end;
            searchRange >>= 1;
            end = nk_ttUSHORT(data + search + searchRange*2);
            if (unicode_codepoint > end)
                search += (nk_uint)(searchRange*2);
            --entrySelector;
        }
        search += 2;

      {
         nk_ushort offset, start;
         nk_ushort item = (nk_ushort) ((search - endCount) >> 1);

         NK_ASSERT(unicode_codepoint <= nk_ttUSHORT(data + endCount + 2*item));
         start = nk_ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
         if (unicode_codepoint < start)
            return 0;

         offset = nk_ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
         if (offset == 0)
            return (nk_ushort) (unicode_codepoint + nk_ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));

         return nk_ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
      }
   } else if (format == 12 || format == 13) {
        nk_uint ngroups = nk_ttULONG(data+index_map+12);
        nk_int low,high;
        low = 0; high = (nk_int)ngroups;
        /* Binary search the right group. */
        while (low < high) {
            nk_int mid = low + ((high-low) >> 1); /* rounds down, so low <= mid < high */
            nk_uint start_char = nk_ttULONG(data+index_map+16+mid*12);
            nk_uint end_char = nk_ttULONG(data+index_map+16+mid*12+4);
            if ((nk_uint) unicode_codepoint < start_char)
                high = mid;
            else if ((nk_uint) unicode_codepoint > end_char)
                low = mid+1;
            else {
                nk_uint start_glyph = nk_ttULONG(data+index_map+16+mid*12+8);
                if (format == 12)
                    return (int)start_glyph + (int)unicode_codepoint - (int)start_char;
                else /* format == 13 */
                    return (int)start_glyph;
            }
        }
        return 0; /* not found */
    }
    /* @TODO */
    NK_ASSERT(0);
    return 0;
}

NK_INTERN void
nk_tt_setvertex(struct nk_tt_vertex *v, nk_byte type, nk_int x, nk_int y, nk_int cx, nk_int cy)
{
    v->type = type;
    v->x = (nk_short) x;
    v->y = (nk_short) y;
    v->cx = (nk_short) cx;
    v->cy = (nk_short) cy;
}

NK_INTERN int
nk_tt__GetGlyfOffset(const struct nk_tt_fontinfo *info, int glyph_index)
{
    int g1,g2;
    if (glyph_index >= info->numGlyphs) return -1; /* glyph index out of range */
    if (info->indexToLocFormat >= 2)    return -1; /* unknown index->glyph map format */

    if (info->indexToLocFormat == 0) {
        g1 = info->glyf + nk_ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
        g2 = info->glyf + nk_ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
    } else {
        g1 = info->glyf + (int)nk_ttULONG (info->data + info->loca + glyph_index * 4);
        g2 = info->glyf + (int)nk_ttULONG (info->data + info->loca + glyph_index * 4 + 4);
    }
    return g1==g2 ? -1 : g1; /* if length is 0, return -1 */
}

NK_INTERN int
nk_tt_GetGlyphBox(const struct nk_tt_fontinfo *info, int glyph_index,
    int *x0, int *y0, int *x1, int *y1)
{
    int g = nk_tt__GetGlyfOffset(info, glyph_index);
    if (g < 0) return 0;

    if (x0) *x0 = nk_ttSHORT(info->data + g + 2);
    if (y0) *y0 = nk_ttSHORT(info->data + g + 4);
    if (x1) *x1 = nk_ttSHORT(info->data + g + 6);
    if (y1) *y1 = nk_ttSHORT(info->data + g + 8);
    return 1;
}

NK_INTERN int
stbtt__close_shape(struct nk_tt_vertex *vertices, int num_vertices, int was_off,
    int start_off, nk_int sx, nk_int sy, nk_int scx, nk_int scy, nk_int cx, nk_int cy)
{
   if (start_off) {
      if (was_off)
         nk_tt_setvertex(&vertices[num_vertices++], NK_TT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
      nk_tt_setvertex(&vertices[num_vertices++], NK_TT_vcurve, sx,sy,scx,scy);
   } else {
      if (was_off)
         nk_tt_setvertex(&vertices[num_vertices++], NK_TT_vcurve,sx,sy,cx,cy);
      else
         nk_tt_setvertex(&vertices[num_vertices++], NK_TT_vline,sx,sy,0,0);
   }
   return num_vertices;
}

NK_INTERN int
nk_tt_GetGlyphShape(const struct nk_tt_fontinfo *info, struct nk_allocator *alloc,
    int glyph_index, struct nk_tt_vertex **pvertices)
{
    nk_short numberOfContours;
    const nk_byte *endPtsOfContours;
    const nk_byte *data = info->data;
    struct nk_tt_vertex *vertices=0;
    int num_vertices=0;
    int g = nk_tt__GetGlyfOffset(info, glyph_index);
    *pvertices = 0;

    if (g < 0) return 0;
    numberOfContours = nk_ttSHORT(data + g);
    if (numberOfContours > 0) {
        nk_byte flags=0,flagcount;
        nk_int ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
        nk_int x,y,cx,cy,sx,sy, scx,scy;
        const nk_byte *points;
        endPtsOfContours = (data + g + 10);
        ins = nk_ttUSHORT(data + g + 10 + numberOfContours * 2);
        points = data + g + 10 + numberOfContours * 2 + 2 + ins;

        n = 1+nk_ttUSHORT(endPtsOfContours + numberOfContours*2-2);
        m = n + 2*numberOfContours;  /* a loose bound on how many vertices we might need */
        vertices = (struct nk_tt_vertex *)alloc->alloc(alloc->userdata, 0, (nk_size)m * sizeof(vertices[0]));
        if (vertices == 0)
            return 0;

        next_move = 0;
        flagcount=0;

        /* in first pass, we load uninterpreted data into the allocated array */
        /* above, shifted to the end of the array so we won't overwrite it when */
        /* we create our final data starting from the front */
        off = m - n; /* starting offset for uninterpreted data, regardless of how m ends up being calculated */

        /* first load flags */
        for (i=0; i < n; ++i) {
            if (flagcount == 0) {
                flags = *points++;
                if (flags & 8)
                    flagcount = *points++;
            } else --flagcount;
            vertices[off+i].type = flags;
        }

        /* now load x coordinates */
        x=0;
        for (i=0; i < n; ++i) {
            flags = vertices[off+i].type;
            if (flags & 2) {
                nk_short dx = *points++;
                x += (flags & 16) ? dx : -dx; /* ??? */
            } else {
                if (!(flags & 16)) {
                    x = x + (nk_short) (points[0]*256 + points[1]);
                    points += 2;
                }
            }
            vertices[off+i].x = (nk_short) x;
        }

        /* now load y coordinates */
        y=0;
        for (i=0; i < n; ++i) {
            flags = vertices[off+i].type;
            if (flags & 4) {
                nk_short dy = *points++;
                y += (flags & 32) ? dy : -dy; /* ??? */
            } else {
                if (!(flags & 32)) {
                    y = y + (nk_short) (points[0]*256 + points[1]);
                    points += 2;
                }
            }
            vertices[off+i].y = (nk_short) y;
        }

        /* now convert them to our format */
        num_vertices=0;
        sx = sy = cx = cy = scx = scy = 0;
        for (i=0; i < n; ++i)
        {
            flags = vertices[off+i].type;
            x     = (nk_short) vertices[off+i].x;
            y     = (nk_short) vertices[off+i].y;

            if (next_move == i) {
                if (i != 0)
                    num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);

                /* now start the new one                */
                start_off = !(flags & 1);
                if (start_off) {
                    /* if we start off with an off-curve point, then when we need to find a point on the curve */
                    /* where we can start, and we need to save some state for when we wraparound. */
                    scx = x;
                    scy = y;
                    if (!(vertices[off+i+1].type & 1)) {
                        /* next point is also a curve point, so interpolate an on-point curve */
                        sx = (x + (nk_int) vertices[off+i+1].x) >> 1;
                        sy = (y + (nk_int) vertices[off+i+1].y) >> 1;
                    } else {
                        /* otherwise just use the next point as our start point */
                        sx = (nk_int) vertices[off+i+1].x;
                        sy = (nk_int) vertices[off+i+1].y;
                        ++i; /* we're using point i+1 as the starting point, so skip it */
                    }
                } else {
                    sx = x;
                    sy = y;
                }
                nk_tt_setvertex(&vertices[num_vertices++], NK_TT_vmove,sx,sy,0,0);
                was_off = 0;
                next_move = 1 + nk_ttUSHORT(endPtsOfContours+j*2);
                ++j;
            } else {
                if (!(flags & 1))
                { /* if it's a curve */
                    if (was_off) /* two off-curve control points in a row means interpolate an on-curve midpoint */
                        nk_tt_setvertex(&vertices[num_vertices++], NK_TT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
                    cx = x;
                    cy = y;
                    was_off = 1;
                } else {
                    if (was_off)
                        nk_tt_setvertex(&vertices[num_vertices++], NK_TT_vcurve, x,y, cx, cy);
                    else nk_tt_setvertex(&vertices[num_vertices++], NK_TT_vline, x,y,0,0);
                    was_off = 0;
                }
            }
        }
        num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
    } else if (numberOfContours == -1) {
        /* Compound shapes. */
        int more = 1;
        const nk_byte *comp = data + g + 10;
        num_vertices = 0;
        vertices = 0;

        while (more)
        {
            nk_ushort flags, gidx;
            int comp_num_verts = 0, i;
            struct nk_tt_vertex *comp_verts = 0, *tmp = 0;
            float mtx[6] = {1,0,0,1,0,0}, m, n;

            flags = (nk_ushort)nk_ttSHORT(comp); comp+=2;
            gidx = (nk_ushort)nk_ttSHORT(comp); comp+=2;

            if (flags & 2) { /* XY values */
                if (flags & 1) { /* shorts */
                    mtx[4] = nk_ttSHORT(comp); comp+=2;
                    mtx[5] = nk_ttSHORT(comp); comp+=2;
                } else {
                    mtx[4] = nk_ttCHAR(comp); comp+=1;
                    mtx[5] = nk_ttCHAR(comp); comp+=1;
                }
            } else {
                /* @TODO handle matching point */
                NK_ASSERT(0);
            }
            if (flags & (1<<3)) { /* WE_HAVE_A_SCALE */
                mtx[0] = mtx[3] = nk_ttSHORT(comp)/16384.0f; comp+=2;
                mtx[1] = mtx[2] = 0;
            } else if (flags & (1<<6)) { /* WE_HAVE_AN_X_AND_YSCALE */
                mtx[0] = nk_ttSHORT(comp)/16384.0f; comp+=2;
                mtx[1] = mtx[2] = 0;
                mtx[3] = nk_ttSHORT(comp)/16384.0f; comp+=2;
            } else if (flags & (1<<7)) { /* WE_HAVE_A_TWO_BY_TWO */
                mtx[0] = nk_ttSHORT(comp)/16384.0f; comp+=2;
                mtx[1] = nk_ttSHORT(comp)/16384.0f; comp+=2;
                mtx[2] = nk_ttSHORT(comp)/16384.0f; comp+=2;
                mtx[3] = nk_ttSHORT(comp)/16384.0f; comp+=2;
            }

             /* Find transformation scales. */
            m = (float) NK_SQRT(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
            n = (float) NK_SQRT(mtx[2]*mtx[2] + mtx[3]*mtx[3]);

             /* Get indexed glyph. */
            comp_num_verts = nk_tt_GetGlyphShape(info, alloc, gidx, &comp_verts);
            if (comp_num_verts > 0)
            {
                /* Transform vertices. */
                for (i = 0; i < comp_num_verts; ++i) {
                    struct nk_tt_vertex* v = &comp_verts[i];
                    short x,y;
                    x=v->x; y=v->y;
                    v->x = (short)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
                    v->y = (short)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
                    x=v->cx; y=v->cy;
                    v->cx = (short)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
                    v->cy = (short)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
                }
                /* Append vertices. */
                tmp = (struct nk_tt_vertex*)alloc->alloc(alloc->userdata, 0,
                    (nk_size)(num_vertices+comp_num_verts)*sizeof(struct nk_tt_vertex));
                if (!tmp) {
                    if (vertices) alloc->free(alloc->userdata, vertices);
                    if (comp_verts) alloc->free(alloc->userdata, comp_verts);
                    return 0;
                }
                if (num_vertices > 0) NK_MEMCPY(tmp, vertices, (nk_size)num_vertices*sizeof(struct nk_tt_vertex));
                NK_MEMCPY(tmp+num_vertices, comp_verts, (nk_size)comp_num_verts*sizeof(struct nk_tt_vertex));
                if (vertices) alloc->free(alloc->userdata,vertices);
                vertices = tmp;
                alloc->free(alloc->userdata,comp_verts);
                num_vertices += comp_num_verts;
            }
            /* More components ? */
            more = flags & (1<<5);
        }
    } else if (numberOfContours < 0) {
        /* @TODO other compound variations? */
        NK_ASSERT(0);
    } else {
        /* numberOfCounters == 0, do nothing */
    }
    *pvertices = vertices;
    return num_vertices;
}

NK_INTERN void
nk_tt_GetGlyphHMetrics(const struct nk_tt_fontinfo *info, int glyph_index,
    int *advanceWidth, int *leftSideBearing)
{
    nk_ushort numOfLongHorMetrics = nk_ttUSHORT(info->data+info->hhea + 34);
    if (glyph_index < numOfLongHorMetrics) {
        if (advanceWidth)
            *advanceWidth    = nk_ttSHORT(info->data + info->hmtx + 4*glyph_index);
        if (leftSideBearing)
            *leftSideBearing = nk_ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
    } else {
        if (advanceWidth)
            *advanceWidth    = nk_ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
        if (leftSideBearing)
            *leftSideBearing = nk_ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
    }
}

NK_INTERN void
nk_tt_GetFontVMetrics(const struct nk_tt_fontinfo *info,
    int *ascent, int *descent, int *lineGap)
{
   if (ascent ) *ascent  = nk_ttSHORT(info->data+info->hhea + 4);
   if (descent) *descent = nk_ttSHORT(info->data+info->hhea + 6);
   if (lineGap) *lineGap = nk_ttSHORT(info->data+info->hhea + 8);
}

NK_INTERN float
nk_tt_ScaleForPixelHeight(const struct nk_tt_fontinfo *info, float height)
{
   int fheight = nk_ttSHORT(info->data + info->hhea + 4) - nk_ttSHORT(info->data + info->hhea + 6);
   return (float) height / (float)fheight;
}

NK_INTERN float
nk_tt_ScaleForMappingEmToPixels(const struct nk_tt_fontinfo *info, float pixels)
{
   int unitsPerEm = nk_ttUSHORT(info->data + info->head + 18);
   return pixels / (float)unitsPerEm;
}

/*-------------------------------------------------------------
 *            antialiasing software rasterizer
 * --------------------------------------------------------------*/
NK_INTERN void
nk_tt_GetGlyphBitmapBoxSubpixel(const struct nk_tt_fontinfo *font,
    int glyph, float scale_x, float scale_y,float shift_x, float shift_y,
    int *ix0, int *iy0, int *ix1, int *iy1)
{
    int x0,y0,x1,y1;
    if (!nk_tt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
        /* e.g. space character */
        if (ix0) *ix0 = 0;
        if (iy0) *iy0 = 0;
        if (ix1) *ix1 = 0;
        if (iy1) *iy1 = 0;
    } else {
        /* move to integral bboxes (treating pixels as little squares, what pixels get touched)? */
        if (ix0) *ix0 = nk_ifloorf((float)x0 * scale_x + shift_x);
        if (iy0) *iy0 = nk_ifloorf((float)-y1 * scale_y + shift_y);
        if (ix1) *ix1 = nk_iceilf ((float)x1 * scale_x + shift_x);
        if (iy1) *iy1 = nk_iceilf ((float)-y0 * scale_y + shift_y);
    }
}

NK_INTERN void
nk_tt_GetGlyphBitmapBox(const struct nk_tt_fontinfo *font, int glyph,
    float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
{
   nk_tt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
}

/*-------------------------------------------------------------
 *                          Rasterizer
 * --------------------------------------------------------------*/
NK_INTERN void*
nk_tt__hheap_alloc(struct nk_tt__hheap *hh, nk_size size)
{
    if (hh->first_free) {
        void *p = hh->first_free;
        hh->first_free = * (void **) p;
        return p;
    } else {
        if (hh->num_remaining_in_head_chunk == 0) {
            int count = (size < 32 ? 2000 : size < 128 ? 800 : 100);
            struct nk_tt__hheap_chunk *c = (struct nk_tt__hheap_chunk *)
                hh->alloc.alloc(hh->alloc.userdata, 0,
                sizeof(struct nk_tt__hheap_chunk) + size * (nk_size)count);
            if (c == 0) return 0;
            c->next = hh->head;
            hh->head = c;
            hh->num_remaining_in_head_chunk = count;
        }
        --hh->num_remaining_in_head_chunk;
        return (char *) (hh->head) + size * (nk_size)hh->num_remaining_in_head_chunk;
    }
}

NK_INTERN void
nk_tt__hheap_free(struct nk_tt__hheap *hh, void *p)
{
    *(void **) p = hh->first_free;
    hh->first_free = p;
}

NK_INTERN void
nk_tt__hheap_cleanup(struct nk_tt__hheap *hh)
{
    struct nk_tt__hheap_chunk *c = hh->head;
    while (c) {
        struct nk_tt__hheap_chunk *n = c->next;
        hh->alloc.free(hh->alloc.userdata, c);
        c = n;
    }
}

NK_INTERN struct nk_tt__active_edge*
nk_tt__new_active(struct nk_tt__hheap *hh, struct nk_tt__edge *e,
    int off_x, float start_point)
{
    struct nk_tt__active_edge *z = (struct nk_tt__active_edge *)
        nk_tt__hheap_alloc(hh, sizeof(*z));
    float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
    /*STBTT_assert(e->y0 <= start_point); */
    if (!z) return z;
    z->fdx = dxdy;
    z->fdy = (dxdy != 0) ? (1/dxdy): 0;
    z->fx = e->x0 + dxdy * (start_point - e->y0);
    z->fx -= (float)off_x;
    z->direction = e->invert ? 1.0f : -1.0f;
    z->sy = e->y0;
    z->ey = e->y1;
    z->next = 0;
    return z;
}

NK_INTERN void
nk_tt__handle_clipped_edge(float *scanline, int x, struct nk_tt__active_edge *e,
    float x0, float y0, float x1, float y1)
{
    if (y0 == y1) return;
    NK_ASSERT(y0 < y1);
    NK_ASSERT(e->sy <= e->ey);
    if (y0 > e->ey) return;
    if (y1 < e->sy) return;
    if (y0 < e->sy) {
        x0 += (x1-x0) * (e->sy - y0) / (y1-y0);
        y0 = e->sy;
    }
    if (y1 > e->ey) {
        x1 += (x1-x0) * (e->ey - y1) / (y1-y0);
        y1 = e->ey;
    }

    if (x0 == x) NK_ASSERT(x1 <= x+1);
    else if (x0 == x+1) NK_ASSERT(x1 >= x);
    else if (x0 <= x) NK_ASSERT(x1 <= x);
    else if (x0 >= x+1) NK_ASSERT(x1 >= x+1);
    else NK_ASSERT(x1 >= x && x1 <= x+1);

    if (x0 <= x && x1 <= x)
        scanline[x] += e->direction * (y1-y0);
    else if (x0 >= x+1 && x1 >= x+1);
    else {
        NK_ASSERT(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1);
        /* coverage = 1 - average x position */
        scanline[x] += (float)e->direction * (float)(y1-y0) * (1.0f-((x0-(float)x)+(x1-(float)x))/2.0f);
    }
}

NK_INTERN void
nk_tt__fill_active_edges_new(float *scanline, float *scanline_fill, int len,
    struct nk_tt__active_edge *e, float y_top)
{
    float y_bottom = y_top+1;
    while (e)
    {
        /* brute force every pixel */
        /* compute intersection points with top & bottom */
        NK_ASSERT(e->ey >= y_top);
        if (e->fdx == 0) {
            float x0 = e->fx;
            if (x0 < len) {
                if (x0 >= 0) {
                    nk_tt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom);
                    nk_tt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom);
                } else {
                    nk_tt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom);
                }
            }
        } else {
            float x0 = e->fx;
            float dx = e->fdx;
            float xb = x0 + dx;
            float x_top, x_bottom;
            float y0,y1;
            float dy = e->fdy;
            NK_ASSERT(e->sy <= y_bottom && e->ey >= y_top);

            /* compute endpoints of line segment clipped to this scanline (if the */
            /* line segment starts on this scanline. x0 is the intersection of the */
            /* line with y_top, but that may be off the line segment. */
            if (e->sy > y_top) {
                x_top = x0 + dx * (e->sy - y_top);
                y0 = e->sy;
            } else {
                x_top = x0;
                y0 = y_top;
            }

            if (e->ey < y_bottom) {
                x_bottom = x0 + dx * (e->ey - y_top);
                y1 = e->ey;
            } else {
                x_bottom = xb;
                y1 = y_bottom;
            }

            if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len)
            {
                /* from here on, we don't have to range check x values */
                if ((int) x_top == (int) x_bottom) {
                    float height;
                    /* simple case, only spans one pixel */
                    int x = (int) x_top;
                    height = y1 - y0;
                    NK_ASSERT(x >= 0 && x < len);
                    scanline[x] += e->direction * (1.0f-(((float)x_top - (float)x) + ((float)x_bottom-(float)x))/2.0f)  * (float)height;
                    scanline_fill[x] += e->direction * (float)height; /* everything right of this pixel is filled */
                } else {
                    int x,x1,x2;
                    float y_crossing, step, sign, area;
                    /* covers 2+ pixels */
                    if (x_top > x_bottom)
                    {
                        /* flip scanline vertically; signed area is the same */
                        float t;
                        y0 = y_bottom - (y0 - y_top);
                        y1 = y_bottom - (y1 - y_top);
                        t = y0; y0 = y1; y1 = t;
                        t = x_bottom; x_bottom = x_top; x_top = t;
                        dx = -dx;
                        dy = -dy;
                        t = x0; x0 = xb; xb = t;
                    }

                    x1 = (int) x_top;
                    x2 = (int) x_bottom;
                    /* compute intersection with y axis at x1+1 */
                    y_crossing = ((float)x1+1 - (float)x0) * (float)dy + (float)y_top;

                    sign = e->direction;
                    /* area of the rectangle covered from y0..y_crossing */
                    area = sign * (y_crossing-y0);
                    /* area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing) */
                    scanline[x1] += area * (1.0f-((float)((float)x_top - (float)x1)+(float)(x1+1-x1))/2.0f);

                    step = sign * dy;
                    for (x = x1+1; x < x2; ++x) {
                        scanline[x] += area + step/2;
                        area += step;
                    }
                    y_crossing += (float)dy * (float)(x2 - (x1+1));

                    scanline[x2] += area + sign * (1.0f-((float)(x2-x2)+((float)x_bottom-(float)x2))/2.0f) * (y1-y_crossing);
                    scanline_fill[x2] += sign * (y1-y0);
                }
            }
            else
            {
                /* if edge goes outside of box we're drawing, we require */
                /* clipping logic. since this does not match the intended use */
                /* of this library, we use a different, very slow brute */
                /* force implementation */
                int x;
                for (x=0; x < len; ++x)
                {
                    /* cases: */
                    /* */
                    /* there can be up to two intersections with the pixel. any intersection */
                    /* with left or right edges can be handled by splitting into two (or three) */
                    /* regions. intersections with top & bottom do not necessitate case-wise logic. */
                    /* */
                    /* the old way of doing this found the intersections with the left & right edges, */
                    /* then used some simple logic to produce up to three segments in sorted order */
                    /* from top-to-bottom. however, this had a problem: if an x edge was epsilon */
                    /* across the x border, then the corresponding y position might not be distinct */
                    /* from the other y segment, and it might ignored as an empty segment. to avoid */
                    /* that, we need to explicitly produce segments based on x positions. */

                    /* rename variables to clear pairs */
                    float ya = y_top;
                    float x1 = (float) (x);
                    float x2 = (float) (x+1);
                    float x3 = xb;
                    float y3 = y_bottom;
                    float yb,y2;

                    yb = ((float)x - x0) / dx + y_top;
                    y2 = ((float)x+1 - x0) / dx + y_top;

                    if (x0 < x1 && x3 > x2) {         /* three segments descending down-right */
                        nk_tt__handle_clipped_edge(scanline,x,e, x0,ya, x1,yb);
                        nk_tt__handle_clipped_edge(scanline,x,e, x1,yb, x2,y2);
                        nk_tt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
                    } else if (x3 < x1 && x0 > x2) {  /* three segments descending down-left */
                        nk_tt__handle_clipped_edge(scanline,x,e, x0,ya, x2,y2);
                        nk_tt__handle_clipped_edge(scanline,x,e, x2,y2, x1,yb);
                        nk_tt__handle_clipped_edge(scanline,x,e, x1,yb, x3,y3);
                    } else if (x0 < x1 && x3 > x1) {  /* two segments across x, down-right */
                        nk_tt__handle_clipped_edge(scanline,x,e, x0,ya, x1,yb);
                        nk_tt__handle_clipped_edge(scanline,x,e, x1,yb, x3,y3);
                    } else if (x3 < x1 && x0 > x1) {  /* two segments across x, down-left */
                        nk_tt__handle_clipped_edge(scanline,x,e, x0,ya, x1,yb);
                        nk_tt__handle_clipped_edge(scanline,x,e, x1,yb, x3,y3);
                    } else if (x0 < x2 && x3 > x2) {  /* two segments across x+1, down-right */
                        nk_tt__handle_clipped_edge(scanline,x,e, x0,ya, x2,y2);
                        nk_tt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
                    } else if (x3 < x2 && x0 > x2) {  /* two segments across x+1, down-left */
                        nk_tt__handle_clipped_edge(scanline,x,e, x0,ya, x2,y2);
                        nk_tt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
                    } else {  /* one segment */
                        nk_tt__handle_clipped_edge(scanline,x,e, x0,ya, x3,y3);
                    }
                }
            }
        }
        e = e->next;
    }
}

/* directly AA rasterize edges w/o supersampling */
NK_INTERN void
nk_tt__rasterize_sorted_edges(struct nk_tt__bitmap *result, struct nk_tt__edge *e,
    int n, int vsubsample, int off_x, int off_y, struct nk_allocator *alloc)
{
    struct nk_tt__hheap hh;
    struct nk_tt__active_edge *active = 0;
    int y,j=0, i;
    float scanline_data[129], *scanline, *scanline2;

    NK_UNUSED(vsubsample);
    nk_zero_struct(hh);
    hh.alloc = *alloc;

    if (result->w > 64)
        scanline = (float *) alloc->alloc(alloc->userdata,0, (nk_size)(result->w*2+1) * sizeof(float));
    else scanline = scanline_data;

    scanline2 = scanline + result->w;
    y = off_y;
    e[n].y0 = (float) (off_y + result->h) + 1;

    while (j < result->h)
    {
        /* find center of pixel for this scanline */
        float scan_y_top    = (float)y + 0.0f;
        float scan_y_bottom = (float)y + 1.0f;
        struct nk_tt__active_edge **step = &active;

        NK_MEMSET(scanline , 0, (nk_size)result->w*sizeof(scanline[0]));
        NK_MEMSET(scanline2, 0, (nk_size)(result->w+1)*sizeof(scanline[0]));

        /* update all active edges; */
        /* remove all active edges that terminate before the top of this scanline */
        while (*step) {
            struct nk_tt__active_edge * z = *step;
            if (z->ey <= scan_y_top) {
                *step = z->next; /* delete from list */
                NK_ASSERT(z->direction);
                z->direction = 0;
                nk_tt__hheap_free(&hh, z);
            } else {
                step = &((*step)->next); /* advance through list */
            }
        }

        /* insert all edges that start before the bottom of this scanline */
        while (e->y0 <= scan_y_bottom) {
            if (e->y0 != e->y1) {
                struct nk_tt__active_edge *z = nk_tt__new_active(&hh, e, off_x, scan_y_top);
                if (z != 0) {
                    NK_ASSERT(z->ey >= scan_y_top);
                    /* insert at front */
                    z->next = active;
                    active = z;
                }
            }
            ++e;
        }

        /* now process all active edges */
        if (active)
            nk_tt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top);

        {
            float sum = 0;
            for (i=0; i < result->w; ++i) {
                float k;
                int m;
                sum += scanline2[i];
                k = scanline[i] + sum;
                k = (float) NK_ABS(k) * 255.0f + 0.5f;
                m = (int) k;
                if (m > 255) m = 255;
                result->pixels[j*result->stride + i] = (unsigned char) m;
            }
        }
        /* advance all the edges */
        step = &active;
        while (*step) {
            struct nk_tt__active_edge *z = *step;
            z->fx += z->fdx; /* advance to position for current scanline */
            step = &((*step)->next); /* advance through list */
        }
        ++y;
        ++j;
    }
    nk_tt__hheap_cleanup(&hh);
    if (scanline != scanline_data)
        alloc->free(alloc->userdata, scanline);
}

#define NK_TT__COMPARE(a,b)  ((a)->y0 < (b)->y0)
NK_INTERN void
nk_tt__sort_edges_ins_sort(struct nk_tt__edge *p, int n)
{
    int i,j;
    for (i=1; i < n; ++i) {
        struct nk_tt__edge t = p[i], *a = &t;
        j = i;
        while (j > 0) {
            struct nk_tt__edge *b = &p[j-1];
            int c = NK_TT__COMPARE(a,b);
            if (!c) break;
            p[j] = p[j-1];
            --j;
        }
        if (i != j)
            p[j] = t;
    }
}

NK_INTERN void
nk_tt__sort_edges_quicksort(struct nk_tt__edge *p, int n)
{
    /* threshold for transitioning to insertion sort */
    while (n > 12) {
        struct nk_tt__edge t;
        int c01,c12,c,m,i,j;

        /* compute median of three */
        m = n >> 1;
        c01 = NK_TT__COMPARE(&p[0],&p[m]);
        c12 = NK_TT__COMPARE(&p[m],&p[n-1]);

        /* if 0 >= mid >= end, or 0 < mid < end, then use mid */
        if (c01 != c12) {
            /* otherwise, we'll need to swap something else to middle */
            int z;
            c = NK_TT__COMPARE(&p[0],&p[n-1]);
            /* 0>mid && mid<n:  0>n => n; 0<n => 0 */
            /* 0<mid && mid>n:  0>n => 0; 0<n => n */
            z = (c == c12) ? 0 : n-1;
            t = p[z];
            p[z] = p[m];
            p[m] = t;
        }

        /* now p[m] is the median-of-three */
        /* swap it to the beginning so it won't move around */
        t = p[0];
        p[0] = p[m];
        p[m] = t;

        /* partition loop */
        i=1;
        j=n-1;
        for(;;) {
            /* handling of equality is crucial here */
            /* for sentinels & efficiency with duplicates */
            for (;;++i) {
                if (!NK_TT__COMPARE(&p[i], &p[0])) break;
            }
            for (;;--j) {
                if (!NK_TT__COMPARE(&p[0], &p[j])) break;
            }

            /* make sure we haven't crossed */
             if (i >= j) break;
             t = p[i];
             p[i] = p[j];
             p[j] = t;

            ++i;
            --j;

        }

        /* recurse on smaller side, iterate on larger */
        if (j < (n-i)) {
            nk_tt__sort_edges_quicksort(p,j);
            p = p+i;
            n = n-i;
        } else {
            nk_tt__sort_edges_quicksort(p+i, n-i);
            n = j;
        }
    }
}

NK_INTERN void
nk_tt__sort_edges(struct nk_tt__edge *p, int n)
{
   nk_tt__sort_edges_quicksort(p, n);
   nk_tt__sort_edges_ins_sort(p, n);
}

NK_INTERN void
nk_tt__rasterize(struct nk_tt__bitmap *result, struct nk_tt__point *pts,
    int *wcount, int windings, float scale_x, float scale_y,
    float shift_x, float shift_y, int off_x, int off_y, int invert,
    struct nk_allocator *alloc)
{
    float y_scale_inv = invert ? -scale_y : scale_y;
    struct nk_tt__edge *e;
    int n,i,j,k,m;
    int vsubsample = 1;
    /* vsubsample should divide 255 evenly; otherwise we won't reach full opacity */

    /* now we have to blow out the windings into explicit edge lists */
    n = 0;
    for (i=0; i < windings; ++i)
        n += wcount[i];

    e = (struct nk_tt__edge*)
       alloc->alloc(alloc->userdata, 0,(sizeof(*e) * (nk_size)(n+1)));
    if (e == 0) return;
    n = 0;

    m=0;
    for (i=0; i < windings; ++i)
    {
        struct nk_tt__point *p = pts + m;
        m += wcount[i];
        j = wcount[i]-1;
        for (k=0; k < wcount[i]; j=k++) {
            int a=k,b=j;
            /* skip the edge if horizontal */
            if (p[j].y == p[k].y)
                continue;

            /* add edge from j to k to the list */
            e[n].invert = 0;
            if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
                e[n].invert = 1;
                a=j,b=k;
            }
            e[n].x0 = p[a].x * scale_x + shift_x;
            e[n].y0 = (p[a].y * y_scale_inv + shift_y) * (float)vsubsample;
            e[n].x1 = p[b].x * scale_x + shift_x;
            e[n].y1 = (p[b].y * y_scale_inv + shift_y) * (float)vsubsample;
            ++n;
        }
    }

    /* now sort the edges by their highest point (should snap to integer, and then by x) */
    /*STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare); */
    nk_tt__sort_edges(e, n);
    /* now, traverse the scanlines and find the intersections on each scanline, use xor winding rule */
    nk_tt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, alloc);
    alloc->free(alloc->userdata, e);
}

NK_INTERN void
nk_tt__add_point(struct nk_tt__point *points, int n, float x, float y)
{
    if (!points) return; /* during first pass, it's unallocated */
    points[n].x = x;
    points[n].y = y;
}

NK_INTERN int
nk_tt__tesselate_curve(struct nk_tt__point *points, int *num_points,
    float x0, float y0, float x1, float y1, float x2, float y2,
    float objspace_flatness_squared, int n)
{
    /* tesselate until threshold p is happy...
     * @TODO warped to compensate for non-linear stretching */
    /* midpoint */
    float mx = (x0 + 2*x1 + x2)/4;
    float my = (y0 + 2*y1 + y2)/4;
    /* versus directly drawn line */
    float dx = (x0+x2)/2 - mx;
    float dy = (y0+y2)/2 - my;
    if (n > 16) /* 65536 segments on one curve better be enough! */
        return 1;

    /* half-pixel error allowed... need to be smaller if AA */
    if (dx*dx+dy*dy > objspace_flatness_squared) {
        nk_tt__tesselate_curve(points, num_points, x0,y0,
            (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
        nk_tt__tesselate_curve(points, num_points, mx,my,
            (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
    } else {
        nk_tt__add_point(points, *num_points,x2,y2);
        *num_points = *num_points+1;
    }
    return 1;
}

/* returns number of contours */
NK_INTERN struct nk_tt__point*
nk_tt_FlattenCurves(struct nk_tt_vertex *vertices, int num_verts,
    float objspace_flatness, int **contour_lengths, int *num_contours,
    struct nk_allocator *alloc)
{
    struct nk_tt__point *points=0;
    int num_points=0;
    float objspace_flatness_squared = objspace_flatness * objspace_flatness;
    int i;
    int n=0;
    int start=0;
    int pass;

    /* count how many "moves" there are to get the contour count */
    for (i=0; i < num_verts; ++i)
        if (vertices[i].type == NK_TT_vmove) ++n;

    *num_contours = n;
    if (n == 0) return 0;

    *contour_lengths = (int *)
        alloc->alloc(alloc->userdata,0, (sizeof(**contour_lengths) * (nk_size)n));
    if (*contour_lengths == 0) {
        *num_contours = 0;
        return 0;
    }

    /* make two passes through the points so we don't need to realloc */
    for (pass=0; pass < 2; ++pass)
    {
        float x=0,y=0;
        if (pass == 1) {
            points = (struct nk_tt__point *)
                alloc->alloc(alloc->userdata,0, (nk_size)num_points * sizeof(points[0]));
            if (points == 0) goto error;
        }
        num_points = 0;
        n= -1;

        for (i=0; i < num_verts; ++i)
        {
            switch (vertices[i].type) {
            case NK_TT_vmove:
                /* start the next contour */
                if (n >= 0)
                (*contour_lengths)[n] = num_points - start;
                ++n;
                start = num_points;

                x = vertices[i].x, y = vertices[i].y;
                nk_tt__add_point(points, num_points++, x,y);
                break;
            case NK_TT_vline:
               x = vertices[i].x, y = vertices[i].y;
               nk_tt__add_point(points, num_points++, x, y);
               break;
            case NK_TT_vcurve:
               nk_tt__tesselate_curve(points, &num_points, x,y,
                                        vertices[i].cx, vertices[i].cy,
                                        vertices[i].x,  vertices[i].y,
                                        objspace_flatness_squared, 0);
               x = vertices[i].x, y = vertices[i].y;
               break;
            default: break;
         }
      }
      (*contour_lengths)[n] = num_points - start;
   }
   return points;

error:
   alloc->free(alloc->userdata, points);
   alloc->free(alloc->userdata, *contour_lengths);
   *contour_lengths = 0;
   *num_contours = 0;
   return 0;
}

NK_INTERN void
nk_tt_Rasterize(struct nk_tt__bitmap *result, float flatness_in_pixels,
    struct nk_tt_vertex *vertices, int num_verts,
    float scale_x, float scale_y, float shift_x, float shift_y,
    int x_off, int y_off, int invert, struct nk_allocator *alloc)
{
    float scale = scale_x > scale_y ? scale_y : scale_x;
    int winding_count, *winding_lengths;
    struct nk_tt__point *windings = nk_tt_FlattenCurves(vertices, num_verts,
        flatness_in_pixels / scale, &winding_lengths, &winding_count, alloc);

    NK_ASSERT(alloc);
    if (windings) {
        nk_tt__rasterize(result, windings, winding_lengths, winding_count,
            scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, alloc);
        alloc->free(alloc->userdata, winding_lengths);
        alloc->free(alloc->userdata, windings);
    }
}

NK_INTERN void
nk_tt_MakeGlyphBitmapSubpixel(const struct nk_tt_fontinfo *info, unsigned char *output,
    int out_w, int out_h, int out_stride, float scale_x, float scale_y,
    float shift_x, float shift_y, int glyph, struct nk_allocator *alloc)
{
    int ix0,iy0;
    struct nk_tt_vertex *vertices;
    int num_verts = nk_tt_GetGlyphShape(info, alloc, glyph, &vertices);
    struct nk_tt__bitmap gbm;

    nk_tt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x,
        shift_y, &ix0,&iy0,0,0);
    gbm.pixels = output;
    gbm.w = out_w;
    gbm.h = out_h;
    gbm.stride = out_stride;

    if (gbm.w && gbm.h)
        nk_tt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y,
            shift_x, shift_y, ix0,iy0, 1, alloc);
    alloc->free(alloc->userdata, vertices);
}

/*-------------------------------------------------------------
 *                          Bitmap baking
 * --------------------------------------------------------------*/
NK_INTERN int
nk_tt_PackBegin(struct nk_tt_pack_context *spc, unsigned char *pixels,
    int pw, int ph, int stride_in_bytes, int padding, struct nk_allocator *alloc)
{
    int num_nodes = pw - padding;
    struct nk_rp_context *context = (struct nk_rp_context *)
        alloc->alloc(alloc->userdata,0, sizeof(*context));
    struct nk_rp_node *nodes = (struct nk_rp_node*)
        alloc->alloc(alloc->userdata,0, (sizeof(*nodes  ) * (nk_size)num_nodes));

    if (context == 0 || nodes == 0) {
        if (context != 0) alloc->free(alloc->userdata, context);
        if (nodes   != 0) alloc->free(alloc->userdata, nodes);
        return 0;
    }

    spc->width = pw;
    spc->height = ph;
    spc->pixels = pixels;
    spc->pack_info = context;
    spc->nodes = nodes;
    spc->padding = padding;
    spc->stride_in_bytes = (stride_in_bytes != 0) ? stride_in_bytes : pw;
    spc->h_oversample = 1;
    spc->v_oversample = 1;

    nk_rp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
    if (pixels)
        NK_MEMSET(pixels, 0, (nk_size)(pw*ph)); /* background of 0 around pixels */
    return 1;
}

NK_INTERN void
nk_tt_PackEnd(struct nk_tt_pack_context *spc, struct nk_allocator *alloc)
{
    alloc->free(alloc->userdata, spc->nodes);
    alloc->free(alloc->userdata, spc->pack_info);
}

NK_INTERN void
nk_tt_PackSetOversampling(struct nk_tt_pack_context *spc,
    unsigned int h_oversample, unsigned int v_oversample)
{
   NK_ASSERT(h_oversample <= NK_TT_MAX_OVERSAMPLE);
   NK_ASSERT(v_oversample <= NK_TT_MAX_OVERSAMPLE);
   if (h_oversample <= NK_TT_MAX_OVERSAMPLE)
      spc->h_oversample = h_oversample;
   if (v_oversample <= NK_TT_MAX_OVERSAMPLE)
      spc->v_oversample = v_oversample;
}

NK_INTERN void
nk_tt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes,
    int kernel_width)
{
    unsigned char buffer[NK_TT_MAX_OVERSAMPLE];
    int safe_w = w - kernel_width;
    int j;

    for (j=0; j < h; ++j)
    {
        int i;
        unsigned int total;
        NK_MEMSET(buffer, 0, (nk_size)kernel_width);

        total = 0;

        /* make kernel_width a constant in common cases so compiler can optimize out the divide */
        switch (kernel_width) {
        case 2:
            for (i=0; i <= safe_w; ++i) {
                total += (unsigned int)(pixels[i] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i];
                pixels[i] = (unsigned char) (total / 2);
            }
            break;
        case 3:
            for (i=0; i <= safe_w; ++i) {
                total += (unsigned int)(pixels[i] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i];
                pixels[i] = (unsigned char) (total / 3);
            }
            break;
        case 4:
            for (i=0; i <= safe_w; ++i) {
                total += (unsigned int)pixels[i] - buffer[i & NK_TT__OVER_MASK];
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i];
                pixels[i] = (unsigned char) (total / 4);
            }
            break;
        case 5:
            for (i=0; i <= safe_w; ++i) {
                total += (unsigned int)(pixels[i] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i];
                pixels[i] = (unsigned char) (total / 5);
            }
            break;
        default:
            for (i=0; i <= safe_w; ++i) {
                total += (unsigned int)(pixels[i] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i];
                pixels[i] = (unsigned char) (total / (unsigned int)kernel_width);
            }
            break;
        }

        for (; i < w; ++i) {
            NK_ASSERT(pixels[i] == 0);
            total -= (unsigned int)(buffer[i & NK_TT__OVER_MASK]);
            pixels[i] = (unsigned char) (total / (unsigned int)kernel_width);
        }
        pixels += stride_in_bytes;
    }
}

NK_INTERN void
nk_tt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes,
    int kernel_width)
{
    unsigned char buffer[NK_TT_MAX_OVERSAMPLE];
    int safe_h = h - kernel_width;
    int j;

    for (j=0; j < w; ++j)
    {
        int i;
        unsigned int total;
        NK_MEMSET(buffer, 0, (nk_size)kernel_width);

        total = 0;

        /* make kernel_width a constant in common cases so compiler can optimize out the divide */
        switch (kernel_width) {
        case 2:
            for (i=0; i <= safe_h; ++i) {
                total += (unsigned int)(pixels[i*stride_in_bytes] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i*stride_in_bytes];
                pixels[i*stride_in_bytes] = (unsigned char) (total / 2);
            }
            break;
         case 3:
            for (i=0; i <= safe_h; ++i) {
                total += (unsigned int)(pixels[i*stride_in_bytes] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i*stride_in_bytes];
                pixels[i*stride_in_bytes] = (unsigned char) (total / 3);
            }
            break;
         case 4:
            for (i=0; i <= safe_h; ++i) {
                total += (unsigned int)(pixels[i*stride_in_bytes] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i*stride_in_bytes];
                pixels[i*stride_in_bytes] = (unsigned char) (total / 4);
            }
            break;
         case 5:
            for (i=0; i <= safe_h; ++i) {
                total += (unsigned int)(pixels[i*stride_in_bytes] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i*stride_in_bytes];
                pixels[i*stride_in_bytes] = (unsigned char) (total / 5);
            }
            break;
         default:
            for (i=0; i <= safe_h; ++i) {
                total += (unsigned int)(pixels[i*stride_in_bytes] - buffer[i & NK_TT__OVER_MASK]);
                buffer[(i+kernel_width) & NK_TT__OVER_MASK] = pixels[i*stride_in_bytes];
                pixels[i*stride_in_bytes] = (unsigned char) (total / (unsigned int)kernel_width);
            }
            break;
        }

        for (; i < h; ++i) {
            NK_ASSERT(pixels[i*stride_in_bytes] == 0);
            total -= (unsigned int)(buffer[i & NK_TT__OVER_MASK]);
            pixels[i*stride_in_bytes] = (unsigned char) (total / (unsigned int)kernel_width);
        }
        pixels += 1;
    }
}

NK_INTERN float
nk_tt__oversample_shift(int oversample)
{
    if (!oversample)
        return 0.0f;

    /* The prefilter is a box filter of width "oversample", */
    /* which shifts phase by (oversample - 1)/2 pixels in */
    /* oversampled space. We want to shift in the opposite */
    /* direction to counter this. */
    return (float)-(oversample - 1) / (2.0f * (float)oversample);
}

/* rects array must be big enough to accommodate all characters in the given ranges */
NK_INTERN int
nk_tt_PackFontRangesGatherRects(struct nk_tt_pack_context *spc,
    struct nk_tt_fontinfo *info, struct nk_tt_pack_range *ranges,
    int num_ranges, struct nk_rp_rect *rects)
{
    int i,j,k;
    k = 0;

    for (i=0; i < num_ranges; ++i) {
        float fh = ranges[i].font_size;
        float scale = (fh > 0) ? nk_tt_ScaleForPixelHeight(info, fh):
            nk_tt_ScaleForMappingEmToPixels(info, -fh);
        ranges[i].h_oversample = (unsigned char) spc->h_oversample;
        ranges[i].v_oversample = (unsigned char) spc->v_oversample;
        for (j=0; j < ranges[i].num_chars; ++j) {
            int x0,y0,x1,y1;
            int codepoint = ranges[i].first_unicode_codepoint_in_range ?
                ranges[i].first_unicode_codepoint_in_range + j :
                ranges[i].array_of_unicode_codepoints[j];

            int glyph = nk_tt_FindGlyphIndex(info, codepoint);
            nk_tt_GetGlyphBitmapBoxSubpixel(info,glyph, scale * (float)spc->h_oversample,
                scale * (float)spc->v_oversample, 0,0, &x0,&y0,&x1,&y1);
            rects[k].w = (nk_rp_coord) (x1-x0 + spc->padding + (int)spc->h_oversample-1);
            rects[k].h = (nk_rp_coord) (y1-y0 + spc->padding + (int)spc->v_oversample-1);
            ++k;
        }
    }
    return k;
}

NK_INTERN int
nk_tt_PackFontRangesRenderIntoRects(struct nk_tt_pack_context *spc,
    struct nk_tt_fontinfo *info, struct nk_tt_pack_range *ranges,
    int num_ranges, struct nk_rp_rect *rects, struct nk_allocator *alloc)
{
    int i,j,k, return_value = 1;
    /* save current values */
    int old_h_over = (int)spc->h_oversample;
    int old_v_over = (int)spc->v_oversample;
    /* rects array must be big enough to accommodate all characters in the given ranges */

    k = 0;
    for (i=0; i < num_ranges; ++i)
    {
        float fh = ranges[i].font_size;
        float recip_h,recip_v,sub_x,sub_y;
        float scale = fh > 0 ? nk_tt_ScaleForPixelHeight(info, fh):
            nk_tt_ScaleForMappingEmToPixels(info, -fh);

        spc->h_oversample = ranges[i].h_oversample;
        spc->v_oversample = ranges[i].v_oversample;

        recip_h = 1.0f / (float)spc->h_oversample;
        recip_v = 1.0f / (float)spc->v_oversample;

        sub_x = nk_tt__oversample_shift((int)spc->h_oversample);
        sub_y = nk_tt__oversample_shift((int)spc->v_oversample);

        for (j=0; j < ranges[i].num_chars; ++j)
        {
            struct nk_rp_rect *r = &rects[k];
            if (r->was_packed)
            {
                struct nk_tt_packedchar *bc = &ranges[i].chardata_for_range[j];
                int advance, lsb, x0,y0,x1,y1;
                int codepoint = ranges[i].first_unicode_codepoint_in_range ?
                    ranges[i].first_unicode_codepoint_in_range + j :
                    ranges[i].array_of_unicode_codepoints[j];
                int glyph = nk_tt_FindGlyphIndex(info, codepoint);
                nk_rp_coord pad = (nk_rp_coord) spc->padding;

                /* pad on left and top */
                r->x = (nk_rp_coord)((int)r->x + (int)pad);
                r->y = (nk_rp_coord)((int)r->y + (int)pad);
                r->w = (nk_rp_coord)((int)r->w - (int)pad);
                r->h = (nk_rp_coord)((int)r->h - (int)pad);

                nk_tt_GetGlyphHMetrics(info, glyph, &advance, &lsb);
                nk_tt_GetGlyphBitmapBox(info, glyph, scale * (float)spc->h_oversample,
                        (scale * (float)spc->v_oversample), &x0,&y0,&x1,&y1);
                nk_tt_MakeGlyphBitmapSubpixel(info, spc->pixels + r->x + r->y*spc->stride_in_bytes,
                    (int)(r->w - spc->h_oversample+1), (int)(r->h - spc->v_oversample+1),
                    spc->stride_in_bytes, scale * (float)spc->h_oversample,
                    scale * (float)spc->v_oversample, 0,0, glyph, alloc);

                if (spc->h_oversample > 1)
                   nk_tt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
                        r->w, r->h, spc->stride_in_bytes, (int)spc->h_oversample);

                if (spc->v_oversample > 1)
                   nk_tt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
                        r->w, r->h, spc->stride_in_bytes, (int)spc->v_oversample);

                bc->x0       = (nk_ushort)  r->x;
                bc->y0       = (nk_ushort)  r->y;
                bc->x1       = (nk_ushort) (r->x + r->w);
                bc->y1       = (nk_ushort) (r->y + r->h);
                bc->xadvance = scale * (float)advance;
                bc->xoff     = (float)  x0 * recip_h + sub_x;
                bc->yoff     = (float)  y0 * recip_v + sub_y;
                bc->xoff2    = ((float)x0 + r->w) * recip_h + sub_x;
                bc->yoff2    = ((float)y0 + r->h) * recip_v + sub_y;
            } else {
                return_value = 0; /* if any fail, report failure */
            }
            ++k;
        }
    }
    /* restore original values */
    spc->h_oversample = (unsigned int)old_h_over;
    spc->v_oversample = (unsigned int)old_v_over;
    return return_value;
}

NK_INTERN void
nk_tt_GetPackedQuad(struct nk_tt_packedchar *chardata, int pw, int ph,
    int char_index, float *xpos, float *ypos, struct nk_tt_aligned_quad *q,
    int align_to_integer)
{
    float ipw = 1.0f / (float)pw, iph = 1.0f / (float)ph;
    struct nk_tt_packedchar *b = (struct nk_tt_packedchar*)(chardata + char_index);
    if (align_to_integer) {
        int tx = nk_ifloorf((*xpos + b->xoff) + 0.5f);
        int ty = nk_ifloorf((*ypos + b->yoff) + 0.5f);

        float x = (float)tx;
        float y = (float)ty;

        q->x0 = x;
        q->y0 = y;
        q->x1 = x + b->xoff2 - b->xoff;
        q->y1 = y + b->yoff2 - b->yoff;
    } else {
        q->x0 = *xpos + b->xoff;
        q->y0 = *ypos + b->yoff;
        q->x1 = *xpos + b->xoff2;
        q->y1 = *ypos + b->yoff2;
    }
    q->s0 = b->x0 * ipw;
    q->t0 = b->y0 * iph;
    q->s1 = b->x1 * ipw;
    q->t1 = b->y1 * iph;
    *xpos += b->xadvance;
}

/* -------------------------------------------------------------
 *
 *                          FONT BAKING
 *
 * --------------------------------------------------------------*/
struct nk_font_bake_data {
    struct nk_tt_fontinfo info;
    struct nk_rp_rect *rects;
    struct nk_tt_pack_range *ranges;
    nk_rune range_count;
};

struct nk_font_baker {
    struct nk_allocator alloc;
    struct nk_tt_pack_context spc;
    struct nk_font_bake_data *build;
    struct nk_tt_packedchar *packed_chars;
    struct nk_rp_rect *rects;
    struct nk_tt_pack_range *ranges;
};

NK_GLOBAL const nk_size nk_rect_align = NK_ALIGNOF(struct nk_rp_rect);
NK_GLOBAL const nk_size nk_range_align = NK_ALIGNOF(struct nk_tt_pack_range);
NK_GLOBAL const nk_size nk_char_align = NK_ALIGNOF(struct nk_tt_packedchar);
NK_GLOBAL const nk_size nk_build_align = NK_ALIGNOF(struct nk_font_bake_data);
NK_GLOBAL const nk_size nk_baker_align = NK_ALIGNOF(struct nk_font_baker);

NK_INTERN int
nk_range_count(const nk_rune *range)
{
    const nk_rune *iter = range;
    NK_ASSERT(range);
    if (!range) return 0;
    while (*(iter++) != 0);
    return (iter == range) ? 0 : (int)((iter - range)/2);
}

NK_INTERN int
nk_range_glyph_count(const nk_rune *range, int count)
{
    int i = 0;
    int total_glyphs = 0;
    for (i = 0; i < count; ++i) {
        int diff;
        nk_rune f = range[(i*2)+0];
        nk_rune t = range[(i*2)+1];
        NK_ASSERT(t >= f);
        diff = (int)((t - f) + 1);
        total_glyphs += diff;
    }
    return total_glyphs;
}

NK_API const nk_rune*
nk_font_default_glyph_ranges(void)
{
    NK_STORAGE const nk_rune ranges[] = {0x0020, 0x00FF, 0};
    return ranges;
}

NK_API const nk_rune*
nk_font_chinese_glyph_ranges(void)
{
    NK_STORAGE const nk_rune ranges[] = {
        0x0020, 0x00FF,
        0x3000, 0x30FF,
        0x31F0, 0x31FF,
        0xFF00, 0xFFEF,
        0x4e00, 0x9FAF,
        0
    };
    return ranges;
}

NK_API const nk_rune*
nk_font_cyrillic_glyph_ranges(void)
{
    NK_STORAGE const nk_rune ranges[] = {
        0x0020, 0x00FF,
        0x0400, 0x052F,
        0x2DE0, 0x2DFF,
        0xA640, 0xA69F,
        0
    };
    return ranges;
}

NK_API const nk_rune*
nk_font_korean_glyph_ranges(void)
{
    NK_STORAGE const nk_rune ranges[] = {
        0x0020, 0x00FF,
        0x3131, 0x3163,
        0xAC00, 0xD79D,
        0
    };
    return ranges;
}

NK_INTERN void
nk_font_baker_memory(nk_size *temp, int *glyph_count,
    struct nk_font_config *config_list, int count)
{
    int range_count = 0;
    int total_range_count = 0;
    struct nk_font_config *iter;

    NK_ASSERT(config_list);
    NK_ASSERT(glyph_count);
    if (!config_list) {
        *temp = 0;
        *glyph_count = 0;
        return;
    }

    *glyph_count = 0;
    if (!config_list->range)
        config_list->range = nk_font_default_glyph_ranges();
    for (iter = config_list; iter; iter = iter->next) {
        range_count = nk_range_count(iter->range);
        total_range_count += range_count;
        *glyph_count += nk_range_glyph_count(iter->range, range_count);
    }

    *temp = (nk_size)*glyph_count * sizeof(struct nk_rp_rect);
    *temp += (nk_size)total_range_count * sizeof(struct nk_tt_pack_range);
    *temp += (nk_size)*glyph_count * sizeof(struct nk_tt_packedchar);
    *temp += (nk_size)count * sizeof(struct nk_font_bake_data);
    *temp += sizeof(struct nk_font_baker);
    *temp += nk_rect_align + nk_range_align + nk_char_align;
    *temp += nk_build_align + nk_baker_align;
}

NK_INTERN struct nk_font_baker*
nk_font_baker(void *memory, int glyph_count, int count, struct nk_allocator *alloc)
{
    struct nk_font_baker *baker;
    if (!memory) return 0;
    /* setup baker inside a memory block  */
    baker = (struct nk_font_baker*)NK_ALIGN_PTR(memory, nk_baker_align);
    baker->build = (struct nk_font_bake_data*)NK_ALIGN_PTR((baker + 1), nk_build_align);
    baker->packed_chars = (struct nk_tt_packedchar*)NK_ALIGN_PTR((baker->build + count), nk_char_align);
    baker->rects = (struct nk_rp_rect*)NK_ALIGN_PTR((baker->packed_chars + glyph_count), nk_rect_align);
    baker->ranges = (struct nk_tt_pack_range*)NK_ALIGN_PTR((baker->rects + glyph_count), nk_range_align);
    baker->alloc = *alloc;
    return baker;
}

NK_INTERN int
nk_font_bake_pack(struct nk_font_baker *baker,
    nk_size *image_memory, int *width, int *height, struct nk_recti *custom,
    const struct nk_font_config *config_list, int count,
    struct nk_allocator *alloc)
{
    NK_STORAGE const nk_size max_height = 1024 * 32;
    const struct nk_font_config *config_iter;
    int total_glyph_count = 0;
    int total_range_count = 0;
    int range_count = 0;
    int i = 0;

    NK_ASSERT(image_memory);
    NK_ASSERT(width);
    NK_ASSERT(height);
    NK_ASSERT(config_list);
    NK_ASSERT(count);
    NK_ASSERT(alloc);

    if (!image_memory || !width || !height || !config_list || !count) return nk_false;
    for (config_iter = config_list; config_iter; config_iter = config_iter->next) {
        range_count = nk_range_count(config_iter->range);
        total_range_count += range_count;
        total_glyph_count += nk_range_glyph_count(config_iter->range, range_count);
    }

    /* setup font baker from temporary memory */
    for (config_iter = config_list; config_iter; config_iter = config_iter->next) {
        const struct nk_font_config *cfg = config_iter;
        if (!nk_tt_InitFont(&baker->build[i++].info, (const unsigned char*)cfg->ttf_blob, 0))
            return nk_false;
    }

    *height = 0;
    *width = (total_glyph_count > 1000) ? 1024 : 512;
    nk_tt_PackBegin(&baker->spc, 0, (int)*width, (int)max_height, 0, 1, alloc);
    {
        int input_i = 0;
        int range_n = 0;
        int rect_n = 0;
        int char_n = 0;

        if (custom) {
            /* pack custom user data first so it will be in the upper left corner*/
            struct nk_rp_rect custom_space;
            nk_zero(&custom_space, sizeof(custom_space));
            custom_space.w = (nk_rp_coord)((custom->w * 2) + 1);
            custom_space.h = (nk_rp_coord)(custom->h + 1);

            nk_tt_PackSetOversampling(&baker->spc, 1, 1);
            nk_rp_pack_rects((struct nk_rp_context*)baker->spc.pack_info, &custom_space, 1);
            *height = NK_MAX(*height, (int)(custom_space.y + custom_space.h));

            custom->x = (short)custom_space.x;
            custom->y = (short)custom_space.y;
            custom->w = (short)custom_space.w;
            custom->h = (short)custom_space.h;
        }

        /* first font pass: pack all glyphs */
        for (input_i = 0, config_iter = config_list; input_i < count && config_iter;
            input_i++, config_iter = config_iter->next)
        {
            int n = 0;
            int glyph_count;
            const nk_rune *in_range;
            const struct nk_font_config *cfg = config_iter;
            struct nk_font_bake_data *tmp = &baker->build[input_i];

            /* count glyphs + ranges in current font */
            glyph_count = 0; range_count = 0;
            for (in_range = cfg->range; in_range[0] && in_range[1]; in_range += 2) {
                glyph_count += (int)(in_range[1] - in_range[0]) + 1;
                range_count++;
            }

            /* setup ranges  */
            tmp->ranges = baker->ranges + range_n;
            tmp->range_count = (nk_rune)range_count;
            range_n += range_count;
            for (i = 0; i < range_count; ++i) {
                in_range = &cfg->range[i * 2];
                tmp->ranges[i].font_size = cfg->size;
                tmp->ranges[i].first_unicode_codepoint_in_range = (int)in_range[0];
                tmp->ranges[i].num_chars = (int)(in_range[1]- in_range[0]) + 1;
                tmp->ranges[i].chardata_for_range = baker->packed_chars + char_n;
                char_n += tmp->ranges[i].num_chars;
            }

            /* pack */
            tmp->rects = baker->rects + rect_n;
            rect_n += glyph_count;
            nk_tt_PackSetOversampling(&baker->spc, cfg->oversample_h, cfg->oversample_v);
            n = nk_tt_PackFontRangesGatherRects(&baker->spc, &tmp->info,
                tmp->ranges, (int)tmp->range_count, tmp->rects);
            nk_rp_pack_rects((struct nk_rp_context*)baker->spc.pack_info, tmp->rects, (int)n);

            /* texture height */
            for (i = 0; i < n; ++i) {
                if (tmp->rects[i].was_packed)
                    *height = NK_MAX(*height, tmp->rects[i].y + tmp->rects[i].h);
            }
        }
        NK_ASSERT(rect_n == total_glyph_count);
        NK_ASSERT(char_n == total_glyph_count);
        NK_ASSERT(range_n == total_range_count);
    }
    *height = (int)nk_round_up_pow2((nk_uint)*height);
    *image_memory = (nk_size)(*width) * (nk_size)(*height);
    return nk_true;
}

NK_INTERN void
nk_font_bake(struct nk_font_baker *baker, void *image_memory, int width, int height,
    struct nk_font_glyph *glyphs, int glyphs_count,
    const struct nk_font_config *config_list, int font_count)
{
    int input_i = 0;
    nk_rune glyph_n = 0;
    const struct nk_font_config *config_iter;

    NK_ASSERT(image_memory);
    NK_ASSERT(width);
    NK_ASSERT(height);
    NK_ASSERT(config_list);
    NK_ASSERT(baker);
    NK_ASSERT(font_count);
    NK_ASSERT(glyphs_count);
    if (!image_memory || !width || !height || !config_list ||
        !font_count || !glyphs || !glyphs_count)
        return;

    /* second font pass: render glyphs */
    nk_zero(image_memory, (nk_size)((nk_size)width * (nk_size)height));
    baker->spc.pixels = (unsigned char*)image_memory;
    baker->spc.height = (int)height;
    for (input_i = 0, config_iter = config_list; input_i < font_count && config_iter;
        ++input_i, config_iter = config_iter->next)
    {
        const struct nk_font_config *cfg = config_iter;
        struct nk_font_bake_data *tmp = &baker->build[input_i];
        nk_tt_PackSetOversampling(&baker->spc, cfg->oversample_h, cfg->oversample_v);
        nk_tt_PackFontRangesRenderIntoRects(&baker->spc, &tmp->info, tmp->ranges,
            (int)tmp->range_count, tmp->rects, &baker->alloc);
    }
    nk_tt_PackEnd(&baker->spc, &baker->alloc);

    /* third pass: setup font and glyphs */
    for (input_i = 0, config_iter = config_list; input_i < font_count && config_iter;
        ++input_i, config_iter = config_iter->next)
    {
        nk_size i = 0;
        int char_idx = 0;
        nk_rune glyph_count = 0;
        const struct nk_font_config *cfg = config_iter;
        struct nk_font_bake_data *tmp = &baker->build[input_i];
        struct nk_baked_font *dst_font = cfg->font;

        float font_scale = nk_tt_ScaleForPixelHeight(&tmp->info, cfg->size);
        int unscaled_ascent, unscaled_descent, unscaled_line_gap;
        nk_tt_GetFontVMetrics(&tmp->info, &unscaled_ascent, &unscaled_descent,
                                &unscaled_line_gap);

        /* fill baked font */
        if (!cfg->merge_mode) {
            dst_font->ranges = cfg->range;
            dst_font->height = cfg->size;
            dst_font->ascent = ((float)unscaled_ascent * font_scale);
            dst_font->descent = ((float)unscaled_descent * font_scale);
            dst_font->glyph_offset = glyph_n;
        }

        /* fill own baked font glyph array */
        for (i = 0; i < tmp->range_count; ++i)
        {
            struct nk_tt_pack_range *range = &tmp->ranges[i];
            for (char_idx = 0; char_idx < range->num_chars; char_idx++)
            {
                nk_rune codepoint = 0;
                float dummy_x = 0, dummy_y = 0;
                struct nk_tt_aligned_quad q;
                struct nk_font_glyph *glyph;

                /* query glyph bounds from stb_truetype */
                const struct nk_tt_packedchar *pc = &range->chardata_for_range[char_idx];
                if (!pc->x0 && !pc->x1 && !pc->y0 && !pc->y1) continue;
                codepoint = (nk_rune)(range->first_unicode_codepoint_in_range + char_idx);
                nk_tt_GetPackedQuad(range->chardata_for_range, (int)width,
                    (int)height, char_idx, &dummy_x, &dummy_y, &q, 0);

                /* fill own glyph type with data */
                glyph = &glyphs[dst_font->glyph_offset + (unsigned int)glyph_count];
                glyph->codepoint = codepoint;
                glyph->x0 = q.x0; glyph->y0 = q.y0;
                glyph->x1 = q.x1; glyph->y1 = q.y1;
                glyph->y0 += (dst_font->ascent + 0.5f);
                glyph->y1 += (dst_font->ascent + 0.5f);
                glyph->w = glyph->x1 - glyph->x0 + 0.5f;
                glyph->h = glyph->y1 - glyph->y0;

                if (cfg->coord_type == NK_COORD_PIXEL) {
                    glyph->u0 = q.s0 * (float)width;
                    glyph->v0 = q.t0 * (float)height;
                    glyph->u1 = q.s1 * (float)width;
                    glyph->v1 = q.t1 * (float)height;
                } else {
                    glyph->u0 = q.s0;
                    glyph->v0 = q.t0;
                    glyph->u1 = q.s1;
                    glyph->v1 = q.t1;
                }
                glyph->xadvance = (pc->xadvance + cfg->spacing.x);
                if (cfg->pixel_snap)
                    glyph->xadvance = (float)(int)(glyph->xadvance + 0.5f);
                glyph_count++;
            }
        }
        dst_font->glyph_count = glyph_count;
        glyph_n += dst_font->glyph_count;
    }
}

NK_INTERN void
nk_font_bake_custom_data(void *img_memory, int img_width, int img_height,
    struct nk_recti img_dst, const char *texture_data_mask, int tex_width,
    int tex_height, char white, char black)
{
    nk_byte *pixels;
    int y = 0;
    int x = 0;
    int n = 0;

    NK_ASSERT(img_memory);
    NK_ASSERT(img_width);
    NK_ASSERT(img_height);
    NK_ASSERT(texture_data_mask);
    NK_UNUSED(tex_height);
    if (!img_memory || !img_width || !img_height || !texture_data_mask)
        return;

    pixels = (nk_byte*)img_memory;
    for (y = 0, n = 0; y < tex_height; ++y) {
        for (x = 0; x < tex_width; ++x, ++n) {
            const int off0 = ((img_dst.x + x) + (img_dst.y + y) * img_width);
            const int off1 = off0 + 1 + tex_width;
            pixels[off0] = (texture_data_mask[n] == white) ? 0xFF : 0x00;
            pixels[off1] = (texture_data_mask[n] == black) ? 0xFF : 0x00;
        }
    }
}

NK_INTERN void
nk_font_bake_convert(void *out_memory, int img_width, int img_height,
    const void *in_memory)
{
    int n = 0;
    nk_rune *dst;
    const nk_byte *src;

    NK_ASSERT(out_memory);
    NK_ASSERT(in_memory);
    NK_ASSERT(img_width);
    NK_ASSERT(img_height);
    if (!out_memory || !in_memory || !img_height || !img_width) return;

    dst = (nk_rune*)out_memory;
    src = (const nk_byte*)in_memory;
    for (n = (int)(img_width * img_height); n > 0; n--)
        *dst++ = ((nk_rune)(*src++) << 24) | 0x00FFFFFF;
}

/* -------------------------------------------------------------
 *
 *                          FONT
 *
 * --------------------------------------------------------------*/
NK_INTERN float
nk_font_text_width(nk_handle handle, float height, const char *text, int len)
{
    nk_rune unicode;
    int text_len  = 0;
    float text_width = 0;
    int glyph_len = 0;
    float scale = 0;

    struct nk_font *font = (struct nk_font*)handle.ptr;
    NK_ASSERT(font);
    NK_ASSERT(font->glyphs);
    if (!font || !text || !len)
        return 0;

    scale = height/font->info.height;
    glyph_len = text_len = nk_utf_decode(text, &unicode, (int)len);
    if (!glyph_len) return 0;
    while (text_len <= (int)len && glyph_len) {
        const struct nk_font_glyph *g;
        if (unicode == NK_UTF_INVALID) break;

        /* query currently drawn glyph information */
        g = nk_font_find_glyph(font, unicode);
        text_width += g->xadvance * scale;

        /* offset next glyph */
        glyph_len = nk_utf_decode(text + text_len, &unicode, (int)len - text_len);
        text_len += glyph_len;
    }
    return text_width;
}

#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
NK_INTERN void
nk_font_query_font_glyph(nk_handle handle, float height,
    struct nk_user_font_glyph *glyph, nk_rune codepoint, nk_rune next_codepoint)
{
    float scale;
    const struct nk_font_glyph *g;
    struct nk_font *font;

    NK_ASSERT(glyph);
    NK_UNUSED(next_codepoint);

    font = (struct nk_font*)handle.ptr;
    NK_ASSERT(font);
    NK_ASSERT(font->glyphs);
    if (!font || !glyph)
        return;

    scale = height/font->info.height;
    g = nk_font_find_glyph(font, codepoint);
    glyph->width = (g->x1 - g->x0) * scale;
    glyph->height = (g->y1 - g->y0) * scale;
    glyph->offset = nk_vec2(g->x0 * scale, g->y0 * scale);
    glyph->xadvance = (g->xadvance * scale);
    glyph->uv[0] = nk_vec2(g->u0, g->v0);
    glyph->uv[1] = nk_vec2(g->u1, g->v1);
}
#endif

NK_API const struct nk_font_glyph*
nk_font_find_glyph(struct nk_font *font, nk_rune unicode)
{
    int i = 0;
    int count;
    int total_glyphs = 0;
    const struct nk_font_glyph *glyph = 0;

    NK_ASSERT(font);
    NK_ASSERT(font->glyphs);
    NK_ASSERT(font->info.ranges);
    if (!font || !font->glyphs) return 0;

    glyph = font->fallback;
    count = nk_range_count(font->info.ranges);
    for (i = 0; i < count; ++i) {
        nk_rune f = font->info.ranges[(i*2)+0];
        nk_rune t = font->info.ranges[(i*2)+1];
        int diff = (int)((t - f) + 1);
        if (unicode >= f && unicode <= t)
            return &font->glyphs[((nk_rune)total_glyphs + (unicode - f))];
        total_glyphs += diff;
    }
    return glyph;
}

NK_INTERN void
nk_font_init(struct nk_font *font, float pixel_height,
    nk_rune fallback_codepoint, struct nk_font_glyph *glyphs,
    const struct nk_baked_font *baked_font, nk_handle atlas)
{
    struct nk_baked_font baked;
    NK_ASSERT(font);
    NK_ASSERT(glyphs);
    NK_ASSERT(baked_font);
    if (!font || !glyphs || !baked_font)
        return;

    baked = *baked_font;
    font->fallback = 0;
    font->info = baked;
    font->scale = (float)pixel_height / (float)font->info.height;
    font->glyphs = &glyphs[baked_font->glyph_offset];
    font->texture = atlas;
    font->fallback_codepoint = fallback_codepoint;
    font->fallback = nk_font_find_glyph(font, fallback_codepoint);

    font->handle.height = font->info.height * font->scale;
    font->handle.width = nk_font_text_width;
    font->handle.userdata.ptr = font;
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
    font->handle.query = nk_font_query_font_glyph;
    font->handle.texture = font->texture;
#endif
}

/* ---------------------------------------------------------------------------
 *
 *                          DEFAULT FONT
 *
 * ProggyClean.ttf
 * Copyright (c) 2004, 2005 Tristan Grimmer
 * MIT license (see License.txt in http://www.upperbounds.net/download/ProggyClean.ttf.zip)
 * Download and more information at http://upperbounds.net
 *-----------------------------------------------------------------------------*/
#ifdef NK_INCLUDE_DEFAULT_FONT

 #ifdef __clang__
#pragma clang diagnostic push

#pragma clang diagnostic ignored "-Woverlength-strings"
#elif defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Woverlength-strings"
#endif

NK_GLOBAL const char nk_proggy_clean_ttf_compressed_data_base85[11980+1] =
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#endif /* NK_INCLUDE_DEFAULT_FONT */

#define NK_CURSOR_DATA_W 90
#define NK_CURSOR_DATA_H 27
NK_GLOBAL const char nk_custom_cursor_data[NK_CURSOR_DATA_W * NK_CURSOR_DATA_H + 1] =
{
    "..-         -XXXXXXX-    X    -           X           -XXXXXXX          -          XXXXXXX"
    "..-         -X.....X-   X.X   -          X.X          -X.....X          -          X.....X"
    "---         -XXX.XXX-  X...X  -         X...X         -X....X           -           X....X"
    "X           -  X.X  - X.....X -        X.....X        -X...X            -            X...X"
    "XX          -  X.X  -X.......X-       X.......X       -X..X.X           -           X.X..X"
    "X.X         -  X.X  -XXXX.XXXX-       XXXX.XXXX       -X.X X.X          -          X.X X.X"
    "X..X        -  X.X  -   X.X   -          X.X          -XX   X.X         -         X.X   XX"
    "X...X       -  X.X  -   X.X   -    XX    X.X    XX    -      X.X        -        X.X      "
    "X....X      -  X.X  -   X.X   -   X.X    X.X    X.X   -       X.X       -       X.X       "
    "X.....X     -  X.X  -   X.X   -  X..X    X.X    X..X  -        X.X      -      X.X        "
    "X......X    -  X.X  -   X.X   - X...XXXXXX.XXXXXX...X -         X.X   XX-XX   X.X         "
    "X.......X   -  X.X  -   X.X   -X.....................X-          X.X X.X-X.X X.X          "
    "X........X  -  X.X  -   X.X   - X...XXXXXX.XXXXXX...X -           X.X..X-X..X.X           "
    "X.........X -XXX.XXX-   X.X   -  X..X    X.X    X..X  -            X...X-X...X            "
    "X..........X-X.....X-   X.X   -   X.X    X.X    X.X   -           X....X-X....X           "
    "X......XXXXX-XXXXXXX-   X.X   -    XX    X.X    XX    -          X.....X-X.....X          "
    "X...X..X    ---------   X.X   -          X.X          -          XXXXXXX-XXXXXXX          "
    "X..X X..X   -       -XXXX.XXXX-       XXXX.XXXX       ------------------------------------"
    "X.X  X..X   -       -X.......X-       X.......X       -    XX           XX    -           "
    "XX    X..X  -       - X.....X -        X.....X        -   X.X           X.X   -           "
    "      X..X          -  X...X  -         X...X         -  X..X           X..X  -           "
    "       XX           -   X.X   -          X.X          - X...XXXXXXXXXXXXX...X -           "
    "------------        -    X    -           X           -X.....................X-           "
    "                    ----------------------------------- X...XXXXXXXXXXXXX...X -           "
    "                                                      -  X..X           X..X  -           "
    "                                                      -   X.X           X.X   -           "
    "                                                      -    XX           XX    -           "
};

#ifdef __clang__
#pragma clang diagnostic pop
#elif defined(__GNUC__) || defined(__GNUG__)
#pragma GCC diagnostic pop
#endif

NK_INTERN unsigned int
nk_decompress_length(unsigned char *input)
{
    return (unsigned int)((input[8] << 24) + (input[9] << 16) + (input[10] << 8) + input[11]);
}

NK_GLOBAL unsigned char *nk__barrier;
NK_GLOBAL unsigned char *nk__barrier2;
NK_GLOBAL unsigned char *nk__barrier3;
NK_GLOBAL unsigned char *nk__barrier4;
NK_GLOBAL unsigned char *nk__dout;

NK_INTERN void
nk__match(unsigned char *data, unsigned int length)
{
    /* INVERSE of memmove... write each byte before copying the next...*/
    NK_ASSERT (nk__dout + length <= nk__barrier);
    if (nk__dout + length > nk__barrier) { nk__dout += length; return; }
    if (data < nk__barrier4) { nk__dout = nk__barrier+1; return; }
    while (length--) *nk__dout++ = *data++;
}

NK_INTERN void
nk__lit(unsigned char *data, unsigned int length)
{
    NK_ASSERT (nk__dout + length <= nk__barrier);
    if (nk__dout + length > nk__barrier) { nk__dout += length; return; }
    if (data < nk__barrier2) { nk__dout = nk__barrier+1; return; }
    NK_MEMCPY(nk__dout, data, length);
    nk__dout += length;
}

#define nk__in2(x)   ((i[x] << 8) + i[(x)+1])
#define nk__in3(x)   ((i[x] << 16) + nk__in2((x)+1))
#define nk__in4(x)   ((i[x] << 24) + nk__in3((x)+1))

NK_INTERN unsigned char*
nk_decompress_token(unsigned char *i)
{
    if (*i >= 0x20) { /* use fewer if's for cases that expand small */
        if (*i >= 0x80)       nk__match(nk__dout-i[1]-1, (unsigned int)i[0] - 0x80 + 1), i += 2;
        else if (*i >= 0x40)  nk__match(nk__dout-(nk__in2(0) - 0x4000 + 1), (unsigned int)i[2]+1), i += 3;
        else /* *i >= 0x20 */ nk__lit(i+1, (unsigned int)i[0] - 0x20 + 1), i += 1 + (i[0] - 0x20 + 1);
    } else { /* more ifs for cases that expand large, since overhead is amortized */
        if (*i >= 0x18)       nk__match(nk__dout-(unsigned int)(nk__in3(0) - 0x180000 + 1), (unsigned int)i[3]+1), i += 4;
        else if (*i >= 0x10)  nk__match(nk__dout-(unsigned int)(nk__in3(0) - 0x100000 + 1), (unsigned int)nk__in2(3)+1), i += 5;
        else if (*i >= 0x08)  nk__lit(i+2, (unsigned int)nk__in2(0) - 0x0800 + 1), i += 2 + (nk__in2(0) - 0x0800 + 1);
        else if (*i == 0x07)  nk__lit(i+3, (unsigned int)nk__in2(1) + 1), i += 3 + (nk__in2(1) + 1);
        else if (*i == 0x06)  nk__match(nk__dout-(unsigned int)(nk__in3(1)+1), i[4]+1u), i += 5;
        else if (*i == 0x04)  nk__match(nk__dout-(unsigned int)(nk__in3(1)+1), (unsigned int)nk__in2(4)+1u), i += 6;
    }
    return i;
}

NK_INTERN unsigned int
nk_adler32(unsigned int adler32, unsigned char *buffer, unsigned int buflen)
{
    const unsigned long ADLER_MOD = 65521;
    unsigned long s1 = adler32 & 0xffff, s2 = adler32 >> 16;
    unsigned long blocklen, i;

    blocklen = buflen % 5552;
    while (buflen) {
        for (i=0; i + 7 < blocklen; i += 8) {
            s1 += buffer[0]; s2 += s1;
            s1 += buffer[1]; s2 += s1;
            s1 += buffer[2]; s2 += s1;
            s1 += buffer[3]; s2 += s1;
            s1 += buffer[4]; s2 += s1;
            s1 += buffer[5]; s2 += s1;
            s1 += buffer[6]; s2 += s1;
            s1 += buffer[7]; s2 += s1;
            buffer += 8;
        }
        for (; i < blocklen; ++i) {
            s1 += *buffer++; s2 += s1;
        }

        s1 %= ADLER_MOD; s2 %= ADLER_MOD;
        buflen -= (unsigned int)blocklen;
        blocklen = 5552;
    }
    return (unsigned int)(s2 << 16) + (unsigned int)s1;
}

NK_INTERN unsigned int
nk_decompress(unsigned char *output, unsigned char *i, unsigned int length)
{
    unsigned int olen;
    if (nk__in4(0) != 0x57bC0000) return 0;
    if (nk__in4(4) != 0)          return 0; /* error! stream is > 4GB */
    olen = nk_decompress_length(i);
    nk__barrier2 = i;
    nk__barrier3 = i+length;
    nk__barrier = output + olen;
    nk__barrier4 = output;
    i += 16;

    nk__dout = output;
    for (;;) {
        unsigned char *old_i = i;
        i = nk_decompress_token(i);
        if (i == old_i) {
            if (*i == 0x05 && i[1] == 0xfa) {
                NK_ASSERT(nk__dout == output + olen);
                if (nk__dout != output + olen) return 0;
                if (nk_adler32(1, output, olen) != (unsigned int) nk__in4(2))
                    return 0;
                return olen;
            } else {
                NK_ASSERT(0); /* NOTREACHED */
                return 0;
            }
        }
        NK_ASSERT(nk__dout <= output + olen);
        if (nk__dout > output + olen)
            return 0;
    }
}

NK_INTERN unsigned int
nk_decode_85_byte(char c)
{ return (unsigned int)((c >= '\\') ? c-36 : c-35); }

NK_INTERN void
nk_decode_85(unsigned char* dst, const unsigned char* src)
{
    while (*src)
    {
        unsigned int tmp =
            nk_decode_85_byte((char)src[0]) +
            85 * (nk_decode_85_byte((char)src[1]) +
            85 * (nk_decode_85_byte((char)src[2]) +
            85 * (nk_decode_85_byte((char)src[3]) +
            85 * nk_decode_85_byte((char)src[4]))));

        /* we can't assume little-endianess. */
        dst[0] = (unsigned char)((tmp >> 0) & 0xFF);
        dst[1] = (unsigned char)((tmp >> 8) & 0xFF);
        dst[2] = (unsigned char)((tmp >> 16) & 0xFF);
        dst[3] = (unsigned char)((tmp >> 24) & 0xFF);

        src += 5;
        dst += 4;
    }
}

/* -------------------------------------------------------------
 *
 *                          FONT ATLAS
 *
 * --------------------------------------------------------------*/
NK_API struct nk_font_config
nk_font_config(float pixel_height)
{
    struct nk_font_config cfg;
    nk_zero_struct(cfg);
    cfg.ttf_blob = 0;
    cfg.ttf_size = 0;
    cfg.ttf_data_owned_by_atlas = 0;
    cfg.size = pixel_height;
    cfg.oversample_h = 3;
    cfg.oversample_v = 1;
    cfg.pixel_snap = 0;
    cfg.coord_type = NK_COORD_UV;
    cfg.spacing = nk_vec2(0,0);
    cfg.range = nk_font_default_glyph_ranges();
    cfg.merge_mode = 0;
    cfg.fallback_glyph = '?';
    cfg.font = 0;
    return cfg;
}

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void
nk_font_atlas_init_default(struct nk_font_atlas *atlas)
{
    NK_ASSERT(atlas);
    if (!atlas) return;
    nk_zero_struct(*atlas);
    atlas->temporary.userdata.ptr = 0;
    atlas->temporary.alloc = nk_malloc;
    atlas->temporary.free = nk_mfree;
    atlas->permanent.userdata.ptr = 0;
    atlas->permanent.alloc = nk_malloc;
    atlas->permanent.free = nk_mfree;
}
#endif

NK_API void
nk_font_atlas_init(struct nk_font_atlas *atlas, struct nk_allocator *alloc)
{
    NK_ASSERT(atlas);
    NK_ASSERT(alloc);
    if (!atlas || !alloc) return;
    nk_zero_struct(*atlas);
    atlas->permanent = *alloc;
    atlas->temporary = *alloc;
}

NK_API void
nk_font_atlas_init_custom(struct nk_font_atlas *atlas,
    struct nk_allocator *permanent, struct nk_allocator *temporary)
{
    NK_ASSERT(atlas);
    NK_ASSERT(permanent);
    NK_ASSERT(temporary);
    if (!atlas || !permanent || !temporary) return;
    nk_zero_struct(*atlas);
    atlas->permanent = *permanent;
    atlas->temporary = *temporary;
}

NK_API void
nk_font_atlas_begin(struct nk_font_atlas *atlas)
{
    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc && atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc && atlas->permanent.free);
    if (!atlas || !atlas->permanent.alloc || !atlas->permanent.free ||
        !atlas->temporary.alloc || !atlas->temporary.free) return;
    if (atlas->glyphs) {
        atlas->permanent.free(atlas->permanent.userdata, atlas->glyphs);
        atlas->glyphs = 0;
    }
    if (atlas->pixel) {
        atlas->permanent.free(atlas->permanent.userdata, atlas->pixel);
        atlas->pixel = 0;
    }
}

NK_API struct nk_font*
nk_font_atlas_add(struct nk_font_atlas *atlas, const struct nk_font_config *config)
{
    struct nk_font *font = 0;
    struct nk_font_config *cfg;

    NK_ASSERT(atlas);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);

    NK_ASSERT(config);
    NK_ASSERT(config->ttf_blob);
    NK_ASSERT(config->ttf_size);
    NK_ASSERT(config->size > 0.0f);

    if (!atlas || !config || !config->ttf_blob || !config->ttf_size || config->size <= 0.0f||
        !atlas->permanent.alloc || !atlas->permanent.free ||
        !atlas->temporary.alloc || !atlas->temporary.free)
        return 0;

    /* allocate and insert font config into list */
    cfg = (struct nk_font_config*)
        atlas->permanent.alloc(atlas->permanent.userdata,0, sizeof(struct nk_font_config));
    NK_MEMCPY(cfg, config, sizeof(*config));
    if (!atlas->config) {
        atlas->config = cfg;
        cfg->next = 0;
    } else {
        cfg->next = atlas->config;
        atlas->config = cfg;
    }

    /* allocate new font */
    if (!config->merge_mode) {
        font = (struct nk_font*)
            atlas->permanent.alloc(atlas->permanent.userdata,0, sizeof(struct nk_font));
        NK_ASSERT(font);
        if (!font) return 0;
        font->config = cfg;
    } else {
        NK_ASSERT(atlas->font_num);
        font = atlas->fonts;
        font->config = cfg;
    }

    /* insert font into list */
    if (!config->merge_mode) {
        if (!atlas->fonts) {
            atlas->fonts = font;
            font->next = 0;
        } else {
            font->next = atlas->fonts;
            atlas->fonts = font;
        }
        cfg->font = &font->info;
    }

    /* create own copy of .TTF font blob */
    if (!config->ttf_data_owned_by_atlas) {
        cfg->ttf_blob = atlas->permanent.alloc(atlas->permanent.userdata,0, cfg->ttf_size);
        NK_ASSERT(cfg->ttf_blob);
        if (!cfg->ttf_blob) {
            atlas->font_num++;
            return 0;
        }
        NK_MEMCPY(cfg->ttf_blob, config->ttf_blob, cfg->ttf_size);
        cfg->ttf_data_owned_by_atlas = 1;
    }
    atlas->font_num++;
    return font;
}

NK_API struct nk_font*
nk_font_atlas_add_from_memory(struct nk_font_atlas *atlas, void *memory,
    nk_size size, float height, const struct nk_font_config *config)
{
    struct nk_font_config cfg;
    NK_ASSERT(memory);
    NK_ASSERT(size);

    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);
    if (!atlas || !atlas->temporary.alloc || !atlas->temporary.free || !memory || !size ||
        !atlas->permanent.alloc || !atlas->permanent.free)
        return 0;

    cfg = (config) ? *config: nk_font_config(height);
    cfg.ttf_blob = memory;
    cfg.ttf_size = size;
    cfg.size = height;
    cfg.ttf_data_owned_by_atlas = 0;
    return nk_font_atlas_add(atlas, &cfg);
}

#ifdef NK_INCLUDE_STANDARD_IO
NK_API struct nk_font*
nk_font_atlas_add_from_file(struct nk_font_atlas *atlas, const char *file_path,
    float height, const struct nk_font_config *config)
{
    nk_size size;
    char *memory;
    struct nk_font_config cfg;

    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);

    if (!atlas || !file_path) return 0;
    memory = nk_file_load(file_path, &size, &atlas->permanent);
    if (!memory) return 0;

    cfg = (config) ? *config: nk_font_config(height);
    cfg.ttf_blob = memory;
    cfg.ttf_size = size;
    cfg.size = height;
    cfg.ttf_data_owned_by_atlas = 1;
    return nk_font_atlas_add(atlas, &cfg);
}
#endif

NK_API struct nk_font*
nk_font_atlas_add_compressed(struct nk_font_atlas *atlas,
    void *compressed_data, nk_size compressed_size, float height,
    const struct nk_font_config *config)
{
    unsigned int decompressed_size;
    void *decompressed_data;
    struct nk_font_config cfg;

    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);

    NK_ASSERT(compressed_data);
    NK_ASSERT(compressed_size);
    if (!atlas || !compressed_data || !atlas->temporary.alloc || !atlas->temporary.free ||
        !atlas->permanent.alloc || !atlas->permanent.free)
        return 0;

    decompressed_size = nk_decompress_length((unsigned char*)compressed_data);
    decompressed_data = atlas->permanent.alloc(atlas->permanent.userdata,0,decompressed_size);
    NK_ASSERT(decompressed_data);
    if (!decompressed_data) return 0;
    nk_decompress((unsigned char*)decompressed_data, (unsigned char*)compressed_data,
        (unsigned int)compressed_size);

    cfg = (config) ? *config: nk_font_config(height);
    cfg.ttf_blob = decompressed_data;
    cfg.ttf_size = decompressed_size;
    cfg.size = height;
    cfg.ttf_data_owned_by_atlas = 1;
    return nk_font_atlas_add(atlas, &cfg);
}

NK_API struct nk_font*
nk_font_atlas_add_compressed_base85(struct nk_font_atlas *atlas,
    const char *data_base85, float height, const struct nk_font_config *config)
{
    int compressed_size;
    void *compressed_data;
    struct nk_font *font;

    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);

    NK_ASSERT(data_base85);
    if (!atlas || !data_base85 || !atlas->temporary.alloc || !atlas->temporary.free ||
        !atlas->permanent.alloc || !atlas->permanent.free)
        return 0;

    compressed_size = (((int)nk_strlen(data_base85) + 4) / 5) * 4;
    compressed_data = atlas->temporary.alloc(atlas->temporary.userdata,0, (nk_size)compressed_size);
    NK_ASSERT(compressed_data);
    if (!compressed_data) return 0;
    nk_decode_85((unsigned char*)compressed_data, (const unsigned char*)data_base85);
    font = nk_font_atlas_add_compressed(atlas, compressed_data,
                    (nk_size)compressed_size, height, config);
    atlas->temporary.free(atlas->temporary.userdata, compressed_data);
    return font;
}

#ifdef NK_INCLUDE_DEFAULT_FONT
NK_API struct nk_font*
nk_font_atlas_add_default(struct nk_font_atlas *atlas,
    float pixel_height, const struct nk_font_config *config)
{
    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);
    return nk_font_atlas_add_compressed_base85(atlas,
        nk_proggy_clean_ttf_compressed_data_base85, pixel_height, config);
}
#endif

NK_API const void*
nk_font_atlas_bake(struct nk_font_atlas *atlas, int *width, int *height,
    enum nk_font_atlas_format fmt)
{
    int i = 0;
    void *tmp = 0;
    nk_size tmp_size, img_size;
    struct nk_font *font_iter;
    struct nk_font_baker *baker;

    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);

    NK_ASSERT(width);
    NK_ASSERT(height);
    if (!atlas || !width || !height ||
        !atlas->temporary.alloc || !atlas->temporary.free ||
        !atlas->permanent.alloc || !atlas->permanent.free)
        return 0;

#ifdef NK_INCLUDE_DEFAULT_FONT
    /* no font added so just use default font */
    if (!atlas->font_num)
        atlas->default_font = nk_font_atlas_add_default(atlas, 13.0f, 0);
#endif
    NK_ASSERT(atlas->font_num);
    if (!atlas->font_num) return 0;

    /* allocate temporary baker memory required for the baking process */
    nk_font_baker_memory(&tmp_size, &atlas->glyph_count, atlas->config, atlas->font_num);
    tmp = atlas->temporary.alloc(atlas->temporary.userdata,0, tmp_size);
    NK_ASSERT(tmp);
    if (!tmp) goto failed;

    /* allocate glyph memory for all fonts */
    baker = nk_font_baker(tmp, atlas->glyph_count, atlas->font_num, &atlas->temporary);
    atlas->glyphs = (struct nk_font_glyph*)atlas->permanent.alloc(
        atlas->permanent.userdata,0, sizeof(struct nk_font_glyph)*(nk_size)atlas->glyph_count);
    NK_ASSERT(atlas->glyphs);
    if (!atlas->glyphs)
        goto failed;

    /* pack all glyphs into a tight fit space */
    atlas->custom.w = (NK_CURSOR_DATA_W*2)+1;
    atlas->custom.h = NK_CURSOR_DATA_H + 1;
    if (!nk_font_bake_pack(baker, &img_size, width, height, &atlas->custom,
        atlas->config, atlas->font_num, &atlas->temporary))
        goto failed;

    /* allocate memory for the baked image font atlas */
    atlas->pixel = atlas->temporary.alloc(atlas->temporary.userdata,0, img_size);
    NK_ASSERT(atlas->pixel);
    if (!atlas->pixel)
        goto failed;

    /* bake glyphs and custom white pixel into image */
    nk_font_bake(baker, atlas->pixel, *width, *height,
        atlas->glyphs, atlas->glyph_count, atlas->config, atlas->font_num);
    nk_font_bake_custom_data(atlas->pixel, *width, *height, atlas->custom,
            nk_custom_cursor_data, NK_CURSOR_DATA_W, NK_CURSOR_DATA_H, '.', 'X');

    if (fmt == NK_FONT_ATLAS_RGBA32) {
        /* convert alpha8 image into rgba32 image */
        void *img_rgba = atlas->temporary.alloc(atlas->temporary.userdata,0,
                            (nk_size)(*width * *height * 4));
        NK_ASSERT(img_rgba);
        if (!img_rgba) goto failed;
        nk_font_bake_convert(img_rgba, *width, *height, atlas->pixel);
        atlas->temporary.free(atlas->temporary.userdata, atlas->pixel);
        atlas->pixel = img_rgba;
    }
    atlas->tex_width = *width;
    atlas->tex_height = *height;

    /* initialize each font */
    for (font_iter = atlas->fonts; font_iter; font_iter = font_iter->next) {
        struct nk_font *font = font_iter;
        struct nk_font_config *config = font->config;
        nk_font_init(font, config->size, config->fallback_glyph, atlas->glyphs,
            config->font, nk_handle_ptr(0));
    }

    /* initialize each cursor */
    {NK_STORAGE const struct nk_vec2 nk_cursor_data[NK_CURSOR_COUNT][3] = {
        /* Pos ----- Size ------- Offset --*/
        {{ 0, 3},   {12,19},    { 0, 0}},
        {{13, 0},   { 7,16},    { 4, 8}},
        {{31, 0},   {23,23},    {11,11}},
        {{21, 0},   { 9, 23},   { 5,11}},
        {{55,18},   {23, 9},    {11, 5}},
        {{73, 0},   {17,17},    { 9, 9}},
        {{55, 0},   {17,17},    { 9, 9}}
    };
    for (i = 0; i < NK_CURSOR_COUNT; ++i) {
        struct nk_cursor *cursor = &atlas->cursors[i];
        cursor->img.w = (unsigned short)*width;
        cursor->img.h = (unsigned short)*height;
        cursor->img.region[0] = (unsigned short)(atlas->custom.x + nk_cursor_data[i][0].x);
        cursor->img.region[1] = (unsigned short)(atlas->custom.y + nk_cursor_data[i][0].y);
        cursor->img.region[2] = (unsigned short)nk_cursor_data[i][1].x;
        cursor->img.region[3] = (unsigned short)nk_cursor_data[i][1].y;
        cursor->size = nk_cursor_data[i][1];
        cursor->offset = nk_cursor_data[i][2];
    }}
    /* free temporary memory */
    atlas->temporary.free(atlas->temporary.userdata, tmp);
    return atlas->pixel;

failed:
    /* error so cleanup all memory */
    if (tmp) atlas->temporary.free(atlas->temporary.userdata, tmp);
    if (atlas->glyphs) {
        atlas->permanent.free(atlas->permanent.userdata, atlas->glyphs);
        atlas->glyphs = 0;
    }
    if (atlas->pixel) {
        atlas->temporary.free(atlas->temporary.userdata, atlas->pixel);
        atlas->pixel = 0;
    }
    return 0;
}

NK_API void
nk_font_atlas_end(struct nk_font_atlas *atlas, nk_handle texture,
    struct nk_draw_null_texture *null)
{
    int i = 0;
    struct nk_font *font_iter;
    NK_ASSERT(atlas);
    if (!atlas) {
        if (!null) return;
        null->texture = texture;
        null->uv = nk_vec2(0.5f,0.5f);
    }
    if (null) {
        null->texture = texture;
        null->uv.x = (atlas->custom.x + 0.5f)/(float)atlas->tex_width;
        null->uv.y = (atlas->custom.y + 0.5f)/(float)atlas->tex_height;
    }
    for (font_iter = atlas->fonts; font_iter; font_iter = font_iter->next) {
        font_iter->texture = texture;
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
        font_iter->handle.texture = texture;
#endif
    }
    for (i = 0; i < NK_CURSOR_COUNT; ++i)
        atlas->cursors[i].img.handle = texture;

    atlas->temporary.free(atlas->temporary.userdata, atlas->pixel);
    atlas->pixel = 0;
    atlas->tex_width = 0;
    atlas->tex_height = 0;
    atlas->custom.x = 0;
    atlas->custom.y = 0;
    atlas->custom.w = 0;
    atlas->custom.h = 0;
}

NK_API void
nk_font_atlas_cleanup(struct nk_font_atlas *atlas)
{
    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);

    if (!atlas || !atlas->permanent.alloc || !atlas->permanent.free) return;
    if (atlas->config) {
        struct nk_font_config *iter, *next;
        for (iter = atlas->config; iter; iter = next) {
            next = iter->next;
            atlas->permanent.free(atlas->permanent.userdata, iter->ttf_blob);
            atlas->permanent.free(atlas->permanent.userdata, iter);
        }
        atlas->config = 0;
    }
}

NK_API void
nk_font_atlas_clear(struct nk_font_atlas *atlas)
{
    NK_ASSERT(atlas);
    NK_ASSERT(atlas->temporary.alloc);
    NK_ASSERT(atlas->temporary.free);
    NK_ASSERT(atlas->permanent.alloc);
    NK_ASSERT(atlas->permanent.free);
    if (!atlas || !atlas->permanent.alloc || !atlas->permanent.free) return;

    nk_font_atlas_cleanup(atlas);
    if (atlas->fonts) {
        struct nk_font *iter, *next;
        for (iter = atlas->fonts; iter; iter = next) {
            next = iter->next;
            atlas->permanent.free(atlas->permanent.userdata, iter);
        }
        atlas->fonts = 0;
    }
    if (atlas->glyphs)
        atlas->permanent.free(atlas->permanent.userdata, atlas->glyphs);
    nk_zero_struct(*atlas);
}
#endif
/* ==============================================================
 *
 *                          INPUT
 *
 * ===============================================================*/
NK_API void
nk_input_begin(struct nk_context *ctx)
{
    int i;
    struct nk_input *in;
    NK_ASSERT(ctx);
    if (!ctx) return;
    in = &ctx->input;
    for (i = 0; i < NK_BUTTON_MAX; ++i)
        in->mouse.buttons[i].clicked = 0;

    in->keyboard.text_len = 0;
    in->mouse.scroll_delta = nk_vec2(0,0);
    in->mouse.prev.x = in->mouse.pos.x;
    in->mouse.prev.y = in->mouse.pos.y;
    in->mouse.delta.x = 0;
    in->mouse.delta.y = 0;
    for (i = 0; i < NK_KEY_MAX; i++)
        in->keyboard.keys[i].clicked = 0;
}

NK_API void
nk_input_end(struct nk_context *ctx)
{
    struct nk_input *in;
    NK_ASSERT(ctx);
    if (!ctx) return;
    in = &ctx->input;
    if (in->mouse.grab)
        in->mouse.grab = 0;
    if (in->mouse.ungrab) {
        in->mouse.grabbed = 0;
        in->mouse.ungrab = 0;
        in->mouse.grab = 0;
    }
}

NK_API void
nk_input_motion(struct nk_context *ctx, int x, int y)
{
    struct nk_input *in;
    NK_ASSERT(ctx);
    if (!ctx) return;
    in = &ctx->input;
    in->mouse.pos.x = (float)x;
    in->mouse.pos.y = (float)y;
    in->mouse.delta.x = in->mouse.pos.x - in->mouse.prev.x;
    in->mouse.delta.y = in->mouse.pos.y - in->mouse.prev.y;
}

NK_API void
nk_input_key(struct nk_context *ctx, enum nk_keys key, int down)
{
    struct nk_input *in;
    NK_ASSERT(ctx);
    if (!ctx) return;
    in = &ctx->input;
    if (in->keyboard.keys[key].down != down)
        in->keyboard.keys[key].clicked++;
    in->keyboard.keys[key].down = down;
}

NK_API void
nk_input_button(struct nk_context *ctx, enum nk_buttons id, int x, int y, int down)
{
    struct nk_mouse_button *btn;
    struct nk_input *in;
    NK_ASSERT(ctx);
    if (!ctx) return;
    in = &ctx->input;
    if (in->mouse.buttons[id].down == down) return;

    btn = &in->mouse.buttons[id];
    btn->clicked_pos.x = (float)x;
    btn->clicked_pos.y = (float)y;
    btn->down = down;
    btn->clicked++;
}

NK_API void
nk_input_scroll(struct nk_context *ctx, struct nk_vec2 val)
{
    NK_ASSERT(ctx);
    if (!ctx) return;
    ctx->input.mouse.scroll_delta.x += val.x;
    ctx->input.mouse.scroll_delta.y += val.y;
}

NK_API void
nk_input_glyph(struct nk_context *ctx, const nk_glyph glyph)
{
    int len = 0;
    nk_rune unicode;
    struct nk_input *in;

    NK_ASSERT(ctx);
    if (!ctx) return;
    in = &ctx->input;

    len = nk_utf_decode(glyph, &unicode, NK_UTF_SIZE);
    if (len && ((in->keyboard.text_len + len) < NK_INPUT_MAX)) {
        nk_utf_encode(unicode, &in->keyboard.text[in->keyboard.text_len],
            NK_INPUT_MAX - in->keyboard.text_len);
        in->keyboard.text_len += len;
    }
}

NK_API void
nk_input_char(struct nk_context *ctx, char c)
{
    nk_glyph glyph;
    NK_ASSERT(ctx);
    if (!ctx) return;
    glyph[0] = c;
    nk_input_glyph(ctx, glyph);
}

NK_API void
nk_input_unicode(struct nk_context *ctx, nk_rune unicode)
{
    nk_glyph rune;
    NK_ASSERT(ctx);
    if (!ctx) return;
    nk_utf_encode(unicode, rune, NK_UTF_SIZE);
    nk_input_glyph(ctx, rune);
}

NK_API int
nk_input_has_mouse_click(const struct nk_input *i, enum nk_buttons id)
{
    const struct nk_mouse_button *btn;
    if (!i) return nk_false;
    btn = &i->mouse.buttons[id];
    return (btn->clicked && btn->down == nk_false) ? nk_true : nk_false;
}

NK_API int
nk_input_has_mouse_click_in_rect(const struct nk_input *i, enum nk_buttons id,
    struct nk_rect b)
{
    const struct nk_mouse_button *btn;
    if (!i) return nk_false;
    btn = &i->mouse.buttons[id];
    if (!NK_INBOX(btn->clicked_pos.x,btn->clicked_pos.y,b.x,b.y,b.w,b.h))
        return nk_false;
    return nk_true;
}

NK_API int
nk_input_has_mouse_click_down_in_rect(const struct nk_input *i, enum nk_buttons id,
    struct nk_rect b, int down)
{
    const struct nk_mouse_button *btn;
    if (!i) return nk_false;
    btn = &i->mouse.buttons[id];
    return nk_input_has_mouse_click_in_rect(i, id, b) && (btn->down == down);
}

NK_API int
nk_input_is_mouse_click_in_rect(const struct nk_input *i, enum nk_buttons id,
    struct nk_rect b)
{
    const struct nk_mouse_button *btn;
    if (!i) return nk_false;
    btn = &i->mouse.buttons[id];
    return (nk_input_has_mouse_click_down_in_rect(i, id, b, nk_false) &&
            btn->clicked) ? nk_true : nk_false;
}

NK_API int
nk_input_is_mouse_click_down_in_rect(const struct nk_input *i, enum nk_buttons id,
    struct nk_rect b, int down)
{
    const struct nk_mouse_button *btn;
    if (!i) return nk_false;
    btn = &i->mouse.buttons[id];
    return (nk_input_has_mouse_click_down_in_rect(i, id, b, down) &&
            btn->clicked) ? nk_true : nk_false;
}

NK_API int
nk_input_any_mouse_click_in_rect(const struct nk_input *in, struct nk_rect b)
{
    int i, down = 0;
    for (i = 0; i < NK_BUTTON_MAX; ++i)
        down = down || nk_input_is_mouse_click_in_rect(in, (enum nk_buttons)i, b);
    return down;
}

NK_API int
nk_input_is_mouse_hovering_rect(const struct nk_input *i, struct nk_rect rect)
{
    if (!i) return nk_false;
    return NK_INBOX(i->mouse.pos.x, i->mouse.pos.y, rect.x, rect.y, rect.w, rect.h);
}

NK_API int
nk_input_is_mouse_prev_hovering_rect(const struct nk_input *i, struct nk_rect rect)
{
    if (!i) return nk_false;
    return NK_INBOX(i->mouse.prev.x, i->mouse.prev.y, rect.x, rect.y, rect.w, rect.h);
}

NK_API int
nk_input_mouse_clicked(const struct nk_input *i, enum nk_buttons id, struct nk_rect rect)
{
    if (!i) return nk_false;
    if (!nk_input_is_mouse_hovering_rect(i, rect)) return nk_false;
    return nk_input_is_mouse_click_in_rect(i, id, rect);
}

NK_API int
nk_input_is_mouse_down(const struct nk_input *i, enum nk_buttons id)
{
    if (!i) return nk_false;
    return i->mouse.buttons[id].down;
}

NK_API int
nk_input_is_mouse_pressed(const struct nk_input *i, enum nk_buttons id)
{
    const struct nk_mouse_button *b;
    if (!i) return nk_false;
    b = &i->mouse.buttons[id];
    if (b->down && b->clicked)
        return nk_true;
    return nk_false;
}

NK_API int
nk_input_is_mouse_released(const struct nk_input *i, enum nk_buttons id)
{
    if (!i) return nk_false;
    return (!i->mouse.buttons[id].down && i->mouse.buttons[id].clicked);
}

NK_API int
nk_input_is_key_pressed(const struct nk_input *i, enum nk_keys key)
{
    const struct nk_key *k;
    if (!i) return nk_false;
    k = &i->keyboard.keys[key];
    if ((k->down && k->clicked) || (!k->down && k->clicked >= 2))
        return nk_true;
    return nk_false;
}

NK_API int
nk_input_is_key_released(const struct nk_input *i, enum nk_keys key)
{
    const struct nk_key *k;
    if (!i) return nk_false;
    k = &i->keyboard.keys[key];
    if ((!k->down && k->clicked) || (k->down && k->clicked >= 2))
        return nk_true;
    return nk_false;
}

NK_API int
nk_input_is_key_down(const struct nk_input *i, enum nk_keys key)
{
    const struct nk_key *k;
    if (!i) return nk_false;
    k = &i->keyboard.keys[key];
    if (k->down) return nk_true;
    return nk_false;
}

/*
 * ==============================================================
 *
 *                          TEXT EDITOR
 *
 * ===============================================================
 */
/* stb_textedit.h - v1.8  - public domain - Sean Barrett */
struct nk_text_find {
   float x,y;    /* position of n'th character */
   float height; /* height of line */
   int first_char, length; /* first char of row, and length */
   int prev_first;  /*_ first char of previous row */
};

struct nk_text_edit_row {
   float x0,x1;
   /* starting x location, end x location (allows for align=right, etc) */
   float baseline_y_delta;
   /* position of baseline relative to previous row's baseline*/
   float ymin,ymax;
   /* height of row above and below baseline */
   int num_chars;
};

/* forward declarations */
NK_INTERN void nk_textedit_makeundo_delete(struct nk_text_edit*, int, int);
NK_INTERN void nk_textedit_makeundo_insert(struct nk_text_edit*, int, int);
NK_INTERN void nk_textedit_makeundo_replace(struct nk_text_edit*, int, int, int);
#define NK_TEXT_HAS_SELECTION(s)   ((s)->select_start != (s)->select_end)

NK_INTERN float
nk_textedit_get_width(const struct nk_text_edit *edit, int line_start, int char_id,
    const struct nk_user_font *font)
{
    int len = 0;
    nk_rune unicode = 0;
    const char *str = nk_str_at_const(&edit->string, line_start + char_id, &unicode, &len);
    return font->width(font->userdata, font->height, str, len);
}

NK_INTERN void
nk_textedit_layout_row(struct nk_text_edit_row *r, struct nk_text_edit *edit,
    int line_start_id, float row_height, const struct nk_user_font *font)
{
    int l;
    int glyphs = 0;
    nk_rune unicode;
    const char *remaining;
    int len = nk_str_len_char(&edit->string);
    const char *end = nk_str_get_const(&edit->string) + len;
    const char *text = nk_str_at_const(&edit->string, line_start_id, &unicode, &l);
    const struct nk_vec2 size = nk_text_calculate_text_bounds(font,
        text, (int)(end - text), row_height, &remaining, 0, &glyphs, NK_STOP_ON_NEW_LINE);

    r->x0 = 0.0f;
    r->x1 = size.x;
    r->baseline_y_delta = size.y;
    r->ymin = 0.0f;
    r->ymax = size.y;
    r->num_chars = glyphs;
}

NK_INTERN int
nk_textedit_locate_coord(struct nk_text_edit *edit, float x, float y,
    const struct nk_user_font *font, float row_height)
{
    struct nk_text_edit_row r;
    int n = edit->string.len;
    float base_y = 0, prev_x;
    int i=0, k;

    r.x0 = r.x1 = 0;
    r.ymin = r.ymax = 0;
    r.num_chars = 0;

    /* search rows to find one that straddles 'y' */
    while (i < n) {
        nk_textedit_layout_row(&r, edit, i, row_height, font);
        if (r.num_chars <= 0)
            return n;

        if (i==0 && y < base_y + r.ymin)
            return 0;

        if (y < base_y + r.ymax)
            break;

        i += r.num_chars;
        base_y += r.baseline_y_delta;
    }

    /* below all text, return 'after' last character */
    if (i >= n)
        return n;

    /* check if it's before the beginning of the line */
    if (x < r.x0)
        return i;

    /* check if it's before the end of the line */
    if (x < r.x1) {
        /* search characters in row for one that straddles 'x' */
        k = i;
        prev_x = r.x0;
        for (i=0; i < r.num_chars; ++i) {
            float w = nk_textedit_get_width(edit, k, i, font);
            if (x < prev_x+w) {
                if (x < prev_x+w/2)
                    return k+i;
                else return k+i+1;
            }
            prev_x += w;
        }
        /* shouldn't happen, but if it does, fall through to end-of-line case */
    }

    /* if the last character is a newline, return that.
     * otherwise return 'after' the last character */
    if (nk_str_rune_at(&edit->string, i+r.num_chars-1) == '\n')
        return i+r.num_chars-1;
    else return i+r.num_chars;
}

NK_INTERN void
nk_textedit_click(struct nk_text_edit *state, float x, float y,
    const struct nk_user_font *font, float row_height)
{
    /* API click: on mouse down, move the cursor to the clicked location,
     * and reset the selection */
    state->cursor = nk_textedit_locate_coord(state, x, y, font, row_height);
    state->select_start = state->cursor;
    state->select_end = state->cursor;
    state->has_preferred_x = 0;
}

NK_INTERN void
nk_textedit_drag(struct nk_text_edit *state, float x, float y,
    const struct nk_user_font *font, float row_height)
{
    /* API drag: on mouse drag, move the cursor and selection endpoint
     * to the clicked location */
    int p = nk_textedit_locate_coord(state, x, y, font, row_height);
    if (state->select_start == state->select_end)
        state->select_start = state->cursor;
    state->cursor = state->select_end = p;
}

NK_INTERN void
nk_textedit_find_charpos(struct nk_text_find *find, struct nk_text_edit *state,
    int n, int single_line, const struct nk_user_font *font, float row_height)
{
    /* find the x/y location of a character, and remember info about the previous
     * row in case we get a move-up event (for page up, we'll have to rescan) */
    struct nk_text_edit_row r;
    int prev_start = 0;
    int z = state->string.len;
    int i=0, first;

    nk_zero_struct(r);
    if (n == z) {
        /* if it's at the end, then find the last line -- simpler than trying to
        explicitly handle this case in the regular code */
        nk_textedit_layout_row(&r, state, 0, row_height, font);
        if (single_line) {
            find->first_char = 0;
            find->length = z;
        } else {
            while (i < z) {
                prev_start = i;
                i += r.num_chars;
                nk_textedit_layout_row(&r, state, i, row_height, font);
            }

            find->first_char = i;
            find->length = r.num_chars;
        }
        find->x = r.x1;
        find->y = r.ymin;
        find->height = r.ymax - r.ymin;
        find->prev_first = prev_start;
        return;
    }

    /* search rows to find the one that straddles character n */
    find->y = 0;

    for(;;) {
        nk_textedit_layout_row(&r, state, i, row_height, font);
        if (n < i + r.num_chars) break;
        prev_start = i;
        i += r.num_chars;
        find->y += r.baseline_y_delta;
    }

    find->first_char = first = i;
    find->length = r.num_chars;
    find->height = r.ymax - r.ymin;
    find->prev_first = prev_start;

    /* now scan to find xpos */
    find->x = r.x0;
    for (i=0; first+i < n; ++i)
        find->x += nk_textedit_get_width(state, first, i, font);
}

NK_INTERN void
nk_textedit_clamp(struct nk_text_edit *state)
{
    /* make the selection/cursor state valid if client altered the string */
    int n = state->string.len;
    if (NK_TEXT_HAS_SELECTION(state)) {
        if (state->select_start > n) state->select_start = n;
        if (state->select_end   > n) state->select_end = n;
        /* if clamping forced them to be equal, move the cursor to match */
        if (state->select_start == state->select_end)
            state->cursor = state->select_start;
    }
    if (state->cursor > n) state->cursor = n;
}

NK_API void
nk_textedit_delete(struct nk_text_edit *state, int where, int len)
{
    /* delete characters while updating undo */
    nk_textedit_makeundo_delete(state, where, len);
    nk_str_delete_runes(&state->string, where, len);
    state->has_preferred_x = 0;
}

NK_API void
nk_textedit_delete_selection(struct nk_text_edit *state)
{
    /* delete the section */
    nk_textedit_clamp(state);
    if (NK_TEXT_HAS_SELECTION(state)) {
        if (state->select_start < state->select_end) {
            nk_textedit_delete(state, state->select_start,
                state->select_end - state->select_start);
            state->select_end = state->cursor = state->select_start;
        } else {
            nk_textedit_delete(state, state->select_end,
                state->select_start - state->select_end);
            state->select_start = state->cursor = state->select_end;
        }
        state->has_preferred_x = 0;
    }
}

NK_INTERN void
nk_textedit_sortselection(struct nk_text_edit *state)
{
    /* canonicalize the selection so start <= end */
    if (state->select_end < state->select_start) {
        int temp = state->select_end;
        state->select_end = state->select_start;
        state->select_start = temp;
    }
}

NK_INTERN void
nk_textedit_move_to_first(struct nk_text_edit *state)
{
    /* move cursor to first character of selection */
    if (NK_TEXT_HAS_SELECTION(state)) {
        nk_textedit_sortselection(state);
        state->cursor = state->select_start;
        state->select_end = state->select_start;
        state->has_preferred_x = 0;
    }
}

NK_INTERN void
nk_textedit_move_to_last(struct nk_text_edit *state)
{
    /* move cursor to last character of selection */
    if (NK_TEXT_HAS_SELECTION(state)) {
        nk_textedit_sortselection(state);
        nk_textedit_clamp(state);
        state->cursor = state->select_end;
        state->select_start = state->select_end;
        state->has_preferred_x = 0;
    }
}

NK_INTERN int
nk_is_word_boundary( struct nk_text_edit *state, int idx)
{
    int len;
    nk_rune c;
    if (idx <= 0) return 1;
    if (!nk_str_at_rune(&state->string, idx, &c, &len)) return 1;
    return (c == ' ' || c == '\t' ||c == 0x3000 || c == ',' || c == ';' ||
            c == '(' || c == ')' || c == '{' || c == '}' || c == '[' || c == ']' ||
            c == '|');
}

NK_INTERN int
nk_textedit_move_to_word_previous(struct nk_text_edit *state)
{
   int c = state->cursor - 1;
   while( c >= 0 && !nk_is_word_boundary(state, c))
      --c;

   if( c < 0 )
      c = 0;

   return c;
}

NK_INTERN int
nk_textedit_move_to_word_next(struct nk_text_edit *state)
{
   const int len = state->string.len;
   int c = state->cursor+1;
   while( c < len && !nk_is_word_boundary(state, c))
      ++c;

   if( c > len )
      c = len;

   return c;
}

NK_INTERN void
nk_textedit_prep_selection_at_cursor(struct nk_text_edit *state)
{
    /* update selection and cursor to match each other */
    if (!NK_TEXT_HAS_SELECTION(state))
        state->select_start = state->select_end = state->cursor;
    else state->cursor = state->select_end;
}

NK_API int
nk_textedit_cut(struct nk_text_edit *state)
{
    /* API cut: delete selection */
    if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
        return 0;
    if (NK_TEXT_HAS_SELECTION(state)) {
        nk_textedit_delete_selection(state); /* implicitly clamps */
        state->has_preferred_x = 0;
        return 1;
    }
   return 0;
}

NK_API int
nk_textedit_paste(struct nk_text_edit *state, char const *ctext, int len)
{
    /* API paste: replace existing selection with passed-in text */
    int glyphs;
    const char *text = (const char *) ctext;
    if (state->mode == NK_TEXT_EDIT_MODE_VIEW) return 0;

    /* if there's a selection, the paste should delete it */
    nk_textedit_clamp(state);
    nk_textedit_delete_selection(state);

    /* try to insert the characters */
    glyphs = nk_utf_len(ctext, len);
    if (nk_str_insert_text_char(&state->string, state->cursor, text, len)) {
        nk_textedit_makeundo_insert(state, state->cursor, glyphs);
        state->cursor += len;
        state->has_preferred_x = 0;
        return 1;
    }
    /* remove the undo since we didn't actually insert the characters */
    if (state->undo.undo_point)
        --state->undo.undo_point;
    return 0;
}

NK_API void
nk_textedit_text(struct nk_text_edit *state, const char *text, int total_len)
{
    nk_rune unicode;
    int glyph_len;
    int text_len = 0;

    NK_ASSERT(state);
    NK_ASSERT(text);
    if (!text || !total_len || state->mode == NK_TEXT_EDIT_MODE_VIEW) return;

    glyph_len = nk_utf_decode(text, &unicode, total_len);
    while ((text_len < total_len) && glyph_len)
    {
        /* don't insert a backward delete, just process the event */
        if (unicode == 127) goto next;
        /* can't add newline in single-line mode */
        if (unicode == '\n' && state->single_line) goto next;
        /* filter incoming text */
        if (state->filter && !state->filter(state, unicode)) goto next;

        if (!NK_TEXT_HAS_SELECTION(state) &&
            state->cursor < state->string.len)
        {
            if (state->mode == NK_TEXT_EDIT_MODE_REPLACE) {
                nk_textedit_makeundo_replace(state, state->cursor, 1, 1);
                nk_str_delete_runes(&state->string, state->cursor, 1);
            }
            if (nk_str_insert_text_utf8(&state->string, state->cursor,
                                        text+text_len, 1))
            {
                ++state->cursor;
                state->has_preferred_x = 0;
            }
        } else {
            nk_textedit_delete_selection(state); /* implicitly clamps */
            if (nk_str_insert_text_utf8(&state->string, state->cursor,
                                        text+text_len, 1))
            {
                nk_textedit_makeundo_insert(state, state->cursor, 1);
                ++state->cursor;
                state->has_preferred_x = 0;
            }
        }
        next:
        text_len += glyph_len;
        glyph_len = nk_utf_decode(text + text_len, &unicode, total_len-text_len);
    }
}

NK_INTERN void
nk_textedit_key(struct nk_text_edit *state, enum nk_keys key, int shift_mod,
    const struct nk_user_font *font, float row_height)
{
retry:
    switch (key)
    {
    case NK_KEY_NONE:
    case NK_KEY_CTRL:
    case NK_KEY_ENTER:
    case NK_KEY_SHIFT:
    case NK_KEY_TAB:
    case NK_KEY_COPY:
    case NK_KEY_CUT:
    case NK_KEY_PASTE:
    case NK_KEY_MAX:
    default: break;
    case NK_KEY_TEXT_UNDO:
         nk_textedit_undo(state);
         state->has_preferred_x = 0;
         break;

    case NK_KEY_TEXT_REDO:
        nk_textedit_redo(state);
        state->has_preferred_x = 0;
        break;

    case NK_KEY_TEXT_SELECT_ALL:
        nk_textedit_select_all(state);
        state->has_preferred_x = 0;
        break;

    case NK_KEY_TEXT_INSERT_MODE:
        if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
            state->mode = NK_TEXT_EDIT_MODE_INSERT;
        break;
    case NK_KEY_TEXT_REPLACE_MODE:
        if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
            state->mode = NK_TEXT_EDIT_MODE_REPLACE;
        break;
    case NK_KEY_TEXT_RESET_MODE:
        if (state->mode == NK_TEXT_EDIT_MODE_INSERT ||
            state->mode == NK_TEXT_EDIT_MODE_REPLACE)
            state->mode = NK_TEXT_EDIT_MODE_VIEW;
        break;

    case NK_KEY_LEFT:
        if (shift_mod) {
            nk_textedit_clamp(state);
            nk_textedit_prep_selection_at_cursor(state);
            /* move selection left */
            if (state->select_end > 0)
                --state->select_end;
            state->cursor = state->select_end;
            state->has_preferred_x = 0;
        } else {
            /* if currently there's a selection,
             * move cursor to start of selection */
            if (NK_TEXT_HAS_SELECTION(state))
                nk_textedit_move_to_first(state);
            else if (state->cursor > 0)
               --state->cursor;
            state->has_preferred_x = 0;
        } break;

    case NK_KEY_RIGHT:
        if (shift_mod) {
            nk_textedit_prep_selection_at_cursor(state);
            /* move selection right */
            ++state->select_end;
            nk_textedit_clamp(state);
            state->cursor = state->select_end;
            state->has_preferred_x = 0;
        } else {
            /* if currently there's a selection,
             * move cursor to end of selection */
            if (NK_TEXT_HAS_SELECTION(state))
                nk_textedit_move_to_last(state);
            else ++state->cursor;
            nk_textedit_clamp(state);
            state->has_preferred_x = 0;
        } break;

    case NK_KEY_TEXT_WORD_LEFT:
        if (shift_mod) {
            if( !NK_TEXT_HAS_SELECTION( state ) )
            nk_textedit_prep_selection_at_cursor(state);
            state->cursor = nk_textedit_move_to_word_previous(state);
            state->select_end = state->cursor;
            nk_textedit_clamp(state );
        } else {
            if (NK_TEXT_HAS_SELECTION(state))
                nk_textedit_move_to_first(state);
            else {
                state->cursor = nk_textedit_move_to_word_previous(state);
                nk_textedit_clamp(state );
            }
        } break;

    case NK_KEY_TEXT_WORD_RIGHT:
        if (shift_mod) {
            if( !NK_TEXT_HAS_SELECTION( state ) )
                nk_textedit_prep_selection_at_cursor(state);
            state->cursor = nk_textedit_move_to_word_next(state);
            state->select_end = state->cursor;
            nk_textedit_clamp(state);
        } else {
            if (NK_TEXT_HAS_SELECTION(state))
                nk_textedit_move_to_last(state);
            else {
                state->cursor = nk_textedit_move_to_word_next(state);
                nk_textedit_clamp(state );
            }
        } break;

    case NK_KEY_DOWN: {
        struct nk_text_find find;
        struct nk_text_edit_row row;
        int i, sel = shift_mod;

        if (state->single_line) {
            /* on windows, up&down in single-line behave like left&right */
            key = NK_KEY_RIGHT;
            goto retry;
        }

        if (sel)
            nk_textedit_prep_selection_at_cursor(state);
        else if (NK_TEXT_HAS_SELECTION(state))
            nk_textedit_move_to_last(state);

        /* compute current position of cursor point */
        nk_textedit_clamp(state);
        nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
            font, row_height);

        /* now find character position down a row */
        if (find.length)
        {
            float x;
            float goal_x = state->has_preferred_x ? state->preferred_x : find.x;
            int start = find.first_char + find.length;

            state->cursor = start;
            nk_textedit_layout_row(&row, state, state->cursor, row_height, font);
            x = row.x0;

            for (i=0; i < row.num_chars && x < row.x1; ++i) {
                float dx = nk_textedit_get_width(state, start, i, font);
                x += dx;
                if (x > goal_x)
                    break;
                ++state->cursor;
            }
            nk_textedit_clamp(state);

            state->has_preferred_x = 1;
            state->preferred_x = goal_x;
            if (sel)
                state->select_end = state->cursor;
        }
    } break;

    case NK_KEY_UP: {
        struct nk_text_find find;
        struct nk_text_edit_row row;
        int i, sel = shift_mod;

        if (state->single_line) {
            /* on windows, up&down become left&right */
            key = NK_KEY_LEFT;
            goto retry;
        }

        if (sel)
            nk_textedit_prep_selection_at_cursor(state);
        else if (NK_TEXT_HAS_SELECTION(state))
            nk_textedit_move_to_first(state);

         /* compute current position of cursor point */
         nk_textedit_clamp(state);
         nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
                font, row_height);

         /* can only go up if there's a previous row */
         if (find.prev_first != find.first_char) {
            /* now find character position up a row */
            float x;
            float goal_x = state->has_preferred_x ? state->preferred_x : find.x;

            state->cursor = find.prev_first;
            nk_textedit_layout_row(&row, state, state->cursor, row_height, font);
            x = row.x0;

            for (i=0; i < row.num_chars && x < row.x1; ++i) {
                float dx = nk_textedit_get_width(state, find.prev_first, i, font);
                x += dx;
                if (x > goal_x)
                    break;
                ++state->cursor;
            }
            nk_textedit_clamp(state);

            state->has_preferred_x = 1;
            state->preferred_x = goal_x;
            if (sel) state->select_end = state->cursor;
         }
      } break;

    case NK_KEY_DEL:
        if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
            break;
        if (NK_TEXT_HAS_SELECTION(state))
            nk_textedit_delete_selection(state);
        else {
            int n = state->string.len;
            if (state->cursor < n)
                nk_textedit_delete(state, state->cursor, 1);
         }
         state->has_preferred_x = 0;
         break;

    case NK_KEY_BACKSPACE:
        if (state->mode == NK_TEXT_EDIT_MODE_VIEW)
            break;
        if (NK_TEXT_HAS_SELECTION(state))
            nk_textedit_delete_selection(state);
        else {
            nk_textedit_clamp(state);
            if (state->cursor > 0) {
                nk_textedit_delete(state, state->cursor-1, 1);
                --state->cursor;
            }
         }
         state->has_preferred_x = 0;
         break;

    case NK_KEY_TEXT_START:
         if (shift_mod) {
            nk_textedit_prep_selection_at_cursor(state);
            state->cursor = state->select_end = 0;
            state->has_preferred_x = 0;
         } else {
            state->cursor = state->select_start = state->select_end = 0;
            state->has_preferred_x = 0;
         }
         break;

    case NK_KEY_TEXT_END:
         if (shift_mod) {
            nk_textedit_prep_selection_at_cursor(state);
            state->cursor = state->select_end = state->string.len;
            state->has_preferred_x = 0;
         } else {
            state->cursor = state->string.len;
            state->select_start = state->select_end = 0;
            state->has_preferred_x = 0;
         }
         break;

    case NK_KEY_TEXT_LINE_START: {
        if (shift_mod) {
            struct nk_text_find find;
           nk_textedit_clamp(state);
            nk_textedit_prep_selection_at_cursor(state);
            if (state->string.len && state->cursor == state->string.len)
                --state->cursor;
            nk_textedit_find_charpos(&find, state,state->cursor, state->single_line,
                font, row_height);
            state->cursor = state->select_end = find.first_char;
            state->has_preferred_x = 0;
        } else {
            struct nk_text_find find;
            if (state->string.len && state->cursor == state->string.len)
                --state->cursor;
            nk_textedit_clamp(state);
            nk_textedit_move_to_first(state);
            nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
                font, row_height);
            state->cursor = find.first_char;
            state->has_preferred_x = 0;
        }
      } break;

    case NK_KEY_TEXT_LINE_END: {
        if (shift_mod) {
            struct nk_text_find find;
            nk_textedit_clamp(state);
            nk_textedit_prep_selection_at_cursor(state);
            nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
                font, row_height);
            state->has_preferred_x = 0;
            state->cursor = find.first_char + find.length;
            if (find.length > 0 && nk_str_rune_at(&state->string, state->cursor-1) == '\n')
                --state->cursor;
            state->select_end = state->cursor;
        } else {
            struct nk_text_find find;
            nk_textedit_clamp(state);
            nk_textedit_move_to_first(state);
            nk_textedit_find_charpos(&find, state, state->cursor, state->single_line,
                font, row_height);

            state->has_preferred_x = 0;
            state->cursor = find.first_char + find.length;
            if (find.length > 0 && nk_str_rune_at(&state->string, state->cursor-1) == '\n')
                --state->cursor;
        }} break;
    }
}

NK_INTERN void
nk_textedit_flush_redo(struct nk_text_undo_state *state)
{
    state->redo_point = NK_TEXTEDIT_UNDOSTATECOUNT;
    state->redo_char_point = NK_TEXTEDIT_UNDOCHARCOUNT;
}

NK_INTERN void
nk_textedit_discard_undo(struct nk_text_undo_state *state)
{
    /* discard the oldest entry in the undo list */
    if (state->undo_point > 0) {
        /* if the 0th undo state has characters, clean those up */
        if (state->undo_rec[0].char_storage >= 0) {
            int n = state->undo_rec[0].insert_length, i;
            /* delete n characters from all other records */
            state->undo_char_point = (short)(state->undo_char_point - n);
            NK_MEMCPY(state->undo_char, state->undo_char + n,
                (nk_size)state->undo_char_point*sizeof(nk_rune));
            for (i=0; i < state->undo_point; ++i) {
                if (state->undo_rec[i].char_storage >= 0)
                state->undo_rec[i].char_storage = (short)
                    (state->undo_rec[i].char_storage - n);
            }
        }
        --state->undo_point;
        NK_MEMCPY(state->undo_rec, state->undo_rec+1,
            (nk_size)((nk_size)state->undo_point * sizeof(state->undo_rec[0])));
    }
}

NK_INTERN void
nk_textedit_discard_redo(struct nk_text_undo_state *state)
{
/*  discard the oldest entry in the redo list--it's bad if this
    ever happens, but because undo & redo have to store the actual
    characters in different cases, the redo character buffer can
    fill up even though the undo buffer didn't */
    nk_size num;
    int k = NK_TEXTEDIT_UNDOSTATECOUNT-1;
    if (state->redo_point <= k) {
        /* if the k'th undo state has characters, clean those up */
        if (state->undo_rec[k].char_storage >= 0) {
            int n = state->undo_rec[k].insert_length, i;
            /* delete n characters from all other records */
            state->redo_char_point = (short)(state->redo_char_point + n);
            num = (nk_size)(NK_TEXTEDIT_UNDOCHARCOUNT - state->redo_char_point);
            NK_MEMCPY(state->undo_char + state->redo_char_point,
                state->undo_char + state->redo_char_point-n, num * sizeof(char));
            for (i = state->redo_point; i < k; ++i) {
                if (state->undo_rec[i].char_storage >= 0) {
                    state->undo_rec[i].char_storage = (short)
                        (state->undo_rec[i].char_storage + n);
                }
            }
        }
        ++state->redo_point;
        num = (nk_size)(NK_TEXTEDIT_UNDOSTATECOUNT - state->redo_point);
        if (num) NK_MEMCPY(state->undo_rec + state->redo_point-1,
            state->undo_rec + state->redo_point, num * sizeof(state->undo_rec[0]));
    }
}

NK_INTERN struct nk_text_undo_record*
nk_textedit_create_undo_record(struct nk_text_undo_state *state, int numchars)
{
    /* any time we create a new undo record, we discard redo*/
    nk_textedit_flush_redo(state);

    /* if we have no free records, we have to make room,
     * by sliding the existing records down */
    if (state->undo_point == NK_TEXTEDIT_UNDOSTATECOUNT)
        nk_textedit_discard_undo(state);

    /* if the characters to store won't possibly fit in the buffer,
     * we can't undo */
    if (numchars > NK_TEXTEDIT_UNDOCHARCOUNT) {
        state->undo_point = 0;
        state->undo_char_point = 0;
        return 0;
    }

    /* if we don't have enough free characters in the buffer,
     * we have to make room */
    while (state->undo_char_point + numchars > NK_TEXTEDIT_UNDOCHARCOUNT)
        nk_textedit_discard_undo(state);
    return &state->undo_rec[state->undo_point++];
}

NK_INTERN nk_rune*
nk_textedit_createundo(struct nk_text_undo_state *state, int pos,
    int insert_len, int delete_len)
{
    struct nk_text_undo_record *r = nk_textedit_create_undo_record(state, insert_len);
    if (r == 0)
        return 0;

    r->where = pos;
    r->insert_length = (short) insert_len;
    r->delete_length = (short) delete_len;

    if (insert_len == 0) {
        r->char_storage = -1;
        return 0;
    } else {
        r->char_storage = state->undo_char_point;
        state->undo_char_point = (short)(state->undo_char_point +  insert_len);
        return &state->undo_char[r->char_storage];
    }
}

NK_API void
nk_textedit_undo(struct nk_text_edit *state)
{
    struct nk_text_undo_state *s = &state->undo;
    struct nk_text_undo_record u, *r;
    if (s->undo_point == 0)
        return;

    /* we need to do two things: apply the undo record, and create a redo record */
    u = s->undo_rec[s->undo_point-1];
    r = &s->undo_rec[s->redo_point-1];
    r->char_storage = -1;

    r->insert_length = u.delete_length;
    r->delete_length = u.insert_length;
    r->where = u.where;

    if (u.delete_length)
    {
       /*   if the undo record says to delete characters, then the redo record will
            need to re-insert the characters that get deleted, so we need to store
            them.
            there are three cases:
                - there's enough room to store the characters
                - characters stored for *redoing* don't leave room for redo
                - characters stored for *undoing* don't leave room for redo
            if the last is true, we have to bail */
        if (s->undo_char_point + u.delete_length >= NK_TEXTEDIT_UNDOCHARCOUNT) {
            /* the undo records take up too much character space; there's no space
            * to store the redo characters */
            r->insert_length = 0;
        } else {
            int i;
            /* there's definitely room to store the characters eventually */
            while (s->undo_char_point + u.delete_length > s->redo_char_point) {
                /* there's currently not enough room, so discard a redo record */
                nk_textedit_discard_redo(s);
                /* should never happen: */
                if (s->redo_point == NK_TEXTEDIT_UNDOSTATECOUNT)
                    return;
            }

            r = &s->undo_rec[s->redo_point-1];
            r->char_storage = (short)(s->redo_char_point - u.delete_length);
            s->redo_char_point = (short)(s->redo_char_point -  u.delete_length);

            /* now save the characters */
            for (i=0; i < u.delete_length; ++i)
                s->undo_char[r->char_storage + i] =
                    nk_str_rune_at(&state->string, u.where + i);
        }
        /* now we can carry out the deletion */
        nk_str_delete_runes(&state->string, u.where, u.delete_length);
    }

    /* check type of recorded action: */
    if (u.insert_length) {
        /* easy case: was a deletion, so we need to insert n characters */
        nk_str_insert_text_runes(&state->string, u.where,
            &s->undo_char[u.char_storage], u.insert_length);
        s->undo_char_point = (short)(s->undo_char_point - u.insert_length);
    }
    state->cursor = (short)(u.where + u.insert_length);

    s->undo_point--;
    s->redo_point--;
}

NK_API void
nk_textedit_redo(struct nk_text_edit *state)
{
    struct nk_text_undo_state *s = &state->undo;
    struct nk_text_undo_record *u, r;
    if (s->redo_point == NK_TEXTEDIT_UNDOSTATECOUNT)
        return;

    /* we need to do two things: apply the redo record, and create an undo record */
    u = &s->undo_rec[s->undo_point];
    r = s->undo_rec[s->redo_point];

    /* we KNOW there must be room for the undo record, because the redo record
    was derived from an undo record */
    u->delete_length = r.insert_length;
    u->insert_length = r.delete_length;
    u->where = r.where;
    u->char_storage = -1;

    if (r.delete_length) {
        /* the redo record requires us to delete characters, so the undo record
        needs to store the characters */
        if (s->undo_char_point + u->insert_length > s->redo_char_point) {
            u->insert_length = 0;
            u->delete_length = 0;
        } else {
            int i;
            u->char_storage = s->undo_char_point;
            s->undo_char_point = (short)(s->undo_char_point + u->insert_length);

            /* now save the characters */
            for (i=0; i < u->insert_length; ++i) {
                s->undo_char[u->char_storage + i] =
                    nk_str_rune_at(&state->string, u->where + i);
            }
        }
        nk_str_delete_runes(&state->string, r.where, r.delete_length);
    }

    if (r.insert_length) {
        /* easy case: need to insert n characters */
        nk_str_insert_text_runes(&state->string, r.where,
            &s->undo_char[r.char_storage], r.insert_length);
    }
    state->cursor = r.where + r.insert_length;

    s->undo_point++;
    s->redo_point++;
}

NK_INTERN void
nk_textedit_makeundo_insert(struct nk_text_edit *state, int where, int length)
{
    nk_textedit_createundo(&state->undo, where, 0, length);
}

NK_INTERN void
nk_textedit_makeundo_delete(struct nk_text_edit *state, int where, int length)
{
    int i;
    nk_rune *p = nk_textedit_createundo(&state->undo, where, length, 0);
    if (p) {
        for (i=0; i < length; ++i)
            p[i] = nk_str_rune_at(&state->string, where+i);
    }
}

NK_INTERN void
nk_textedit_makeundo_replace(struct nk_text_edit *state, int where,
    int old_length, int new_length)
{
    int i;
    nk_rune *p = nk_textedit_createundo(&state->undo, where, old_length, new_length);
    if (p) {
        for (i=0; i < old_length; ++i)
            p[i] = nk_str_rune_at(&state->string, where+i);
    }
}

NK_INTERN void
nk_textedit_clear_state(struct nk_text_edit *state, enum nk_text_edit_type type,
    nk_plugin_filter filter)
{
    /* reset the state to default */
   state->undo.undo_point = 0;
   state->undo.undo_char_point = 0;
   state->undo.redo_point = NK_TEXTEDIT_UNDOSTATECOUNT;
   state->undo.redo_char_point = NK_TEXTEDIT_UNDOCHARCOUNT;
   state->select_end = state->select_start = 0;
   state->cursor = 0;
   state->has_preferred_x = 0;
   state->preferred_x = 0;
   state->cursor_at_end_of_line = 0;
   state->initialized = 1;
   state->single_line = (unsigned char)(type == NK_TEXT_EDIT_SINGLE_LINE);
   state->mode = NK_TEXT_EDIT_MODE_VIEW;
   state->filter = filter;
   state->scrollbar = nk_vec2(0,0);
}

NK_API void
nk_textedit_init_fixed(struct nk_text_edit *state, void *memory, nk_size size)
{
    NK_ASSERT(state);
    NK_ASSERT(memory);
    if (!state || !memory || !size) return;
    NK_MEMSET(state, 0, sizeof(struct nk_text_edit));
    nk_textedit_clear_state(state, NK_TEXT_EDIT_SINGLE_LINE, 0);
    nk_str_init_fixed(&state->string, memory, size);
}

NK_API void
nk_textedit_init(struct nk_text_edit *state, struct nk_allocator *alloc, nk_size size)
{
    NK_ASSERT(state);
    NK_ASSERT(alloc);
    if (!state || !alloc) return;
    NK_MEMSET(state, 0, sizeof(struct nk_text_edit));
    nk_textedit_clear_state(state, NK_TEXT_EDIT_SINGLE_LINE, 0);
    nk_str_init(&state->string, alloc, size);
}

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API void
nk_textedit_init_default(struct nk_text_edit *state)
{
    NK_ASSERT(state);
    if (!state) return;
    NK_MEMSET(state, 0, sizeof(struct nk_text_edit));
    nk_textedit_clear_state(state, NK_TEXT_EDIT_SINGLE_LINE, 0);
    nk_str_init_default(&state->string);
}
#endif

NK_API void
nk_textedit_select_all(struct nk_text_edit *state)
{
    NK_ASSERT(state);
    state->select_start = 0;
    state->select_end = state->string.len;
}

NK_API void
nk_textedit_free(struct nk_text_edit *state)
{
    NK_ASSERT(state);
    if (!state) return;
    nk_str_free(&state->string);
}

/* ===============================================================
 *
 *                          TEXT WIDGET
 *
 * ===============================================================*/
#define nk_widget_state_reset(s)\
    if ((*(s)) & NK_WIDGET_STATE_MODIFIED)\
        (*(s)) = NK_WIDGET_STATE_INACTIVE|NK_WIDGET_STATE_MODIFIED;\
    else (*(s)) = NK_WIDGET_STATE_INACTIVE;

struct nk_text {
    struct nk_vec2 padding;
    struct nk_color background;
    struct nk_color text;
};

NK_INTERN void
nk_widget_text(struct nk_command_buffer *o, struct nk_rect b,
    const char *string, int len, const struct nk_text *t,
    nk_flags a, const struct nk_user_font *f)
{
    struct nk_rect label;
    float text_width;

    NK_ASSERT(o);
    NK_ASSERT(t);
    if (!o || !t) return;

    b.h = NK_MAX(b.h, 2 * t->padding.y);
    label.x = 0; label.w = 0;
    label.y = b.y + t->padding.y;
    label.h = NK_MIN(f->height, b.h - 2 * t->padding.y);

    text_width = f->width(f->userdata, f->height, (const char*)string, len);
    text_width += (2.0f * t->padding.x);

    /* align in x-axis */
    if (a & NK_TEXT_ALIGN_LEFT) {
        label.x = b.x + t->padding.x;
        label.w = NK_MAX(0, b.w - 2 * t->padding.x);
    } else if (a & NK_TEXT_ALIGN_CENTERED) {
        label.w = NK_MAX(1, 2 * t->padding.x + (float)text_width);
        label.x = (b.x + t->padding.x + ((b.w - 2 * t->padding.x) - label.w) / 2);
        label.x = NK_MAX(b.x + t->padding.x, label.x);
        label.w = NK_MIN(b.x + b.w, label.x + label.w);
        if (label.w >= label.x) label.w -= label.x;
    } else if (a & NK_TEXT_ALIGN_RIGHT) {
        label.x = NK_MAX(b.x + t->padding.x, (b.x + b.w) - (2 * t->padding.x + (float)text_width));
        label.w = (float)text_width + 2 * t->padding.x;
    } else return;

    /* align in y-axis */
    if (a & NK_TEXT_ALIGN_MIDDLE) {
        label.y = b.y + b.h/2.0f - (float)f->height/2.0f;
        label.h = NK_MAX(b.h/2.0f, b.h - (b.h/2.0f + f->height/2.0f));
    } else if (a & NK_TEXT_ALIGN_BOTTOM) {
        label.y = b.y + b.h - f->height;
        label.h = f->height;
    }
    nk_draw_text(o, label, (const char*)string,
        len, f, t->background, t->text);
}

NK_INTERN void
nk_widget_text_wrap(struct nk_command_buffer *o, struct nk_rect b,
    const char *string, int len, const struct nk_text *t,
    const struct nk_user_font *f)
{
    float width;
    int glyphs = 0;
    int fitting = 0;
    int done = 0;
    struct nk_rect line;
    struct nk_text text;
    NK_INTERN nk_rune seperator[] = {' '};

    NK_ASSERT(o);
    NK_ASSERT(t);
    if (!o || !t) return;

    text.padding = nk_vec2(0,0);
    text.background = t->background;
    text.text = t->text;

    b.w = NK_MAX(b.w, 2 * t->padding.x);
    b.h = NK_MAX(b.h, 2 * t->padding.y);
    b.h = b.h - 2 * t->padding.y;

    line.x = b.x + t->padding.x;
    line.y = b.y + t->padding.y;
    line.w = b.w - 2 * t->padding.x;
    line.h = 2 * t->padding.y + f->height;

    fitting = nk_text_clamp(f, string, len, line.w, &glyphs, &width, seperator,NK_LEN(seperator));
    while (done < len) {
        if (!fitting || line.y + line.h >= (b.y + b.h)) break;
        nk_widget_text(o, line, &string[done], fitting, &text, NK_TEXT_LEFT, f);
        done += fitting;
        line.y += f->height + 2 * t->padding.y;
        fitting = nk_text_clamp(f, &string[done], len - done, line.w, &glyphs, &width, seperator,NK_LEN(seperator));
    }
}

/* ===============================================================
 *
 *                          BUTTON
 *
 * ===============================================================*/
NK_INTERN void
nk_draw_symbol(struct nk_command_buffer *out, enum nk_symbol_type type,
    struct nk_rect content, struct nk_color background, struct nk_color foreground,
    float border_width, const struct nk_user_font *font)
{
    switch (type) {
    case NK_SYMBOL_X:
    case NK_SYMBOL_UNDERSCORE:
    case NK_SYMBOL_PLUS:
    case NK_SYMBOL_MINUS: {
        /* single character text symbol */
        const char *X = (type == NK_SYMBOL_X) ? "x":
            (type == NK_SYMBOL_UNDERSCORE) ? "_":
            (type == NK_SYMBOL_PLUS) ? "+": "-";
        struct nk_text text;
        text.padding = nk_vec2(0,0);
        text.background = background;
        text.text = foreground;
        nk_widget_text(out, content, X, 1, &text, NK_TEXT_CENTERED, font);
    } break;
    case NK_SYMBOL_CIRCLE_SOLID:
    case NK_SYMBOL_CIRCLE_OUTLINE:
    case NK_SYMBOL_RECT_SOLID:
    case NK_SYMBOL_RECT_OUTLINE: {
        /* simple empty/filled shapes */
        if (type == NK_SYMBOL_RECT_SOLID || type == NK_SYMBOL_RECT_OUTLINE) {
            nk_fill_rect(out, content,  0, foreground);
            if (type == NK_SYMBOL_RECT_OUTLINE)
                nk_fill_rect(out, nk_shrink_rect(content, border_width), 0, background);
        } else {
            nk_fill_circle(out, content, foreground);
            if (type == NK_SYMBOL_CIRCLE_OUTLINE)
                nk_fill_circle(out, nk_shrink_rect(content, 1), background);
        }
    } break;
    case NK_SYMBOL_TRIANGLE_UP:
    case NK_SYMBOL_TRIANGLE_DOWN:
    case NK_SYMBOL_TRIANGLE_LEFT:
    case NK_SYMBOL_TRIANGLE_RIGHT: {
        enum nk_heading heading;
        struct nk_vec2 points[3];
        heading = (type == NK_SYMBOL_TRIANGLE_RIGHT) ? NK_RIGHT :
            (type == NK_SYMBOL_TRIANGLE_LEFT) ? NK_LEFT:
            (type == NK_SYMBOL_TRIANGLE_UP) ? NK_UP: NK_DOWN;
        nk_triangle_from_direction(points, content, 0, 0, heading);
        nk_fill_triangle(out, points[0].x, points[0].y, points[1].x, points[1].y,
            points[2].x, points[2].y, foreground);
    } break;
    default:
    case NK_SYMBOL_NONE:
    case NK_SYMBOL_MAX: break;
    }
}

NK_INTERN int
nk_button_behavior(nk_flags *state, struct nk_rect r,
    const struct nk_input *i, enum nk_button_behavior behavior)
{
    int ret = 0;
    nk_widget_state_reset(state);
    if (!i) return 0;
    if (nk_input_is_mouse_hovering_rect(i, r)) {
        *state = NK_WIDGET_STATE_HOVERED;
        if (nk_input_is_mouse_down(i, NK_BUTTON_LEFT))
            *state = NK_WIDGET_STATE_ACTIVE;
        if (nk_input_has_mouse_click_in_rect(i, NK_BUTTON_LEFT, r)) {
            ret = (behavior != NK_BUTTON_DEFAULT) ?
                nk_input_is_mouse_down(i, NK_BUTTON_LEFT):
#ifdef NK_BUTTON_TRIGGER_ON_RELEASE
                nk_input_is_mouse_released(i, NK_BUTTON_LEFT);
#else
                nk_input_is_mouse_pressed(i, NK_BUTTON_LEFT);
#endif
        }
    }
    if (*state & NK_WIDGET_STATE_HOVER && !nk_input_is_mouse_prev_hovering_rect(i, r))
        *state |= NK_WIDGET_STATE_ENTERED;
    else if (nk_input_is_mouse_prev_hovering_rect(i, r))
        *state |= NK_WIDGET_STATE_LEFT;
    return ret;
}

NK_INTERN const struct nk_style_item*
nk_draw_button(struct nk_command_buffer *out,
    const struct nk_rect *bounds, nk_flags state,
    const struct nk_style_button *style)
{
    const struct nk_style_item *background;
    if (state & NK_WIDGET_STATE_HOVER)
        background = &style->hover;
    else if (state & NK_WIDGET_STATE_ACTIVED)
        background = &style->active;
    else background = &style->normal;

    if (background->type == NK_STYLE_ITEM_IMAGE) {
        nk_draw_image(out, *bounds, &background->data.image, nk_white);
    } else {
        nk_fill_rect(out, *bounds, style->rounding, background->data.color);
        nk_stroke_rect(out, *bounds, style->rounding, style->border, style->border_color);
    }
    return background;
}

NK_INTERN int
nk_do_button(nk_flags *state, struct nk_command_buffer *out, struct nk_rect r,
    const struct nk_style_button *style, const struct nk_input *in,
    enum nk_button_behavior behavior, struct nk_rect *content)
{
    struct nk_rect bounds;
    NK_ASSERT(style);
    NK_ASSERT(state);
    NK_ASSERT(out);
    if (!out || !style)
        return nk_false;

    /* calculate button content space */
    content->x = r.x + style->padding.x + style->border + style->rounding;
    content->y = r.y + style->padding.y + style->border + style->rounding;
    content->w = r.w - (2 * style->padding.x + style->border + style->rounding*2);
    content->h = r.h - (2 * style->padding.y + style->border + style->rounding*2);

    /* execute button behavior */
    bounds.x = r.x - style->touch_padding.x;
    bounds.y = r.y - style->touch_padding.y;
    bounds.w = r.w + 2 * style->touch_padding.x;
    bounds.h = r.h + 2 * style->touch_padding.y;
    return nk_button_behavior(state, bounds, in, behavior);
}

NK_INTERN void
nk_draw_button_text(struct nk_command_buffer *out,
    const struct nk_rect *bounds, const struct nk_rect *content, nk_flags state,
    const struct nk_style_button *style, const char *txt, int len,
    nk_flags text_alignment, const struct nk_user_font *font)
{
    struct nk_text text;
    const struct nk_style_item *background;
    background = nk_draw_button(out, bounds, state, style);

    /* select correct colors/images */
    if (background->type == NK_STYLE_ITEM_COLOR)
        text.background = background->data.color;
    else text.background = style->text_background;
    if (state & NK_WIDGET_STATE_HOVER)
        text.text = style->text_hover;
    else if (state & NK_WIDGET_STATE_ACTIVED)
        text.text = style->text_active;
    else text.text = style->text_normal;

    text.padding = nk_vec2(0,0);
    nk_widget_text(out, *content, txt, len, &text, text_alignment, font);
}

NK_INTERN int
nk_do_button_text(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect bounds,
    const char *string, int len, nk_flags align, enum nk_button_behavior behavior,
    const struct nk_style_button *style, const struct nk_input *in,
    const struct nk_user_font *font)
{
    struct nk_rect content;
    int ret = nk_false;

    NK_ASSERT(state);
    NK_ASSERT(style);
    NK_ASSERT(out);
    NK_ASSERT(string);
    NK_ASSERT(font);
    if (!out || !style || !font || !string)
        return nk_false;

    ret = nk_do_button(state, out, bounds, style, in, behavior, &content);
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_button_text(out, &bounds, &content, *state, style, string, len, align, font);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return ret;
}

NK_INTERN void
nk_draw_button_symbol(struct nk_command_buffer *out,
    const struct nk_rect *bounds, const struct nk_rect *content,
    nk_flags state, const struct nk_style_button *style,
    enum nk_symbol_type type, const struct nk_user_font *font)
{
    struct nk_color sym, bg;
    const struct nk_style_item *background;

    /* select correct colors/images */
    background = nk_draw_button(out, bounds, state, style);
    if (background->type == NK_STYLE_ITEM_COLOR)
        bg = background->data.color;
    else bg = style->text_background;

    if (state & NK_WIDGET_STATE_HOVER)
        sym = style->text_hover;
    else if (state & NK_WIDGET_STATE_ACTIVED)
        sym = style->text_active;
    else sym = style->text_normal;
    nk_draw_symbol(out, type, *content, bg, sym, 1, font);
}

NK_INTERN int
nk_do_button_symbol(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect bounds,
    enum nk_symbol_type symbol, enum nk_button_behavior behavior,
    const struct nk_style_button *style, const struct nk_input *in,
    const struct nk_user_font *font)
{
    int ret;
    struct nk_rect content;

    NK_ASSERT(state);
    NK_ASSERT(style);
    NK_ASSERT(font);
    NK_ASSERT(out);
    if (!out || !style || !font || !state)
        return nk_false;

    ret = nk_do_button(state, out, bounds, style, in, behavior, &content);
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_button_symbol(out, &bounds, &content, *state, style, symbol, font);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return ret;
}

NK_INTERN void
nk_draw_button_image(struct nk_command_buffer *out,
    const struct nk_rect *bounds, const struct nk_rect *content,
    nk_flags state, const struct nk_style_button *style, const struct nk_image *img)
{
    nk_draw_button(out, bounds, state, style);
    nk_draw_image(out, *content, img, nk_white);
}

NK_INTERN int
nk_do_button_image(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect bounds,
    struct nk_image img, enum nk_button_behavior b,
    const struct nk_style_button *style, const struct nk_input *in)
{
    int ret;
    struct nk_rect content;

    NK_ASSERT(state);
    NK_ASSERT(style);
    NK_ASSERT(out);
    if (!out || !style || !state)
        return nk_false;

    ret = nk_do_button(state, out, bounds, style, in, b, &content);
    content.x += style->image_padding.x;
    content.y += style->image_padding.y;
    content.w -= 2 * style->image_padding.x;
    content.h -= 2 * style->image_padding.y;

    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_button_image(out, &bounds, &content, *state, style, &img);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return ret;
}

NK_INTERN void
nk_draw_button_text_symbol(struct nk_command_buffer *out,
    const struct nk_rect *bounds, const struct nk_rect *label,
    const struct nk_rect *symbol, nk_flags state, const struct nk_style_button *style,
    const char *str, int len, enum nk_symbol_type type,
    const struct nk_user_font *font)
{
    struct nk_color sym;
    struct nk_text text;
    const struct nk_style_item *background;

    /* select correct background colors/images */
    background = nk_draw_button(out, bounds, state, style);
    if (background->type == NK_STYLE_ITEM_COLOR)
        text.background = background->data.color;
    else text.background = style->text_background;

    /* select correct text colors */
    if (state & NK_WIDGET_STATE_HOVER) {
        sym = style->text_hover;
        text.text = style->text_hover;
    } else if (state & NK_WIDGET_STATE_ACTIVED) {
        sym = style->text_active;
        text.text = style->text_active;
    } else {
        sym = style->text_normal;
        text.text = style->text_normal;
    }

    text.padding = nk_vec2(0,0);
    nk_draw_symbol(out, type, *symbol, style->text_background, sym, 0, font);
    nk_widget_text(out, *label, str, len, &text, NK_TEXT_CENTERED, font);
}

NK_INTERN int
nk_do_button_text_symbol(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect bounds,
    enum nk_symbol_type symbol, const char *str, int len, nk_flags align,
    enum nk_button_behavior behavior, const struct nk_style_button *style,
    const struct nk_user_font *font, const struct nk_input *in)
{
    int ret;
    struct nk_rect tri = {0,0,0,0};
    struct nk_rect content;

    NK_ASSERT(style);
    NK_ASSERT(out);
    NK_ASSERT(font);
    if (!out || !style || !font)
        return nk_false;

    ret = nk_do_button(state, out, bounds, style, in, behavior, &content);
    tri.y = content.y + (content.h/2) - font->height/2;
    tri.w = font->height; tri.h = font->height;
    if (align & NK_TEXT_ALIGN_LEFT) {
        tri.x = (content.x + content.w) - (2 * style->padding.x + tri.w);
        tri.x = NK_MAX(tri.x, 0);
    } else tri.x = content.x + 2 * style->padding.x;

    /* draw button */
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_button_text_symbol(out, &bounds, &content, &tri,
        *state, style, str, len, symbol, font);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return ret;
}

NK_INTERN void
nk_draw_button_text_image(struct nk_command_buffer *out,
    const struct nk_rect *bounds, const struct nk_rect *label,
    const struct nk_rect *image, nk_flags state, const struct nk_style_button *style,
    const char *str, int len, const struct nk_user_font *font,
    const struct nk_image *img)
{
    struct nk_text text;
    const struct nk_style_item *background;
    background = nk_draw_button(out, bounds, state, style);

    /* select correct colors */
    if (background->type == NK_STYLE_ITEM_COLOR)
        text.background = background->data.color;
    else text.background = style->text_background;
    if (state & NK_WIDGET_STATE_HOVER)
        text.text = style->text_hover;
    else if (state & NK_WIDGET_STATE_ACTIVED)
        text.text = style->text_active;
    else text.text = style->text_normal;

    text.padding = nk_vec2(0,0);
    nk_widget_text(out, *label, str, len, &text, NK_TEXT_CENTERED, font);
    nk_draw_image(out, *image, img, nk_white);
}

NK_INTERN int
nk_do_button_text_image(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect bounds,
    struct nk_image img, const char* str, int len, nk_flags align,
    enum nk_button_behavior behavior, const struct nk_style_button *style,
    const struct nk_user_font *font, const struct nk_input *in)
{
    int ret;
    struct nk_rect icon;
    struct nk_rect content;

    NK_ASSERT(style);
    NK_ASSERT(state);
    NK_ASSERT(font);
    NK_ASSERT(out);
    if (!out || !font || !style || !str)
        return nk_false;

    ret = nk_do_button(state, out, bounds, style, in, behavior, &content);
    icon.y = bounds.y + style->padding.y;
    icon.w = icon.h = bounds.h - 2 * style->padding.y;
    if (align & NK_TEXT_ALIGN_LEFT) {
        icon.x = (bounds.x + bounds.w) - (2 * style->padding.x + icon.w);
        icon.x = NK_MAX(icon.x, 0);
    } else icon.x = bounds.x + 2 * style->padding.x;

    icon.x += style->image_padding.x;
    icon.y += style->image_padding.y;
    icon.w -= 2 * style->image_padding.x;
    icon.h -= 2 * style->image_padding.y;

    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_button_text_image(out, &bounds, &content, &icon, *state, style, str, len, font, &img);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return ret;
}

/* ===============================================================
 *
 *                          TOGGLE
 *
 * ===============================================================*/
enum nk_toggle_type {
    NK_TOGGLE_CHECK,
    NK_TOGGLE_OPTION
};

NK_INTERN int
nk_toggle_behavior(const struct nk_input *in, struct nk_rect select,
    nk_flags *state, int active)
{
    nk_widget_state_reset(state);
    if (nk_button_behavior(state, select, in, NK_BUTTON_DEFAULT)) {
        *state = NK_WIDGET_STATE_ACTIVE;
        active = !active;
    }
    if (*state & NK_WIDGET_STATE_HOVER && !nk_input_is_mouse_prev_hovering_rect(in, select))
        *state |= NK_WIDGET_STATE_ENTERED;
    else if (nk_input_is_mouse_prev_hovering_rect(in, select))
        *state |= NK_WIDGET_STATE_LEFT;
    return active;
}

NK_INTERN void
nk_draw_checkbox(struct nk_command_buffer *out,
    nk_flags state, const struct nk_style_toggle *style, int active,
    const struct nk_rect *label, const struct nk_rect *selector,
    const struct nk_rect *cursors, const char *string, int len,
    const struct nk_user_font *font)
{
    const struct nk_style_item *background;
    const struct nk_style_item *cursor;
    struct nk_text text;

    /* select correct colors/images */
    if (state & NK_WIDGET_STATE_HOVER) {
        background = &style->hover;
        cursor = &style->cursor_hover;
        text.text = style->text_hover;
    } else if (state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->hover;
        cursor = &style->cursor_hover;
        text.text = style->text_active;
    } else {
        background = &style->normal;
        cursor = &style->cursor_normal;
        text.text = style->text_normal;
    }

    /* draw background and cursor */
    if (background->type == NK_STYLE_ITEM_COLOR) {
        nk_fill_rect(out, *selector, 0, style->border_color);
        nk_fill_rect(out, nk_shrink_rect(*selector, style->border), 0, background->data.color);
    } else nk_draw_image(out, *selector, &background->data.image, nk_white);
    if (active) {
        if (cursor->type == NK_STYLE_ITEM_IMAGE)
            nk_draw_image(out, *cursors, &cursor->data.image, nk_white);
        else nk_fill_rect(out, *cursors, 0, cursor->data.color);
    }

    text.padding.x = 0;
    text.padding.y = 0;
    text.background = style->text_background;
    nk_widget_text(out, *label, string, len, &text, NK_TEXT_LEFT, font);
}

NK_INTERN void
nk_draw_option(struct nk_command_buffer *out,
    nk_flags state, const struct nk_style_toggle *style, int active,
    const struct nk_rect *label, const struct nk_rect *selector,
    const struct nk_rect *cursors, const char *string, int len,
    const struct nk_user_font *font)
{
    const struct nk_style_item *background;
    const struct nk_style_item *cursor;
    struct nk_text text;

    /* select correct colors/images */
    if (state & NK_WIDGET_STATE_HOVER) {
        background = &style->hover;
        cursor = &style->cursor_hover;
        text.text = style->text_hover;
    } else if (state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->hover;
        cursor = &style->cursor_hover;
        text.text = style->text_active;
    } else {
        background = &style->normal;
        cursor = &style->cursor_normal;
        text.text = style->text_normal;
    }

    /* draw background and cursor */
    if (background->type == NK_STYLE_ITEM_COLOR) {
        nk_fill_circle(out, *selector, style->border_color);
        nk_fill_circle(out, nk_shrink_rect(*selector, style->border), background->data.color);
    } else nk_draw_image(out, *selector, &background->data.image, nk_white);
    if (active) {
        if (cursor->type == NK_STYLE_ITEM_IMAGE)
            nk_draw_image(out, *cursors, &cursor->data.image, nk_white);
        else nk_fill_circle(out, *cursors, cursor->data.color);
    }

    text.padding.x = 0;
    text.padding.y = 0;
    text.background = style->text_background;
    nk_widget_text(out, *label, string, len, &text, NK_TEXT_LEFT, font);
}

NK_INTERN int
nk_do_toggle(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect r,
    int *active, const char *str, int len, enum nk_toggle_type type,
    const struct nk_style_toggle *style, const struct nk_input *in,
    const struct nk_user_font *font)
{
    int was_active;
    struct nk_rect bounds;
    struct nk_rect select;
    struct nk_rect cursor;
    struct nk_rect label;

    NK_ASSERT(style);
    NK_ASSERT(out);
    NK_ASSERT(font);
    if (!out || !style || !font || !active)
        return 0;

    r.w = NK_MAX(r.w, font->height + 2 * style->padding.x);
    r.h = NK_MAX(r.h, font->height + 2 * style->padding.y);

    /* add additional touch padding for touch screen devices */
    bounds.x = r.x - style->touch_padding.x;
    bounds.y = r.y - style->touch_padding.y;
    bounds.w = r.w + 2 * style->touch_padding.x;
    bounds.h = r.h + 2 * style->touch_padding.y;

    /* calculate the selector space */
    select.w = font->height;
    select.h = select.w;
    select.y = r.y + r.h/2.0f - select.h/2.0f;
    select.x = r.x;

    /* calculate the bounds of the cursor inside the selector */
    cursor.x = select.x + style->padding.x + style->border;
    cursor.y = select.y + style->padding.y + style->border;
    cursor.w = select.w - (2 * style->padding.x + 2 * style->border);
    cursor.h = select.h - (2 * style->padding.y + 2 * style->border);

    /* label behind the selector */
    label.x = select.x + select.w + style->spacing;
    label.y = select.y;
    label.w = NK_MAX(r.x + r.w, label.x) - label.x;
    label.h = select.w;

    /* update selector */
    was_active = *active;
    *active = nk_toggle_behavior(in, bounds, state, *active);

    /* draw selector */
    if (style->draw_begin)
        style->draw_begin(out, style->userdata);
    if (type == NK_TOGGLE_CHECK) {
        nk_draw_checkbox(out, *state, style, *active, &label, &select, &cursor, str, len, font);
    } else {
        nk_draw_option(out, *state, style, *active, &label, &select, &cursor, str, len, font);
    }
    if (style->draw_end)
        style->draw_end(out, style->userdata);
    return (was_active != *active);
}

/* ===============================================================
 *
 *                          SELECTABLE
 *
 * ===============================================================*/
NK_INTERN void
nk_draw_selectable(struct nk_command_buffer *out,
    nk_flags state, const struct nk_style_selectable *style, int active,
    const struct nk_rect *bounds, const struct nk_rect *icon, const struct nk_image *img,
    const char *string, int len, nk_flags align, const struct nk_user_font *font)
{
    const struct nk_style_item *background;
    struct nk_text text;
    text.padding = style->padding;

    /* select correct colors/images */
    if (!active) {
        if (state & NK_WIDGET_STATE_ACTIVED) {
            background = &style->pressed;
            text.text = style->text_pressed;
        } else if (state & NK_WIDGET_STATE_HOVER) {
            background = &style->hover;
            text.text = style->text_hover;
        } else {
            background = &style->normal;
            text.text = style->text_normal;
        }
    } else {
        if (state & NK_WIDGET_STATE_ACTIVED) {
            background = &style->pressed_active;
            text.text = style->text_pressed_active;
        } else if (state & NK_WIDGET_STATE_HOVER) {
            background = &style->hover_active;
            text.text = style->text_hover_active;
        } else {
            background = &style->normal_active;
            text.text = style->text_normal_active;
        }
    }


    /* draw selectable background and text */
    if (background->type == NK_STYLE_ITEM_IMAGE) {
        nk_draw_image(out, *bounds, &background->data.image, nk_white);
        text.background = nk_rgba(0,0,0,0);
    } else {
        nk_fill_rect(out, *bounds, style->rounding, background->data.color);
        text.background = background->data.color;
    }
    if (img && icon) nk_draw_image(out, *icon, img, nk_white);
    nk_widget_text(out, *bounds, string, len, &text, align, font);
}

NK_INTERN int
nk_do_selectable(nk_flags *state, struct nk_command_buffer *out,
    struct nk_rect bounds, const char *str, int len, nk_flags align, int *value,
    const struct nk_style_selectable *style, const struct nk_input *in,
    const struct nk_user_font *font)
{
    int old_value;
    struct nk_rect touch;

    NK_ASSERT(state);
    NK_ASSERT(out);
    NK_ASSERT(str);
    NK_ASSERT(len);
    NK_ASSERT(value);
    NK_ASSERT(style);
    NK_ASSERT(font);

    if (!state || !out || !str || !len || !value || !style || !font) return 0;
    old_value = *value;

    /* remove padding */
    touch.x = bounds.x - style->touch_padding.x;
    touch.y = bounds.y - style->touch_padding.y;
    touch.w = bounds.w + style->touch_padding.x * 2;
    touch.h = bounds.h + style->touch_padding.y * 2;

    /* update button */
    if (nk_button_behavior(state, touch, in, NK_BUTTON_DEFAULT))
        *value = !(*value);

    /* draw selectable */
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_selectable(out, *state, style, *value, &bounds, 0,0, str, len, align, font);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return old_value != *value;
}

NK_INTERN int
nk_do_selectable_image(nk_flags *state, struct nk_command_buffer *out,
    struct nk_rect bounds, const char *str, int len, nk_flags align, int *value,
    const struct nk_image *img, const struct nk_style_selectable *style,
    const struct nk_input *in, const struct nk_user_font *font)
{
    int old_value;
    struct nk_rect touch;
    struct nk_rect icon;

    NK_ASSERT(state);
    NK_ASSERT(out);
    NK_ASSERT(str);
    NK_ASSERT(len);
    NK_ASSERT(value);
    NK_ASSERT(style);
    NK_ASSERT(font);

    if (!state || !out || !str || !len || !value || !style || !font) return 0;
    old_value = *value;

    /* toggle behavior */
    touch.x = bounds.x - style->touch_padding.x;
    touch.y = bounds.y - style->touch_padding.y;
    touch.w = bounds.w + style->touch_padding.x * 2;
    touch.h = bounds.h + style->touch_padding.y * 2;
    if (nk_button_behavior(state, touch, in, NK_BUTTON_DEFAULT))
        *value = !(*value);

    icon.y = bounds.y + style->padding.y;
    icon.w = icon.h = bounds.h - 2 * style->padding.y;
    if (align & NK_TEXT_ALIGN_LEFT) {
        icon.x = (bounds.x + bounds.w) - (2 * style->padding.x + icon.w);
        icon.x = NK_MAX(icon.x, 0);
    } else icon.x = bounds.x + 2 * style->padding.x;

    icon.x += style->image_padding.x;
    icon.y += style->image_padding.y;
    icon.w -= 2 * style->image_padding.x;
    icon.h -= 2 * style->image_padding.y;

    /* draw selectable */
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_selectable(out, *state, style, *value, &bounds, &icon, img, str, len, align, font);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return old_value != *value;
}


/* ===============================================================
 *
 *                          SLIDER
 *
 * ===============================================================*/
NK_INTERN float
nk_slider_behavior(nk_flags *state, struct nk_rect *logical_cursor,
    struct nk_rect *visual_cursor, struct nk_input *in,
    struct nk_rect bounds, float slider_min, float slider_max, float slider_value,
    float slider_step, float slider_steps)
{
    int left_mouse_down;
    int left_mouse_click_in_cursor;

    /* check if visual cursor is being dragged */
    nk_widget_state_reset(state);
    left_mouse_down = in && in->mouse.buttons[NK_BUTTON_LEFT].down;
    left_mouse_click_in_cursor = in && nk_input_has_mouse_click_down_in_rect(in,
            NK_BUTTON_LEFT, *visual_cursor, nk_true);

    if (left_mouse_down && left_mouse_click_in_cursor)
    {
        float ratio = 0;
        const float d = in->mouse.pos.x - (visual_cursor->x+visual_cursor->w*0.5f);
        const float pxstep = bounds.w / slider_steps;

        /* only update value if the next slider step is reached */
        *state = NK_WIDGET_STATE_ACTIVE;
        if (NK_ABS(d) >= pxstep) {
            const float steps = (float)((int)(NK_ABS(d) / pxstep));
            slider_value += (d > 0) ? (slider_step*steps) : -(slider_step*steps);
            slider_value = NK_CLAMP(slider_min, slider_value, slider_max);
            ratio = (slider_value - slider_min)/slider_step;
            logical_cursor->x = bounds.x + (logical_cursor->w * ratio);
            in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.x = logical_cursor->x;
        }
    }

    /* slider widget state */
    if (nk_input_is_mouse_hovering_rect(in, bounds))
        *state = NK_WIDGET_STATE_HOVERED;
    if (*state & NK_WIDGET_STATE_HOVER &&
        !nk_input_is_mouse_prev_hovering_rect(in, bounds))
        *state |= NK_WIDGET_STATE_ENTERED;
    else if (nk_input_is_mouse_prev_hovering_rect(in, bounds))
        *state |= NK_WIDGET_STATE_LEFT;
    return slider_value;
}

NK_INTERN void
nk_draw_slider(struct nk_command_buffer *out, nk_flags state,
    const struct nk_style_slider *style, const struct nk_rect *bounds,
    const struct nk_rect *visual_cursor, float min, float value, float max)
{
    struct nk_rect fill;
    struct nk_rect bar;
    const struct nk_style_item *background;

    /* select correct slider images/colors */
    struct nk_color bar_color;
    const struct nk_style_item *cursor;

    NK_UNUSED(min);
    NK_UNUSED(max);
    NK_UNUSED(value);

    if (state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->active;
        bar_color = style->bar_active;
        cursor = &style->cursor_active;
    } else if (state & NK_WIDGET_STATE_HOVER) {
        background = &style->hover;
        bar_color = style->bar_hover;
        cursor = &style->cursor_hover;
    } else {
        background = &style->normal;
        bar_color = style->bar_normal;
        cursor = &style->cursor_normal;
    }

    /* calculate slider background bar */
    bar.x = bounds->x;
    bar.y = (visual_cursor->y + visual_cursor->h/2) - bounds->h/12;
    bar.w = bounds->w;
    bar.h = bounds->h/6;

    /* filled background bar style */
    fill.w = (visual_cursor->x + (visual_cursor->w/2.0f)) - bar.x;
    fill.x = bar.x;
    fill.y = bar.y;
    fill.h = bar.h;

    /* draw background */
    if (background->type == NK_STYLE_ITEM_IMAGE) {
        nk_draw_image(out, *bounds, &background->data.image, nk_white);
    } else {
        nk_fill_rect(out, *bounds, style->rounding, background->data.color);
        nk_stroke_rect(out, *bounds, style->rounding, style->border, style->border_color);
    }

    /* draw slider bar */
    nk_fill_rect(out, bar, style->rounding, bar_color);
    nk_fill_rect(out, fill, style->rounding, style->bar_filled);

    /* draw cursor */
    if (cursor->type == NK_STYLE_ITEM_IMAGE)
        nk_draw_image(out, *visual_cursor, &cursor->data.image, nk_white);
    else nk_fill_circle(out, *visual_cursor, cursor->data.color);
}

NK_INTERN float
nk_do_slider(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect bounds,
    float min, float val, float max, float step,
    const struct nk_style_slider *style, struct nk_input *in,
    const struct nk_user_font *font)
{
    float slider_range;
    float slider_min;
    float slider_max;
    float slider_value;
    float slider_steps;
    float cursor_offset;

    struct nk_rect visual_cursor;
    struct nk_rect logical_cursor;

    NK_ASSERT(style);
    NK_ASSERT(out);
    if (!out || !style)
        return 0;

    /* remove padding from slider bounds */
    bounds.x = bounds.x + style->padding.x;
    bounds.y = bounds.y + style->padding.y;
    bounds.h = NK_MAX(bounds.h, 2*style->padding.y);
    bounds.w = NK_MAX(bounds.w, 2*style->padding.x + style->cursor_size.x);
    bounds.w -= 2 * style->padding.x;
    bounds.h -= 2 * style->padding.y;

    /* optional buttons */
    if (style->show_buttons) {
        nk_flags ws;
        struct nk_rect button;
        button.y = bounds.y;
        button.w = bounds.h;
        button.h = bounds.h;

        /* decrement button */
        button.x = bounds.x;
        if (nk_do_button_symbol(&ws, out, button, style->dec_symbol, NK_BUTTON_DEFAULT,
            &style->dec_button, in, font))
            val -= step;

        /* increment button */
        button.x = (bounds.x + bounds.w) - button.w;
        if (nk_do_button_symbol(&ws, out, button, style->inc_symbol, NK_BUTTON_DEFAULT,
            &style->inc_button, in, font))
            val += step;

        bounds.x = bounds.x + button.w + style->spacing.x;
        bounds.w = bounds.w - (2*button.w + 2*style->spacing.x);
    }

    /* remove one cursor size to support visual cursor */
    bounds.x += style->cursor_size.x*0.5f;
    bounds.w -= style->cursor_size.x;

    /* make sure the provided values are correct */
    slider_max = NK_MAX(min, max);
    slider_min = NK_MIN(min, max);
    slider_value = NK_CLAMP(slider_min, val, slider_max);
    slider_range = slider_max - slider_min;
    slider_steps = slider_range / step;
    cursor_offset = (slider_value - slider_min) / step;

    /* calculate cursor
    Basically you have two cursors. One for visual representation and interaction
    and one for updating the actual cursor value. */
    logical_cursor.h = bounds.h;
    logical_cursor.w = bounds.w / slider_steps;
    logical_cursor.x = bounds.x + (logical_cursor.w * cursor_offset);
    logical_cursor.y = bounds.y;

    visual_cursor.h = style->cursor_size.y;
    visual_cursor.w = style->cursor_size.x;
    visual_cursor.y = (bounds.y + bounds.h*0.5f) - visual_cursor.h*0.5f;
    visual_cursor.x = logical_cursor.x - visual_cursor.w*0.5f;

    slider_value = nk_slider_behavior(state, &logical_cursor, &visual_cursor,
        in, bounds, slider_min, slider_max, slider_value, step, slider_steps);
    visual_cursor.x = logical_cursor.x - visual_cursor.w*0.5f;

    /* draw slider */
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_slider(out, *state, style, &bounds, &visual_cursor, slider_min, slider_value, slider_max);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return slider_value;
}

/* ===============================================================
 *
 *                          PROGRESSBAR
 *
 * ===============================================================*/
NK_INTERN nk_size
nk_progress_behavior(nk_flags *state, const struct nk_input *in,
    struct nk_rect r, nk_size max, nk_size value, int modifiable)
{
    nk_widget_state_reset(state);
    if (in && modifiable && nk_input_is_mouse_hovering_rect(in, r)) {
        int left_mouse_down = in->mouse.buttons[NK_BUTTON_LEFT].down;
        int left_mouse_click_in_cursor = nk_input_has_mouse_click_down_in_rect(in,
            NK_BUTTON_LEFT, r, nk_true);

        if (left_mouse_down && left_mouse_click_in_cursor) {
            float ratio = NK_MAX(0, (float)(in->mouse.pos.x - r.x)) / (float)r.w;
            value = (nk_size)NK_MAX(0,((float)max * ratio));
            *state = NK_WIDGET_STATE_ACTIVE;
        } else *state = NK_WIDGET_STATE_HOVERED;
    }

    /* set progressbar widget state */
    if (*state & NK_WIDGET_STATE_HOVER && !nk_input_is_mouse_prev_hovering_rect(in, r))
        *state |= NK_WIDGET_STATE_ENTERED;
    else if (nk_input_is_mouse_prev_hovering_rect(in, r))
        *state |= NK_WIDGET_STATE_LEFT;

    if (!max) return value;
    value = NK_MIN(value, max);
    return value;
}

NK_INTERN void
nk_draw_progress(struct nk_command_buffer *out, nk_flags state,
    const struct nk_style_progress *style, const struct nk_rect *bounds,
    const struct nk_rect *scursor, nk_size value, nk_size max)
{
    const struct nk_style_item *background;
    const struct nk_style_item *cursor;

    NK_UNUSED(max);
    NK_UNUSED(value);

    /* select correct colors/images to draw */
    if (state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->active;
        cursor = &style->cursor_active;
    } else if (state & NK_WIDGET_STATE_HOVER){
        background = &style->hover;
        cursor = &style->cursor_hover;
    } else {
        background = &style->normal;
        cursor = &style->cursor_normal;
    }

    /* draw background */
    if (background->type == NK_STYLE_ITEM_COLOR) {
        nk_fill_rect(out, *bounds, style->rounding, background->data.color);
        nk_stroke_rect(out, *bounds, style->rounding, style->border, style->border_color);
    } else nk_draw_image(out, *bounds, &background->data.image, nk_white);

    /* draw cursor */
    if (cursor->type == NK_STYLE_ITEM_COLOR) {
        nk_fill_rect(out, *scursor, style->rounding, cursor->data.color);
        nk_stroke_rect(out, *scursor, style->rounding, style->border, style->border_color);
    } else nk_draw_image(out, *scursor, &cursor->data.image, nk_white);
}

NK_INTERN nk_size
nk_do_progress(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect bounds,
    nk_size value, nk_size max, int modifiable,
    const struct nk_style_progress *style, const struct nk_input *in)
{
    float prog_scale;
    nk_size prog_value;
    struct nk_rect cursor;

    NK_ASSERT(style);
    NK_ASSERT(out);
    if (!out || !style) return 0;

    /* calculate progressbar cursor */
    cursor.w = NK_MAX(bounds.w, 2 * style->padding.x + 2 * style->border);
    cursor.h = NK_MAX(bounds.h, 2 * style->padding.y + 2 * style->border);
    cursor = nk_pad_rect(bounds, nk_vec2(style->padding.x + style->border, style->padding.y + style->border));
    prog_scale = (float)value / (float)max;
    cursor.w = (bounds.w - 2) * prog_scale;

    /* update progressbar */
    prog_value = NK_MIN(value, max);
    prog_value = nk_progress_behavior(state, in, bounds, max, prog_value, modifiable);

    /* draw progressbar */
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_progress(out, *state, style, &bounds, &cursor, value, max);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return prog_value;
}

/* ===============================================================
 *
 *                          SCROLLBAR
 *
 * ===============================================================*/
NK_INTERN float
nk_scrollbar_behavior(nk_flags *state, struct nk_input *in,
    int has_scrolling, const struct nk_rect *scroll,
    const struct nk_rect *cursor, const struct nk_rect *empty0,
    const struct nk_rect *empty1, float scroll_offset,
    float target, float scroll_step, enum nk_orientation o)
{
    nk_flags ws = 0;
    int left_mouse_down;
    int left_mouse_click_in_cursor;
    float scroll_delta;

    nk_widget_state_reset(state);
    if (!in) return scroll_offset;

    left_mouse_down = in->mouse.buttons[NK_BUTTON_LEFT].down;
    left_mouse_click_in_cursor = nk_input_has_mouse_click_down_in_rect(in,
        NK_BUTTON_LEFT, *cursor, nk_true);
    if (nk_input_is_mouse_hovering_rect(in, *scroll))
        *state = NK_WIDGET_STATE_HOVERED;

    scroll_delta = (o == NK_VERTICAL) ? in->mouse.scroll_delta.y: in->mouse.scroll_delta.x;
    if (left_mouse_down && left_mouse_click_in_cursor) {
        /* update cursor by mouse dragging */
        float pixel, delta;
        *state = NK_WIDGET_STATE_ACTIVE;
        if (o == NK_VERTICAL) {
            float cursor_y;
            pixel = in->mouse.delta.y;
            delta = (pixel / scroll->h) * target;
            scroll_offset = NK_CLAMP(0, scroll_offset + delta, target - scroll->h);
            cursor_y = scroll->y + ((scroll_offset/target) * scroll->h);
            in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.y = cursor_y + cursor->h/2.0f;
        } else {
            float cursor_x;
            pixel = in->mouse.delta.x;
            delta = (pixel / scroll->w) * target;
            scroll_offset = NK_CLAMP(0, scroll_offset + delta, target - scroll->w);
            cursor_x = scroll->x + ((scroll_offset/target) * scroll->w);
            in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.x = cursor_x + cursor->w/2.0f;
        }
    } else if ((nk_input_is_key_pressed(in, NK_KEY_SCROLL_UP) && o == NK_VERTICAL && has_scrolling)||
            nk_button_behavior(&ws, *empty0, in, NK_BUTTON_DEFAULT)) {
        /* scroll page up by click on empty space or shortcut */
        if (o == NK_VERTICAL)
            scroll_offset = NK_MAX(0, scroll_offset - scroll->h);
        else scroll_offset = NK_MAX(0, scroll_offset - scroll->w);
    } else if ((nk_input_is_key_pressed(in, NK_KEY_SCROLL_DOWN) && o == NK_VERTICAL && has_scrolling) ||
        nk_button_behavior(&ws, *empty1, in, NK_BUTTON_DEFAULT)) {
        /* scroll page down by click on empty space or shortcut */
        if (o == NK_VERTICAL)
            scroll_offset = NK_MIN(scroll_offset + scroll->h, target - scroll->h);
        else scroll_offset = NK_MIN(scroll_offset + scroll->w, target - scroll->w);
    } else if (has_scrolling) {
        if ((scroll_delta < 0 || (scroll_delta > 0))) {
            /* update cursor by mouse scrolling */
            scroll_offset = scroll_offset + scroll_step * (-scroll_delta);
            if (o == NK_VERTICAL)
                scroll_offset = NK_CLAMP(0, scroll_offset, target - scroll->h);
            else scroll_offset = NK_CLAMP(0, scroll_offset, target - scroll->w);
        } else if (nk_input_is_key_pressed(in, NK_KEY_SCROLL_START)) {
            /* update cursor to the beginning  */
            if (o == NK_VERTICAL) scroll_offset = 0;
        } else if (nk_input_is_key_pressed(in, NK_KEY_SCROLL_END)) {
            /* update cursor to the end */
            if (o == NK_VERTICAL) scroll_offset = target - scroll->h;
        }
    }
    if (*state & NK_WIDGET_STATE_HOVER && !nk_input_is_mouse_prev_hovering_rect(in, *scroll))
        *state |= NK_WIDGET_STATE_ENTERED;
    else if (nk_input_is_mouse_prev_hovering_rect(in, *scroll))
        *state |= NK_WIDGET_STATE_LEFT;
    return scroll_offset;
}

NK_INTERN void
nk_draw_scrollbar(struct nk_command_buffer *out, nk_flags state,
    const struct nk_style_scrollbar *style, const struct nk_rect *bounds,
    const struct nk_rect *scroll)
{
    const struct nk_style_item *background;
    const struct nk_style_item *cursor;

    /* select correct colors/images to draw */
    if (state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->active;
        cursor = &style->cursor_active;
    } else if (state & NK_WIDGET_STATE_HOVER) {
        background = &style->hover;
        cursor = &style->cursor_hover;
    } else {
        background = &style->normal;
        cursor = &style->cursor_normal;
    }

    /* draw background */
    if (background->type == NK_STYLE_ITEM_COLOR) {
        nk_fill_rect(out, *bounds, style->rounding, background->data.color);
        nk_stroke_rect(out, *bounds, style->rounding, style->border, style->border_color);
    } else {
        nk_draw_image(out, *bounds, &background->data.image, nk_white);
    }

    /* draw cursor */
    if (background->type == NK_STYLE_ITEM_COLOR) {
        nk_fill_rect(out, *scroll, style->rounding_cursor, cursor->data.color);
        nk_stroke_rect(out, *scroll, style->rounding_cursor, style->border_cursor, style->cursor_border_color);
    } else nk_draw_image(out, *scroll, &cursor->data.image, nk_white);
}

NK_INTERN float
nk_do_scrollbarv(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect scroll, int has_scrolling,
    float offset, float target, float step, float button_pixel_inc,
    const struct nk_style_scrollbar *style, struct nk_input *in,
    const struct nk_user_font *font)
{
    struct nk_rect empty_north;
    struct nk_rect empty_south;
    struct nk_rect cursor;

    float scroll_step;
    float scroll_offset;
    float scroll_off;
    float scroll_ratio;

    NK_ASSERT(out);
    NK_ASSERT(style);
    NK_ASSERT(state);
    if (!out || !style) return 0;

    scroll.w = NK_MAX(scroll.w, 1);
    scroll.h = NK_MAX(scroll.h, 0);
    if (target <= scroll.h) return 0;

    /* optional scrollbar buttons */
    if (style->show_buttons) {
        nk_flags ws;
        float scroll_h;
        struct nk_rect button;

        button.x = scroll.x;
        button.w = scroll.w;
        button.h = scroll.w;

        scroll_h = NK_MAX(scroll.h - 2 * button.h,0);
        scroll_step = NK_MIN(step, button_pixel_inc);

        /* decrement button */
        button.y = scroll.y;
        if (nk_do_button_symbol(&ws, out, button, style->dec_symbol,
            NK_BUTTON_REPEATER, &style->dec_button, in, font))
            offset = offset - scroll_step;

        /* increment button */
        button.y = scroll.y + scroll.h - button.h;
        if (nk_do_button_symbol(&ws, out, button, style->inc_symbol,
            NK_BUTTON_REPEATER, &style->inc_button, in, font))
            offset = offset + scroll_step;

        scroll.y = scroll.y + button.h;
        scroll.h = scroll_h;
    }

    /* calculate scrollbar constants */
    scroll_step = NK_MIN(step, scroll.h);
    scroll_offset = NK_CLAMP(0, offset, target - scroll.h);
    scroll_ratio = scroll.h / target;
    scroll_off = scroll_offset / target;

    /* calculate scrollbar cursor bounds */
    cursor.h = NK_MAX((scroll_ratio * scroll.h) - (2*style->border + 2*style->padding.y), 0);
    cursor.y = scroll.y + (scroll_off * scroll.h) + style->border + style->padding.y;
    cursor.w = scroll.w - (2 * style->border + 2 * style->padding.x);
    cursor.x = scroll.x + style->border + style->padding.x;

    /* calculate empty space around cursor */
    empty_north.x = scroll.x;
    empty_north.y = scroll.y;
    empty_north.w = scroll.w;
    empty_north.h = NK_MAX(cursor.y - scroll.y, 0);

    empty_south.x = scroll.x;
    empty_south.y = cursor.y + cursor.h;
    empty_south.w = scroll.w;
    empty_south.h = NK_MAX((scroll.y + scroll.h) - (cursor.y + cursor.h), 0);

    /* update scrollbar */
    scroll_offset = nk_scrollbar_behavior(state, in, has_scrolling, &scroll, &cursor,
        &empty_north, &empty_south, scroll_offset, target, scroll_step, NK_VERTICAL);
    scroll_off = scroll_offset / target;
    cursor.y = scroll.y + (scroll_off * scroll.h) + style->border_cursor + style->padding.y;

    /* draw scrollbar */
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_scrollbar(out, *state, style, &scroll, &cursor);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return scroll_offset;
}

NK_INTERN float
nk_do_scrollbarh(nk_flags *state,
    struct nk_command_buffer *out, struct nk_rect scroll, int has_scrolling,
    float offset, float target, float step, float button_pixel_inc,
    const struct nk_style_scrollbar *style, struct nk_input *in,
    const struct nk_user_font *font)
{
    struct nk_rect cursor;
    struct nk_rect empty_west;
    struct nk_rect empty_east;

    float scroll_step;
    float scroll_offset;
    float scroll_off;
    float scroll_ratio;

    NK_ASSERT(out);
    NK_ASSERT(style);
    if (!out || !style) return 0;

    /* scrollbar background */
    scroll.h = NK_MAX(scroll.h, 1);
    scroll.w = NK_MAX(scroll.w, 2 * scroll.h);
    if (target <= scroll.w) return 0;

    /* optional scrollbar buttons */
    if (style->show_buttons) {
        nk_flags ws;
        float scroll_w;
        struct nk_rect button;
        button.y = scroll.y;
        button.w = scroll.h;
        button.h = scroll.h;

        scroll_w = scroll.w - 2 * button.w;
        scroll_step = NK_MIN(step, button_pixel_inc);

        /* decrement button */
        button.x = scroll.x;
        if (nk_do_button_symbol(&ws, out, button, style->dec_symbol,
            NK_BUTTON_REPEATER, &style->dec_button, in, font))
            offset = offset - scroll_step;

        /* increment button */
        button.x = scroll.x + scroll.w - button.w;
        if (nk_do_button_symbol(&ws, out, button, style->inc_symbol,
            NK_BUTTON_REPEATER, &style->inc_button, in, font))
            offset = offset + scroll_step;

        scroll.x = scroll.x + button.w;
        scroll.w = scroll_w;
    }

    /* calculate scrollbar constants */
    scroll_step = NK_MIN(step, scroll.w);
    scroll_offset = NK_CLAMP(0, offset, target - scroll.w);
    scroll_ratio = scroll.w / target;
    scroll_off = scroll_offset / target;

    /* calculate cursor bounds */
    cursor.w = (scroll_ratio * scroll.w) - (2*style->border + 2*style->padding.x);
    cursor.x = scroll.x + (scroll_off * scroll.w) + style->border + style->padding.x;
    cursor.h = scroll.h - (2 * style->border + 2 * style->padding.y);
    cursor.y = scroll.y + style->border + style->padding.y;

    /* calculate empty space around cursor */
    empty_west.x = scroll.x;
    empty_west.y = scroll.y;
    empty_west.w = cursor.x - scroll.x;
    empty_west.h = scroll.h;

    empty_east.x = cursor.x + cursor.w;
    empty_east.y = scroll.y;
    empty_east.w = (scroll.x + scroll.w) - (cursor.x + cursor.w);
    empty_east.h = scroll.h;

    /* update scrollbar */
    scroll_offset = nk_scrollbar_behavior(state, in, has_scrolling, &scroll, &cursor,
        &empty_west, &empty_east, scroll_offset, target, scroll_step, NK_HORIZONTAL);
    scroll_off = scroll_offset / target;
    cursor.x = scroll.x + (scroll_off * scroll.w);

    /* draw scrollbar */
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_scrollbar(out, *state, style, &scroll, &cursor);
    if (style->draw_end) style->draw_end(out, style->userdata);
    return scroll_offset;
}

/* ===============================================================
 *
 *                          FILTER
 *
 * ===============================================================*/
NK_API int nk_filter_default(const struct nk_text_edit *box, nk_rune unicode)
{(void)unicode;NK_UNUSED(box);return nk_true;}

NK_API int
nk_filter_ascii(const struct nk_text_edit *box, nk_rune unicode)
{
    NK_UNUSED(box);
    if (unicode > 128) return nk_false;
    else return nk_true;
}

NK_API int
nk_filter_float(const struct nk_text_edit *box, nk_rune unicode)
{
    NK_UNUSED(box);
    if ((unicode < '0' || unicode > '9') && unicode != '.' && unicode != '-')
        return nk_false;
    else return nk_true;
}

NK_API int
nk_filter_decimal(const struct nk_text_edit *box, nk_rune unicode)
{
    NK_UNUSED(box);
    if ((unicode < '0' || unicode > '9') && unicode != '-')
        return nk_false;
    else return nk_true;
}

NK_API int
nk_filter_hex(const struct nk_text_edit *box, nk_rune unicode)
{
    NK_UNUSED(box);
    if ((unicode < '0' || unicode > '9') &&
        (unicode < 'a' || unicode > 'f') &&
        (unicode < 'A' || unicode > 'F'))
        return nk_false;
    else return nk_true;
}

NK_API int
nk_filter_oct(const struct nk_text_edit *box, nk_rune unicode)
{
    NK_UNUSED(box);
    if (unicode < '0' || unicode > '7')
        return nk_false;
    else return nk_true;
}

NK_API int
nk_filter_binary(const struct nk_text_edit *box, nk_rune unicode)
{
    NK_UNUSED(box);
    if (unicode != '0' && unicode != '1')
        return nk_false;
    else return nk_true;
}

/* ===============================================================
 *
 *                          EDIT
 *
 * ===============================================================*/
NK_INTERN void
nk_edit_draw_text(struct nk_command_buffer *out,
    const struct nk_style_edit *style, float pos_x, float pos_y,
    float x_offset, const char *text, int byte_len, float row_height,
    const struct nk_user_font *font, struct nk_color background,
    struct nk_color foreground, int is_selected)
{
    NK_ASSERT(out);
    NK_ASSERT(font);
    NK_ASSERT(style);
    if (!text || !byte_len || !out || !style) return;

    {int glyph_len = 0;
    nk_rune unicode = 0;
    int text_len = 0;
    float line_width = 0;
    float glyph_width;
    const char *line = text;
    float line_offset = 0;
    int line_count = 0;

    struct nk_text txt;
    txt.padding = nk_vec2(0,0);
    txt.background = background;
    txt.text = foreground;

    glyph_len = nk_utf_decode(text+text_len, &unicode, byte_len-text_len);
    if (!glyph_len) return;
    while ((text_len < byte_len) && glyph_len)
    {
        if (unicode == '\n') {
            /* new line separator so draw previous line */
            struct nk_rect label;
            label.y = pos_y + line_offset;
            label.h = row_height;
            label.w = line_width;
            label.x = pos_x;
            if (!line_count)
                label.x += x_offset;

            if (is_selected) /* selection needs to draw different background color */
                nk_fill_rect(out, label, 0, background);
            nk_widget_text(out, label, line, (int)((text + text_len) - line),
                &txt, NK_TEXT_CENTERED, font);

            text_len++;
            line_count++;
            line_width = 0;
            line = text + text_len;
            line_offset += row_height;
            glyph_len = nk_utf_decode(text + text_len, &unicode, (int)(byte_len-text_len));
            continue;
        }
        if (unicode == '\r') {
            text_len++;
            glyph_len = nk_utf_decode(text + text_len, &unicode, byte_len-text_len);
            continue;
        }
        glyph_width = font->width(font->userdata, font->height, text+text_len, glyph_len);
        line_width += (float)glyph_width;
        text_len += glyph_len;
        glyph_len = nk_utf_decode(text + text_len, &unicode, byte_len-text_len);
        continue;
    }
    if (line_width > 0) {
        /* draw last line */
        struct nk_rect label;
        label.y = pos_y + line_offset;
        label.h = row_height;
        label.w = line_width;
        label.x = pos_x;
        if (!line_count)
            label.x += x_offset;

        if (is_selected)
            nk_fill_rect(out, label, 0, background);
        nk_widget_text(out, label, line, (int)((text + text_len) - line),
            &txt, NK_TEXT_LEFT, font);
    }}
}

NK_INTERN nk_flags
nk_do_edit(nk_flags *state, struct nk_command_buffer *out,
    struct nk_rect bounds, nk_flags flags, nk_plugin_filter filter,
    struct nk_text_edit *edit, const struct nk_style_edit *style,
    struct nk_input *in, const struct nk_user_font *font)
{
    struct nk_rect area;
    nk_flags ret = 0;
    float row_height;
    char prev_state = 0;
    char is_hovered = 0;
    char select_all = 0;
    char cursor_follow = 0;
    struct nk_rect old_clip;
    struct nk_rect clip;

    NK_ASSERT(state);
    NK_ASSERT(out);
    NK_ASSERT(style);
    if (!state || !out || !style)
        return ret;

    /* visible text area calculation */
    area.x = bounds.x + style->padding.x + style->border;
    area.y = bounds.y + style->padding.y + style->border;
    area.w = bounds.w - (2.0f * style->padding.x + 2 * style->border);
    area.h = bounds.h - (2.0f * style->padding.y + 2 * style->border);
    if (flags & NK_EDIT_MULTILINE)
        area.w = NK_MAX(0, area.w - style->scrollbar_size.x);
    row_height = (flags & NK_EDIT_MULTILINE)? font->height + style->row_padding: area.h;

    /* calculate clipping rectangle */
    old_clip = out->clip;
    nk_unify(&clip, &old_clip, area.x, area.y, area.x + area.w, area.y + area.h);

    /* update edit state */
    prev_state = (char)edit->active;
    is_hovered = (char)nk_input_is_mouse_hovering_rect(in, bounds);
    if (in && in->mouse.buttons[NK_BUTTON_LEFT].clicked && in->mouse.buttons[NK_BUTTON_LEFT].down) {
        edit->active = NK_INBOX(in->mouse.pos.x, in->mouse.pos.y,
                                bounds.x, bounds.y, bounds.w, bounds.h);
    }

    /* (de)activate text editor */
    if (!prev_state && edit->active) {
        const enum nk_text_edit_type type = (flags & NK_EDIT_MULTILINE) ?
            NK_TEXT_EDIT_MULTI_LINE: NK_TEXT_EDIT_SINGLE_LINE;
        nk_textedit_clear_state(edit, type, filter);
        if (flags & NK_EDIT_ALWAYS_INSERT_MODE)
            edit->mode = NK_TEXT_EDIT_MODE_INSERT;
        if (flags & NK_EDIT_AUTO_SELECT)
            select_all = nk_true;
        if (flags & NK_EDIT_GOTO_END_ON_ACTIVATE) {
            edit->cursor = edit->string.len;
            in = 0;
        }
    } else if (!edit->active) edit->mode = NK_TEXT_EDIT_MODE_VIEW;
    if (flags & NK_EDIT_READ_ONLY)
        edit->mode = NK_TEXT_EDIT_MODE_VIEW;

    ret = (edit->active) ? NK_EDIT_ACTIVE: NK_EDIT_INACTIVE;
    if (prev_state != edit->active)
        ret |= (edit->active) ? NK_EDIT_ACTIVATED: NK_EDIT_DEACTIVATED;

    /* handle user input */
    if (edit->active && in)
    {
        int shift_mod = in->keyboard.keys[NK_KEY_SHIFT].down;
        const float mouse_x = (in->mouse.pos.x - area.x) + edit->scrollbar.x;
        const float mouse_y = (in->mouse.pos.y - area.y) + edit->scrollbar.y;

        /* mouse click handler */
        is_hovered = (char)nk_input_is_mouse_hovering_rect(in, area);
        if (select_all) {
            nk_textedit_select_all(edit);
        } else if (is_hovered && in->mouse.buttons[NK_BUTTON_LEFT].down &&
            in->mouse.buttons[NK_BUTTON_LEFT].clicked) {
            nk_textedit_click(edit, mouse_x, mouse_y, font, row_height);
        } else if (is_hovered && in->mouse.buttons[NK_BUTTON_LEFT].down &&
            (in->mouse.delta.x != 0.0f || in->mouse.delta.y != 0.0f)) {
            nk_textedit_drag(edit, mouse_x, mouse_y, font, row_height);
            cursor_follow = nk_true;
        } else if (is_hovered && in->mouse.buttons[NK_BUTTON_RIGHT].clicked &&
            in->mouse.buttons[NK_BUTTON_RIGHT].down) {
            nk_textedit_key(edit, NK_KEY_TEXT_WORD_LEFT, nk_false, font, row_height);
            nk_textedit_key(edit, NK_KEY_TEXT_WORD_RIGHT, nk_true, font, row_height);
            cursor_follow = nk_true;
        }

        {int i; /* keyboard input */
        int old_mode = edit->mode;
        for (i = 0; i < NK_KEY_MAX; ++i) {
            if (i == NK_KEY_ENTER || i == NK_KEY_TAB) continue; /* special case */
            if (nk_input_is_key_pressed(in, (enum nk_keys)i)) {
                nk_textedit_key(edit, (enum nk_keys)i, shift_mod, font, row_height);
                cursor_follow = nk_true;
            }
        }
        if (old_mode != edit->mode) {
            in->keyboard.text_len = 0;
        }}

        /* text input */
        edit->filter = filter;
        if (in->keyboard.text_len) {
            nk_textedit_text(edit, in->keyboard.text, in->keyboard.text_len);
            cursor_follow = nk_true;
            in->keyboard.text_len = 0;
        }

        /* enter key handler */
        if (nk_input_is_key_pressed(in, NK_KEY_ENTER)) {
            cursor_follow = nk_true;
            if (flags & NK_EDIT_CTRL_ENTER_NEWLINE && shift_mod)
                nk_textedit_text(edit, "\n", 1);
            else if (flags & NK_EDIT_SIG_ENTER)
                ret |= NK_EDIT_COMMITED;
            else nk_textedit_text(edit, "\n", 1);
        }

        /* cut & copy handler */
        {int copy= nk_input_is_key_pressed(in, NK_KEY_COPY);
        int cut = nk_input_is_key_pressed(in, NK_KEY_CUT);
        if ((copy || cut) && (flags & NK_EDIT_CLIPBOARD))
        {
            int glyph_len;
            nk_rune unicode;
            const char *text;
            int b = edit->select_start;
            int e = edit->select_end;

            int begin = NK_MIN(b, e);
            int end = NK_MAX(b, e);
            text = nk_str_at_const(&edit->string, begin, &unicode, &glyph_len);
            if (edit->clip.copy)
                edit->clip.copy(edit->clip.userdata, text, end - begin);
            if (cut && !(flags & NK_EDIT_READ_ONLY)){
                nk_textedit_cut(edit);
                cursor_follow = nk_true;
            }
        }}

        /* paste handler */
        {int paste = nk_input_is_key_pressed(in, NK_KEY_PASTE);
        if (paste && (flags & NK_EDIT_CLIPBOARD) && edit->clip.paste) {
            edit->clip.paste(edit->clip.userdata, edit);
            cursor_follow = nk_true;
        }}

        /* tab handler */
        {int tab = nk_input_is_key_pressed(in, NK_KEY_TAB);
        if (tab && (flags & NK_EDIT_ALLOW_TAB)) {
            nk_textedit_text(edit, "    ", 4);
            cursor_follow = nk_true;
        }}
    }

    /* set widget state */
    if (edit->active)
        *state = NK_WIDGET_STATE_ACTIVE;
    else nk_widget_state_reset(state);

    if (is_hovered)
        *state |= NK_WIDGET_STATE_HOVERED;

    /* DRAW EDIT */
    {const char *text = nk_str_get_const(&edit->string);
    int len = nk_str_len_char(&edit->string);

    {/* select background colors/images  */
    const struct nk_style_item *background;
    if (*state & NK_WIDGET_STATE_ACTIVED)
        background = &style->active;
    else if (*state & NK_WIDGET_STATE_HOVER)
        background = &style->hover;
    else background = &style->normal;

    /* draw background frame */
    if (background->type == NK_STYLE_ITEM_COLOR) {
        nk_stroke_rect(out, bounds, style->rounding, style->border, style->border_color);
        nk_fill_rect(out, bounds, style->rounding, background->data.color);
    } else nk_draw_image(out, bounds, &background->data.image, nk_white);}

    area.w = NK_MAX(0, area.w - style->cursor_size);
    if (edit->active)
    {
        int total_lines = 1;
        struct nk_vec2 text_size = nk_vec2(0,0);

        /* text pointer positions */
        const char *cursor_ptr = 0;
        const char *select_begin_ptr = 0;
        const char *select_end_ptr = 0;

        /* 2D pixel positions */
        struct nk_vec2 cursor_pos = nk_vec2(0,0);
        struct nk_vec2 selection_offset_start = nk_vec2(0,0);
        struct nk_vec2 selection_offset_end = nk_vec2(0,0);

        int selection_begin = NK_MIN(edit->select_start, edit->select_end);
        int selection_end = NK_MAX(edit->select_start, edit->select_end);

        /* calculate total line count + total space + cursor/selection position */
        float line_width = 0.0f;
        if (text && len)
        {
            /* utf8 encoding */
            float glyph_width;
            int glyph_len = 0;
            nk_rune unicode = 0;
            int text_len = 0;
            int glyphs = 0;
            int row_begin = 0;

            glyph_len = nk_utf_decode(text, &unicode, len);
            glyph_width = font->width(font->userdata, font->height, text, glyph_len);
            line_width = 0;

            /* iterate all lines */
            while ((text_len < len) && glyph_len)
            {
                /* set cursor 2D position and line */
                if (!cursor_ptr && glyphs == edit->cursor)
                {
                    int glyph_offset;
                    struct nk_vec2 out_offset;
                    struct nk_vec2 row_size;
                    const char *remaining;

                    /* calculate 2d position */
                    cursor_pos.y = (float)(total_lines-1) * row_height;
                    row_size = nk_text_calculate_text_bounds(font, text+row_begin,
                                text_len-row_begin, row_height, &remaining,
                                &out_offset, &glyph_offset, NK_STOP_ON_NEW_LINE);
                    cursor_pos.x = row_size.x;
                    cursor_ptr = text + text_len;
                }

                /* set start selection 2D position and line */
                if (!select_begin_ptr && edit->select_start != edit->select_end &&
                    glyphs == selection_begin)
                {
                    int glyph_offset;
                    struct nk_vec2 out_offset;
                    struct nk_vec2 row_size;
                    const char *remaining;

                    /* calculate 2d position */
                    selection_offset_start.y = (float)(NK_MAX(total_lines-1,0)) * row_height;
                    row_size = nk_text_calculate_text_bounds(font, text+row_begin,
                                text_len-row_begin, row_height, &remaining,
                                &out_offset, &glyph_offset, NK_STOP_ON_NEW_LINE);
                    selection_offset_start.x = row_size.x;
                    select_begin_ptr = text + text_len;
                }

                /* set end selection 2D position and line */
                if (!select_end_ptr && edit->select_start != edit->select_end &&
                    glyphs == selection_end)
                {
                    int glyph_offset;
                    struct nk_vec2 out_offset;
                    struct nk_vec2 row_size;
                    const char *remaining;

                    /* calculate 2d position */
                    selection_offset_end.y = (float)(total_lines-1) * row_height;
                    row_size = nk_text_calculate_text_bounds(font, text+row_begin,
                                text_len-row_begin, row_height, &remaining,
                                &out_offset, &glyph_offset, NK_STOP_ON_NEW_LINE);
                    selection_offset_end.x = row_size.x;
                    select_end_ptr = text + text_len;
                }
                if (unicode == '\n') {
                    text_size.x = NK_MAX(text_size.x, line_width);
                    total_lines++;
                    line_width = 0;
                    text_len++;
                    glyphs++;
                    row_begin = text_len;
                    glyph_len = nk_utf_decode(text + text_len, &unicode, len-text_len);
                    glyph_width = font->width(font->userdata, font->height, text+text_len, glyph_len);
                    continue;
                }

                glyphs++;
                text_len += glyph_len;
                line_width += (float)glyph_width;

                glyph_len = nk_utf_decode(text + text_len, &unicode, len-text_len);
                glyph_width = font->width(font->userdata, font->height,
                    text+text_len, glyph_len);
                continue;
            }
            text_size.y = (float)total_lines * row_height;

            /* handle case when cursor is at end of text buffer */
            if (!cursor_ptr && edit->cursor == edit->string.len) {
                cursor_pos.x = line_width;
                cursor_pos.y = text_size.y - row_height;
            }
        }
        {
            /* scrollbar */
            if (cursor_follow)
            {
                /* update scrollbar to follow cursor */
                if (!(flags & NK_EDIT_NO_HORIZONTAL_SCROLL)) {
                    /* horizontal scroll */
                    const float scroll_increment = area.w * 0.25f;
                    if (cursor_pos.x < edit->scrollbar.x)
                        edit->scrollbar.x = (float)(int)NK_MAX(0.0f, cursor_pos.x - scroll_increment);
                    if (cursor_pos.x >= edit->scrollbar.x + area.w)
                        edit->scrollbar.x = (float)(int)NK_MAX(0.0f, cursor_pos.x);
                } else edit->scrollbar.x = 0;

                if (flags & NK_EDIT_MULTILINE) {
                    /* vertical scroll */
                    if (cursor_pos.y < edit->scrollbar.y)
                        edit->scrollbar.y = NK_MAX(0.0f, cursor_pos.y - row_height);
                    if (cursor_pos.y >= edit->scrollbar.y + area.h)
                        edit->scrollbar.y = edit->scrollbar.y + row_height;
                } else edit->scrollbar.y = 0;
            }

            /* scrollbar widget */
            if (flags & NK_EDIT_MULTILINE)
            {
                nk_flags ws;
                struct nk_rect scroll;
                float scroll_target;
                float scroll_offset;
                float scroll_step;
                float scroll_inc;

                scroll = area;
                scroll.x = (bounds.x + bounds.w - style->border) - style->scrollbar_size.x;
                scroll.w = style->scrollbar_size.x;

                scroll_offset = edit->scrollbar.y;
                scroll_step = scroll.h * 0.10f;
                scroll_inc = scroll.h * 0.01f;
                scroll_target = text_size.y;
                edit->scrollbar.y = nk_do_scrollbarv(&ws, out, scroll, 0,
                        scroll_offset, scroll_target, scroll_step, scroll_inc,
                        &style->scrollbar, in, font);
            }
        }

        /* draw text */
        {struct nk_color background_color;
        struct nk_color text_color;
        struct nk_color sel_background_color;
        struct nk_color sel_text_color;
        struct nk_color cursor_color;
        struct nk_color cursor_text_color;
        const struct nk_style_item *background;
        nk_push_scissor(out, clip);

        /* select correct colors to draw */
        if (*state & NK_WIDGET_STATE_ACTIVED) {
            background = &style->active;
            text_color = style->text_active;
            sel_text_color = style->selected_text_hover;
            sel_background_color = style->selected_hover;
            cursor_color = style->cursor_hover;
            cursor_text_color = style->cursor_text_hover;
        } else if (*state & NK_WIDGET_STATE_HOVER) {
            background = &style->hover;
            text_color = style->text_hover;
            sel_text_color = style->selected_text_hover;
            sel_background_color = style->selected_hover;
            cursor_text_color = style->cursor_text_hover;
            cursor_color = style->cursor_hover;
        } else {
            background = &style->normal;
            text_color = style->text_normal;
            sel_text_color = style->selected_text_normal;
            sel_background_color = style->selected_normal;
            cursor_color = style->cursor_normal;
            cursor_text_color = style->cursor_text_normal;
        }
        if (background->type == NK_STYLE_ITEM_IMAGE)
            background_color = nk_rgba(0,0,0,0);
        else background_color = background->data.color;


        if (edit->select_start == edit->select_end) {
            /* no selection so just draw the complete text */
            const char *begin = nk_str_get_const(&edit->string);
            int l = nk_str_len_char(&edit->string);
            nk_edit_draw_text(out, style, area.x - edit->scrollbar.x,
                area.y - edit->scrollbar.y, 0, begin, l, row_height, font,
                background_color, text_color, nk_false);
        } else {
            /* edit has selection so draw 1-3 text chunks */
            if (edit->select_start != edit->select_end && selection_begin > 0){
                /* draw unselected text before selection */
                const char *begin = nk_str_get_const(&edit->string);
                NK_ASSERT(select_begin_ptr);
                nk_edit_draw_text(out, style, area.x - edit->scrollbar.x,
                    area.y - edit->scrollbar.y, 0, begin, (int)(select_begin_ptr - begin),
                    row_height, font, background_color, text_color, nk_false);
            }
            if (edit->select_start != edit->select_end) {
                /* draw selected text */
                NK_ASSERT(select_begin_ptr);
                if (!select_end_ptr) {
                    const char *begin = nk_str_get_const(&edit->string);
                    select_end_ptr = begin + nk_str_len_char(&edit->string);
                }
                nk_edit_draw_text(out, style,
                    area.x - edit->scrollbar.x,
                    area.y + selection_offset_start.y - edit->scrollbar.y,
                    selection_offset_start.x,
                    select_begin_ptr, (int)(select_end_ptr - select_begin_ptr),
                    row_height, font, sel_background_color, sel_text_color, nk_true);
            }
            if ((edit->select_start != edit->select_end &&
                selection_end < edit->string.len))
            {
                /* draw unselected text after selected text */
                const char *begin = select_end_ptr;
                const char *end = nk_str_get_const(&edit->string) +
                                    nk_str_len_char(&edit->string);
                NK_ASSERT(select_end_ptr);
                nk_edit_draw_text(out, style,
                    area.x - edit->scrollbar.x,
                    area.y + selection_offset_end.y - edit->scrollbar.y,
                    selection_offset_end.x,
                    begin, (int)(end - begin), row_height, font,
                    background_color, text_color, nk_true);
            }
        }

        /* cursor */
        if (edit->select_start == edit->select_end)
        {
            if (edit->cursor >= nk_str_len(&edit->string) ||
                (cursor_ptr && *cursor_ptr == '\n')) {
                /* draw cursor at end of line */
                struct nk_rect cursor;
                cursor.w = style->cursor_size;
                cursor.h = font->height;
                cursor.x = area.x + cursor_pos.x - edit->scrollbar.x;
                cursor.y = area.y + cursor_pos.y + row_height/2.0f - cursor.h/2.0f;
                cursor.y -= edit->scrollbar.y;
                nk_fill_rect(out, cursor, 0, cursor_color);
            } else {
                /* draw cursor inside text */
                int glyph_len;
                struct nk_rect label;
                struct nk_text txt;

                nk_rune unicode;
                NK_ASSERT(cursor_ptr);
                glyph_len = nk_utf_decode(cursor_ptr, &unicode, 4);

                label.x = area.x + cursor_pos.x - edit->scrollbar.x;
                label.y = area.y + cursor_pos.y - edit->scrollbar.y;
                label.w = font->width(font->userdata, font->height, cursor_ptr, glyph_len);
                label.h = row_height;

                txt.padding = nk_vec2(0,0);
                txt.background = cursor_color;;
                txt.text = cursor_text_color;
                nk_fill_rect(out, label, 0, cursor_color);
                nk_widget_text(out, label, cursor_ptr, glyph_len, &txt, NK_TEXT_LEFT, font);
            }
        }}
    } else {
        /* not active so just draw text */
        int l = nk_str_len_char(&edit->string);
        const char *begin = nk_str_get_const(&edit->string);

        const struct nk_style_item *background;
        struct nk_color background_color;
        struct nk_color text_color;
        nk_push_scissor(out, clip);
        if (*state & NK_WIDGET_STATE_ACTIVED) {
            background = &style->active;
            text_color = style->text_active;
        } else if (*state & NK_WIDGET_STATE_HOVER) {
            background = &style->hover;
            text_color = style->text_hover;
        } else {
            background = &style->normal;
            text_color = style->text_normal;
        }
        if (background->type == NK_STYLE_ITEM_IMAGE)
            background_color = nk_rgba(0,0,0,0);
        else background_color = background->data.color;
        nk_edit_draw_text(out, style, area.x - edit->scrollbar.x,
            area.y - edit->scrollbar.y, 0, begin, l, row_height, font,
            background_color, text_color, nk_false);
    }
    nk_push_scissor(out, old_clip);}
    return ret;
}

/* ===============================================================
 *
 *                          PROPERTY
 *
 * ===============================================================*/
enum nk_property_status {
    NK_PROPERTY_DEFAULT,
    NK_PROPERTY_EDIT,
    NK_PROPERTY_DRAG
};
enum nk_property_filter {
    NK_FILTER_INT,
    NK_FILTER_FLOAT
};
enum nk_property_kind {
    NK_PROPERTY_INT,
    NK_PROPERTY_FLOAT,
    NK_PROPERTY_DOUBLE
};
union nk_property {
    int i;
    float f;
    double d;
};
struct nk_property_variant {
    enum nk_property_kind kind;
    union nk_property value;
    union nk_property min_value;
    union nk_property max_value;
    union nk_property step;
};

NK_INTERN void
nk_drag_behavior(nk_flags *state, const struct nk_input *in,
    struct nk_rect drag, struct nk_property_variant *variant,
    float inc_per_pixel)
{
    int left_mouse_down = in && in->mouse.buttons[NK_BUTTON_LEFT].down;
    int left_mouse_click_in_cursor = in &&
        nk_input_has_mouse_click_down_in_rect(in, NK_BUTTON_LEFT, drag, nk_true);

    nk_widget_state_reset(state);
    if (nk_input_is_mouse_hovering_rect(in, drag))
        *state = NK_WIDGET_STATE_HOVERED;

    if (left_mouse_down && left_mouse_click_in_cursor) {
        float delta, pixels;
        pixels = in->mouse.delta.x;
        delta = pixels * inc_per_pixel;
        switch (variant->kind) {
        default: break;
        case NK_PROPERTY_INT:
            variant->value.i = variant->value.i + (int)delta;
            variant->value.i = NK_CLAMP(variant->min_value.i, variant->value.i, variant->max_value.i);
            break;
        case NK_PROPERTY_FLOAT:
            variant->value.f = variant->value.f + (float)delta;
            variant->value.f = NK_CLAMP(variant->min_value.f, variant->value.f, variant->max_value.f);
            break;
        case NK_PROPERTY_DOUBLE:
            variant->value.d = variant->value.d + (double)delta;
            variant->value.d = NK_CLAMP(variant->min_value.d, variant->value.d, variant->max_value.d);
            break;
        }
        *state = NK_WIDGET_STATE_ACTIVE;
    }
    if (*state & NK_WIDGET_STATE_HOVER && !nk_input_is_mouse_prev_hovering_rect(in, drag))
        *state |= NK_WIDGET_STATE_ENTERED;
    else if (nk_input_is_mouse_prev_hovering_rect(in, drag))
        *state |= NK_WIDGET_STATE_LEFT;
}

NK_INTERN void
nk_property_behavior(nk_flags *ws, const struct nk_input *in,
    struct nk_rect property,  struct nk_rect label, struct nk_rect edit,
    struct nk_rect empty, int *state, struct nk_property_variant *variant,
    float inc_per_pixel)
{
    if (in && *state == NK_PROPERTY_DEFAULT) {
        if (nk_button_behavior(ws, edit, in, NK_BUTTON_DEFAULT))
            *state = NK_PROPERTY_EDIT;
        else if (nk_input_is_mouse_click_down_in_rect(in, NK_BUTTON_LEFT, label, nk_true))
            *state = NK_PROPERTY_DRAG;
        else if (nk_input_is_mouse_click_down_in_rect(in, NK_BUTTON_LEFT, empty, nk_true))
            *state = NK_PROPERTY_DRAG;
    }
    if (*state == NK_PROPERTY_DRAG) {
        nk_drag_behavior(ws, in, property, variant, inc_per_pixel);
        if (!(*ws & NK_WIDGET_STATE_ACTIVED)) *state = NK_PROPERTY_DEFAULT;
    }
}

NK_INTERN void
nk_draw_property(struct nk_command_buffer *out, const struct nk_style_property *style,
    const struct nk_rect *bounds, const struct nk_rect *label, nk_flags state,
    const char *name, int len, const struct nk_user_font *font)
{
    struct nk_text text;
    const struct nk_style_item *background;

    /* select correct background and text color */
    if (state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->active;
        text.text = style->label_active;
    } else if (state & NK_WIDGET_STATE_HOVER) {
        background = &style->hover;
        text.text = style->label_hover;
    } else {
        background = &style->normal;
        text.text = style->label_normal;
    }

    /* draw background */
    if (background->type == NK_STYLE_ITEM_IMAGE) {
        nk_draw_image(out, *bounds, &background->data.image, nk_white);
        text.background = nk_rgba(0,0,0,0);
    } else {
        text.background = background->data.color;
        nk_fill_rect(out, *bounds, style->rounding, background->data.color);
        nk_stroke_rect(out, *bounds, style->rounding, style->border, background->data.color);
    }

    /* draw label */
    text.padding = nk_vec2(0,0);
    nk_widget_text(out, *label, name, len, &text, NK_TEXT_CENTERED, font);
}

NK_INTERN void
nk_do_property(nk_flags *ws,
    struct nk_command_buffer *out, struct nk_rect property,
    const char *name, struct nk_property_variant *variant,
    float inc_per_pixel, char *buffer, int *len,
    int *state, int *cursor, int *select_begin, int *select_end,
    const struct nk_style_property *style,
    enum nk_property_filter filter, struct nk_input *in,
    const struct nk_user_font *font, struct nk_text_edit *text_edit,
    enum nk_button_behavior behavior)
{
    const nk_plugin_filter filters[] = {
        nk_filter_decimal,
        nk_filter_float
    };
    int active, old;
    int num_len, name_len;
    char string[NK_MAX_NUMBER_BUFFER];
    float size;

    char *dst = 0;
    int *length;

    struct nk_rect left;
    struct nk_rect right;
    struct nk_rect label;
    struct nk_rect edit;
    struct nk_rect empty;

    /* left decrement button */
    left.h = font->height/2;
    left.w = left.h;
    left.x = property.x + style->border + style->padding.x;
    left.y = property.y + style->border + property.h/2.0f - left.h/2;

    /* text label */
    name_len = nk_strlen(name);
    size = font->width(font->userdata, font->height, name, name_len);
    label.x = left.x + left.w + style->padding.x;
    label.w = (float)size + 2 * style->padding.x;
    label.y = property.y + style->border + style->padding.y;
    label.h = property.h - (2 * style->border + 2 * style->padding.y);

    /* right increment button */
    right.y = left.y;
    right.w = left.w;
    right.h = left.h;
    right.x = property.x + property.w - (right.w + style->padding.x);

    /* edit */
    if (*state == NK_PROPERTY_EDIT) {
        size = font->width(font->userdata, font->height, buffer, *len);
        size += style->edit.cursor_size;
        length = len;
        dst = buffer;
    } else {
        switch (variant->kind) {
        default: break;
        case NK_PROPERTY_INT:
            nk_itoa(string, variant->value.i);
            num_len = nk_strlen(string);
            break;
        case NK_PROPERTY_FLOAT:
            nk_dtoa(string, (double)variant->value.f);
            num_len = nk_string_float_limit(string, NK_MAX_FLOAT_PRECISION);
            break;
        case NK_PROPERTY_DOUBLE:
            nk_dtoa(string, variant->value.d);
            num_len = nk_string_float_limit(string, NK_MAX_FLOAT_PRECISION);
            break;
        }
        size = font->width(font->userdata, font->height, string, num_len);
        dst = string;
        length = &num_len;
    }

    edit.w =  (float)size + 2 * style->padding.x;
    edit.w = NK_MIN(edit.w, right.x - (label.x + label.w));
    edit.x = right.x - (edit.w + style->padding.x);
    edit.y = property.y + style->border;
    edit.h = property.h - (2 * style->border);

    /* empty left space activator */
    empty.w = edit.x - (label.x + label.w);
    empty.x = label.x + label.w;
    empty.y = property.y;
    empty.h = property.h;

    /* update property */
    old = (*state == NK_PROPERTY_EDIT);
    nk_property_behavior(ws, in, property, label, edit, empty, state, variant, inc_per_pixel);

    /* draw property */
    if (style->draw_begin) style->draw_begin(out, style->userdata);
    nk_draw_property(out, style, &property, &label, *ws, name, name_len, font);
    if (style->draw_end) style->draw_end(out, style->userdata);

    /* execute right button  */
    if (nk_do_button_symbol(ws, out, left, style->sym_left, behavior, &style->dec_button, in, font)) {
        switch (variant->kind) {
        default: break;
        case NK_PROPERTY_INT:
            variant->value.i = NK_CLAMP(variant->min_value.i, variant->value.i - variant->step.i, variant->max_value.i); break;
        case NK_PROPERTY_FLOAT:
            variant->value.f = NK_CLAMP(variant->min_value.f, variant->value.f - variant->step.f, variant->max_value.f); break;
        case NK_PROPERTY_DOUBLE:
            variant->value.d = NK_CLAMP(variant->min_value.d, variant->value.d - variant->step.d, variant->max_value.d); break;
        }
    }
    /* execute left button  */
    if (nk_do_button_symbol(ws, out, right, style->sym_right, behavior, &style->inc_button, in, font)) {
        switch (variant->kind) {
        default: break;
        case NK_PROPERTY_INT:
            variant->value.i = NK_CLAMP(variant->min_value.i, variant->value.i + variant->step.i, variant->max_value.i); break;
        case NK_PROPERTY_FLOAT:
            variant->value.f = NK_CLAMP(variant->min_value.f, variant->value.f + variant->step.f, variant->max_value.f); break;
        case NK_PROPERTY_DOUBLE:
            variant->value.d = NK_CLAMP(variant->min_value.d, variant->value.d + variant->step.d, variant->max_value.d); break;
        }
    }
    if (old != NK_PROPERTY_EDIT && (*state == NK_PROPERTY_EDIT)) {
        /* property has been activated so setup buffer */
        NK_MEMCPY(buffer, dst, (nk_size)*length);
        *cursor = nk_utf_len(buffer, *length);
        *len = *length;
        length = len;
        dst = buffer;
        active = 0;
    } else active = (*state == NK_PROPERTY_EDIT);

    /* execute and run text edit field */
    nk_textedit_clear_state(text_edit, NK_TEXT_EDIT_SINGLE_LINE, filters[filter]);
    text_edit->active = (unsigned char)active;
    text_edit->string.len = *length;
    text_edit->cursor = NK_CLAMP(0, *cursor, *length);
    text_edit->select_start = NK_CLAMP(0,*select_begin, *length);
    text_edit->select_end = NK_CLAMP(0,*select_end, *length);
    text_edit->string.buffer.allocated = (nk_size)*length;
    text_edit->string.buffer.memory.size = NK_MAX_NUMBER_BUFFER;
    text_edit->string.buffer.memory.ptr = dst;
    text_edit->string.buffer.size = NK_MAX_NUMBER_BUFFER;
    text_edit->mode = NK_TEXT_EDIT_MODE_INSERT;
    nk_do_edit(ws, out, edit, NK_EDIT_FIELD|NK_EDIT_AUTO_SELECT,
        filters[filter], text_edit, &style->edit, (*state == NK_PROPERTY_EDIT) ? in: 0, font);

    *length = text_edit->string.len;
    *cursor = text_edit->cursor;
    *select_begin = text_edit->select_start;
    *select_end = text_edit->select_end;
    if (text_edit->active && nk_input_is_key_pressed(in, NK_KEY_ENTER))
        text_edit->active = nk_false;

    if (active && !text_edit->active) {
        /* property is now not active so convert edit text to value*/
        *state = NK_PROPERTY_DEFAULT;
        buffer[*len] = '\0';
        switch (variant->kind) {
        default: break;
        case NK_PROPERTY_INT:
            variant->value.i = nk_strtoi(buffer, 0);
            variant->value.i = NK_CLAMP(variant->min_value.i, variant->value.i, variant->max_value.i);
            break;
        case NK_PROPERTY_FLOAT:
            nk_string_float_limit(buffer, NK_MAX_FLOAT_PRECISION);
            variant->value.f = nk_strtof(buffer, 0);
            variant->value.f = NK_CLAMP(variant->min_value.f, variant->value.f, variant->max_value.f);
            break;
        case NK_PROPERTY_DOUBLE:
            nk_string_float_limit(buffer, NK_MAX_FLOAT_PRECISION);
            variant->value.d = nk_strtod(buffer, 0);
            variant->value.d = NK_CLAMP(variant->min_value.d, variant->value.d, variant->max_value.d);
            break;
        }
    }
}
/* ===============================================================
 *
 *                          COLOR PICKER
 *
 * ===============================================================*/
NK_INTERN int
nk_color_picker_behavior(nk_flags *state,
    const struct nk_rect *bounds, const struct nk_rect *matrix,
    const struct nk_rect *hue_bar, const struct nk_rect *alpha_bar,
    struct nk_color *color, const struct nk_input *in)
{
    float hsva[4];
    int value_changed = 0;
    int hsv_changed = 0;

    NK_ASSERT(state);
    NK_ASSERT(matrix);
    NK_ASSERT(hue_bar);
    NK_ASSERT(color);

    /* color matrix */
    nk_color_hsva_fv(hsva, *color);
    if (nk_button_behavior(state, *matrix, in, NK_BUTTON_REPEATER)) {
        hsva[1] = NK_SATURATE((in->mouse.pos.x - matrix->x) / (matrix->w-1));
        hsva[2] = 1.0f - NK_SATURATE((in->mouse.pos.y - matrix->y) / (matrix->h-1));
        value_changed = hsv_changed = 1;
    }

    /* hue bar */
    if (nk_button_behavior(state, *hue_bar, in, NK_BUTTON_REPEATER)) {
        hsva[0] = NK_SATURATE((in->mouse.pos.y - hue_bar->y) / (hue_bar->h-1));
        value_changed = hsv_changed = 1;
    }

    /* alpha bar */
    if (alpha_bar) {
        if (nk_button_behavior(state, *alpha_bar, in, NK_BUTTON_REPEATER)) {
            hsva[3] = 1.0f - NK_SATURATE((in->mouse.pos.y - alpha_bar->y) / (alpha_bar->h-1));
            value_changed = 1;
        }
    }
    nk_widget_state_reset(state);
    if (hsv_changed) {
        *color = nk_hsva_fv(hsva);
        *state = NK_WIDGET_STATE_ACTIVE;
    }
    if (value_changed) {
        color->a = (nk_byte)(hsva[3] * 255.0f);
        *state = NK_WIDGET_STATE_ACTIVE;
    }

    /* set color picker widget state */
    if (nk_input_is_mouse_hovering_rect(in, *bounds))
        *state = NK_WIDGET_STATE_HOVERED;
    if (*state & NK_WIDGET_STATE_HOVER && !nk_input_is_mouse_prev_hovering_rect(in, *bounds))
        *state |= NK_WIDGET_STATE_ENTERED;
    else if (nk_input_is_mouse_prev_hovering_rect(in, *bounds))
        *state |= NK_WIDGET_STATE_LEFT;
    return value_changed;
}

NK_INTERN void
nk_draw_color_picker(struct nk_command_buffer *o, const struct nk_rect *matrix,
    const struct nk_rect *hue_bar, const struct nk_rect *alpha_bar,
    struct nk_color color)
{
    NK_STORAGE const struct nk_color black = {0,0,0,255};
    NK_STORAGE const struct nk_color white = {255, 255, 255, 255};
    NK_STORAGE const struct nk_color black_trans = {0,0,0,0};

    const float crosshair_size = 7.0f;
    struct nk_color temp;
    float hsva[4];
    float line_y;
    int i;

    NK_ASSERT(o);
    NK_ASSERT(matrix);
    NK_ASSERT(hue_bar);

    /* draw hue bar */
    nk_color_hsv_fv(hsva, color);
    for (i = 0; i < 6; ++i) {
        NK_GLOBAL const struct nk_color hue_colors[] = {
            {255, 0, 0, 255},
            {255,255,0,255},
            {0,255,0,255},
            {0, 255,255,255},
            {0,0,255,255},
            {255, 0, 255, 255},
            {255, 0, 0, 255}
        };
        nk_fill_rect_multi_color(o,
            nk_rect(hue_bar->x, hue_bar->y + (float)i * (hue_bar->h/6.0f) + 0.5f,
                hue_bar->w, (hue_bar->h/6.0f) + 0.5f), hue_colors[i], hue_colors[i],
                hue_colors[i+1], hue_colors[i+1]);
    }
    line_y = (float)(int)(hue_bar->y + hsva[0] * matrix->h + 0.5f);
    nk_stroke_line(o, hue_bar->x-1, line_y, hue_bar->x + hue_bar->w + 2,
        line_y, 1, nk_rgb(255,255,255));

    /* draw alpha bar */
    if (alpha_bar) {
        float alpha = NK_SATURATE((float)color.a/255.0f);
        line_y = (float)(int)(alpha_bar->y +  (1.0f - alpha) * matrix->h + 0.5f);

        nk_fill_rect_multi_color(o, *alpha_bar, white, white, black, black);
        nk_stroke_line(o, alpha_bar->x-1, line_y, alpha_bar->x + alpha_bar->w + 2,
            line_y, 1, nk_rgb(255,255,255));
    }

    /* draw color matrix */
    temp = nk_hsv_f(hsva[0], 1.0f, 1.0f);
    nk_fill_rect_multi_color(o, *matrix, white, temp, temp, white);
    nk_fill_rect_multi_color(o, *matrix, black_trans, black_trans, black, black);

    /* draw cross-hair */
    {struct nk_vec2 p; float S = hsva[1]; float V = hsva[2];
    p.x = (float)(int)(matrix->x + S * matrix->w);
    p.y = (float)(int)(matrix->y + (1.0f - V) * matrix->h);
    nk_stroke_line(o, p.x - crosshair_size, p.y, p.x-2, p.y, 1.0f, white);
    nk_stroke_line(o, p.x + crosshair_size + 1, p.y, p.x+3, p.y, 1.0f, white);
    nk_stroke_line(o, p.x, p.y + crosshair_size + 1, p.x, p.y+3, 1.0f, white);
    nk_stroke_line(o, p.x, p.y - crosshair_size, p.x, p.y-2, 1.0f, white);}
}

NK_INTERN int
nk_do_color_picker(nk_flags *state,
    struct nk_command_buffer *out, struct nk_color *color,
    enum nk_color_format fmt, struct nk_rect bounds,
    struct nk_vec2 padding, const struct nk_input *in,
    const struct nk_user_font *font)
{
    int ret = 0;
    struct nk_rect matrix;
    struct nk_rect hue_bar;
    struct nk_rect alpha_bar;
    float bar_w;

    NK_ASSERT(out);
    NK_ASSERT(color);
    NK_ASSERT(state);
    NK_ASSERT(font);
    if (!out || !color || !state || !font)
        return ret;

    bar_w = font->height;
    bounds.x += padding.x;
    bounds.y += padding.x;
    bounds.w -= 2 * padding.x;
    bounds.h -= 2 * padding.y;

    matrix.x = bounds.x;
    matrix.y = bounds.y;
    matrix.h = bounds.h;
    matrix.w = bounds.w - (3 * padding.x + 2 * bar_w);

    hue_bar.w = bar_w;
    hue_bar.y = bounds.y;
    hue_bar.h = matrix.h;
    hue_bar.x = matrix.x + matrix.w + padding.x;

    alpha_bar.x = hue_bar.x + hue_bar.w + padding.x;
    alpha_bar.y = bounds.y;
    alpha_bar.w = bar_w;
    alpha_bar.h = matrix.h;

    ret = nk_color_picker_behavior(state, &bounds, &matrix, &hue_bar,
        (fmt == NK_RGBA) ? &alpha_bar:0, color, in);
    nk_draw_color_picker(out, &matrix, &hue_bar, (fmt == NK_RGBA) ? &alpha_bar:0, *color);
    return ret;
}

/* ==============================================================
 *
 *                          STYLE
 *
 * ===============================================================*/
NK_API void nk_style_default(struct nk_context *ctx){nk_style_from_table(ctx, 0);}
#define NK_COLOR_MAP(NK_COLOR)\
    NK_COLOR(NK_COLOR_TEXT,                 175,175,175,255) \
    NK_COLOR(NK_COLOR_WINDOW,               45, 45, 45, 255) \
    NK_COLOR(NK_COLOR_HEADER,               40, 40, 40, 255) \
    NK_COLOR(NK_COLOR_BORDER,               65, 65, 65, 255) \
    NK_COLOR(NK_COLOR_BUTTON,               50, 50, 50, 255) \
    NK_COLOR(NK_COLOR_BUTTON_HOVER,         40, 40, 40, 255) \
    NK_COLOR(NK_COLOR_BUTTON_ACTIVE,        35, 35, 35, 255) \
    NK_COLOR(NK_COLOR_TOGGLE,               100,100,100,255) \
    NK_COLOR(NK_COLOR_TOGGLE_HOVER,         120,120,120,255) \
    NK_COLOR(NK_COLOR_TOGGLE_CURSOR,        45, 45, 45, 255) \
    NK_COLOR(NK_COLOR_SELECT,               45, 45, 45, 255) \
    NK_COLOR(NK_COLOR_SELECT_ACTIVE,        35, 35, 35,255) \
    NK_COLOR(NK_COLOR_SLIDER,               38, 38, 38, 255) \
    NK_COLOR(NK_COLOR_SLIDER_CURSOR,        100,100,100,255) \
    NK_COLOR(NK_COLOR_SLIDER_CURSOR_HOVER,  120,120,120,255) \
    NK_COLOR(NK_COLOR_SLIDER_CURSOR_ACTIVE, 150,150,150,255) \
    NK_COLOR(NK_COLOR_PROPERTY,             38, 38, 38, 255) \
    NK_COLOR(NK_COLOR_EDIT,                 38, 38, 38, 255)  \
    NK_COLOR(NK_COLOR_EDIT_CURSOR,          175,175,175,255) \
    NK_COLOR(NK_COLOR_COMBO,                45, 45, 45, 255) \
    NK_COLOR(NK_COLOR_CHART,                120,120,120,255) \
    NK_COLOR(NK_COLOR_CHART_COLOR,          45, 45, 45, 255) \
    NK_COLOR(NK_COLOR_CHART_COLOR_HIGHLIGHT,255, 0,  0, 255) \
    NK_COLOR(NK_COLOR_SCROLLBAR,            40, 40, 40, 255) \
    NK_COLOR(NK_COLOR_SCROLLBAR_CURSOR,     100,100,100,255) \
    NK_COLOR(NK_COLOR_SCROLLBAR_CURSOR_HOVER,120,120,120,255) \
    NK_COLOR(NK_COLOR_SCROLLBAR_CURSOR_ACTIVE,150,150,150,255) \
    NK_COLOR(NK_COLOR_TAB_HEADER,           40, 40, 40,255)

NK_GLOBAL const struct nk_color
nk_default_color_style[NK_COLOR_COUNT] = {
#define NK_COLOR(a,b,c,d,e) {b,c,d,e},
    NK_COLOR_MAP(NK_COLOR)
#undef NK_COLOR
};

NK_GLOBAL const char *nk_color_names[NK_COLOR_COUNT] = {
#define NK_COLOR(a,b,c,d,e) #a,
    NK_COLOR_MAP(NK_COLOR)
#undef NK_COLOR
};

NK_API const char *nk_style_get_color_by_name(enum nk_style_colors c)
{return nk_color_names[c];}

NK_API struct nk_style_item nk_style_item_image(struct nk_image img)
{struct nk_style_item i; i.type = NK_STYLE_ITEM_IMAGE; i.data.image = img; return i;}

NK_API struct nk_style_item nk_style_item_color(struct nk_color col)
{struct nk_style_item i; i.type = NK_STYLE_ITEM_COLOR; i.data.color = col; return i;}

NK_API struct nk_style_item nk_style_item_hide(void)
{struct nk_style_item i; i.type = NK_STYLE_ITEM_COLOR; i.data.color = nk_rgba(0,0,0,0); return i;}

NK_API void
nk_style_from_table(struct nk_context *ctx, const struct nk_color *table)
{
    struct nk_style *style;
    struct nk_style_text *text;
    struct nk_style_button *button;
    struct nk_style_toggle *toggle;
    struct nk_style_selectable *select;
    struct nk_style_slider *slider;
    struct nk_style_progress *prog;
    struct nk_style_scrollbar *scroll;
    struct nk_style_edit *edit;
    struct nk_style_property *property;
    struct nk_style_combo *combo;
    struct nk_style_chart *chart;
    struct nk_style_tab *tab;
    struct nk_style_window *win;

    NK_ASSERT(ctx);
    if (!ctx) return;
    style = &ctx->style;
    table = (!table) ? nk_default_color_style: table;

    /* default text */
    text = &style->text;
    text->color = table[NK_COLOR_TEXT];
    text->padding = nk_vec2(0,0);

    /* default button */
    button = &style->button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_BUTTON]);
    button->hover           = nk_style_item_color(table[NK_COLOR_BUTTON_HOVER]);
    button->active          = nk_style_item_color(table[NK_COLOR_BUTTON_ACTIVE]);
    button->border_color    = table[NK_COLOR_BORDER];
    button->text_background = table[NK_COLOR_BUTTON];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(2.0f,2.0f);
    button->image_padding   = nk_vec2(0.0f,0.0f);
    button->touch_padding   = nk_vec2(0.0f, 0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 1.0f;
    button->rounding        = 4.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;

    /* contextual button */
    button = &style->contextual_button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_WINDOW]);
    button->hover           = nk_style_item_color(table[NK_COLOR_BUTTON_HOVER]);
    button->active          = nk_style_item_color(table[NK_COLOR_BUTTON_ACTIVE]);
    button->border_color    = table[NK_COLOR_WINDOW];
    button->text_background = table[NK_COLOR_WINDOW];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(2.0f,2.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 0.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;

    /* menu button */
    button = &style->menu_button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_WINDOW]);
    button->hover           = nk_style_item_color(table[NK_COLOR_WINDOW]);
    button->active          = nk_style_item_color(table[NK_COLOR_WINDOW]);
    button->border_color    = table[NK_COLOR_WINDOW];
    button->text_background = table[NK_COLOR_WINDOW];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(2.0f,2.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 0.0f;
    button->rounding        = 1.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;

    /* checkbox toggle */
    toggle = &style->checkbox;
    nk_zero_struct(*toggle);
    toggle->normal          = nk_style_item_color(table[NK_COLOR_TOGGLE]);
    toggle->hover           = nk_style_item_color(table[NK_COLOR_TOGGLE_HOVER]);
    toggle->active          = nk_style_item_color(table[NK_COLOR_TOGGLE_HOVER]);
    toggle->cursor_normal   = nk_style_item_color(table[NK_COLOR_TOGGLE_CURSOR]);
    toggle->cursor_hover    = nk_style_item_color(table[NK_COLOR_TOGGLE_CURSOR]);
    toggle->userdata        = nk_handle_ptr(0);
    toggle->text_background = table[NK_COLOR_WINDOW];
    toggle->text_normal     = table[NK_COLOR_TEXT];
    toggle->text_hover      = table[NK_COLOR_TEXT];
    toggle->text_active     = table[NK_COLOR_TEXT];
    toggle->padding         = nk_vec2(2.0f, 2.0f);
    toggle->touch_padding   = nk_vec2(0,0);
    toggle->border_color    = nk_rgba(0,0,0,0);
    toggle->border          = 0.0f;
    toggle->spacing         = 4;

    /* option toggle */
    toggle = &style->option;
    nk_zero_struct(*toggle);
    toggle->normal          = nk_style_item_color(table[NK_COLOR_TOGGLE]);
    toggle->hover           = nk_style_item_color(table[NK_COLOR_TOGGLE_HOVER]);
    toggle->active          = nk_style_item_color(table[NK_COLOR_TOGGLE_HOVER]);
    toggle->cursor_normal   = nk_style_item_color(table[NK_COLOR_TOGGLE_CURSOR]);
    toggle->cursor_hover    = nk_style_item_color(table[NK_COLOR_TOGGLE_CURSOR]);
    toggle->userdata        = nk_handle_ptr(0);
    toggle->text_background = table[NK_COLOR_WINDOW];
    toggle->text_normal     = table[NK_COLOR_TEXT];
    toggle->text_hover      = table[NK_COLOR_TEXT];
    toggle->text_active     = table[NK_COLOR_TEXT];
    toggle->padding         = nk_vec2(3.0f, 3.0f);
    toggle->touch_padding   = nk_vec2(0,0);
    toggle->border_color    = nk_rgba(0,0,0,0);
    toggle->border          = 0.0f;
    toggle->spacing         = 4;

    /* selectable */
    select = &style->selectable;
    nk_zero_struct(*select);
    select->normal          = nk_style_item_color(table[NK_COLOR_SELECT]);
    select->hover           = nk_style_item_color(table[NK_COLOR_SELECT]);
    select->pressed         = nk_style_item_color(table[NK_COLOR_SELECT]);
    select->normal_active   = nk_style_item_color(table[NK_COLOR_SELECT_ACTIVE]);
    select->hover_active    = nk_style_item_color(table[NK_COLOR_SELECT_ACTIVE]);
    select->pressed_active  = nk_style_item_color(table[NK_COLOR_SELECT_ACTIVE]);
    select->text_normal     = table[NK_COLOR_TEXT];
    select->text_hover      = table[NK_COLOR_TEXT];
    select->text_pressed    = table[NK_COLOR_TEXT];
    select->text_normal_active  = table[NK_COLOR_TEXT];
    select->text_hover_active   = table[NK_COLOR_TEXT];
    select->text_pressed_active = table[NK_COLOR_TEXT];
    select->padding         = nk_vec2(2.0f,2.0f);
    select->touch_padding   = nk_vec2(0,0);
    select->userdata        = nk_handle_ptr(0);
    select->rounding        = 0.0f;
    select->draw_begin      = 0;
    select->draw_end        = 0;

    /* slider */
    slider = &style->slider;
    nk_zero_struct(*slider);
    slider->normal          = nk_style_item_hide();
    slider->hover           = nk_style_item_hide();
    slider->active          = nk_style_item_hide();
    slider->bar_normal      = table[NK_COLOR_SLIDER];
    slider->bar_hover       = table[NK_COLOR_SLIDER];
    slider->bar_active      = table[NK_COLOR_SLIDER];
    slider->bar_filled      = table[NK_COLOR_SLIDER_CURSOR];
    slider->cursor_normal   = nk_style_item_color(table[NK_COLOR_SLIDER_CURSOR]);
    slider->cursor_hover    = nk_style_item_color(table[NK_COLOR_SLIDER_CURSOR_HOVER]);
    slider->cursor_active   = nk_style_item_color(table[NK_COLOR_SLIDER_CURSOR_ACTIVE]);
    slider->inc_symbol      = NK_SYMBOL_TRIANGLE_RIGHT;
    slider->dec_symbol      = NK_SYMBOL_TRIANGLE_LEFT;
    slider->cursor_size     = nk_vec2(16,16);
    slider->padding         = nk_vec2(2,2);
    slider->spacing         = nk_vec2(2,2);
    slider->userdata        = nk_handle_ptr(0);
    slider->show_buttons    = nk_false;
    slider->bar_height      = 8;
    slider->rounding        = 0;
    slider->draw_begin      = 0;
    slider->draw_end        = 0;

    /* slider buttons */
    button = &style->slider.inc_button;
    button->normal          = nk_style_item_color(nk_rgb(40,40,40));
    button->hover           = nk_style_item_color(nk_rgb(42,42,42));
    button->active          = nk_style_item_color(nk_rgb(44,44,44));
    button->border_color    = nk_rgb(65,65,65);
    button->text_background = nk_rgb(40,40,40);
    button->text_normal     = nk_rgb(175,175,175);
    button->text_hover      = nk_rgb(175,175,175);
    button->text_active     = nk_rgb(175,175,175);
    button->padding         = nk_vec2(8.0f,8.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 1.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;
    style->slider.dec_button = style->slider.inc_button;

    /* progressbar */
    prog = &style->progress;
    nk_zero_struct(*prog);
    prog->normal            = nk_style_item_color(table[NK_COLOR_SLIDER]);
    prog->hover             = nk_style_item_color(table[NK_COLOR_SLIDER]);
    prog->active            = nk_style_item_color(table[NK_COLOR_SLIDER]);
    prog->cursor_normal     = nk_style_item_color(table[NK_COLOR_SLIDER_CURSOR]);
    prog->cursor_hover      = nk_style_item_color(table[NK_COLOR_SLIDER_CURSOR_HOVER]);
    prog->cursor_active     = nk_style_item_color(table[NK_COLOR_SLIDER_CURSOR_ACTIVE]);
    prog->border_color      = nk_rgba(0,0,0,0);
    prog->cursor_border_color = nk_rgba(0,0,0,0);
    prog->userdata          = nk_handle_ptr(0);
    prog->padding           = nk_vec2(4,4);
    prog->rounding          = 0;
    prog->border            = 0;
    prog->cursor_rounding   = 0;
    prog->cursor_border     = 0;
    prog->draw_begin        = 0;
    prog->draw_end          = 0;

    /* scrollbars */
    scroll = &style->scrollh;
    nk_zero_struct(*scroll);
    scroll->normal          = nk_style_item_color(table[NK_COLOR_SCROLLBAR]);
    scroll->hover           = nk_style_item_color(table[NK_COLOR_SCROLLBAR]);
    scroll->active          = nk_style_item_color(table[NK_COLOR_SCROLLBAR]);
    scroll->cursor_normal   = nk_style_item_color(table[NK_COLOR_SCROLLBAR_CURSOR]);
    scroll->cursor_hover    = nk_style_item_color(table[NK_COLOR_SCROLLBAR_CURSOR_HOVER]);
    scroll->cursor_active   = nk_style_item_color(table[NK_COLOR_SCROLLBAR_CURSOR_ACTIVE]);
    scroll->dec_symbol      = NK_SYMBOL_CIRCLE_SOLID;
    scroll->inc_symbol      = NK_SYMBOL_CIRCLE_SOLID;
    scroll->userdata        = nk_handle_ptr(0);
    scroll->border_color    = table[NK_COLOR_SCROLLBAR];
    scroll->cursor_border_color = table[NK_COLOR_SCROLLBAR];
    scroll->padding         = nk_vec2(0,0);
    scroll->show_buttons    = nk_false;
    scroll->border          = 0;
    scroll->rounding        = 0;
    scroll->border_cursor   = 0;
    scroll->rounding_cursor = 0;
    scroll->draw_begin      = 0;
    scroll->draw_end        = 0;
    style->scrollv = style->scrollh;

    /* scrollbars buttons */
    button = &style->scrollh.inc_button;
    button->normal          = nk_style_item_color(nk_rgb(40,40,40));
    button->hover           = nk_style_item_color(nk_rgb(42,42,42));
    button->active          = nk_style_item_color(nk_rgb(44,44,44));
    button->border_color    = nk_rgb(65,65,65);
    button->text_background = nk_rgb(40,40,40);
    button->text_normal     = nk_rgb(175,175,175);
    button->text_hover      = nk_rgb(175,175,175);
    button->text_active     = nk_rgb(175,175,175);
    button->padding         = nk_vec2(4.0f,4.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 1.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;
    style->scrollh.dec_button = style->scrollh.inc_button;
    style->scrollv.inc_button = style->scrollh.inc_button;
    style->scrollv.dec_button = style->scrollh.inc_button;

    /* edit */
    edit = &style->edit;
    nk_zero_struct(*edit);
    edit->normal            = nk_style_item_color(table[NK_COLOR_EDIT]);
    edit->hover             = nk_style_item_color(table[NK_COLOR_EDIT]);
    edit->active            = nk_style_item_color(table[NK_COLOR_EDIT]);
    edit->cursor_normal     = table[NK_COLOR_TEXT];
    edit->cursor_hover      = table[NK_COLOR_TEXT];
    edit->cursor_text_normal= table[NK_COLOR_EDIT];
    edit->cursor_text_hover = table[NK_COLOR_EDIT];
    edit->border_color      = table[NK_COLOR_BORDER];
    edit->text_normal       = table[NK_COLOR_TEXT];
    edit->text_hover        = table[NK_COLOR_TEXT];
    edit->text_active       = table[NK_COLOR_TEXT];
    edit->selected_normal   = table[NK_COLOR_TEXT];
    edit->selected_hover    = table[NK_COLOR_TEXT];
    edit->selected_text_normal  = table[NK_COLOR_EDIT];
    edit->selected_text_hover   = table[NK_COLOR_EDIT];
    edit->scrollbar_size    = nk_vec2(10,10);
    edit->scrollbar         = style->scrollv;
    edit->padding           = nk_vec2(4,4);
    edit->row_padding       = 2;
    edit->cursor_size       = 4;
    edit->border            = 1;
    edit->rounding          = 0;

    /* property */
    property = &style->property;
    nk_zero_struct(*property);
    property->normal        = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    property->hover         = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    property->active        = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    property->border_color  = table[NK_COLOR_BORDER];
    property->label_normal  = table[NK_COLOR_TEXT];
    property->label_hover   = table[NK_COLOR_TEXT];
    property->label_active  = table[NK_COLOR_TEXT];
    property->sym_left      = NK_SYMBOL_TRIANGLE_LEFT;
    property->sym_right     = NK_SYMBOL_TRIANGLE_RIGHT;
    property->userdata      = nk_handle_ptr(0);
    property->padding       = nk_vec2(4,4);
    property->border        = 1;
    property->rounding      = 10;
    property->draw_begin    = 0;
    property->draw_end      = 0;

    /* property buttons */
    button = &style->property.dec_button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    button->hover           = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    button->active          = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    button->border_color    = nk_rgba(0,0,0,0);
    button->text_background = table[NK_COLOR_PROPERTY];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(0.0f,0.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 0.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;
    style->property.inc_button = style->property.dec_button;

    /* property edit */
    edit = &style->property.edit;
    nk_zero_struct(*edit);
    edit->normal            = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    edit->hover             = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    edit->active            = nk_style_item_color(table[NK_COLOR_PROPERTY]);
    edit->border_color      = nk_rgba(0,0,0,0);
    edit->cursor_normal     = table[NK_COLOR_TEXT];
    edit->cursor_hover      = table[NK_COLOR_TEXT];
    edit->cursor_text_normal= table[NK_COLOR_EDIT];
    edit->cursor_text_hover = table[NK_COLOR_EDIT];
    edit->text_normal       = table[NK_COLOR_TEXT];
    edit->text_hover        = table[NK_COLOR_TEXT];
    edit->text_active       = table[NK_COLOR_TEXT];
    edit->selected_normal   = table[NK_COLOR_TEXT];
    edit->selected_hover    = table[NK_COLOR_TEXT];
    edit->selected_text_normal  = table[NK_COLOR_EDIT];
    edit->selected_text_hover   = table[NK_COLOR_EDIT];
    edit->padding           = nk_vec2(0,0);
    edit->cursor_size       = 8;
    edit->border            = 0;
    edit->rounding          = 0;

    /* chart */
    chart = &style->chart;
    nk_zero_struct(*chart);
    chart->background       = nk_style_item_color(table[NK_COLOR_CHART]);
    chart->border_color     = table[NK_COLOR_BORDER];
    chart->selected_color   = table[NK_COLOR_CHART_COLOR_HIGHLIGHT];
    chart->color            = table[NK_COLOR_CHART_COLOR];
    chart->padding          = nk_vec2(4,4);
    chart->border           = 0;
    chart->rounding         = 0;

    /* combo */
    combo = &style->combo;
    combo->normal           = nk_style_item_color(table[NK_COLOR_COMBO]);
    combo->hover            = nk_style_item_color(table[NK_COLOR_COMBO]);
    combo->active           = nk_style_item_color(table[NK_COLOR_COMBO]);
    combo->border_color     = table[NK_COLOR_BORDER];
    combo->label_normal     = table[NK_COLOR_TEXT];
    combo->label_hover      = table[NK_COLOR_TEXT];
    combo->label_active     = table[NK_COLOR_TEXT];
    combo->sym_normal       = NK_SYMBOL_TRIANGLE_DOWN;
    combo->sym_hover        = NK_SYMBOL_TRIANGLE_DOWN;
    combo->sym_active       = NK_SYMBOL_TRIANGLE_DOWN;
    combo->content_padding  = nk_vec2(4,4);
    combo->button_padding   = nk_vec2(0,4);
    combo->spacing          = nk_vec2(4,0);
    combo->border           = 1;
    combo->rounding         = 0;

    /* combo button */
    button = &style->combo.button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_COMBO]);
    button->hover           = nk_style_item_color(table[NK_COLOR_COMBO]);
    button->active          = nk_style_item_color(table[NK_COLOR_COMBO]);
    button->border_color    = nk_rgba(0,0,0,0);
    button->text_background = table[NK_COLOR_COMBO];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(2.0f,2.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 0.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;

    /* tab */
    tab = &style->tab;
    tab->background         = nk_style_item_color(table[NK_COLOR_TAB_HEADER]);
    tab->border_color       = table[NK_COLOR_BORDER];
    tab->text               = table[NK_COLOR_TEXT];
    tab->sym_minimize       = NK_SYMBOL_TRIANGLE_RIGHT;
    tab->sym_maximize       = NK_SYMBOL_TRIANGLE_DOWN;
    tab->padding            = nk_vec2(4,4);
    tab->spacing            = nk_vec2(4,4);
    tab->indent             = 10.0f;
    tab->border             = 1;
    tab->rounding           = 0;

    /* tab button */
    button = &style->tab.tab_minimize_button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_TAB_HEADER]);
    button->hover           = nk_style_item_color(table[NK_COLOR_TAB_HEADER]);
    button->active          = nk_style_item_color(table[NK_COLOR_TAB_HEADER]);
    button->border_color    = nk_rgba(0,0,0,0);
    button->text_background = table[NK_COLOR_TAB_HEADER];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(2.0f,2.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 0.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;
    style->tab.tab_maximize_button =*button;

    /* node button */
    button = &style->tab.node_minimize_button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_WINDOW]);
    button->hover           = nk_style_item_color(table[NK_COLOR_WINDOW]);
    button->active          = nk_style_item_color(table[NK_COLOR_WINDOW]);
    button->border_color    = nk_rgba(0,0,0,0);
    button->text_background = table[NK_COLOR_TAB_HEADER];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(2.0f,2.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 0.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;
    style->tab.node_maximize_button =*button;

    /* window header */
    win = &style->window;
    win->header.align = NK_HEADER_RIGHT;
    win->header.close_symbol = NK_SYMBOL_X;
    win->header.minimize_symbol = NK_SYMBOL_MINUS;
    win->header.maximize_symbol = NK_SYMBOL_PLUS;
    win->header.normal = nk_style_item_color(table[NK_COLOR_HEADER]);
    win->header.hover = nk_style_item_color(table[NK_COLOR_HEADER]);
    win->header.active = nk_style_item_color(table[NK_COLOR_HEADER]);
    win->header.label_normal = table[NK_COLOR_TEXT];
    win->header.label_hover = table[NK_COLOR_TEXT];
    win->header.label_active = table[NK_COLOR_TEXT];
    win->header.label_padding = nk_vec2(4,4);
    win->header.padding = nk_vec2(4,4);
    win->header.spacing = nk_vec2(0,0);

    /* window header close button */
    button = &style->window.header.close_button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_HEADER]);
    button->hover           = nk_style_item_color(table[NK_COLOR_HEADER]);
    button->active          = nk_style_item_color(table[NK_COLOR_HEADER]);
    button->border_color    = nk_rgba(0,0,0,0);
    button->text_background = table[NK_COLOR_HEADER];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(0.0f,0.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 0.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;

    /* window header minimize button */
    button = &style->window.header.minimize_button;
    nk_zero_struct(*button);
    button->normal          = nk_style_item_color(table[NK_COLOR_HEADER]);
    button->hover           = nk_style_item_color(table[NK_COLOR_HEADER]);
    button->active          = nk_style_item_color(table[NK_COLOR_HEADER]);
    button->border_color    = nk_rgba(0,0,0,0);
    button->text_background = table[NK_COLOR_HEADER];
    button->text_normal     = table[NK_COLOR_TEXT];
    button->text_hover      = table[NK_COLOR_TEXT];
    button->text_active     = table[NK_COLOR_TEXT];
    button->padding         = nk_vec2(0.0f,0.0f);
    button->touch_padding   = nk_vec2(0.0f,0.0f);
    button->userdata        = nk_handle_ptr(0);
    button->text_alignment  = NK_TEXT_CENTERED;
    button->border          = 0.0f;
    button->rounding        = 0.0f;
    button->draw_begin      = 0;
    button->draw_end        = 0;

    /* window */
    win->background = table[NK_COLOR_WINDOW];
    win->fixed_background = nk_style_item_color(table[NK_COLOR_WINDOW]);
    win->border_color = table[NK_COLOR_BORDER];
    win->popup_border_color = table[NK_COLOR_BORDER];
    win->combo_border_color = table[NK_COLOR_BORDER];
    win->contextual_border_color = table[NK_COLOR_BORDER];
    win->menu_border_color = table[NK_COLOR_BORDER];
    win->group_border_color = table[NK_COLOR_BORDER];
    win->tooltip_border_color = table[NK_COLOR_BORDER];
    win->scaler = nk_style_item_color(table[NK_COLOR_TEXT]);

    win->rounding = 0.0f;
    win->spacing = nk_vec2(4,4);
    win->scrollbar_size = nk_vec2(10,10);
    win->min_size = nk_vec2(64,64);

    win->combo_border = 1.0f;
    win->contextual_border = 1.0f;
    win->menu_border = 1.0f;
    win->group_border = 1.0f;
    win->tooltip_border = 1.0f;
    win->popup_border = 1.0f;
    win->border = 2.0f;
    win->min_row_height_padding = 8;

    win->padding = nk_vec2(4,4);
    win->group_padding = nk_vec2(4,4);
    win->popup_padding = nk_vec2(4,4);
    win->combo_padding = nk_vec2(4,4);
    win->contextual_padding = nk_vec2(4,4);
    win->menu_padding = nk_vec2(4,4);
    win->tooltip_padding = nk_vec2(4,4);
}

NK_API void
nk_style_set_font(struct nk_context *ctx, const struct nk_user_font *font)
{
    struct nk_style *style;
    NK_ASSERT(ctx);

    if (!ctx) return;
    style = &ctx->style;
    style->font = font;
    ctx->stacks.fonts.head = 0;
    if (ctx->current)
        nk_layout_reset_min_row_height(ctx);
}

NK_API int
nk_style_push_font(struct nk_context *ctx, const struct nk_user_font *font)
{
    struct nk_config_stack_user_font *font_stack;
    struct nk_config_stack_user_font_element *element;

    NK_ASSERT(ctx);
    if (!ctx) return 0;

    font_stack = &ctx->stacks.fonts;
    NK_ASSERT(font_stack->head < (int)NK_LEN(font_stack->elements));
    if (font_stack->head >= (int)NK_LEN(font_stack->elements))
        return 0;

    element = &font_stack->elements[font_stack->head++];
    element->address = &ctx->style.font;
    element->old_value = ctx->style.font;
    ctx->style.font = font;
    return 1;
}

NK_API int
nk_style_pop_font(struct nk_context *ctx)
{
    struct nk_config_stack_user_font *font_stack;
    struct nk_config_stack_user_font_element *element;

    NK_ASSERT(ctx);
    if (!ctx) return 0;

    font_stack = &ctx->stacks.fonts;
    NK_ASSERT(font_stack->head > 0);
    if (font_stack->head < 1)
        return 0;

    element = &font_stack->elements[--font_stack->head];
    *element->address = element->old_value;
    return 1;
}

#define NK_STYLE_PUSH_IMPLEMENATION(prefix, type, stack) \
nk_style_push_##type(struct nk_context *ctx, prefix##_##type *address, prefix##_##type value)\
{\
    struct nk_config_stack_##type * type_stack;\
    struct nk_config_stack_##type##_element *element;\
    NK_ASSERT(ctx);\
    if (!ctx) return 0;\
    type_stack = &ctx->stacks.stack;\
    NK_ASSERT(type_stack->head < (int)NK_LEN(type_stack->elements));\
    if (type_stack->head >= (int)NK_LEN(type_stack->elements))\
        return 0;\
    element = &type_stack->elements[type_stack->head++];\
    element->address = address;\
    element->old_value = *address;\
    *address = value;\
    return 1;\
}

#define NK_STYLE_POP_IMPLEMENATION(type, stack) \
nk_style_pop_##type(struct nk_context *ctx)\
{\
    struct nk_config_stack_##type *type_stack;\
    struct nk_config_stack_##type##_element *element;\
    NK_ASSERT(ctx);\
    if (!ctx) return 0;\
    type_stack = &ctx->stacks.stack;\
    NK_ASSERT(type_stack->head > 0);\
    if (type_stack->head < 1)\
        return 0;\
    element = &type_stack->elements[--type_stack->head];\
    *element->address = element->old_value;\
    return 1;\
}

NK_API int NK_STYLE_PUSH_IMPLEMENATION(struct nk, style_item, style_items)
NK_API int NK_STYLE_PUSH_IMPLEMENATION(nk,float, floats)
NK_API int NK_STYLE_PUSH_IMPLEMENATION(struct nk, vec2, vectors)
NK_API int NK_STYLE_PUSH_IMPLEMENATION(nk,flags, flags)
NK_API int NK_STYLE_PUSH_IMPLEMENATION(struct nk,color, colors)

NK_API int NK_STYLE_POP_IMPLEMENATION(style_item, style_items)
NK_API int NK_STYLE_POP_IMPLEMENATION(float,floats)
NK_API int NK_STYLE_POP_IMPLEMENATION(vec2, vectors)
NK_API int NK_STYLE_POP_IMPLEMENATION(flags,flags)
NK_API int NK_STYLE_POP_IMPLEMENATION(color,colors)

NK_API int
nk_style_set_cursor(struct nk_context *ctx, enum nk_style_cursor c)
{
    struct nk_style *style;
    NK_ASSERT(ctx);
    if (!ctx) return 0;
    style = &ctx->style;
    if (style->cursors[c]) {
        style->cursor_active = style->cursors[c];
        return 1;
    }
    return 0;
}

NK_API void
nk_style_show_cursor(struct nk_context *ctx)
{
    ctx->style.cursor_visible = nk_true;
}

NK_API void
nk_style_hide_cursor(struct nk_context *ctx)
{
    ctx->style.cursor_visible = nk_false;
}

NK_API void
nk_style_load_cursor(struct nk_context *ctx, enum nk_style_cursor cursor,
    const struct nk_cursor *c)
{
    struct nk_style *style;
    NK_ASSERT(ctx);
    if (!ctx) return;
    style = &ctx->style;
    style->cursors[cursor] = c;
}

NK_API void
nk_style_load_all_cursors(struct nk_context *ctx, struct nk_cursor *cursors)
{
    int i = 0;
    struct nk_style *style;
    NK_ASSERT(ctx);
    if (!ctx) return;
    style = &ctx->style;
    for (i = 0; i < NK_CURSOR_COUNT; ++i)
        style->cursors[i] = &cursors[i];
    style->cursor_visible = nk_true;
}

/* ===============================================================
 *
 *                          POOL
 *
 * ===============================================================*/
NK_INTERN void
nk_pool_init(struct nk_pool *pool, struct nk_allocator *alloc,
    unsigned int capacity)
{
    nk_zero(pool, sizeof(*pool));
    pool->alloc = *alloc;
    pool->capacity = capacity;
    pool->type = NK_BUFFER_DYNAMIC;
    pool->pages = 0;
}

NK_INTERN void
nk_pool_free(struct nk_pool *pool)
{
    struct nk_page *iter = pool->pages;
    if (!pool) return;
    if (pool->type == NK_BUFFER_FIXED) return;
    while (iter) {
        struct nk_page *next = iter->next;
        pool->alloc.free(pool->alloc.userdata, iter);
        iter = next;
    }
}

NK_INTERN void
nk_pool_init_fixed(struct nk_pool *pool, void *memory, nk_size size)
{
    nk_zero(pool, sizeof(*pool));
    NK_ASSERT(size >= sizeof(struct nk_page));
    if (size < sizeof(struct nk_page)) return;
    pool->capacity = (unsigned)(size - sizeof(struct nk_page)) / sizeof(struct nk_page_element);
    pool->pages = (struct nk_page*)memory;
    pool->type = NK_BUFFER_FIXED;
    pool->size = size;
}

NK_INTERN struct nk_page_element*
nk_pool_alloc(struct nk_pool *pool)
{
    if (!pool->pages || pool->pages->size >= pool->capacity) {
        /* allocate new page */
        struct nk_page *page;
        if (pool->type == NK_BUFFER_FIXED) {
            if (!pool->pages) {
                NK_ASSERT(pool->pages);
                return 0;
            }
            NK_ASSERT(pool->pages->size < pool->capacity);
            return 0;
        } else {
            nk_size size = sizeof(struct nk_page);
            size += NK_POOL_DEFAULT_CAPACITY * sizeof(union nk_page_data);
            page = (struct nk_page*)pool->alloc.alloc(pool->alloc.userdata,0, size);
            page->next = pool->pages;
            pool->pages = page;
            page->size = 0;
        }
    }
    return &pool->pages->win[pool->pages->size++];
}

/* ===============================================================
 *
 *                          CONTEXT
 *
 * ===============================================================*/
NK_INTERN void* nk_create_window(struct nk_context *ctx);
NK_INTERN void nk_remove_window(struct nk_context*, struct nk_window*);
NK_INTERN void nk_free_window(struct nk_context *ctx, struct nk_window *win);
NK_INTERN void nk_free_table(struct nk_context *ctx, struct nk_table *tbl);
NK_INTERN void nk_remove_table(struct nk_window *win, struct nk_table *tbl);
NK_INTERN void* nk_create_panel(struct nk_context *ctx);
NK_INTERN void nk_free_panel(struct nk_context*, struct nk_panel *pan);

NK_INTERN void
nk_setup(struct nk_context *ctx, const struct nk_user_font *font)
{
    NK_ASSERT(ctx);
    if (!ctx) return;
    nk_zero_struct(*ctx);
    nk_style_default(ctx);
    ctx->seq = 1;
    if (font) ctx->style.font = font;
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
    nk_draw_list_init(&ctx->draw_list);
#endif
}

#ifdef NK_INCLUDE_DEFAULT_ALLOCATOR
NK_API int
nk_init_default(struct nk_context *ctx, const struct nk_user_font *font)
{
    struct nk_allocator alloc;
    alloc.userdata.ptr = 0;
    alloc.alloc = nk_malloc;
    alloc.free = nk_mfree;
    return nk_init(ctx, &alloc, font);
}
#endif

NK_API int
nk_init_fixed(struct nk_context *ctx, void *memory, nk_size size,
    const struct nk_user_font *font)
{
    NK_ASSERT(memory);
    if (!memory) return 0;
    nk_setup(ctx, font);
    nk_buffer_init_fixed(&ctx->memory, memory, size);
    ctx->use_pool = nk_false;
    return 1;
}

NK_API int
nk_init_custom(struct nk_context *ctx, struct nk_buffer *cmds,
    struct nk_buffer *pool, const struct nk_user_font *font)
{
    NK_ASSERT(cmds);
    NK_ASSERT(pool);
    if (!cmds || !pool) return 0;

    nk_setup(ctx, font);
    ctx->memory = *cmds;
    if (pool->type == NK_BUFFER_FIXED) {
        /* take memory from buffer and alloc fixed pool */
        nk_pool_init_fixed(&ctx->pool, pool->memory.ptr, pool->memory.size);
    } else {
        /* create dynamic pool from buffer allocator */
        struct nk_allocator *alloc = &pool->pool;
        nk_pool_init(&ctx->pool, alloc, NK_POOL_DEFAULT_CAPACITY);
    }
    ctx->use_pool = nk_true;
    return 1;
}

NK_API int
nk_init(struct nk_context *ctx, struct nk_allocator *alloc,
    const struct nk_user_font *font)
{
    NK_ASSERT(alloc);
    if (!alloc) return 0;
    nk_setup(ctx, font);
    nk_buffer_init(&ctx->memory, alloc, NK_DEFAULT_COMMAND_BUFFER_SIZE);
    nk_pool_init(&ctx->pool, alloc, NK_POOL_DEFAULT_CAPACITY);
    ctx->use_pool = nk_true;
    return 1;
}

#ifdef NK_INCLUDE_COMMAND_USERDATA
NK_API void
nk_set_user_data(struct nk_context *ctx, nk_handle handle)
{
    if (!ctx) return;
    ctx->userdata = handle;
    if (ctx->current)
        ctx->current->buffer.userdata = handle;
}
#endif

NK_API void
nk_free(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    if (!ctx) return;
    nk_buffer_free(&ctx->memory);
    if (ctx->use_pool)
        nk_pool_free(&ctx->pool);

    nk_zero(&ctx->input, sizeof(ctx->input));
    nk_zero(&ctx->style, sizeof(ctx->style));
    nk_zero(&ctx->memory, sizeof(ctx->memory));

    ctx->seq = 0;
    ctx->build = 0;
    ctx->begin = 0;
    ctx->end = 0;
    ctx->active = 0;
    ctx->current = 0;
    ctx->freelist = 0;
    ctx->count = 0;
}

NK_API void
nk_clear(struct nk_context *ctx)
{
    struct nk_window *iter;
    struct nk_window *next;
    NK_ASSERT(ctx);

    if (!ctx) return;
    if (ctx->use_pool)
        nk_buffer_clear(&ctx->memory);
    else nk_buffer_reset(&ctx->memory, NK_BUFFER_FRONT);

    ctx->build = 0;
    ctx->memory.calls = 0;
    ctx->last_widget_state = 0;
    ctx->style.cursor_active = ctx->style.cursors[NK_CURSOR_ARROW];
    NK_MEMSET(&ctx->overlay, 0, sizeof(ctx->overlay));
#ifdef NK_INCLUDE_VERTEX_BUFFER_OUTPUT
    nk_draw_list_clear(&ctx->draw_list);
#endif

    /* garbage collector */
    iter = ctx->begin;
    while (iter) {
        /* make sure minimized windows do not get removed */
        if ((iter->flags & NK_WINDOW_MINIMIZED) &&
            !(iter->flags & NK_WINDOW_CLOSED)) {
            iter = iter->next;
            continue;
        }
        /* remove hotness from hidden or closed windows*/
        if (((iter->flags & NK_WINDOW_HIDDEN) ||
            (iter->flags & NK_WINDOW_CLOSED)) &&
            iter == ctx->active) {
            ctx->active = iter->prev;
            ctx->end = iter->prev;
            if (ctx->active)
                ctx->active->flags &= ~NK_WINDOW_ROM;
        }

        /* free unused popup windows */
        if (iter->popup.win && iter->popup.win->seq != ctx->seq) {
            nk_free_window(ctx, iter->popup.win);
            iter->popup.win = 0;
        }
        /* remove unused window state tables */
        {struct nk_table *n, *it = iter->tables;
        while (it) {
            n = it->next;
            if (it->seq != ctx->seq) {
                nk_remove_table(iter, it);
                nk_zero(it, sizeof(union nk_page_data));
                nk_free_table(ctx, it);
                if (it == iter->tables)
                    iter->tables = n;
            }
            it = n;
        }}
        /* window itself is not used anymore so free */
        if (iter->seq != ctx->seq || iter->flags & NK_WINDOW_CLOSED) {
            next = iter->next;
            nk_remove_window(ctx, iter);
            nk_free_window(ctx, iter);
            iter = next;
        } else iter = iter->next;
    }
    ctx->seq++;
}

/* ----------------------------------------------------------------
 *
 *                          BUFFERING
 *
 * ---------------------------------------------------------------*/
NK_INTERN void
nk_start_buffer(struct nk_context *ctx, struct nk_command_buffer *buffer)
{
    NK_ASSERT(ctx);
    NK_ASSERT(buffer);
    if (!ctx || !buffer) return;
    buffer->begin = ctx->memory.allocated;
    buffer->end = buffer->begin;
    buffer->last = buffer->begin;
    buffer->clip = nk_null_rect;
}

NK_INTERN void
nk_start(struct nk_context *ctx, struct nk_window *win)
{
    NK_ASSERT(ctx);
    NK_ASSERT(win);
    nk_start_buffer(ctx, &win->buffer);
}

NK_INTERN void
nk_start_popup(struct nk_context *ctx, struct nk_window *win)
{
    struct nk_popup_buffer *buf;
    NK_ASSERT(ctx);
    NK_ASSERT(win);
    if (!ctx || !win) return;

    /* save buffer fill state for popup */
    buf = &win->popup.buf;
    buf->begin = win->buffer.end;
    buf->end = win->buffer.end;
    buf->parent = win->buffer.last;
    buf->last = buf->begin;
    buf->active = nk_true;
}

NK_INTERN void
nk_finish_popup(struct nk_context *ctx, struct nk_window *win)
{
    struct nk_popup_buffer *buf;
    NK_ASSERT(ctx);
    NK_ASSERT(win);
    if (!ctx || !win) return;

    buf = &win->popup.buf;
    buf->last = win->buffer.last;
    buf->end = win->buffer.end;
}

NK_INTERN void
nk_finish_buffer(struct nk_context *ctx, struct nk_command_buffer *buffer)
{
    NK_ASSERT(ctx);
    NK_ASSERT(buffer);
    if (!ctx || !buffer) return;
    buffer->end = ctx->memory.allocated;
}

NK_INTERN void
nk_finish(struct nk_context *ctx, struct nk_window *win)
{
    struct nk_popup_buffer *buf;
    struct nk_command *parent_last;
    void *memory;

    NK_ASSERT(ctx);
    NK_ASSERT(win);
    if (!ctx || !win) return;
    nk_finish_buffer(ctx, &win->buffer);
    if (!win->popup.buf.active) return;

    buf = &win->popup.buf;
    memory = ctx->memory.memory.ptr;
    parent_last = nk_ptr_add(struct nk_command, memory, buf->parent);
    parent_last->next = buf->end;
}

NK_INTERN void
nk_build(struct nk_context *ctx)
{
    struct nk_window *iter = 0;
    struct nk_command *cmd = 0;
    nk_byte *buffer = 0;

    /* draw cursor overlay */
    if (!ctx->style.cursor_active)
        ctx->style.cursor_active = ctx->style.cursors[NK_CURSOR_ARROW];
    if (ctx->style.cursor_active && !ctx->input.mouse.grabbed && ctx->style.cursor_visible) {
        struct nk_rect mouse_bounds;
        const struct nk_cursor *cursor = ctx->style.cursor_active;
        nk_command_buffer_init(&ctx->overlay, &ctx->memory, NK_CLIPPING_OFF);
        nk_start_buffer(ctx, &ctx->overlay);

        mouse_bounds.x = ctx->input.mouse.pos.x - cursor->offset.x;
        mouse_bounds.y = ctx->input.mouse.pos.y - cursor->offset.y;
        mouse_bounds.w = cursor->size.x;
        mouse_bounds.h = cursor->size.y;

        nk_draw_image(&ctx->overlay, mouse_bounds, &cursor->img, nk_white);
        nk_finish_buffer(ctx, &ctx->overlay);
    }
    /* build one big draw command list out of all window buffers */
    iter = ctx->begin;
    buffer = (nk_byte*)ctx->memory.memory.ptr;
    while (iter != 0) {
        struct nk_window *next = iter->next;
        if (iter->buffer.last == iter->buffer.begin || (iter->flags & NK_WINDOW_HIDDEN)||
            iter->seq != ctx->seq)
            goto cont;

        cmd = nk_ptr_add(struct nk_command, buffer, iter->buffer.last);
        while (next && ((next->buffer.last == next->buffer.begin) ||
            (next->flags & NK_WINDOW_HIDDEN)))
            next = next->next; /* skip empty command buffers */

        if (next) cmd->next = next->buffer.begin;
        cont: iter = next;
    }
    /* append all popup draw commands into lists */
    iter = ctx->begin;
    while (iter != 0) {
        struct nk_window *next = iter->next;
        struct nk_popup_buffer *buf;
        if (!iter->popup.buf.active)
            goto skip;

        buf = &iter->popup.buf;
        cmd->next = buf->begin;
        cmd = nk_ptr_add(struct nk_command, buffer, buf->last);
        buf->active = nk_false;
        skip: iter = next;
    }
    /* append overlay commands */
    if (cmd) {
        if (ctx->overlay.end != ctx->overlay.begin)
            cmd->next = ctx->overlay.begin;
        else cmd->next = ctx->memory.allocated;
    }
}

NK_API const struct nk_command*
nk__begin(struct nk_context *ctx)
{
    struct nk_window *iter;
    nk_byte *buffer;
    NK_ASSERT(ctx);
    if (!ctx) return 0;
    if (!ctx->count) return 0;

    buffer = (nk_byte*)ctx->memory.memory.ptr;
    if (!ctx->build) {
        nk_build(ctx);
        ctx->build = nk_true;
    }
    iter = ctx->begin;
    while (iter && ((iter->buffer.begin == iter->buffer.end) || (iter->flags & NK_WINDOW_HIDDEN)))
        iter = iter->next;
    if (!iter) return 0;
    return nk_ptr_add_const(struct nk_command, buffer, iter->buffer.begin);
}

NK_API const struct nk_command*
nk__next(struct nk_context *ctx, const struct nk_command *cmd)
{
    nk_byte *buffer;
    const struct nk_command *next;
    NK_ASSERT(ctx);
    if (!ctx || !cmd || !ctx->count) return 0;
    if (cmd->next >= ctx->memory.allocated) return 0;
    buffer = (nk_byte*)ctx->memory.memory.ptr;
    next = nk_ptr_add_const(struct nk_command, buffer, cmd->next);
    return next;
}

/* ----------------------------------------------------------------
 *
 *                          PANEL
 *
 * ---------------------------------------------------------------*/
static int
nk_panel_has_header(nk_flags flags, const char *title)
{
    int active = 0;
    active = (flags & (NK_WINDOW_CLOSABLE|NK_WINDOW_MINIMIZABLE));
    active = active || (flags & NK_WINDOW_TITLE);
    active = active && !(flags & NK_WINDOW_HIDDEN) && title;
    return active;
}

NK_INTERN struct nk_vec2
nk_panel_get_padding(const struct nk_style *style, enum nk_panel_type type)
{
    switch (type) {
    default:
    case NK_PANEL_WINDOW: return style->window.padding;
    case NK_PANEL_GROUP: return style->window.group_padding;
    case NK_PANEL_POPUP: return style->window.popup_padding;
    case NK_PANEL_CONTEXTUAL: return style->window.contextual_padding;
    case NK_PANEL_COMBO: return style->window.combo_padding;
    case NK_PANEL_MENU: return style->window.menu_padding;
    case NK_PANEL_TOOLTIP: return style->window.menu_padding;
    }
}

NK_INTERN float
nk_panel_get_border(const struct nk_style *style, nk_flags flags,
    enum nk_panel_type type)
{
    if (flags & NK_WINDOW_BORDER) {
        switch (type) {
        default:
        case NK_PANEL_WINDOW: return style->window.border;
        case NK_PANEL_GROUP: return style->window.group_border;
        case NK_PANEL_POPUP: return style->window.popup_border;
        case NK_PANEL_CONTEXTUAL: return style->window.contextual_border;
        case NK_PANEL_COMBO: return style->window.combo_border;
        case NK_PANEL_MENU: return style->window.menu_border;
        case NK_PANEL_TOOLTIP: return style->window.menu_border;
    }} else return 0;
}

NK_INTERN struct nk_color
nk_panel_get_border_color(const struct nk_style *style, enum nk_panel_type type)
{
    switch (type) {
    default:
    case NK_PANEL_WINDOW: return style->window.border_color;
    case NK_PANEL_GROUP: return style->window.group_border_color;
    case NK_PANEL_POPUP: return style->window.popup_border_color;
    case NK_PANEL_CONTEXTUAL: return style->window.contextual_border_color;
    case NK_PANEL_COMBO: return style->window.combo_border_color;
    case NK_PANEL_MENU: return style->window.menu_border_color;
    case NK_PANEL_TOOLTIP: return style->window.menu_border_color;
    }
}

NK_INTERN int
nk_panel_is_sub(enum nk_panel_type type)
{
    return (type & NK_PANEL_SET_SUB)?1:0;
}

NK_INTERN int
nk_panel_is_nonblock(enum nk_panel_type type)
{
    return (type & NK_PANEL_SET_NONBLOCK)?1:0;
}

NK_INTERN int
nk_panel_begin(struct nk_context *ctx, const char *title, enum nk_panel_type panel_type)
{
    struct nk_input *in;
    struct nk_window *win;
    struct nk_panel *layout;
    struct nk_command_buffer *out;
    const struct nk_style *style;
    const struct nk_user_font *font;

    struct nk_vec2 scrollbar_size;
    struct nk_vec2 panel_padding;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout) return 0;
    nk_zero(ctx->current->layout, sizeof(*ctx->current->layout));
    if ((ctx->current->flags & NK_WINDOW_HIDDEN) || (ctx->current->flags & NK_WINDOW_CLOSED)) {
        nk_zero(ctx->current->layout, sizeof(struct nk_panel));
        ctx->current->layout->type = panel_type;
        return 0;
    }
    /* pull state into local stack */
    style = &ctx->style;
    font = style->font;
    win = ctx->current;
    layout = win->layout;
    out = &win->buffer;
    in = (win->flags & NK_WINDOW_NO_INPUT) ? 0: &ctx->input;
#ifdef NK_INCLUDE_COMMAND_USERDATA
    win->buffer.userdata = ctx->userdata;
#endif
    /* pull style configuration into local stack */
    scrollbar_size = style->window.scrollbar_size;
    panel_padding = nk_panel_get_padding(style, panel_type);

    /* window movement */
    if ((win->flags & NK_WINDOW_MOVABLE) && !(win->flags & NK_WINDOW_ROM)) {
        int left_mouse_down;
        int left_mouse_click_in_cursor;

        /* calculate draggable window space */
        struct nk_rect header;
        header.x = win->bounds.x;
        header.y = win->bounds.y;
        header.w = win->bounds.w;
        if (nk_panel_has_header(win->flags, title)) {
            header.h = font->height + 2.0f * style->window.header.padding.y;
            header.h += 2.0f * style->window.header.label_padding.y;
        } else header.h = panel_padding.y;

        /* window movement by dragging */
        left_mouse_down = in->mouse.buttons[NK_BUTTON_LEFT].down;
        left_mouse_click_in_cursor = nk_input_has_mouse_click_down_in_rect(in,
            NK_BUTTON_LEFT, header, nk_true);
        if (left_mouse_down && left_mouse_click_in_cursor) {
            win->bounds.x = win->bounds.x + in->mouse.delta.x;
            win->bounds.y = win->bounds.y + in->mouse.delta.y;
            in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.x += in->mouse.delta.x;
            in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.y += in->mouse.delta.y;
            ctx->style.cursor_active = ctx->style.cursors[NK_CURSOR_MOVE];
        }
    }

    /* setup panel */
    layout->type = panel_type;
    layout->flags = win->flags;
    layout->bounds = win->bounds;
    layout->bounds.x += panel_padding.x;
    layout->bounds.w -= 2*panel_padding.x;
    if (win->flags & NK_WINDOW_BORDER) {
        layout->border = nk_panel_get_border(style, win->flags, panel_type);
        layout->bounds = nk_shrink_rect(layout->bounds, layout->border);
    } else layout->border = 0;
    layout->at_y = layout->bounds.y;
    layout->at_x = layout->bounds.x;
    layout->max_x = 0;
    layout->header_height = 0;
    layout->footer_height = 0;
    nk_layout_reset_min_row_height(ctx);
    layout->row.index = 0;
    layout->row.columns = 0;
    layout->row.ratio = 0;
    layout->row.item_width = 0;
    layout->row.tree_depth = 0;
    layout->row.height = panel_padding.y;
    layout->has_scrolling = nk_true;
    if (!(win->flags & NK_WINDOW_NO_SCROLLBAR))
        layout->bounds.w -= scrollbar_size.x;
    if (!nk_panel_is_nonblock(panel_type)) {
        layout->footer_height = 0;
        if (!(win->flags & NK_WINDOW_NO_SCROLLBAR) || win->flags & NK_WINDOW_SCALABLE)
            layout->footer_height = scrollbar_size.y;
        layout->bounds.h -= layout->footer_height;
    }

    /* panel header */
    if (nk_panel_has_header(win->flags, title))
    {
        struct nk_text text;
        struct nk_rect header;
        const struct nk_style_item *background = 0;

        /* calculate header bounds */
        header.x = win->bounds.x;
        header.y = win->bounds.y;
        header.w = win->bounds.w;
        header.h = font->height + 2.0f * style->window.header.padding.y;
        header.h += (2.0f * style->window.header.label_padding.y);

        /* shrink panel by header */
        layout->header_height = header.h;
        layout->bounds.y += header.h;
        layout->bounds.h -= header.h;
        layout->at_y += header.h;

        /* select correct header background and text color */
        if (ctx->active == win) {
            background = &style->window.header.active;
            text.text = style->window.header.label_active;
        } else if (nk_input_is_mouse_hovering_rect(&ctx->input, header)) {
            background = &style->window.header.hover;
            text.text = style->window.header.label_hover;
        } else {
            background = &style->window.header.normal;
            text.text = style->window.header.label_normal;
        }

        /* draw header background */
        header.h += 1.0f;
        if (background->type == NK_STYLE_ITEM_IMAGE) {
            text.background = nk_rgba(0,0,0,0);
            nk_draw_image(&win->buffer, header, &background->data.image, nk_white);
        } else {
            text.background = background->data.color;
            nk_fill_rect(out, header, 0, background->data.color);
        }

        /* window close button */
        {struct nk_rect button;
        button.y = header.y + style->window.header.padding.y;
        button.h = header.h - 2 * style->window.header.padding.y;
        button.w = button.h;
        if (win->flags & NK_WINDOW_CLOSABLE) {
            nk_flags ws = 0;
            if (style->window.header.align == NK_HEADER_RIGHT) {
                button.x = (header.w + header.x) - (button.w + style->window.header.padding.x);
                header.w -= button.w + style->window.header.spacing.x + style->window.header.padding.x;
            } else {
                button.x = header.x + style->window.header.padding.x;
                header.x += button.w + style->window.header.spacing.x + style->window.header.padding.x;
            }

            if (nk_do_button_symbol(&ws, &win->buffer, button,
                style->window.header.close_symbol, NK_BUTTON_DEFAULT,
                &style->window.header.close_button, in, style->font) && !(win->flags & NK_WINDOW_ROM))
            {
                layout->flags |= NK_WINDOW_HIDDEN;
                layout->flags &= (nk_flags)~NK_WINDOW_MINIMIZED;
            }
        }

        /* window minimize button */
        if (win->flags & NK_WINDOW_MINIMIZABLE) {
            nk_flags ws = 0;
            if (style->window.header.align == NK_HEADER_RIGHT) {
                button.x = (header.w + header.x) - button.w;
                if (!(win->flags & NK_WINDOW_CLOSABLE)) {
                    button.x -= style->window.header.padding.x;
                    header.w -= style->window.header.padding.x;
                }
                header.w -= button.w + style->window.header.spacing.x;
            } else {
                button.x = header.x;
                header.x += button.w + style->window.header.spacing.x + style->window.header.padding.x;
            }
            if (nk_do_button_symbol(&ws, &win->buffer, button, (layout->flags & NK_WINDOW_MINIMIZED)?
                style->window.header.maximize_symbol: style->window.header.minimize_symbol,
                NK_BUTTON_DEFAULT, &style->window.header.minimize_button, in, style->font) && !(win->flags & NK_WINDOW_ROM))
                layout->flags = (layout->flags & NK_WINDOW_MINIMIZED) ?
                    layout->flags & (nk_flags)~NK_WINDOW_MINIMIZED:
                    layout->flags | NK_WINDOW_MINIMIZED;
        }}

        {/* window header title */
        int text_len = nk_strlen(title);
        struct nk_rect label = {0,0,0,0};
        float t = font->width(font->userdata, font->height, title, text_len);
        text.padding = nk_vec2(0,0);

        label.x = header.x + style->window.header.padding.x;
        label.x += style->window.header.label_padding.x;
        label.y = header.y + style->window.header.label_padding.y;
        label.h = font->height + 2 * style->window.header.label_padding.y;
        label.w = t + 2 * style->window.header.spacing.x;
        label.w = NK_CLAMP(0, label.w, header.x + header.w - label.x);
        nk_widget_text(out, label,(const char*)title, text_len, &text, NK_TEXT_LEFT, font);}
    }

    /* draw window background */
    if (!(layout->flags & NK_WINDOW_MINIMIZED) && !(layout->flags & NK_WINDOW_DYNAMIC)) {
        struct nk_rect body;
        body.x = win->bounds.x;
        body.w = win->bounds.w;
        body.y = (win->bounds.y + layout->header_height);
        body.h = (win->bounds.h - layout->header_height);
        if (style->window.fixed_background.type == NK_STYLE_ITEM_IMAGE)
            nk_draw_image(out, body, &style->window.fixed_background.data.image, nk_white);
        else nk_fill_rect(out, body, 0, style->window.fixed_background.data.color);
    }

    /* set clipping rectangle */
    {struct nk_rect clip;
    layout->clip = layout->bounds;
    nk_unify(&clip, &win->buffer.clip, layout->clip.x, layout->clip.y,
        layout->clip.x + layout->clip.w, layout->clip.y + layout->clip.h);
    nk_push_scissor(out, clip);
    layout->clip = clip;}
    return !(layout->flags & NK_WINDOW_HIDDEN) && !(layout->flags & NK_WINDOW_MINIMIZED);
}

NK_INTERN void
nk_panel_end(struct nk_context *ctx)
{
    struct nk_input *in;
    struct nk_window *window;
    struct nk_panel *layout;
    const struct nk_style *style;
    struct nk_command_buffer *out;

    struct nk_vec2 scrollbar_size;
    struct nk_vec2 panel_padding;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    window = ctx->current;
    layout = window->layout;
    style = &ctx->style;
    out = &window->buffer;
    in = (layout->flags & NK_WINDOW_ROM || layout->flags & NK_WINDOW_NO_INPUT) ? 0 :&ctx->input;
    if (!nk_panel_is_sub(layout->type))
        nk_push_scissor(out, nk_null_rect);

    /* cache configuration data */
    scrollbar_size = style->window.scrollbar_size;
    panel_padding = nk_panel_get_padding(style, layout->type);

    /* update the current cursor Y-position to point over the last added widget */
    layout->at_y += layout->row.height;

    /* dynamic panels */
    if (layout->flags & NK_WINDOW_DYNAMIC && !(layout->flags & NK_WINDOW_MINIMIZED))
    {
        /* update panel height to fit dynamic growth */
        struct nk_rect empty_space;
        if (layout->at_y < (layout->bounds.y + layout->bounds.h))
            layout->bounds.h = layout->at_y - layout->bounds.y;

        /* fill top empty space */
        empty_space.x = window->bounds.x;
        empty_space.y = layout->bounds.y;
        empty_space.h = panel_padding.y;
        empty_space.w = window->bounds.w;
        nk_fill_rect(out, empty_space, 0, style->window.background);

        /* fill left empty space */
        empty_space.x = window->bounds.x;
        empty_space.y = layout->bounds.y;
        empty_space.w = panel_padding.x + layout->border;
        empty_space.h = layout->bounds.h;
        nk_fill_rect(out, empty_space, 0, style->window.background);

        /* fill right empty space */
        empty_space.x = layout->bounds.x + layout->bounds.w - layout->border;
        empty_space.y = layout->bounds.y;
        empty_space.w = panel_padding.x + layout->border;
        empty_space.h = layout->bounds.h;
        if (*layout->offset_y == 0 && !(layout->flags & NK_WINDOW_NO_SCROLLBAR))
            empty_space.w += scrollbar_size.x;
        nk_fill_rect(out, empty_space, 0, style->window.background);

        /* fill bottom empty space */
        if (*layout->offset_x != 0 && !(layout->flags & NK_WINDOW_NO_SCROLLBAR)) {
            empty_space.x = window->bounds.x;
            empty_space.y = layout->bounds.y + layout->bounds.h;
            empty_space.w = window->bounds.w;
            empty_space.h = scrollbar_size.y;
            nk_fill_rect(out, empty_space, 0, style->window.background);
        }
    }

    /* scrollbars */
    if (!(layout->flags & NK_WINDOW_NO_SCROLLBAR) &&
        !(layout->flags & NK_WINDOW_MINIMIZED) &&
        window->scrollbar_hiding_timer < NK_SCROLLBAR_HIDING_TIMEOUT)
    {
        struct nk_rect scroll;
        int scroll_has_scrolling;
        float scroll_target;
        float scroll_offset;
        float scroll_step;
        float scroll_inc;

        /* mouse wheel scrolling */
        if (nk_panel_is_sub(layout->type))
        {
            /* sub-window mouse wheel scrolling */
            struct nk_window *root_window = window;
            struct nk_panel *root_panel = window->layout;
            while (root_panel->parent)
                root_panel = root_panel->parent;
            while (root_window->parent)
                root_window = root_window->parent;

            /* only allow scrolling if parent window is active */
            scroll_has_scrolling = 0;
            if ((root_window == ctx->active) && layout->has_scrolling) {
                /* and panel is being hovered and inside clip rect*/
                if (nk_input_is_mouse_hovering_rect(in, layout->bounds) &&
                    NK_INTERSECT(layout->bounds.x, layout->bounds.y, layout->bounds.w, layout->bounds.h,
                        root_panel->clip.x, root_panel->clip.y, root_panel->clip.w, root_panel->clip.h))
                {
                    /* deactivate all parent scrolling */
                    root_panel = window->layout;
                    while (root_panel->parent) {
                        root_panel->has_scrolling = nk_false;
                        root_panel = root_panel->parent;
                    }
                    root_panel->has_scrolling = nk_false;
                    scroll_has_scrolling = nk_true;
                }
            }
        } else if (!nk_panel_is_sub(layout->type)) {
            /* window mouse wheel scrolling */
            scroll_has_scrolling = (window == ctx->active) && layout->has_scrolling;
            if (in && (in->mouse.scroll_delta.y > 0 || in->mouse.scroll_delta.x > 0) && scroll_has_scrolling)
                window->scrolled = nk_true;
            else window->scrolled = nk_false;
        } else scroll_has_scrolling = nk_false;

        {
            /* vertical scrollbar */
            nk_flags state = 0;
            scroll.x = layout->bounds.x + layout->bounds.w + panel_padding.x;
            scroll.y = layout->bounds.y;
            scroll.w = scrollbar_size.x;
            scroll.h = layout->bounds.h;

            scroll_offset = (float)*layout->offset_y;
            scroll_step = scroll.h * 0.10f;
            scroll_inc = scroll.h * 0.01f;
            scroll_target = (float)(int)(layout->at_y - scroll.y);
            scroll_offset = nk_do_scrollbarv(&state, out, scroll, scroll_has_scrolling,
                scroll_offset, scroll_target, scroll_step, scroll_inc,
                &ctx->style.scrollv, in, style->font);
            *layout->offset_y = (nk_uint)scroll_offset;
            if (in && scroll_has_scrolling)
                in->mouse.scroll_delta.y = 0;
        }
        {
            /* horizontal scrollbar */
            nk_flags state = 0;
            scroll.x = layout->bounds.x;
            scroll.y = layout->bounds.y + layout->bounds.h;
            scroll.w = layout->bounds.w;
            scroll.h = scrollbar_size.y;

            scroll_offset = (float)*layout->offset_x;
            scroll_target = (float)(int)(layout->max_x - scroll.x);
            scroll_step = layout->max_x * 0.05f;
            scroll_inc = layout->max_x * 0.005f;
            scroll_offset = nk_do_scrollbarh(&state, out, scroll, scroll_has_scrolling,
                scroll_offset, scroll_target, scroll_step, scroll_inc,
                &ctx->style.scrollh, in, style->font);
            *layout->offset_x = (nk_uint)scroll_offset;
        }
    }

    /* hide scroll if no user input */
    if (window->flags & NK_WINDOW_SCROLL_AUTO_HIDE) {
        int has_input = ctx->input.mouse.delta.x != 0 || ctx->input.mouse.delta.y != 0 || ctx->input.mouse.scroll_delta.y != 0;
        int is_window_hovered = nk_window_is_hovered(ctx);
        int any_item_active = (ctx->last_widget_state & NK_WIDGET_STATE_MODIFIED);
        if ((!has_input && is_window_hovered) || (!is_window_hovered && !any_item_active))
            window->scrollbar_hiding_timer += ctx->delta_time_seconds;
        else window->scrollbar_hiding_timer = 0;
    } else window->scrollbar_hiding_timer = 0;

    /* window border */
    if (layout->flags & NK_WINDOW_BORDER)
    {
        struct nk_color border_color = nk_panel_get_border_color(style, layout->type);
        const float padding_y = (layout->flags & NK_WINDOW_MINIMIZED) ?
            style->window.border + window->bounds.y + layout->header_height:
            (layout->flags & NK_WINDOW_DYNAMIC)?
            layout->bounds.y + layout->bounds.h + layout->footer_height:
            window->bounds.y + window->bounds.h;

        /* draw border top */
        nk_stroke_line(out,window->bounds.x,window->bounds.y,
            window->bounds.x + window->bounds.w, window->bounds.y,
            layout->border, border_color);

        /* draw bottom border */
        nk_stroke_line(out, window->bounds.x, padding_y,
            window->bounds.x + window->bounds.w, padding_y, layout->border, border_color);

        /* draw left border */
        nk_stroke_line(out, window->bounds.x + layout->border*0.5f,
            window->bounds.y, window->bounds.x + layout->border*0.5f,
            padding_y, layout->border, border_color);

        /* draw right border */
        nk_stroke_line(out, window->bounds.x + window->bounds.w - layout->border*0.5f,
            window->bounds.y, window->bounds.x + window->bounds.w - layout->border*0.5f,
            padding_y, layout->border, border_color);
    }

    /* scaler */
    if ((layout->flags & NK_WINDOW_SCALABLE) && in && !(layout->flags & NK_WINDOW_MINIMIZED))
    {
        /* calculate scaler bounds */
        struct nk_rect scaler;
        scaler.w = scrollbar_size.x;
        scaler.h = scrollbar_size.y;
        scaler.y = layout->bounds.y + layout->bounds.h;
        if (layout->flags & NK_WINDOW_SCALE_LEFT)
            scaler.x = layout->bounds.x - panel_padding.x * 0.5f;
        else scaler.x = layout->bounds.x + layout->bounds.w + panel_padding.x;
        if (layout->flags & NK_WINDOW_NO_SCROLLBAR)
            scaler.x -= scaler.w;

        /* draw scaler */
        {const struct nk_style_item *item = &style->window.scaler;
        if (item->type == NK_STYLE_ITEM_IMAGE)
            nk_draw_image(out, scaler, &item->data.image, nk_white);
        else {
            if (layout->flags & NK_WINDOW_SCALE_LEFT) {
                nk_fill_triangle(out, scaler.x, scaler.y, scaler.x,
                    scaler.y + scaler.h, scaler.x + scaler.w,
                    scaler.y + scaler.h, item->data.color);
            } else {
                nk_fill_triangle(out, scaler.x + scaler.w, scaler.y, scaler.x + scaler.w,
                    scaler.y + scaler.h, scaler.x, scaler.y + scaler.h, item->data.color);
            }
        }}

        /* do window scaling */
        if (!(window->flags & NK_WINDOW_ROM)) {
            struct nk_vec2 window_size = style->window.min_size;
            int left_mouse_down = in->mouse.buttons[NK_BUTTON_LEFT].down;
            int left_mouse_click_in_scaler = nk_input_has_mouse_click_down_in_rect(in,
                    NK_BUTTON_LEFT, scaler, nk_true);

            if (left_mouse_down && left_mouse_click_in_scaler) {
                float delta_x = in->mouse.delta.x;
                if (layout->flags & NK_WINDOW_SCALE_LEFT) {
                    delta_x = -delta_x;
                    window->bounds.x += in->mouse.delta.x;
                }
                /* dragging in x-direction  */
                if (window->bounds.w + delta_x >= window_size.x) {
                    if ((delta_x < 0) || (delta_x > 0 && in->mouse.pos.x >= scaler.x)) {
                        window->bounds.w = window->bounds.w + delta_x;
                        scaler.x += in->mouse.delta.x;
                    }
                }
                /* dragging in y-direction (only possible if static window) */
                if (!(layout->flags & NK_WINDOW_DYNAMIC)) {
                    if (window_size.y < window->bounds.h + in->mouse.delta.y) {
                        if ((in->mouse.delta.y < 0) || (in->mouse.delta.y > 0 && in->mouse.pos.y >= scaler.y)) {
                            window->bounds.h = window->bounds.h + in->mouse.delta.y;
                            scaler.y += in->mouse.delta.y;
                        }
                    }
                }
                ctx->style.cursor_active = ctx->style.cursors[NK_CURSOR_RESIZE_TOP_RIGHT_DOWN_LEFT];
                in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.x = scaler.x + scaler.w/2.0f;
                in->mouse.buttons[NK_BUTTON_LEFT].clicked_pos.y = scaler.y + scaler.h/2.0f;
            }
        }
    }
    if (!nk_panel_is_sub(layout->type)) {
        /* window is hidden so clear command buffer  */
        if (layout->flags & NK_WINDOW_HIDDEN)
            nk_command_buffer_reset(&window->buffer);
        /* window is visible and not tab */
        else nk_finish(ctx, window);
    }

    /* NK_WINDOW_REMOVE_ROM flag was set so remove NK_WINDOW_ROM */
    if (layout->flags & NK_WINDOW_REMOVE_ROM) {
        layout->flags &= ~(nk_flags)NK_WINDOW_ROM;
        layout->flags &= ~(nk_flags)NK_WINDOW_REMOVE_ROM;
    }
    window->flags = layout->flags;

    /* property garbage collector */
    if (window->property.active && window->property.old != window->property.seq &&
        window->property.active == window->property.prev) {
        nk_zero(&window->property, sizeof(window->property));
    } else {
        window->property.old = window->property.seq;
        window->property.prev = window->property.active;
        window->property.seq = 0;
    }
    /* edit garbage collector */
    if (window->edit.active && window->edit.old != window->edit.seq &&
       window->edit.active == window->edit.prev) {
        nk_zero(&window->edit, sizeof(window->edit));
    } else {
        window->edit.old = window->edit.seq;
        window->edit.prev = window->edit.active;
        window->edit.seq = 0;
    }
    /* contextual garbage collector */
    if (window->popup.active_con && window->popup.con_old != window->popup.con_count) {
        window->popup.con_count = 0;
        window->popup.con_old = 0;
        window->popup.active_con = 0;
    } else {
        window->popup.con_old = window->popup.con_count;
        window->popup.con_count = 0;
    }
    window->popup.combo_count = 0;
    /* helper to make sure you have a 'nk_tree_push' for every 'nk_tree_pop' */
    NK_ASSERT(!layout->row.tree_depth);
}

/* ----------------------------------------------------------------
 *
 *                          PAGE ELEMENT
 *
 * ---------------------------------------------------------------*/
NK_INTERN struct nk_page_element*
nk_create_page_element(struct nk_context *ctx)
{
    struct nk_page_element *elem;
    if (ctx->freelist) {
        /* unlink page element from free list */
        elem = ctx->freelist;
        ctx->freelist = elem->next;
    } else if (ctx->use_pool) {
        /* allocate page element from memory pool */
        elem = nk_pool_alloc(&ctx->pool);
        NK_ASSERT(elem);
        if (!elem) return 0;
    } else {
        /* allocate new page element from back of fixed size memory buffer */
        NK_STORAGE const nk_size size = sizeof(struct nk_page_element);
        NK_STORAGE const nk_size align = NK_ALIGNOF(struct nk_page_element);
        elem = (struct nk_page_element*)nk_buffer_alloc(&ctx->memory, NK_BUFFER_BACK, size, align);
        NK_ASSERT(elem);
        if (!elem) return 0;
    }
    nk_zero_struct(*elem);
    elem->next = 0;
    elem->prev = 0;
    return elem;
}

NK_INTERN void
nk_link_page_element_into_freelist(struct nk_context *ctx,
    struct nk_page_element *elem)
{
    /* link table into freelist */
    if (!ctx->freelist) {
        ctx->freelist = elem;
    } else {
        elem->next = ctx->freelist;
        ctx->freelist = elem;
    }
}

NK_INTERN void
nk_free_page_element(struct nk_context *ctx, struct nk_page_element *elem)
{
    /* we have a pool so just add to free list */
    if (ctx->use_pool) {
        nk_link_page_element_into_freelist(ctx, elem);
        return;
    }
    /* if possible remove last element from back of fixed memory buffer */
    {void *elem_end = (void*)(elem + 1);
    void *buffer_end = (nk_byte*)ctx->memory.memory.ptr + ctx->memory.size;
    if (elem_end == buffer_end)
        ctx->memory.size -= sizeof(struct nk_page_element);
    else nk_link_page_element_into_freelist(ctx, elem);}
}

/* ----------------------------------------------------------------
 *
 *                          PANEL
 *
 * ---------------------------------------------------------------*/
NK_INTERN void*
nk_create_panel(struct nk_context *ctx)
{
    struct nk_page_element *elem;
    elem = nk_create_page_element(ctx);
    if (!elem) return 0;
    nk_zero_struct(*elem);
    return &elem->data.pan;
}

NK_INTERN void
nk_free_panel(struct nk_context *ctx, struct nk_panel *pan)
{
    union nk_page_data *pd = NK_CONTAINER_OF(pan, union nk_page_data, pan);
    struct nk_page_element *pe = NK_CONTAINER_OF(pd, struct nk_page_element, data);
    nk_free_page_element(ctx, pe);
}

/* ----------------------------------------------------------------
 *
 *                          TABLES
 *
 * ---------------------------------------------------------------*/
NK_INTERN struct nk_table*
nk_create_table(struct nk_context *ctx)
{
    struct nk_page_element *elem;
    elem = nk_create_page_element(ctx);
    if (!elem) return 0;
    nk_zero_struct(*elem);
    return &elem->data.tbl;
}

NK_INTERN void
nk_free_table(struct nk_context *ctx, struct nk_table *tbl)
{
    union nk_page_data *pd = NK_CONTAINER_OF(tbl, union nk_page_data, tbl);
    struct nk_page_element *pe = NK_CONTAINER_OF(pd, struct nk_page_element, data);
    nk_free_page_element(ctx, pe);
}

NK_INTERN void
nk_push_table(struct nk_window *win, struct nk_table *tbl)
{
    if (!win->tables) {
        win->tables = tbl;
        tbl->next = 0;
        tbl->prev = 0;
        tbl->size = 0;
        win->table_count = 1;
        return;
    }
    win->tables->prev = tbl;
    tbl->next = win->tables;
    tbl->prev = 0;
    tbl->size = 0;
    win->tables = tbl;
    win->table_count++;
}

NK_INTERN void
nk_remove_table(struct nk_window *win, struct nk_table *tbl)
{
    if (win->tables == tbl)
        win->tables = tbl->next;
    if (tbl->next)
        tbl->next->prev = tbl->prev;
    if (tbl->prev)
        tbl->prev->next = tbl->next;
    tbl->next = 0;
    tbl->prev = 0;
}

NK_INTERN nk_uint*
nk_add_value(struct nk_context *ctx, struct nk_window *win,
            nk_hash name, nk_uint value)
{
    NK_ASSERT(ctx);
    NK_ASSERT(win);
    if (!win || !ctx) return 0;
    if (!win->tables || win->tables->size >= NK_VALUE_PAGE_CAPACITY) {
        struct nk_table *tbl = nk_create_table(ctx);
        NK_ASSERT(tbl);
        if (!tbl) return 0;
        nk_push_table(win, tbl);
    }
    win->tables->seq = win->seq;
    win->tables->keys[win->tables->size] = name;
    win->tables->values[win->tables->size] = value;
    return &win->tables->values[win->tables->size++];
}

NK_INTERN nk_uint*
nk_find_value(struct nk_window *win, nk_hash name)
{
    struct nk_table *iter = win->tables;
    while (iter) {
        unsigned int i = 0;
        unsigned int size = iter->size;
        for (i = 0; i < size; ++i) {
            if (iter->keys[i] == name) {
                iter->seq = win->seq;
                return &iter->values[i];
            }
        } size = NK_VALUE_PAGE_CAPACITY;
        iter = iter->next;
    }
    return 0;
}

/* ----------------------------------------------------------------
 *
 *                          WINDOW
 *
 * ---------------------------------------------------------------*/
NK_INTERN void*
nk_create_window(struct nk_context *ctx)
{
    struct nk_page_element *elem;
    elem = nk_create_page_element(ctx);
    if (!elem) return 0;
    elem->data.win.seq = ctx->seq;
    return &elem->data.win;
}

NK_INTERN void
nk_free_window(struct nk_context *ctx, struct nk_window *win)
{
    /* unlink windows from list */
    struct nk_table *it = win->tables;
    if (win->popup.win) {
        nk_free_window(ctx, win->popup.win);
        win->popup.win = 0;
    }
    win->next = 0;
    win->prev = 0;

    while (it) {
        /*free window state tables */
        struct nk_table *n = it->next;
        nk_remove_table(win, it);
        nk_free_table(ctx, it);
        if (it == win->tables)
            win->tables = n;
        it = n;
    }

    /* link windows into freelist */
    {union nk_page_data *pd = NK_CONTAINER_OF(win, union nk_page_data, win);
    struct nk_page_element *pe = NK_CONTAINER_OF(pd, struct nk_page_element, data);
    nk_free_page_element(ctx, pe);}
}

NK_INTERN struct nk_window*
nk_find_window(struct nk_context *ctx, nk_hash hash, const char *name)
{
    struct nk_window *iter;
    iter = ctx->begin;
    while (iter) {
        NK_ASSERT(iter != iter->next);
        if (iter->name == hash) {
            int max_len = nk_strlen(iter->name_string);
            if (!nk_stricmpn(iter->name_string, name, max_len))
                return iter;
        }
        iter = iter->next;
    }
    return 0;
}

enum nk_window_insert_location {
    NK_INSERT_BACK, /* inserts window into the back of list (front of screen) */
    NK_INSERT_FRONT /* inserts window into the front of list (back of screen) */
};
NK_INTERN void
nk_insert_window(struct nk_context *ctx, struct nk_window *win,
    enum nk_window_insert_location loc)
{
    const struct nk_window *iter;
    NK_ASSERT(ctx);
    NK_ASSERT(win);
    if (!win || !ctx) return;

    iter = ctx->begin;
    while (iter) {
        NK_ASSERT(iter != iter->next);
        NK_ASSERT(iter != win);
        if (iter == win) return;
        iter = iter->next;
    }

    if (!ctx->begin) {
        win->next = 0;
        win->prev = 0;
        ctx->begin = win;
        ctx->end = win;
        ctx->count = 1;
        return;
    }
    if (loc == NK_INSERT_BACK) {
        struct nk_window *end;
        end = ctx->end;
        end->flags |= NK_WINDOW_ROM;
        end->next = win;
        win->prev = ctx->end;
        win->next = 0;
        ctx->end = win;
        ctx->active = ctx->end;
        ctx->end->flags &= ~(nk_flags)NK_WINDOW_ROM;
    } else {
        /*ctx->end->flags |= NK_WINDOW_ROM;*/
        ctx->begin->prev = win;
        win->next = ctx->begin;
        win->prev = 0;
        ctx->begin = win;
        ctx->begin->flags &= ~(nk_flags)NK_WINDOW_ROM;
    }
    ctx->count++;
}

NK_INTERN void
nk_remove_window(struct nk_context *ctx, struct nk_window *win)
{
    if (win == ctx->begin || win == ctx->end) {
        if (win == ctx->begin) {
            ctx->begin = win->next;
            if (win->next)
                win->next->prev = 0;
        }
        if (win == ctx->end) {
            ctx->end = win->prev;
            if (win->prev)
                win->prev->next = 0;
        }
    } else {
        if (win->next)
            win->next->prev = win->prev;
        if (win->prev)
            win->prev->next = win->next;
    }
    if (win == ctx->active || !ctx->active) {
        ctx->active = ctx->end;
        if (ctx->end)
            ctx->end->flags &= ~(nk_flags)NK_WINDOW_ROM;
    }
    win->next = 0;
    win->prev = 0;
    ctx->count--;
}

NK_API int
nk_begin(struct nk_context *ctx, const char *title,
    struct nk_rect bounds, nk_flags flags)
{
    return nk_begin_titled(ctx, title, title, bounds, flags);
}

NK_API int
nk_begin_titled(struct nk_context *ctx, const char *name, const char *title,
    struct nk_rect bounds, nk_flags flags)
{
    struct nk_window *win;
    struct nk_style *style;
    nk_hash title_hash;
    int title_len;
    int ret = 0;

    NK_ASSERT(ctx);
    NK_ASSERT(name);
    NK_ASSERT(title);
    NK_ASSERT(ctx->style.font && ctx->style.font->width && "if this triggers you forgot to add a font");
    NK_ASSERT(!ctx->current && "if this triggers you missed a `nk_end` call");
    if (!ctx || ctx->current || !title || !name)
        return 0;

    /* find or create window */
    style = &ctx->style;
    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    win = nk_find_window(ctx, title_hash, name);
    if (!win) {
        /* create new window */
        nk_size name_length = (nk_size)nk_strlen(name);
        win = (struct nk_window*)nk_create_window(ctx);
        NK_ASSERT(win);
        if (!win) return 0;

        if (flags & NK_WINDOW_BACKGROUND)
            nk_insert_window(ctx, win, NK_INSERT_FRONT);
        else nk_insert_window(ctx, win, NK_INSERT_BACK);
        nk_command_buffer_init(&win->buffer, &ctx->memory, NK_CLIPPING_ON);

        win->flags = flags;
        win->bounds = bounds;
        win->name = title_hash;
        name_length = NK_MIN(name_length, NK_WINDOW_MAX_NAME-1);
        NK_MEMCPY(win->name_string, name, name_length);
        win->name_string[name_length] = 0;
        win->popup.win = 0;
        if (!ctx->active)
            ctx->active = win;
    } else {
        /* update window */
        win->flags &= ~(nk_flags)(NK_WINDOW_PRIVATE-1);
        win->flags |= flags;
        if (!(win->flags & (NK_WINDOW_MOVABLE | NK_WINDOW_SCALABLE)))
            win->bounds = bounds;
        /* If this assert triggers you either:
         *
         * I.) Have more than one window with the same name or
         * II.) You forgot to actually draw the window.
         *      More specific you did not call `nk_clear` (nk_clear will be
         *      automatically called for you if you are using one of the
         *      provided demo backends). */
        NK_ASSERT(win->seq != ctx->seq);
        win->seq = ctx->seq;
        if (!ctx->active && !(win->flags & NK_WINDOW_HIDDEN)) {
            ctx->active = win;
            ctx->end = win;
        }
    }
    if (win->flags & NK_WINDOW_HIDDEN) {
        ctx->current = win;
        win->layout = 0;
        return 0;
    }

    /* window overlapping */
    if (!(win->flags & NK_WINDOW_HIDDEN) && !(win->flags & NK_WINDOW_NO_INPUT))
    {
        int inpanel, ishovered;
        struct nk_window *iter = win;
        float h = ctx->style.font->height + 2.0f * style->window.header.padding.y +
            (2.0f * style->window.header.label_padding.y);
        struct nk_rect win_bounds = (!(win->flags & NK_WINDOW_MINIMIZED))?
            win->bounds: nk_rect(win->bounds.x, win->bounds.y, win->bounds.w, h);

        /* activate window if hovered and no other window is overlapping this window */
        nk_start(ctx, win);
        inpanel = nk_input_has_mouse_click_down_in_rect(&ctx->input, NK_BUTTON_LEFT, win_bounds, nk_true);
        inpanel = inpanel && ctx->input.mouse.buttons[NK_BUTTON_LEFT].clicked;
        ishovered = nk_input_is_mouse_hovering_rect(&ctx->input, win_bounds);
        if ((win != ctx->active) && ishovered && !ctx->input.mouse.buttons[NK_BUTTON_LEFT].down) {
            iter = win->next;
            while (iter) {
                struct nk_rect iter_bounds = (!(iter->flags & NK_WINDOW_MINIMIZED))?
                    iter->bounds: nk_rect(iter->bounds.x, iter->bounds.y, iter->bounds.w, h);
                if (NK_INTERSECT(win_bounds.x, win_bounds.y, win_bounds.w, win_bounds.h,
                    iter_bounds.x, iter_bounds.y, iter_bounds.w, iter_bounds.h) &&
                    (!(iter->flags & NK_WINDOW_HIDDEN)))
                    break;

                if (iter->popup.win && iter->popup.active && !(iter->flags & NK_WINDOW_HIDDEN) &&
                    NK_INTERSECT(win->bounds.x, win_bounds.y, win_bounds.w, win_bounds.h,
                    iter->popup.win->bounds.x, iter->popup.win->bounds.y,
                    iter->popup.win->bounds.w, iter->popup.win->bounds.h))
                    break;
                iter = iter->next;
            }
        }

        /* activate window if clicked */
        if (iter && inpanel && (win != ctx->end)) {
            iter = win->next;
            while (iter) {
                /* try to find a panel with higher priority in the same position */
                struct nk_rect iter_bounds = (!(iter->flags & NK_WINDOW_MINIMIZED))?
                iter->bounds: nk_rect(iter->bounds.x, iter->bounds.y, iter->bounds.w, h);
                if (NK_INBOX(ctx->input.mouse.pos.x, ctx->input.mouse.pos.y,
                    iter_bounds.x, iter_bounds.y, iter_bounds.w, iter_bounds.h) &&
                    !(iter->flags & NK_WINDOW_HIDDEN))
                    break;
                if (iter->popup.win && iter->popup.active && !(iter->flags & NK_WINDOW_HIDDEN) &&
                    NK_INTERSECT(win_bounds.x, win_bounds.y, win_bounds.w, win_bounds.h,
                    iter->popup.win->bounds.x, iter->popup.win->bounds.y,
                    iter->popup.win->bounds.w, iter->popup.win->bounds.h))
                    break;
                iter = iter->next;
            }
        }
        if (iter && !(win->flags & NK_WINDOW_ROM) && (win->flags & NK_WINDOW_BACKGROUND)) {
            win->flags |= (nk_flags)NK_WINDOW_ROM;
            iter->flags &= ~(nk_flags)NK_WINDOW_ROM;
            ctx->active = iter;
            if (!(iter->flags & NK_WINDOW_BACKGROUND)) {
                /* current window is active in that position so transfer to top
                 * at the highest priority in stack */
                nk_remove_window(ctx, iter);
                nk_insert_window(ctx, iter, NK_INSERT_BACK);
            }
        } else {
            if (!iter && ctx->end != win) {
                if (!(win->flags & NK_WINDOW_BACKGROUND)) {
                    /* current window is active in that position so transfer to top
                     * at the highest priority in stack */
                    nk_remove_window(ctx, win);
                    nk_insert_window(ctx, win, NK_INSERT_BACK);
                }
                win->flags &= ~(nk_flags)NK_WINDOW_ROM;
                ctx->active = win;
            }
            if (ctx->end != win && !(win->flags & NK_WINDOW_BACKGROUND))
                win->flags |= NK_WINDOW_ROM;
        }
    }

    win->layout = (struct nk_panel*)nk_create_panel(ctx);
    ctx->current = win;
    ret = nk_panel_begin(ctx, title, NK_PANEL_WINDOW);
    win->layout->offset_x = &win->scrollbar.x;
    win->layout->offset_y = &win->scrollbar.y;
    return ret;
}

NK_API void
nk_end(struct nk_context *ctx)
{
    struct nk_panel *layout;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current && "if this triggers you forgot to call `nk_begin`");
    if (!ctx || !ctx->current)
        return;

    layout = ctx->current->layout;
    if (!layout || (layout->type == NK_PANEL_WINDOW && (ctx->current->flags & NK_WINDOW_HIDDEN))) {
        ctx->current = 0;
        return;
    }
    nk_panel_end(ctx);
    nk_free_panel(ctx, ctx->current->layout);
    ctx->current = 0;
}

NK_API struct nk_rect
nk_window_get_bounds(const struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return nk_rect(0,0,0,0);
    return ctx->current->bounds;
}

NK_API struct nk_vec2
nk_window_get_position(const struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return nk_vec2(0,0);
    return nk_vec2(ctx->current->bounds.x, ctx->current->bounds.y);
}

NK_API struct nk_vec2
nk_window_get_size(const struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return nk_vec2(0,0);
    return nk_vec2(ctx->current->bounds.w, ctx->current->bounds.h);
}

NK_API float
nk_window_get_width(const struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return 0;
    return ctx->current->bounds.w;
}

NK_API float
nk_window_get_height(const struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return 0;
    return ctx->current->bounds.h;
}

NK_API struct nk_rect
nk_window_get_content_region(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return nk_rect(0,0,0,0);
    return ctx->current->layout->clip;
}

NK_API struct nk_vec2
nk_window_get_content_region_min(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current) return nk_vec2(0,0);
    return nk_vec2(ctx->current->layout->clip.x, ctx->current->layout->clip.y);
}

NK_API struct nk_vec2
nk_window_get_content_region_max(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current) return nk_vec2(0,0);
    return nk_vec2(ctx->current->layout->clip.x + ctx->current->layout->clip.w,
        ctx->current->layout->clip.y + ctx->current->layout->clip.h);
}

NK_API struct nk_vec2
nk_window_get_content_region_size(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current) return nk_vec2(0,0);
    return nk_vec2(ctx->current->layout->clip.w, ctx->current->layout->clip.h);
}

NK_API struct nk_command_buffer*
nk_window_get_canvas(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current) return 0;
    return &ctx->current->buffer;
}

NK_API struct nk_panel*
nk_window_get_panel(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return 0;
    return ctx->current->layout;
}

NK_API int
nk_window_has_focus(const struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current) return 0;
    return ctx->current == ctx->active;
}

NK_API int
nk_window_is_hovered(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return 0;
    if(ctx->current->flags & NK_WINDOW_HIDDEN)
        return 0;
    return nk_input_is_mouse_hovering_rect(&ctx->input, ctx->current->bounds);
}

NK_API int
nk_window_is_any_hovered(struct nk_context *ctx)
{
    struct nk_window *iter;
    NK_ASSERT(ctx);
    if (!ctx) return 0;
    iter = ctx->begin;
    while (iter) {
        /* check if window is being hovered */
        if(!(iter->flags & NK_WINDOW_HIDDEN)) {
            /* check if window popup is being hovered */
            if (iter->popup.active && iter->popup.win && nk_input_is_mouse_hovering_rect(&ctx->input, iter->popup.win->bounds))
                return 1;

            if (iter->flags & NK_WINDOW_MINIMIZED) {
                struct nk_rect header = iter->bounds;
                header.h = ctx->style.font->height + 2 * ctx->style.window.header.padding.y;
                if (nk_input_is_mouse_hovering_rect(&ctx->input, header))
                    return 1;
            } else if (nk_input_is_mouse_hovering_rect(&ctx->input, iter->bounds)) {
                return 1;
            }
        }
        iter = iter->next;
    }
    return 0;
}

NK_API int
nk_item_is_any_active(struct nk_context *ctx)
{
    int any_hovered = nk_window_is_any_hovered(ctx);
    int any_active = (ctx->last_widget_state & NK_WIDGET_STATE_MODIFIED);
    return any_hovered || any_active;
}

NK_API int
nk_window_is_collapsed(struct nk_context *ctx, const char *name)
{
    int title_len;
    nk_hash title_hash;
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return 0;

    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    win = nk_find_window(ctx, title_hash, name);
    if (!win) return 0;
    return win->flags & NK_WINDOW_MINIMIZED;
}

NK_API int
nk_window_is_closed(struct nk_context *ctx, const char *name)
{
    int title_len;
    nk_hash title_hash;
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return 1;

    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    win = nk_find_window(ctx, title_hash, name);
    if (!win) return 1;
    return (win->flags & NK_WINDOW_CLOSED);
}

NK_API int
nk_window_is_hidden(struct nk_context *ctx, const char *name)
{
    int title_len;
    nk_hash title_hash;
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return 1;

    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    win = nk_find_window(ctx, title_hash, name);
    if (!win) return 1;
    return (win->flags & NK_WINDOW_HIDDEN);
}

NK_API int
nk_window_is_active(struct nk_context *ctx, const char *name)
{
    int title_len;
    nk_hash title_hash;
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return 0;

    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    win = nk_find_window(ctx, title_hash, name);
    if (!win) return 0;
    return win == ctx->active;
}

NK_API struct nk_window*
nk_window_find(struct nk_context *ctx, const char *name)
{
    int title_len;
    nk_hash title_hash;
    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    return nk_find_window(ctx, title_hash, name);
}

NK_API void
nk_window_close(struct nk_context *ctx, const char *name)
{
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return;
    win = nk_window_find(ctx, name);
    if (!win) return;
    NK_ASSERT(ctx->current != win && "You cannot close a currently active window");
    if (ctx->current == win) return;
    win->flags |= NK_WINDOW_HIDDEN;
    win->flags |= NK_WINDOW_CLOSED;
}

NK_API void
nk_window_set_bounds(struct nk_context *ctx,
    const char *name, struct nk_rect bounds)
{
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return;
    win = nk_window_find(ctx, name);
    if (!win) return;
    NK_ASSERT(ctx->current != win && "You cannot update a currently in procecss window");
    win->bounds = bounds;
}

NK_API void
nk_window_set_position(struct nk_context *ctx,
    const char *name, struct nk_vec2 pos)
{
    struct nk_rect bounds;
    bounds.x = pos.x;
    bounds.y = pos.y;
    bounds.w = ctx->current->bounds.w;
    bounds.h = ctx->current->bounds.h;
    nk_window_set_bounds(ctx, name, bounds);
}

NK_API void
nk_window_set_size(struct nk_context *ctx,
    const char *name, struct nk_vec2 size)
{
    struct nk_rect bounds;
    bounds.x = ctx->current->bounds.x;
    bounds.y = ctx->current->bounds.y;
    bounds.w = size.x;
    bounds.h = size.y;
    nk_window_set_bounds(ctx, name, bounds);
}

NK_API void
nk_window_collapse(struct nk_context *ctx, const char *name,
                    enum nk_collapse_states c)
{
    int title_len;
    nk_hash title_hash;
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return;

    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    win = nk_find_window(ctx, title_hash, name);
    if (!win) return;
    if (c == NK_MINIMIZED)
        win->flags |= NK_WINDOW_MINIMIZED;
    else win->flags &= ~(nk_flags)NK_WINDOW_MINIMIZED;
}

NK_API void
nk_window_collapse_if(struct nk_context *ctx, const char *name,
    enum nk_collapse_states c, int cond)
{
    NK_ASSERT(ctx);
    if (!ctx || !cond) return;
    nk_window_collapse(ctx, name, c);
}

NK_API void
nk_window_show(struct nk_context *ctx, const char *name, enum nk_show_states s)
{
    int title_len;
    nk_hash title_hash;
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return;

    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    win = nk_find_window(ctx, title_hash, name);
    if (!win) return;
    if (s == NK_HIDDEN) {
        win->flags |= NK_WINDOW_HIDDEN;
    } else win->flags &= ~(nk_flags)NK_WINDOW_HIDDEN;
}

NK_API void
nk_window_show_if(struct nk_context *ctx, const char *name,
    enum nk_show_states s, int cond)
{
    NK_ASSERT(ctx);
    if (!ctx || !cond) return;
    nk_window_show(ctx, name, s);
}

NK_API void
nk_window_set_focus(struct nk_context *ctx, const char *name)
{
    int title_len;
    nk_hash title_hash;
    struct nk_window *win;
    NK_ASSERT(ctx);
    if (!ctx) return;

    title_len = (int)nk_strlen(name);
    title_hash = nk_murmur_hash(name, (int)title_len, NK_WINDOW_TITLE);
    win = nk_find_window(ctx, title_hash, name);
    if (win && ctx->end != win) {
        nk_remove_window(ctx, win);
        nk_insert_window(ctx, win, NK_INSERT_BACK);
    }
    ctx->active = win;
}

/*----------------------------------------------------------------
 *
 *                          MENUBAR
 *
 * --------------------------------------------------------------*/
NK_API void
nk_menubar_begin(struct nk_context *ctx)
{
    struct nk_panel *layout;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    layout = ctx->current->layout;
    NK_ASSERT(layout->at_y == layout->bounds.y);
    /* if this assert triggers you allocated space between nk_begin and nk_menubar_begin.
    If you want a menubar the first nuklear function after `nk_begin` has to be a
    `nk_menubar_begin` call. Inside the menubar you then have to allocate space for
    widgets (also supports multiple rows).
    Example:
        if (nk_begin(...)) {
            nk_menubar_begin(...);
                nk_layout_xxxx(...);
                nk_button(...);
                nk_layout_xxxx(...);
                nk_button(...);
            nk_menubar_end(...);
        }
        nk_end(...);
    */
    if (layout->flags & NK_WINDOW_HIDDEN || layout->flags & NK_WINDOW_MINIMIZED)
        return;

    layout->menu.x = layout->at_x;
    layout->menu.y = layout->at_y + layout->row.height;
    layout->menu.w = layout->bounds.w;
    layout->menu.offset.x = *layout->offset_x;
    layout->menu.offset.y = *layout->offset_y;
    *layout->offset_y = 0;
}

NK_API void
nk_menubar_end(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_panel *layout;
    struct nk_command_buffer *out;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    out = &win->buffer;
    layout = win->layout;
    if (layout->flags & NK_WINDOW_HIDDEN || layout->flags & NK_WINDOW_MINIMIZED)
        return;

    layout->menu.h = layout->at_y - layout->menu.y;
    layout->bounds.y += layout->menu.h + ctx->style.window.spacing.y + layout->row.height;
    layout->bounds.h -= layout->menu.h + ctx->style.window.spacing.y + layout->row.height;

    *layout->offset_x = layout->menu.offset.x;
    *layout->offset_y = layout->menu.offset.y;
    layout->at_y = layout->bounds.y - layout->row.height;

    layout->clip.y = layout->bounds.y;
    layout->clip.h = layout->bounds.h;
    nk_push_scissor(out, layout->clip);
}
/* -------------------------------------------------------------
 *
 *                          LAYOUT
 *
 * --------------------------------------------------------------*/
NK_API void
nk_layout_set_min_row_height(struct nk_context *ctx, float height)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    layout->row.min_height = height;
}

NK_API void
nk_layout_reset_min_row_height(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    layout->row.min_height = ctx->style.font->height;
    layout->row.min_height += ctx->style.text.padding.y*2;
    layout->row.min_height += ctx->style.window.min_row_height_padding*2;
}

NK_INTERN float
nk_layout_row_calculate_usable_space(const struct nk_style *style, enum nk_panel_type type,
    float total_space, int columns)
{
    float panel_padding;
    float panel_spacing;
    float panel_space;

    struct nk_vec2 spacing;
    struct nk_vec2 padding;

    spacing = style->window.spacing;
    padding = nk_panel_get_padding(style, type);

    /* calculate the usable panel space */
    panel_padding = 2 * padding.x;
    panel_spacing = (float)NK_MAX(columns - 1, 0) * spacing.x;
    panel_space  = total_space - panel_padding - panel_spacing;
    return panel_space;
}

NK_INTERN void
nk_panel_layout(const struct nk_context *ctx, struct nk_window *win,
    float height, int cols)
{
    struct nk_panel *layout;
    const struct nk_style *style;
    struct nk_command_buffer *out;

    struct nk_vec2 item_spacing;
    struct nk_color color;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    /* prefetch some configuration data */
    layout = win->layout;
    style = &ctx->style;
    out = &win->buffer;
    color = style->window.background;
    item_spacing = style->window.spacing;

    /*  if one of these triggers you forgot to add an `if` condition around either
        a window, group, popup, combobox or contextual menu `begin` and `end` block.
        Example:
            if (nk_begin(...) {...} nk_end(...); or
            if (nk_group_begin(...) { nk_group_end(...);} */
    NK_ASSERT(!(layout->flags & NK_WINDOW_MINIMIZED));
    NK_ASSERT(!(layout->flags & NK_WINDOW_HIDDEN));
    NK_ASSERT(!(layout->flags & NK_WINDOW_CLOSED));

    /* update the current row and set the current row layout */
    layout->row.index = 0;
    layout->at_y += layout->row.height;
    layout->row.columns = cols;
    if (height == 0.0f)
        layout->row.height = NK_MAX(height, layout->row.min_height) + item_spacing.y;
    else layout->row.height = height + item_spacing.y;

    layout->row.item_offset = 0;
    if (layout->flags & NK_WINDOW_DYNAMIC) {
        /* draw background for dynamic panels */
        struct nk_rect background;
        background.x = win->bounds.x;
        background.w = win->bounds.w;
        background.y = layout->at_y - 1.0f;
        background.h = layout->row.height + 1.0f;
        nk_fill_rect(out, background, 0, color);
    }
}

NK_INTERN void
nk_row_layout(struct nk_context *ctx, enum nk_layout_format fmt,
    float height, int cols, int width)
{
    /* update the current row and set the current row layout */
    struct nk_window *win;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    nk_panel_layout(ctx, win, height, cols);
    if (fmt == NK_DYNAMIC)
        win->layout->row.type = NK_LAYOUT_DYNAMIC_FIXED;
    else win->layout->row.type = NK_LAYOUT_STATIC_FIXED;

    win->layout->row.ratio = 0;
    win->layout->row.filled = 0;
    win->layout->row.item_offset = 0;
    win->layout->row.item_width = (float)width;
}

NK_API float
nk_layout_ratio_from_pixel(struct nk_context *ctx, float pixel_width)
{
    struct nk_window *win;
    NK_ASSERT(ctx);
    NK_ASSERT(pixel_width);
    if (!ctx || !ctx->current || !ctx->current->layout) return 0;
    win = ctx->current;
    return NK_CLAMP(0.0f, pixel_width/win->bounds.x, 1.0f);
}

NK_API void
nk_layout_row_dynamic(struct nk_context *ctx, float height, int cols)
{
    nk_row_layout(ctx, NK_DYNAMIC, height, cols, 0);
}

NK_API void
nk_layout_row_static(struct nk_context *ctx, float height, int item_width, int cols)
{
    nk_row_layout(ctx, NK_STATIC, height, cols, item_width);
}

NK_API void
nk_layout_row_begin(struct nk_context *ctx, enum nk_layout_format fmt,
    float row_height, int cols)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    nk_panel_layout(ctx, win, row_height, cols);
    if (fmt == NK_DYNAMIC)
        layout->row.type = NK_LAYOUT_DYNAMIC_ROW;
    else layout->row.type = NK_LAYOUT_STATIC_ROW;

    layout->row.ratio = 0;
    layout->row.filled = 0;
    layout->row.item_width = 0;
    layout->row.item_offset = 0;
    layout->row.columns = cols;
}

NK_API void
nk_layout_row_push(struct nk_context *ctx, float ratio_or_width)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    NK_ASSERT(layout->row.type == NK_LAYOUT_STATIC_ROW || layout->row.type == NK_LAYOUT_DYNAMIC_ROW);
    if (layout->row.type != NK_LAYOUT_STATIC_ROW && layout->row.type != NK_LAYOUT_DYNAMIC_ROW)
        return;

    if (layout->row.type == NK_LAYOUT_DYNAMIC_ROW) {
        float ratio = ratio_or_width;
        if ((ratio + layout->row.filled) > 1.0f) return;
        if (ratio > 0.0f)
            layout->row.item_width = NK_SATURATE(ratio);
        else layout->row.item_width = 1.0f - layout->row.filled;
    } else layout->row.item_width = ratio_or_width;
}

NK_API void
nk_layout_row_end(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    NK_ASSERT(layout->row.type == NK_LAYOUT_STATIC_ROW || layout->row.type == NK_LAYOUT_DYNAMIC_ROW);
    if (layout->row.type != NK_LAYOUT_STATIC_ROW && layout->row.type != NK_LAYOUT_DYNAMIC_ROW)
        return;
    layout->row.item_width = 0;
    layout->row.item_offset = 0;
}

NK_API void
nk_layout_row(struct nk_context *ctx, enum nk_layout_format fmt,
    float height, int cols, const float *ratio)
{
    int i;
    int n_undef = 0;
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    nk_panel_layout(ctx, win, height, cols);
    if (fmt == NK_DYNAMIC) {
        /* calculate width of undefined widget ratios */
        float r = 0;
        layout->row.ratio = ratio;
        for (i = 0; i < cols; ++i) {
            if (ratio[i] < 0.0f)
                n_undef++;
            else r += ratio[i];
        }
        r = NK_SATURATE(1.0f - r);
        layout->row.type = NK_LAYOUT_DYNAMIC;
        layout->row.item_width = (r > 0 && n_undef > 0) ? (r / (float)n_undef):0;
    } else {
        layout->row.ratio = ratio;
        layout->row.type = NK_LAYOUT_STATIC;
        layout->row.item_width = 0;
        layout->row.item_offset = 0;
    }
    layout->row.item_offset = 0;
    layout->row.filled = 0;
}

NK_API void
nk_layout_row_template_begin(struct nk_context *ctx, float height)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    nk_panel_layout(ctx, win, height, 1);
    layout->row.type = NK_LAYOUT_TEMPLATE;
    layout->row.columns = 0;
    layout->row.ratio = 0;
    layout->row.item_width = 0;
    layout->row.item_height = 0;
    layout->row.item_offset = 0;
    layout->row.filled = 0;
    layout->row.item.x = 0;
    layout->row.item.y = 0;
    layout->row.item.w = 0;
    layout->row.item.h = 0;
}

NK_API void
nk_layout_row_template_push_dynamic(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    NK_ASSERT(layout->row.type == NK_LAYOUT_TEMPLATE);
    NK_ASSERT(layout->row.columns < NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS);
    if (layout->row.type != NK_LAYOUT_TEMPLATE) return;
    if (layout->row.columns >= NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS) return;
    layout->row.templates[layout->row.columns++] = -1.0f;
}

NK_API void
nk_layout_row_template_push_variable(struct nk_context *ctx, float min_width)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    NK_ASSERT(layout->row.type == NK_LAYOUT_TEMPLATE);
    NK_ASSERT(layout->row.columns < NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS);
    if (layout->row.type != NK_LAYOUT_TEMPLATE) return;
    if (layout->row.columns >= NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS) return;
    layout->row.templates[layout->row.columns++] = -min_width;
}

NK_API void
nk_layout_row_template_push_static(struct nk_context *ctx, float width)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    NK_ASSERT(layout->row.type == NK_LAYOUT_TEMPLATE);
    NK_ASSERT(layout->row.columns < NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS);
    if (layout->row.type != NK_LAYOUT_TEMPLATE) return;
    if (layout->row.columns >= NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS) return;
    layout->row.templates[layout->row.columns++] = width;
}

NK_API void
nk_layout_row_template_end(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_panel *layout;

    int i = 0;
    int variable_count = 0;
    int min_variable_count = 0;
    float min_fixed_width = 0.0f;
    float total_fixed_width = 0.0f;
    float max_variable_width = 0.0f;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    NK_ASSERT(layout->row.type == NK_LAYOUT_TEMPLATE);
    if (layout->row.type != NK_LAYOUT_TEMPLATE) return;
    for (i = 0; i < layout->row.columns; ++i) {
        float width = layout->row.templates[i];
        if (width >= 0.0f) {
            total_fixed_width += width;
            min_fixed_width += width;
        } else if (width < -1.0f) {
            width = -width;
            total_fixed_width += width;
            max_variable_width = NK_MAX(max_variable_width, width);
            variable_count++;
        } else {
            min_variable_count++;
            variable_count++;
        }
    }
    if (variable_count) {
        float space = nk_layout_row_calculate_usable_space(&ctx->style, layout->type,
                            layout->bounds.w, layout->row.columns);
        float var_width = (NK_MAX(space-min_fixed_width,0.0f)) / (float)variable_count;
        int enough_space = var_width >= max_variable_width;
        if (!enough_space)
            var_width = (NK_MAX(space-total_fixed_width,0)) / (float)min_variable_count;
        for (i = 0; i < layout->row.columns; ++i) {
            float *width = &layout->row.templates[i];
            *width = (*width >= 0.0f)? *width: (*width < -1.0f && !enough_space)? -(*width): var_width;
        }
    }
}

NK_API void
nk_layout_space_begin(struct nk_context *ctx, enum nk_layout_format fmt,
    float height, int widget_count)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    nk_panel_layout(ctx, win, height, widget_count);
    if (fmt == NK_STATIC)
        layout->row.type = NK_LAYOUT_STATIC_FREE;
    else layout->row.type = NK_LAYOUT_DYNAMIC_FREE;

    layout->row.ratio = 0;
    layout->row.filled = 0;
    layout->row.item_width = 0;
    layout->row.item_offset = 0;
}

NK_API void
nk_layout_space_end(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    layout->row.item_width = 0;
    layout->row.item_height = 0;
    layout->row.item_offset = 0;
    nk_zero(&layout->row.item, sizeof(layout->row.item));
}

NK_API void
nk_layout_space_push(struct nk_context *ctx, struct nk_rect rect)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    layout->row.item = rect;
}

NK_API struct nk_rect
nk_layout_space_bounds(struct nk_context *ctx)
{
    struct nk_rect ret;
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    win = ctx->current;
    layout = win->layout;

    ret.x = layout->clip.x;
    ret.y = layout->clip.y;
    ret.w = layout->clip.w;
    ret.h = layout->row.height;
    return ret;
}

NK_API struct nk_rect
nk_layout_widget_bounds(struct nk_context *ctx)
{
    struct nk_rect ret;
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    win = ctx->current;
    layout = win->layout;

    ret.x = layout->at_x;
    ret.y = layout->at_y;
    ret.w = layout->bounds.w - NK_MAX(layout->at_x - layout->bounds.x,0);
    ret.h = layout->row.height;
    return ret;
}

NK_API struct nk_vec2
nk_layout_space_to_screen(struct nk_context *ctx, struct nk_vec2 ret)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    win = ctx->current;
    layout = win->layout;

    ret.x += layout->at_x - (float)*layout->offset_x;
    ret.y += layout->at_y - (float)*layout->offset_y;
    return ret;
}

NK_API struct nk_vec2
nk_layout_space_to_local(struct nk_context *ctx, struct nk_vec2 ret)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    win = ctx->current;
    layout = win->layout;

    ret.x += -layout->at_x + (float)*layout->offset_x;
    ret.y += -layout->at_y + (float)*layout->offset_y;
    return ret;
}

NK_API struct nk_rect
nk_layout_space_rect_to_screen(struct nk_context *ctx, struct nk_rect ret)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    win = ctx->current;
    layout = win->layout;

    ret.x += layout->at_x - (float)*layout->offset_x;
    ret.y += layout->at_y - (float)*layout->offset_y;
    return ret;
}

NK_API struct nk_rect
nk_layout_space_rect_to_local(struct nk_context *ctx, struct nk_rect ret)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    win = ctx->current;
    layout = win->layout;

    ret.x += -layout->at_x + (float)*layout->offset_x;
    ret.y += -layout->at_y + (float)*layout->offset_y;
    return ret;
}

NK_INTERN void
nk_panel_alloc_row(const struct nk_context *ctx, struct nk_window *win)
{
    struct nk_panel *layout = win->layout;
    struct nk_vec2 spacing = ctx->style.window.spacing;
    const float row_height = layout->row.height - spacing.y;
    nk_panel_layout(ctx, win, row_height, layout->row.columns);
}

NK_INTERN void
nk_layout_widget_space(struct nk_rect *bounds, const struct nk_context *ctx,
    struct nk_window *win, int modify)
{
    struct nk_panel *layout;
    const struct nk_style *style;

    struct nk_vec2 spacing;
    struct nk_vec2 padding;

    float item_offset = 0;
    float item_width = 0;
    float item_spacing = 0;
    float panel_space = 0;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    style = &ctx->style;
    NK_ASSERT(bounds);

    spacing = style->window.spacing;
    padding = nk_panel_get_padding(style, layout->type);
    panel_space = nk_layout_row_calculate_usable_space(&ctx->style, layout->type,
                                            layout->bounds.w, layout->row.columns);

    /* calculate the width of one item inside the current layout space */
    switch (layout->row.type) {
    case NK_LAYOUT_DYNAMIC_FIXED: {
        /* scaling fixed size widgets item width */
        item_width = NK_MAX(1.0f,panel_space-1.0f) / (float)layout->row.columns;
        item_offset = (float)layout->row.index * item_width;
        item_spacing = (float)layout->row.index * spacing.x;
    } break;
    case NK_LAYOUT_DYNAMIC_ROW: {
        /* scaling single ratio widget width */
        item_width = layout->row.item_width * panel_space;
        item_offset = layout->row.item_offset;
        item_spacing = 0;

        if (modify) {
            layout->row.item_offset += item_width + spacing.x;
            layout->row.filled += layout->row.item_width;
            layout->row.index = 0;
        }
    } break;
    case NK_LAYOUT_DYNAMIC_FREE: {
        /* panel width depended free widget placing */
        bounds->x = layout->at_x + (layout->bounds.w * layout->row.item.x);
        bounds->x -= (float)*layout->offset_x;
        bounds->y = layout->at_y + (layout->row.height * layout->row.item.y);
        bounds->y -= (float)*layout->offset_y;
        bounds->w = layout->bounds.w  * layout->row.item.w;
        bounds->h = layout->row.height * layout->row.item.h;
        return;
    } break;
    case NK_LAYOUT_DYNAMIC: {
        /* scaling arrays of panel width ratios for every widget */
        float ratio;
        NK_ASSERT(layout->row.ratio);
        ratio = (layout->row.ratio[layout->row.index] < 0) ?
            layout->row.item_width : layout->row.ratio[layout->row.index];

        item_spacing = (float)layout->row.index * spacing.x;
        item_width = (ratio * panel_space);
        item_offset = layout->row.item_offset;

        if (modify) {
            layout->row.item_offset += item_width;
            layout->row.filled += ratio;
        }
    } break;
    case NK_LAYOUT_STATIC_FIXED: {
        /* non-scaling fixed widgets item width */
        item_width = layout->row.item_width;
        item_offset = (float)layout->row.index * item_width;
        item_spacing = (float)layout->row.index * spacing.x;
    } break;
    case NK_LAYOUT_STATIC_ROW: {
        /* scaling single ratio widget width */
        item_width = layout->row.item_width;
        item_offset = layout->row.item_offset;
        item_spacing = (float)layout->row.index * spacing.x;
        if (modify) layout->row.item_offset += item_width;
    } break;
    case NK_LAYOUT_STATIC_FREE: {
        /* free widget placing */
        bounds->x = layout->at_x + layout->row.item.x;
        bounds->w = layout->row.item.w;
        if (((bounds->x + bounds->w) > layout->max_x) && modify)
            layout->max_x = (bounds->x + bounds->w);
        bounds->x -= (float)*layout->offset_x;
        bounds->y = layout->at_y + layout->row.item.y;
        bounds->y -= (float)*layout->offset_y;
        bounds->h = layout->row.item.h;
        return;
    } break;
    case NK_LAYOUT_STATIC: {
        /* non-scaling array of panel pixel width for every widget */
        item_spacing = (float)layout->row.index * spacing.x;
        item_width = layout->row.ratio[layout->row.index];
        item_offset = layout->row.item_offset;
        if (modify) layout->row.item_offset += item_width;
    } break;
    case NK_LAYOUT_TEMPLATE: {
        /* stretchy row layout with combined dynamic/static widget width*/
        NK_ASSERT(layout->row.index < layout->row.columns);
        NK_ASSERT(layout->row.index < NK_MAX_LAYOUT_ROW_TEMPLATE_COLUMNS);
        item_width = layout->row.templates[layout->row.index];
        item_offset = layout->row.item_offset;
        item_spacing = (float)layout->row.index * spacing.x;
        if (modify) layout->row.item_offset += item_width;
    } break;
    default: NK_ASSERT(0); break;
    };

    /* set the bounds of the newly allocated widget */
    bounds->w = item_width;
    bounds->h = layout->row.height - spacing.y;
    bounds->y = layout->at_y - (float)*layout->offset_y;
    bounds->x = layout->at_x + item_offset + item_spacing + padding.x;
    if (((bounds->x + bounds->w) > layout->max_x) && modify)
        layout->max_x = bounds->x + bounds->w;
    bounds->x -= (float)*layout->offset_x;
}

NK_INTERN void
nk_panel_alloc_space(struct nk_rect *bounds, const struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    /* check if the end of the row has been hit and begin new row if so */
    win = ctx->current;
    layout = win->layout;
    if (layout->row.index >= layout->row.columns)
        nk_panel_alloc_row(ctx, win);

    /* calculate widget position and size */
    nk_layout_widget_space(bounds, ctx, win, nk_true);
    layout->row.index++;
}

NK_INTERN void
nk_layout_peek(struct nk_rect *bounds, struct nk_context *ctx)
{
    float y;
    int index;
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    y = layout->at_y;
    index = layout->row.index;
    if (layout->row.index >= layout->row.columns) {
        layout->at_y += layout->row.height;
        layout->row.index = 0;
    }
    nk_layout_widget_space(bounds, ctx, win, nk_false);
    layout->at_y = y;
    layout->row.index = index;
}

NK_INTERN int
nk_tree_state_base(struct nk_context *ctx, enum nk_tree_type type,
    struct nk_image *img, const char *title, enum nk_collapse_states *state)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_style *style;
    struct nk_command_buffer *out;
    const struct nk_input *in;
    const struct nk_style_button *button;
    enum nk_symbol_type symbol;
    float row_height;

    struct nk_vec2 item_spacing;
    struct nk_rect header = {0,0,0,0};
    struct nk_rect sym = {0,0,0,0};
    struct nk_text text;

    nk_flags ws = 0;
    enum nk_widget_layout_states widget_state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    /* cache some data */
    win = ctx->current;
    layout = win->layout;
    out = &win->buffer;
    style = &ctx->style;
    item_spacing = style->window.spacing;

    /* calculate header bounds and draw background */
    row_height = style->font->height + 2 * style->tab.padding.y;
    nk_layout_set_min_row_height(ctx, row_height);
    nk_layout_row_dynamic(ctx, row_height, 1);
    nk_layout_reset_min_row_height(ctx);

    widget_state = nk_widget(&header, ctx);
    if (type == NK_TREE_TAB) {
        const struct nk_style_item *background = &style->tab.background;
        if (background->type == NK_STYLE_ITEM_IMAGE) {
            nk_draw_image(out, header, &background->data.image, nk_white);
            text.background = nk_rgba(0,0,0,0);
        } else {
            text.background = background->data.color;
            nk_fill_rect(out, header, 0, style->tab.border_color);
            nk_fill_rect(out, nk_shrink_rect(header, style->tab.border),
                style->tab.rounding, background->data.color);
        }
    } else text.background = style->window.background;

    /* update node state */
    in = (!(layout->flags & NK_WINDOW_ROM)) ? &ctx->input: 0;
    in = (in && widget_state == NK_WIDGET_VALID) ? &ctx->input : 0;
    if (nk_button_behavior(&ws, header, in, NK_BUTTON_DEFAULT))
        *state = (*state == NK_MAXIMIZED) ? NK_MINIMIZED : NK_MAXIMIZED;

    /* select correct button style */
    if (*state == NK_MAXIMIZED) {
        symbol = style->tab.sym_maximize;
        if (type == NK_TREE_TAB)
            button = &style->tab.tab_maximize_button;
        else button = &style->tab.node_maximize_button;
    } else {
        symbol = style->tab.sym_minimize;
        if (type == NK_TREE_TAB)
            button = &style->tab.tab_minimize_button;
        else button = &style->tab.node_minimize_button;
    }

    {/* draw triangle button */
    sym.w = sym.h = style->font->height;
    sym.y = header.y + style->tab.padding.y;
    sym.x = header.x + style->tab.padding.x;
    nk_do_button_symbol(&ws, &win->buffer, sym, symbol, NK_BUTTON_DEFAULT,
        button, 0, style->font);

    if (img) {
        /* draw optional image icon */
        sym.x = sym.x + sym.w + 4 * item_spacing.x;
        nk_draw_image(&win->buffer, sym, img, nk_white);
        sym.w = style->font->height + style->tab.spacing.x;}
    }

    {/* draw label */
    struct nk_rect label;
    header.w = NK_MAX(header.w, sym.w + item_spacing.x);
    label.x = sym.x + sym.w + item_spacing.x;
    label.y = sym.y;
    label.w = header.w - (sym.w + item_spacing.y + style->tab.indent);
    label.h = style->font->height;
    text.text = style->tab.text;
    text.padding = nk_vec2(0,0);
    nk_widget_text(out, label, title, nk_strlen(title), &text,
        NK_TEXT_LEFT, style->font);}

    /* increase x-axis cursor widget position pointer */
    if (*state == NK_MAXIMIZED) {
        layout->at_x = header.x + (float)*layout->offset_x + style->tab.indent;
        layout->bounds.w = NK_MAX(layout->bounds.w, style->tab.indent);
        layout->bounds.w -= (style->tab.indent + style->window.padding.x);
        layout->row.tree_depth++;
        return nk_true;
    } else return nk_false;
}

NK_INTERN int
nk_tree_base(struct nk_context *ctx, enum nk_tree_type type,
    struct nk_image *img, const char *title, enum nk_collapse_states initial_state,
    const char *hash, int len, int line)
{
    struct nk_window *win = ctx->current;
    int title_len = 0;
    nk_hash tree_hash = 0;
    nk_uint *state = 0;

    /* retrieve tree state from internal widget state tables */
    if (!hash) {
        title_len = (int)nk_strlen(title);
        tree_hash = nk_murmur_hash(title, (int)title_len, (nk_hash)line);
    } else tree_hash = nk_murmur_hash(hash, len, (nk_hash)line);
    state = nk_find_value(win, tree_hash);
    if (!state) {
        state = nk_add_value(ctx, win, tree_hash, 0);
        *state = initial_state;
    }
    return nk_tree_state_base(ctx, type, img, title, (enum nk_collapse_states*)state);
}

NK_API int
nk_tree_state_push(struct nk_context *ctx, enum nk_tree_type type,
    const char *title, enum nk_collapse_states *state)
{return nk_tree_state_base(ctx, type, 0, title, state);}

NK_API int
nk_tree_state_image_push(struct nk_context *ctx, enum nk_tree_type type,
    struct nk_image img, const char *title, enum nk_collapse_states *state)
{return nk_tree_state_base(ctx, type, &img, title, state);}

NK_API void
nk_tree_state_pop(struct nk_context *ctx)
{
    struct nk_window *win = 0;
    struct nk_panel *layout = 0;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    layout->at_x -= ctx->style.tab.indent + ctx->style.window.padding.x;
    layout->bounds.w += ctx->style.tab.indent + ctx->style.window.padding.x;
    NK_ASSERT(layout->row.tree_depth);
    layout->row.tree_depth--;
}

NK_API int
nk_tree_push_hashed(struct nk_context *ctx, enum nk_tree_type type,
    const char *title, enum nk_collapse_states initial_state,
    const char *hash, int len, int line)
{return nk_tree_base(ctx, type, 0, title, initial_state, hash, len, line);}

NK_API int
nk_tree_image_push_hashed(struct nk_context *ctx, enum nk_tree_type type,
    struct nk_image img, const char *title, enum nk_collapse_states initial_state,
    const char *hash, int len,int seed)
{return nk_tree_base(ctx, type, &img, title, initial_state, hash, len, seed);}

NK_API void
nk_tree_pop(struct nk_context *ctx)
{nk_tree_state_pop(ctx);}

/*----------------------------------------------------------------
 *
 *                          WIDGETS
 *
 * --------------------------------------------------------------*/
NK_API struct nk_rect
nk_widget_bounds(struct nk_context *ctx)
{
    struct nk_rect bounds;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current)
        return nk_rect(0,0,0,0);
    nk_layout_peek(&bounds, ctx);
    return bounds;
}

NK_API struct nk_vec2
nk_widget_position(struct nk_context *ctx)
{
    struct nk_rect bounds;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current)
        return nk_vec2(0,0);

    nk_layout_peek(&bounds, ctx);
    return nk_vec2(bounds.x, bounds.y);
}

NK_API struct nk_vec2
nk_widget_size(struct nk_context *ctx)
{
    struct nk_rect bounds;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current)
        return nk_vec2(0,0);

    nk_layout_peek(&bounds, ctx);
    return nk_vec2(bounds.w, bounds.h);
}

NK_API float
nk_widget_width(struct nk_context *ctx)
{
    struct nk_rect bounds;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current)
        return 0;

    nk_layout_peek(&bounds, ctx);
    return bounds.w;
}

NK_API float
nk_widget_height(struct nk_context *ctx)
{
    struct nk_rect bounds;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current)
        return 0;

    nk_layout_peek(&bounds, ctx);
    return bounds.h;
}

NK_API int
nk_widget_is_hovered(struct nk_context *ctx)
{
    struct nk_rect c, v;
    struct nk_rect bounds;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current || ctx->active != ctx->current)
        return 0;

    c = ctx->current->layout->clip;
    c.x = (float)((int)c.x);
    c.y = (float)((int)c.y);
    c.w = (float)((int)c.w);
    c.h = (float)((int)c.h);

    nk_layout_peek(&bounds, ctx);
    nk_unify(&v, &c, bounds.x, bounds.y, bounds.x + bounds.w, bounds.y + bounds.h);
    if (!NK_INTERSECT(c.x, c.y, c.w, c.h, bounds.x, bounds.y, bounds.w, bounds.h))
        return 0;
    return nk_input_is_mouse_hovering_rect(&ctx->input, bounds);
}

NK_API int
nk_widget_is_mouse_clicked(struct nk_context *ctx, enum nk_buttons btn)
{
    struct nk_rect c, v;
    struct nk_rect bounds;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current || ctx->active != ctx->current)
        return 0;

    c = ctx->current->layout->clip;
    c.x = (float)((int)c.x);
    c.y = (float)((int)c.y);
    c.w = (float)((int)c.w);
    c.h = (float)((int)c.h);

    nk_layout_peek(&bounds, ctx);
    nk_unify(&v, &c, bounds.x, bounds.y, bounds.x + bounds.w, bounds.y + bounds.h);
    if (!NK_INTERSECT(c.x, c.y, c.w, c.h, bounds.x, bounds.y, bounds.w, bounds.h))
        return 0;
    return nk_input_mouse_clicked(&ctx->input, btn, bounds);
}

NK_API int
nk_widget_has_mouse_click_down(struct nk_context *ctx, enum nk_buttons btn, int down)
{
    struct nk_rect c, v;
    struct nk_rect bounds;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current || ctx->active != ctx->current)
        return 0;

    c = ctx->current->layout->clip;
    c.x = (float)((int)c.x);
    c.y = (float)((int)c.y);
    c.w = (float)((int)c.w);
    c.h = (float)((int)c.h);

    nk_layout_peek(&bounds, ctx);
    nk_unify(&v, &c, bounds.x, bounds.y, bounds.x + bounds.w, bounds.y + bounds.h);
    if (!NK_INTERSECT(c.x, c.y, c.w, c.h, bounds.x, bounds.y, bounds.w, bounds.h))
        return 0;
    return nk_input_has_mouse_click_down_in_rect(&ctx->input, btn, bounds, down);
}

NK_API enum nk_widget_layout_states
nk_widget(struct nk_rect *bounds, const struct nk_context *ctx)
{
    struct nk_rect c, v;
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return NK_WIDGET_INVALID;

    /* allocate space and check if the widget needs to be updated and drawn */
    nk_panel_alloc_space(bounds, ctx);
    win = ctx->current;
    layout = win->layout;
    in = &ctx->input;
    c = layout->clip;

    /*  if one of these triggers you forgot to add an `if` condition around either
        a window, group, popup, combobox or contextual menu `begin` and `end` block.
        Example:
            if (nk_begin(...) {...} nk_end(...); or
            if (nk_group_begin(...) { nk_group_end(...);} */
    NK_ASSERT(!(layout->flags & NK_WINDOW_MINIMIZED));
    NK_ASSERT(!(layout->flags & NK_WINDOW_HIDDEN));
    NK_ASSERT(!(layout->flags & NK_WINDOW_CLOSED));

    /* need to convert to int here to remove floating point errors */
    bounds->x = (float)((int)bounds->x);
    bounds->y = (float)((int)bounds->y);
    bounds->w = (float)((int)bounds->w);
    bounds->h = (float)((int)bounds->h);

    c.x = (float)((int)c.x);
    c.y = (float)((int)c.y);
    c.w = (float)((int)c.w);
    c.h = (float)((int)c.h);

    nk_unify(&v, &c, bounds->x, bounds->y, bounds->x + bounds->w, bounds->y + bounds->h);
    if (!NK_INTERSECT(c.x, c.y, c.w, c.h, bounds->x, bounds->y, bounds->w, bounds->h))
        return NK_WIDGET_INVALID;
    if (!NK_INBOX(in->mouse.pos.x, in->mouse.pos.y, v.x, v.y, v.w, v.h))
        return NK_WIDGET_ROM;
    return NK_WIDGET_VALID;
}

NK_API enum nk_widget_layout_states
nk_widget_fitting(struct nk_rect *bounds, struct nk_context *ctx,
    struct nk_vec2 item_padding)
{
    /* update the bounds to stand without padding  */
    struct nk_window *win;
    struct nk_style *style;
    struct nk_panel *layout;
    enum nk_widget_layout_states state;
    struct nk_vec2 panel_padding;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return NK_WIDGET_INVALID;

    win = ctx->current;
    style = &ctx->style;
    layout = win->layout;
    state = nk_widget(bounds, ctx);

    panel_padding = nk_panel_get_padding(style, layout->type);
    if (layout->row.index == 1) {
        bounds->w += panel_padding.x;
        bounds->x -= panel_padding.x;
    } else bounds->x -= item_padding.x;

    if (layout->row.index == layout->row.columns)
        bounds->w += panel_padding.x;
    else bounds->w += item_padding.x;
    return state;
}

/*----------------------------------------------------------------
 *
 *                          MISC
 *
 * --------------------------------------------------------------*/
NK_API void
nk_spacing(struct nk_context *ctx, int cols)
{
    struct nk_window *win;
    struct nk_panel *layout;
    struct nk_rect none;
    int i, index, rows;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    /* spacing over row boundaries */
    win = ctx->current;
    layout = win->layout;
    index = (layout->row.index + cols) % layout->row.columns;
    rows = (layout->row.index + cols) / layout->row.columns;
    if (rows) {
        for (i = 0; i < rows; ++i)
            nk_panel_alloc_row(ctx, win);
        cols = index;
    }
    /* non table layout need to allocate space */
    if (layout->row.type != NK_LAYOUT_DYNAMIC_FIXED &&
        layout->row.type != NK_LAYOUT_STATIC_FIXED) {
        for (i = 0; i < cols; ++i)
            nk_panel_alloc_space(&none, ctx);
    }
    layout->row.index = index;
}

/*----------------------------------------------------------------
 *
 *                          TEXT
 *
 * --------------------------------------------------------------*/
NK_API void
nk_text_colored(struct nk_context *ctx, const char *str, int len,
    nk_flags alignment, struct nk_color color)
{
    struct nk_window *win;
    const struct nk_style *style;

    struct nk_vec2 item_padding;
    struct nk_rect bounds;
    struct nk_text text;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout) return;

    win = ctx->current;
    style = &ctx->style;
    nk_panel_alloc_space(&bounds, ctx);
    item_padding = style->text.padding;

    text.padding.x = item_padding.x;
    text.padding.y = item_padding.y;
    text.background = style->window.background;
    text.text = color;
    nk_widget_text(&win->buffer, bounds, str, len, &text, alignment, style->font);
}

NK_API void
nk_text_wrap_colored(struct nk_context *ctx, const char *str,
    int len, struct nk_color color)
{
    struct nk_window *win;
    const struct nk_style *style;

    struct nk_vec2 item_padding;
    struct nk_rect bounds;
    struct nk_text text;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout) return;

    win = ctx->current;
    style = &ctx->style;
    nk_panel_alloc_space(&bounds, ctx);
    item_padding = style->text.padding;

    text.padding.x = item_padding.x;
    text.padding.y = item_padding.y;
    text.background = style->window.background;
    text.text = color;
    nk_widget_text_wrap(&win->buffer, bounds, str, len, &text, style->font);
}

#ifdef NK_INCLUDE_STANDARD_VARARGS
NK_API void
nk_labelf_colored(struct nk_context *ctx, nk_flags flags,
    struct nk_color color, const char *fmt, ...)
{
    char buf[256];
    va_list args;
    va_start(args, fmt);
    nk_strfmt(buf, NK_LEN(buf), fmt, args);
    nk_label_colored(ctx, buf, flags, color);
    va_end(args);
}

NK_API void
nk_labelf_colored_wrap(struct nk_context *ctx, struct nk_color color,
    const char *fmt, ...)
{
    char buf[256];
    va_list args;
    va_start(args, fmt);
    nk_strfmt(buf, NK_LEN(buf), fmt, args);
    nk_label_colored_wrap(ctx, buf, color);
    va_end(args);
}

NK_API void
nk_labelf(struct nk_context *ctx, nk_flags flags, const char *fmt, ...)
{
    char buf[256];
    va_list args;
    va_start(args, fmt);
    nk_strfmt(buf, NK_LEN(buf), fmt, args);
    nk_label(ctx, buf, flags);
    va_end(args);
}

NK_API void
nk_labelf_wrap(struct nk_context *ctx, const char *fmt,...)
{
    char buf[256];
    va_list args;
    va_start(args, fmt);
    nk_strfmt(buf, NK_LEN(buf), fmt, args);
    nk_label_wrap(ctx, buf);
    va_end(args);
}

NK_API void
nk_value_bool(struct nk_context *ctx, const char *prefix, int value)
{nk_labelf(ctx, NK_TEXT_LEFT, "%s: %s", prefix, ((value) ? "true": "false"));}

NK_API void
nk_value_int(struct nk_context *ctx, const char *prefix, int value)
{nk_labelf(ctx, NK_TEXT_LEFT, "%s: %d", prefix, value);}

NK_API void
nk_value_uint(struct nk_context *ctx, const char *prefix, unsigned int value)
{nk_labelf(ctx, NK_TEXT_LEFT, "%s: %u", prefix, value);}

NK_API void
nk_value_float(struct nk_context *ctx, const char *prefix, float value)
{
    double double_value = (double)value;
    nk_labelf(ctx, NK_TEXT_LEFT, "%s: %.3f", prefix, double_value);
}

NK_API void
nk_value_color_byte(struct nk_context *ctx, const char *p, struct nk_color c)
{nk_labelf(ctx, NK_TEXT_LEFT, "%s: (%d, %d, %d, %d)", p, c.r, c.g, c.b, c.a);}

NK_API void
nk_value_color_float(struct nk_context *ctx, const char *p, struct nk_color color)
{
    double c[4]; nk_color_dv(c, color);
    nk_labelf(ctx, NK_TEXT_LEFT, "%s: (%.2f, %.2f, %.2f, %.2f)",
        p, c[0], c[1], c[2], c[3]);
}

NK_API void
nk_value_color_hex(struct nk_context *ctx, const char *prefix, struct nk_color color)
{
    char hex[16];
    nk_color_hex_rgba(hex, color);
    nk_labelf(ctx, NK_TEXT_LEFT, "%s: %s", prefix, hex);
}
#endif

NK_API void
nk_text(struct nk_context *ctx, const char *str, int len, nk_flags alignment)
{
    NK_ASSERT(ctx);
    if (!ctx) return;
    nk_text_colored(ctx, str, len, alignment, ctx->style.text.color);
}

NK_API void
nk_text_wrap(struct nk_context *ctx, const char *str, int len)
{
    NK_ASSERT(ctx);
    if (!ctx) return;
    nk_text_wrap_colored(ctx, str, len, ctx->style.text.color);
}

NK_API void
nk_label(struct nk_context *ctx, const char *str, nk_flags alignment)
{nk_text(ctx, str, nk_strlen(str), alignment);}

NK_API void
nk_label_colored(struct nk_context *ctx, const char *str, nk_flags align,
    struct nk_color color)
{nk_text_colored(ctx, str, nk_strlen(str), align, color);}

NK_API void
nk_label_wrap(struct nk_context *ctx, const char *str)
{nk_text_wrap(ctx, str, nk_strlen(str));}

NK_API void
nk_label_colored_wrap(struct nk_context *ctx, const char *str, struct nk_color color)
{nk_text_wrap_colored(ctx, str, nk_strlen(str), color);}

NK_API void
nk_image(struct nk_context *ctx, struct nk_image img)
{
    struct nk_window *win;
    struct nk_rect bounds;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout) return;

    win = ctx->current;
    if (!nk_widget(&bounds, ctx)) return;
    nk_draw_image(&win->buffer, bounds, &img, nk_white);
}

/*----------------------------------------------------------------
 *
 *                          BUTTON
 *
 * --------------------------------------------------------------*/
NK_API void
nk_button_set_behavior(struct nk_context *ctx, enum nk_button_behavior behavior)
{
    NK_ASSERT(ctx);
    if (!ctx) return;
    ctx->button_behavior = behavior;
}

NK_API int
nk_button_push_behavior(struct nk_context *ctx, enum nk_button_behavior behavior)
{
    struct nk_config_stack_button_behavior *button_stack;
    struct nk_config_stack_button_behavior_element *element;

    NK_ASSERT(ctx);
    if (!ctx) return 0;

    button_stack = &ctx->stacks.button_behaviors;
    NK_ASSERT(button_stack->head < (int)NK_LEN(button_stack->elements));
    if (button_stack->head >= (int)NK_LEN(button_stack->elements))
        return 0;

    element = &button_stack->elements[button_stack->head++];
    element->address = &ctx->button_behavior;
    element->old_value = ctx->button_behavior;
    ctx->button_behavior = behavior;
    return 1;
}

NK_API int
nk_button_pop_behavior(struct nk_context *ctx)
{
    struct nk_config_stack_button_behavior *button_stack;
    struct nk_config_stack_button_behavior_element *element;

    NK_ASSERT(ctx);
    if (!ctx) return 0;

    button_stack = &ctx->stacks.button_behaviors;
    NK_ASSERT(button_stack->head > 0);
    if (button_stack->head < 1)
        return 0;

    element = &button_stack->elements[--button_stack->head];
    *element->address = element->old_value;
    return 1;
}

NK_API int
nk_button_text_styled(struct nk_context *ctx,
    const struct nk_style_button *style, const char *title, int len)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(style);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!style || !ctx || !ctx->current || !ctx->current->layout) return 0;

    win = ctx->current;
    layout = win->layout;
    state = nk_widget(&bounds, ctx);

    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    return nk_do_button_text(&ctx->last_widget_state, &win->buffer, bounds,
                    title, len, style->text_alignment, ctx->button_behavior,
                    style, in, ctx->style.font);
}

NK_API int
nk_button_text(struct nk_context *ctx, const char *title, int len)
{
    NK_ASSERT(ctx);
    if (!ctx) return 0;
    return nk_button_text_styled(ctx, &ctx->style.button, title, len);
}

NK_API int nk_button_label_styled(struct nk_context *ctx,
    const struct nk_style_button *style, const char *title)
{return nk_button_text_styled(ctx, style, title, nk_strlen(title));}

NK_API int nk_button_label(struct nk_context *ctx, const char *title)
{return nk_button_text(ctx, title, nk_strlen(title));}

NK_API int
nk_button_color(struct nk_context *ctx, struct nk_color color)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;
    struct nk_style_button button;

    int ret = 0;
    struct nk_rect bounds;
    struct nk_rect content;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    layout = win->layout;

    state = nk_widget(&bounds, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;

    button = ctx->style.button;
    button.normal = nk_style_item_color(color);
    button.hover = nk_style_item_color(color);
    button.active = nk_style_item_color(color);
    ret = nk_do_button(&ctx->last_widget_state, &win->buffer, bounds,
                &button, in, ctx->button_behavior, &content);
    nk_draw_button(&win->buffer, &bounds, ctx->last_widget_state, &button);
    return ret;
}

NK_API int
nk_button_symbol_styled(struct nk_context *ctx,
    const struct nk_style_button *style, enum nk_symbol_type symbol)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    layout = win->layout;
    state = nk_widget(&bounds, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    return nk_do_button_symbol(&ctx->last_widget_state, &win->buffer, bounds,
            symbol, ctx->button_behavior, style, in, ctx->style.font);
}

NK_API int
nk_button_symbol(struct nk_context *ctx, enum nk_symbol_type symbol)
{
    NK_ASSERT(ctx);
    if (!ctx) return 0;
    return nk_button_symbol_styled(ctx, &ctx->style.button, symbol);
}

NK_API int
nk_button_image_styled(struct nk_context *ctx, const struct nk_style_button *style,
    struct nk_image img)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    layout = win->layout;

    state = nk_widget(&bounds, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    return nk_do_button_image(&ctx->last_widget_state, &win->buffer, bounds,
                img, ctx->button_behavior, style, in);
}

NK_API int
nk_button_image(struct nk_context *ctx, struct nk_image img)
{
    NK_ASSERT(ctx);
    if (!ctx) return 0;
    return nk_button_image_styled(ctx, &ctx->style.button, img);
}

NK_API int
nk_button_symbol_text_styled(struct nk_context *ctx,
    const struct nk_style_button *style, enum nk_symbol_type symbol,
    const char *text, int len, nk_flags align)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    layout = win->layout;

    state = nk_widget(&bounds, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    return nk_do_button_text_symbol(&ctx->last_widget_state, &win->buffer, bounds,
                symbol, text, len, align, ctx->button_behavior,
                style, ctx->style.font, in);
}

NK_API int
nk_button_symbol_text(struct nk_context *ctx, enum nk_symbol_type symbol,
    const char* text, int len, nk_flags align)
{
    NK_ASSERT(ctx);
    if (!ctx) return 0;
    return nk_button_symbol_text_styled(ctx, &ctx->style.button, symbol, text, len, align);
}

NK_API int nk_button_symbol_label(struct nk_context *ctx, enum nk_symbol_type symbol,
    const char *label, nk_flags align)
{return nk_button_symbol_text(ctx, symbol, label, nk_strlen(label), align);}

NK_API int nk_button_symbol_label_styled(struct nk_context *ctx,
    const struct nk_style_button *style, enum nk_symbol_type symbol,
    const char *title, nk_flags align)
{return nk_button_symbol_text_styled(ctx, style, symbol, title, nk_strlen(title), align);}

NK_API int
nk_button_image_text_styled(struct nk_context *ctx,
    const struct nk_style_button *style, struct nk_image img, const char *text,
    int len, nk_flags align)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    layout = win->layout;

    state = nk_widget(&bounds, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    return nk_do_button_text_image(&ctx->last_widget_state, &win->buffer,
            bounds, img, text, len, align, ctx->button_behavior,
            style, ctx->style.font, in);
}

NK_API int
nk_button_image_text(struct nk_context *ctx, struct nk_image img,
    const char *text, int len, nk_flags align)
{return nk_button_image_text_styled(ctx, &ctx->style.button,img, text, len, align);}


NK_API int nk_button_image_label(struct nk_context *ctx, struct nk_image img,
    const char *label, nk_flags align)
{return nk_button_image_text(ctx, img, label, nk_strlen(label), align);}

NK_API int nk_button_image_label_styled(struct nk_context *ctx,
    const struct nk_style_button *style, struct nk_image img,
    const char *label, nk_flags text_alignment)
{return nk_button_image_text_styled(ctx, style, img, label, nk_strlen(label), text_alignment);}

/*----------------------------------------------------------------
 *
 *                          SELECTABLE
 *
 * --------------------------------------------------------------*/
NK_API int
nk_selectable_text(struct nk_context *ctx, const char *str, int len,
    nk_flags align, int *value)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;
    const struct nk_style *style;

    enum nk_widget_layout_states state;
    struct nk_rect bounds;

    NK_ASSERT(ctx);
    NK_ASSERT(value);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout || !value)
        return 0;

    win = ctx->current;
    layout = win->layout;
    style = &ctx->style;

    state = nk_widget(&bounds, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    return nk_do_selectable(&ctx->last_widget_state, &win->buffer, bounds,
                str, len, align, value, &style->selectable, in, style->font);
}

NK_API int
nk_selectable_image_text(struct nk_context *ctx, struct nk_image img,
    const char *str, int len, nk_flags align, int *value)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;
    const struct nk_style *style;

    enum nk_widget_layout_states state;
    struct nk_rect bounds;

    NK_ASSERT(ctx);
    NK_ASSERT(value);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout || !value)
        return 0;

    win = ctx->current;
    layout = win->layout;
    style = &ctx->style;

    state = nk_widget(&bounds, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    return nk_do_selectable_image(&ctx->last_widget_state, &win->buffer, bounds,
                str, len, align, value, &img, &style->selectable, in, style->font);
}

NK_API int nk_select_text(struct nk_context *ctx, const char *str, int len,
    nk_flags align, int value)
{nk_selectable_text(ctx, str, len, align, &value);return value;}

NK_API int nk_selectable_label(struct nk_context *ctx, const char *str, nk_flags align, int *value)
{return nk_selectable_text(ctx, str, nk_strlen(str), align, value);}

NK_API int nk_selectable_image_label(struct nk_context *ctx,struct nk_image img,
    const char *str, nk_flags align, int *value)
{return nk_selectable_image_text(ctx, img, str, nk_strlen(str), align, value);}

NK_API int nk_select_label(struct nk_context *ctx, const char *str, nk_flags align, int value)
{nk_selectable_text(ctx, str, nk_strlen(str), align, &value);return value;}

NK_API int nk_select_image_label(struct nk_context *ctx, struct nk_image img,
    const char *str, nk_flags align, int value)
{nk_selectable_image_text(ctx, img, str, nk_strlen(str), align, &value);return value;}

NK_API int nk_select_image_text(struct nk_context *ctx, struct nk_image img,
    const char *str, int len, nk_flags align, int value)
{nk_selectable_image_text(ctx, img, str, len, align, &value);return value;}

/*----------------------------------------------------------------
 *
 *                          CHECKBOX
 *
 * --------------------------------------------------------------*/
NK_API int
nk_check_text(struct nk_context *ctx, const char *text, int len, int active)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;
    const struct nk_style *style;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return active;

    win = ctx->current;
    style = &ctx->style;
    layout = win->layout;

    state = nk_widget(&bounds, ctx);
    if (!state) return active;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    nk_do_toggle(&ctx->last_widget_state, &win->buffer, bounds, &active,
        text, len, NK_TOGGLE_CHECK, &style->checkbox, in, style->font);
    return active;
}

NK_API unsigned int
nk_check_flags_text(struct nk_context *ctx, const char *text, int len,
    unsigned int flags, unsigned int value)
{
    int old_active;
    NK_ASSERT(ctx);
    NK_ASSERT(text);
    if (!ctx || !text) return flags;
    old_active = (int)((flags & value) & value);
    if (nk_check_text(ctx, text, len, old_active))
        flags |= value;
    else flags &= ~value;
    return flags;
}

NK_API int
nk_checkbox_text(struct nk_context *ctx, const char *text, int len, int *active)
{
    int old_val;
    NK_ASSERT(ctx);
    NK_ASSERT(text);
    NK_ASSERT(active);
    if (!ctx || !text || !active) return 0;
    old_val = *active;
    *active = nk_check_text(ctx, text, len, *active);
    return old_val != *active;
}

NK_API int
nk_checkbox_flags_text(struct nk_context *ctx, const char *text, int len,
    unsigned int *flags, unsigned int value)
{
    int active;
    NK_ASSERT(ctx);
    NK_ASSERT(text);
    NK_ASSERT(flags);
    if (!ctx || !text || !flags) return 0;

    active = (int)((*flags & value) & value);
    if (nk_checkbox_text(ctx, text, len, &active)) {
        if (active) *flags |= value;
        else *flags &= ~value;
        return 1;
    }
    return 0;
}

NK_API int nk_check_label(struct nk_context *ctx, const char *label, int active)
{return nk_check_text(ctx, label, nk_strlen(label), active);}

NK_API unsigned int nk_check_flags_label(struct nk_context *ctx, const char *label,
    unsigned int flags, unsigned int value)
{return nk_check_flags_text(ctx, label, nk_strlen(label), flags, value);}

NK_API int nk_checkbox_label(struct nk_context *ctx, const char *label, int *active)
{return nk_checkbox_text(ctx, label, nk_strlen(label), active);}

NK_API int nk_checkbox_flags_label(struct nk_context *ctx, const char *label,
    unsigned int *flags, unsigned int value)
{return nk_checkbox_flags_text(ctx, label, nk_strlen(label), flags, value);}

/*----------------------------------------------------------------
 *
 *                          OPTION
 *
 * --------------------------------------------------------------*/
NK_API int
nk_option_text(struct nk_context *ctx, const char *text, int len, int is_active)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_input *in;
    const struct nk_style *style;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return is_active;

    win = ctx->current;
    style = &ctx->style;
    layout = win->layout;

    state = nk_widget(&bounds, ctx);
    if (!state) return state;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    nk_do_toggle(&ctx->last_widget_state, &win->buffer, bounds, &is_active,
        text, len, NK_TOGGLE_OPTION, &style->option, in, style->font);
    return is_active;
}

NK_API int
nk_radio_text(struct nk_context *ctx, const char *text, int len, int *active)
{
    int old_value;
    NK_ASSERT(ctx);
    NK_ASSERT(text);
    NK_ASSERT(active);
    if (!ctx || !text || !active) return 0;
    old_value = *active;
    *active = nk_option_text(ctx, text, len, old_value);
    return old_value != *active;
}

NK_API int
nk_option_label(struct nk_context *ctx, const char *label, int active)
{return nk_option_text(ctx, label, nk_strlen(label), active);}

NK_API int
nk_radio_label(struct nk_context *ctx, const char *label, int *active)
{return nk_radio_text(ctx, label, nk_strlen(label), active);}

/*----------------------------------------------------------------
 *
 *                          SLIDER
 *
 * --------------------------------------------------------------*/
NK_API int
nk_slider_float(struct nk_context *ctx, float min_value, float *value, float max_value,
    float value_step)
{
    struct nk_window *win;
    struct nk_panel *layout;
    struct nk_input *in;
    const struct nk_style *style;

    int ret = 0;
    float old_value;
    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    NK_ASSERT(value);
    if (!ctx || !ctx->current || !ctx->current->layout || !value)
        return ret;

    win = ctx->current;
    style = &ctx->style;
    layout = win->layout;

    state = nk_widget(&bounds, ctx);
    if (!state) return ret;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;

    old_value = *value;
    *value = nk_do_slider(&ctx->last_widget_state, &win->buffer, bounds, min_value,
                old_value, max_value, value_step, &style->slider, in, style->font);
    return (old_value > *value || old_value < *value);
}

NK_API float
nk_slide_float(struct nk_context *ctx, float min, float val, float max, float step)
{
    nk_slider_float(ctx, min, &val, max, step); return val;
}

NK_API int
nk_slide_int(struct nk_context *ctx, int min, int val, int max, int step)
{
    float value = (float)val;
    nk_slider_float(ctx, (float)min, &value, (float)max, (float)step);
    return (int)value;
}

NK_API int
nk_slider_int(struct nk_context *ctx, int min, int *val, int max, int step)
{
    int ret;
    float value = (float)*val;
    ret = nk_slider_float(ctx, (float)min, &value, (float)max, (float)step);
    *val =  (int)value;
    return ret;
}

/*----------------------------------------------------------------
 *
 *                          PROGRESSBAR
 *
 * --------------------------------------------------------------*/
NK_API int
nk_progress(struct nk_context *ctx, nk_size *cur, nk_size max, int is_modifyable)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_style *style;
    const struct nk_input *in;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;
    nk_size old_value;

    NK_ASSERT(ctx);
    NK_ASSERT(cur);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout || !cur)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    layout = win->layout;
    state = nk_widget(&bounds, ctx);
    if (!state) return 0;

    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    old_value = *cur;
    *cur = nk_do_progress(&ctx->last_widget_state, &win->buffer, bounds,
            *cur, max, is_modifyable, &style->progress, in);
    return (*cur != old_value);
}

NK_API nk_size nk_prog(struct nk_context *ctx, nk_size cur, nk_size max, int modifyable)
{nk_progress(ctx, &cur, max, modifyable);return cur;}

/*----------------------------------------------------------------
 *
 *                          EDIT
 *
 * --------------------------------------------------------------*/
NK_API void
nk_edit_focus(struct nk_context *ctx, nk_flags flags)
{
    nk_hash hash;
    struct nk_window *win;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return;

    win = ctx->current;
    hash = win->edit.seq;
    win->edit.active = nk_true;
    win->edit.name = hash;
    if (flags & NK_EDIT_ALWAYS_INSERT_MODE)
        win->edit.mode = NK_TEXT_EDIT_MODE_INSERT;
}

NK_API void
nk_edit_unfocus(struct nk_context *ctx)
{
    struct nk_window *win;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return;

    win = ctx->current;
    win->edit.active = nk_false;
    win->edit.name = 0;
}

NK_API nk_flags
nk_edit_string(struct nk_context *ctx, nk_flags flags,
    char *memory, int *len, int max, nk_plugin_filter filter)
{
    nk_hash hash;
    nk_flags state;
    struct nk_text_edit *edit;
    struct nk_window *win;

    NK_ASSERT(ctx);
    NK_ASSERT(memory);
    NK_ASSERT(len);
    if (!ctx || !memory || !len)
        return 0;

    filter = (!filter) ? nk_filter_default: filter;
    win = ctx->current;
    hash = win->edit.seq;
    edit = &ctx->text_edit;
    nk_textedit_clear_state(&ctx->text_edit, (flags & NK_EDIT_MULTILINE)?
        NK_TEXT_EDIT_MULTI_LINE: NK_TEXT_EDIT_SINGLE_LINE, filter);

    if (win->edit.active && hash == win->edit.name) {
        if (flags & NK_EDIT_NO_CURSOR)
            edit->cursor = nk_utf_len(memory, *len);
        else edit->cursor = win->edit.cursor;
        if (!(flags & NK_EDIT_SELECTABLE)) {
            edit->select_start = win->edit.cursor;
            edit->select_end = win->edit.cursor;
        } else {
            edit->select_start = win->edit.sel_start;
            edit->select_end = win->edit.sel_end;
        }
        edit->mode = win->edit.mode;
        edit->scrollbar.x = (float)win->edit.scrollbar.x;
        edit->scrollbar.y = (float)win->edit.scrollbar.y;
        edit->active = nk_true;
    } else edit->active = nk_false;

    max = NK_MAX(1, max);
    *len = NK_MIN(*len, max-1);
    nk_str_init_fixed(&edit->string, memory, (nk_size)max);
    edit->string.buffer.allocated = (nk_size)*len;
    edit->string.len = nk_utf_len(memory, *len);
    state = nk_edit_buffer(ctx, flags, edit, filter);
    *len = (int)edit->string.buffer.allocated;

    if (edit->active) {
        win->edit.cursor = edit->cursor;
        win->edit.sel_start = edit->select_start;
        win->edit.sel_end = edit->select_end;
        win->edit.mode = edit->mode;
        win->edit.scrollbar.x = (nk_ushort)edit->scrollbar.x;
        win->edit.scrollbar.y = (nk_ushort)edit->scrollbar.y;
    }
    return state;
}

NK_API nk_flags
nk_edit_buffer(struct nk_context *ctx, nk_flags flags,
    struct nk_text_edit *edit, nk_plugin_filter filter)
{
    struct nk_window *win;
    struct nk_style *style;
    struct nk_input *in;

    enum nk_widget_layout_states state;
    struct nk_rect bounds;

    nk_flags ret_flags = 0;
    unsigned char prev_state;
    nk_hash hash;

    /* make sure correct values */
    NK_ASSERT(ctx);
    NK_ASSERT(edit);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    state = nk_widget(&bounds, ctx);
    if (!state) return state;
    in = (win->layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;

    /* check if edit is currently hot item */
    hash = win->edit.seq++;
    if (win->edit.active && hash == win->edit.name) {
        if (flags & NK_EDIT_NO_CURSOR)
            edit->cursor = edit->string.len;
        if (!(flags & NK_EDIT_SELECTABLE)) {
            edit->select_start = edit->cursor;
            edit->select_end = edit->cursor;
        }
        if (flags & NK_EDIT_CLIPBOARD)
            edit->clip = ctx->clip;
        edit->active = win->edit.active;
    } else edit->active = nk_false;
    edit->mode = win->edit.mode;

    filter = (!filter) ? nk_filter_default: filter;
    prev_state = (unsigned char)edit->active;
    in = (flags & NK_EDIT_READ_ONLY) ? 0: in;
    ret_flags = nk_do_edit(&ctx->last_widget_state, &win->buffer, bounds, flags,
                    filter, edit, &style->edit, in, style->font);

    if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
        ctx->style.cursor_active = ctx->style.cursors[NK_CURSOR_TEXT];
    if (edit->active && prev_state != edit->active) {
        /* current edit is now hot */
        win->edit.active = nk_true;
        win->edit.name = hash;
    } else if (prev_state && !edit->active) {
        /* current edit is now cold */
        win->edit.active = nk_false;
    }
    return ret_flags;
}

NK_API nk_flags
nk_edit_string_zero_terminated(struct nk_context *ctx, nk_flags flags,
    char *buffer, int max, nk_plugin_filter filter)
{
    nk_flags result;
    int len = nk_strlen(buffer);
    result = nk_edit_string(ctx, flags, buffer, &len, max, filter);
    buffer[NK_MIN(NK_MAX(max-1,0), len)] = '\0';
    return result;
}

/*----------------------------------------------------------------
 *
 *                          PROPERTY
 *
 * --------------------------------------------------------------*/
NK_INTERN struct nk_property_variant
nk_property_variant_int(int value, int min_value, int max_value, int step)
{
    struct nk_property_variant result;
    result.kind = NK_PROPERTY_INT;
    result.value.i = value;
    result.min_value.i = min_value;
    result.max_value.i = max_value;
    result.step.i = step;
    return result;
}

NK_INTERN struct nk_property_variant
nk_property_variant_float(float value, float min_value, float max_value, float step)
{
    struct nk_property_variant result;
    result.kind = NK_PROPERTY_FLOAT;
    result.value.f = value;
    result.min_value.f = min_value;
    result.max_value.f = max_value;
    result.step.f = step;
    return result;
}

NK_INTERN struct nk_property_variant
nk_property_variant_double(double value, double min_value, double max_value,
    double step)
{
    struct nk_property_variant result;
    result.kind = NK_PROPERTY_DOUBLE;
    result.value.d = value;
    result.min_value.d = min_value;
    result.max_value.d = max_value;
    result.step.d = step;
    return result;
}

NK_INTERN void
nk_property(struct nk_context *ctx, const char *name, struct nk_property_variant *variant,
    float inc_per_pixel, const enum nk_property_filter filter)
{
    struct nk_window *win;
    struct nk_panel *layout;
    struct nk_input *in;
    const struct nk_style *style;

    struct nk_rect bounds;
    enum nk_widget_layout_states s;

    int *state = 0;
    nk_hash hash = 0;
    char *buffer = 0;
    int *len = 0;
    int *cursor = 0;
    int *select_begin = 0;
    int *select_end = 0;
    int old_state;

    char dummy_buffer[NK_MAX_NUMBER_BUFFER];
    int dummy_state = NK_PROPERTY_DEFAULT;
    int dummy_length = 0;
    int dummy_cursor = 0;
    int dummy_select_begin = 0;
    int dummy_select_end = 0;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    win = ctx->current;
    layout = win->layout;
    style = &ctx->style;
    s = nk_widget(&bounds, ctx);
    if (!s) return;

    /* calculate hash from name */
    if (name[0] == '#') {
        hash = nk_murmur_hash(name, (int)nk_strlen(name), win->property.seq++);
        name++; /* special number hash */
    } else hash = nk_murmur_hash(name, (int)nk_strlen(name), 42);

    /* check if property is currently hot item */
    if (win->property.active && hash == win->property.name) {
        buffer = win->property.buffer;
        len = &win->property.length;
        cursor = &win->property.cursor;
        state = &win->property.state;
        select_begin = &win->property.select_start;
        select_end = &win->property.select_end;
    } else {
        buffer = dummy_buffer;
        len = &dummy_length;
        cursor = &dummy_cursor;
        state = &dummy_state;
        select_begin =  &dummy_select_begin;
        select_end = &dummy_select_end;
    }

    /* execute property widget */
    old_state = *state;
    ctx->text_edit.clip = ctx->clip;
    in = ((s == NK_WIDGET_ROM && !win->property.active) ||
        layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    nk_do_property(&ctx->last_widget_state, &win->buffer, bounds, name,
        variant, inc_per_pixel, buffer, len, state, cursor, select_begin,
        select_end, &style->property, filter, in, style->font, &ctx->text_edit,
        ctx->button_behavior);

    if (in && *state != NK_PROPERTY_DEFAULT && !win->property.active) {
        /* current property is now hot */
        win->property.active = 1;
        NK_MEMCPY(win->property.buffer, buffer, (nk_size)*len);
        win->property.length = *len;
        win->property.cursor = *cursor;
        win->property.state = *state;
        win->property.name = hash;
        win->property.select_start = *select_begin;
        win->property.select_end = *select_end;
        if (*state == NK_PROPERTY_DRAG) {
            ctx->input.mouse.grab = nk_true;
            ctx->input.mouse.grabbed = nk_true;
        }
    }
    /* check if previously active property is now inactive */
    if (*state == NK_PROPERTY_DEFAULT && old_state != NK_PROPERTY_DEFAULT) {
        if (old_state == NK_PROPERTY_DRAG) {
            ctx->input.mouse.grab = nk_false;
            ctx->input.mouse.grabbed = nk_false;
            ctx->input.mouse.ungrab = nk_true;
        }
        win->property.select_start = 0;
        win->property.select_end = 0;
        win->property.active = 0;
    }
}

NK_API void
nk_property_int(struct nk_context *ctx, const char *name,
    int min, int *val, int max, int step, float inc_per_pixel)
{
    struct nk_property_variant variant;
    NK_ASSERT(ctx);
    NK_ASSERT(name);
    NK_ASSERT(val);

    if (!ctx || !ctx->current || !name || !val) return;
    variant = nk_property_variant_int(*val, min, max, step);
    nk_property(ctx, name, &variant, inc_per_pixel, NK_FILTER_INT);
    *val = variant.value.i;
}

NK_API void
nk_property_float(struct nk_context *ctx, const char *name,
    float min, float *val, float max, float step, float inc_per_pixel)
{
    struct nk_property_variant variant;
    NK_ASSERT(ctx);
    NK_ASSERT(name);
    NK_ASSERT(val);

    if (!ctx || !ctx->current || !name || !val) return;
    variant = nk_property_variant_float(*val, min, max, step);
    nk_property(ctx, name, &variant, inc_per_pixel, NK_FILTER_FLOAT);
    *val = variant.value.f;
}

NK_API void
nk_property_double(struct nk_context *ctx, const char *name,
    double min, double *val, double max, double step, float inc_per_pixel)
{
    struct nk_property_variant variant;
    NK_ASSERT(ctx);
    NK_ASSERT(name);
    NK_ASSERT(val);

    if (!ctx || !ctx->current || !name || !val) return;
    variant = nk_property_variant_double(*val, min, max, step);
    nk_property(ctx, name, &variant, inc_per_pixel, NK_FILTER_FLOAT);
    *val = variant.value.d;
}

NK_API int
nk_propertyi(struct nk_context *ctx, const char *name, int min, int val,
    int max, int step, float inc_per_pixel)
{
    struct nk_property_variant variant;
    NK_ASSERT(ctx);
    NK_ASSERT(name);

    if (!ctx || !ctx->current || !name) return val;
    variant = nk_property_variant_int(val, min, max, step);
    nk_property(ctx, name, &variant, inc_per_pixel, NK_FILTER_INT);
    val = variant.value.i;
    return val;
}

NK_API float
nk_propertyf(struct nk_context *ctx, const char *name, float min,
    float val, float max, float step, float inc_per_pixel)
{
    struct nk_property_variant variant;
    NK_ASSERT(ctx);
    NK_ASSERT(name);

    if (!ctx || !ctx->current || !name) return val;
    variant = nk_property_variant_float(val, min, max, step);
    nk_property(ctx, name, &variant, inc_per_pixel, NK_FILTER_FLOAT);
    val = variant.value.f;
    return val;
}

NK_API double
nk_propertyd(struct nk_context *ctx, const char *name, double min,
    double val, double max, double step, float inc_per_pixel)
{
    struct nk_property_variant variant;
    NK_ASSERT(ctx);
    NK_ASSERT(name);

    if (!ctx || !ctx->current || !name) return val;
    variant = nk_property_variant_double(val, min, max, step);
    nk_property(ctx, name, &variant, inc_per_pixel, NK_FILTER_FLOAT);
    val = variant.value.d;
    return val;
}

/*----------------------------------------------------------------
 *
 *                          COLOR PICKER
 *
 * --------------------------------------------------------------*/
NK_API int
nk_color_pick(struct nk_context * ctx, struct nk_color *color,
    enum nk_color_format fmt)
{
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_style *config;
    const struct nk_input *in;

    enum nk_widget_layout_states state;
    struct nk_rect bounds;

    NK_ASSERT(ctx);
    NK_ASSERT(color);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout || !color)
        return 0;

    win = ctx->current;
    config = &ctx->style;
    layout = win->layout;
    state = nk_widget(&bounds, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    return nk_do_color_picker(&ctx->last_widget_state, &win->buffer, color, fmt, bounds,
                nk_vec2(0,0), in, config->font);
}

NK_API struct nk_color
nk_color_picker(struct nk_context *ctx, struct nk_color color,
    enum nk_color_format fmt)
{
    nk_color_pick(ctx, &color, fmt);
    return color;
}

/* -------------------------------------------------------------
 *
 *                          CHART
 *
 * --------------------------------------------------------------*/
NK_API int
nk_chart_begin_colored(struct nk_context *ctx, enum nk_chart_type type,
    struct nk_color color, struct nk_color highlight,
    int count, float min_value, float max_value)
{
    struct nk_window *win;
    struct nk_chart *chart;
    const struct nk_style *config;
    const struct nk_style_chart *style;

    const struct nk_style_item *background;
    struct nk_rect bounds = {0, 0, 0, 0};

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);

    if (!ctx || !ctx->current || !ctx->current->layout) return 0;
    if (!nk_widget(&bounds, ctx)) {
        chart = &ctx->current->layout->chart;
        nk_zero(chart, sizeof(*chart));
        return 0;
    }

    win = ctx->current;
    config = &ctx->style;
    chart = &win->layout->chart;
    style = &config->chart;

    /* setup basic generic chart  */
    nk_zero(chart, sizeof(*chart));
    chart->x = bounds.x + style->padding.x;
    chart->y = bounds.y + style->padding.y;
    chart->w = bounds.w - 2 * style->padding.x;
    chart->h = bounds.h - 2 * style->padding.y;
    chart->w = NK_MAX(chart->w, 2 * style->padding.x);
    chart->h = NK_MAX(chart->h, 2 * style->padding.y);

    /* add first slot into chart */
    {struct nk_chart_slot *slot = &chart->slots[chart->slot++];
    slot->type = type;
    slot->count = count;
    slot->color = color;
    slot->highlight = highlight;
    slot->min = NK_MIN(min_value, max_value);
    slot->max = NK_MAX(min_value, max_value);
    slot->range = slot->max - slot->min;}

    /* draw chart background */
    background = &style->background;
    if (background->type == NK_STYLE_ITEM_IMAGE) {
        nk_draw_image(&win->buffer, bounds, &background->data.image, nk_white);
    } else {
        nk_fill_rect(&win->buffer, bounds, style->rounding, style->border_color);
        nk_fill_rect(&win->buffer, nk_shrink_rect(bounds, style->border),
            style->rounding, style->background.data.color);
    }
    return 1;
}

NK_API int
nk_chart_begin(struct nk_context *ctx, const enum nk_chart_type type,
    int count, float min_value, float max_value)
{return nk_chart_begin_colored(ctx, type, ctx->style.chart.color, ctx->style.chart.selected_color, count, min_value, max_value);}

NK_API void
nk_chart_add_slot_colored(struct nk_context *ctx, const enum nk_chart_type type,
    struct nk_color color, struct nk_color highlight,
    int count, float min_value, float max_value)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    NK_ASSERT(ctx->current->layout->chart.slot < NK_CHART_MAX_SLOT);
    if (!ctx || !ctx->current || !ctx->current->layout) return;
    if (ctx->current->layout->chart.slot >= NK_CHART_MAX_SLOT) return;

    /* add another slot into the graph */
    {struct nk_chart *chart = &ctx->current->layout->chart;
    struct nk_chart_slot *slot = &chart->slots[chart->slot++];
    slot->type = type;
    slot->count = count;
    slot->color = color;
    slot->highlight = highlight;
    slot->min = NK_MIN(min_value, max_value);
    slot->max = NK_MAX(min_value, max_value);
    slot->range = slot->max - slot->min;}
}

NK_API void
nk_chart_add_slot(struct nk_context *ctx, const enum nk_chart_type type,
    int count, float min_value, float max_value)
{nk_chart_add_slot_colored(ctx, type, ctx->style.chart.color, ctx->style.chart.selected_color, count, min_value, max_value);}

NK_INTERN nk_flags
nk_chart_push_line(struct nk_context *ctx, struct nk_window *win,
    struct nk_chart *g, float value, int slot)
{
    struct nk_panel *layout = win->layout;
    const struct nk_input *i = &ctx->input;
    struct nk_command_buffer *out = &win->buffer;

    nk_flags ret = 0;
    struct nk_vec2 cur;
    struct nk_rect bounds;
    struct nk_color color;
    float step;
    float range;
    float ratio;

    NK_ASSERT(slot >= 0 && slot < NK_CHART_MAX_SLOT);
    step = g->w / (float)g->slots[slot].count;
    range = g->slots[slot].max - g->slots[slot].min;
    ratio = (value - g->slots[slot].min) / range;

    if (g->slots[slot].index == 0) {
        /* first data point does not have a connection */
        g->slots[slot].last.x = g->x;
        g->slots[slot].last.y = (g->y + g->h) - ratio * (float)g->h;

        bounds.x = g->slots[slot].last.x - 2;
        bounds.y = g->slots[slot].last.y - 2;
        bounds.w = bounds.h = 4;

        color = g->slots[slot].color;
        if (!(layout->flags & NK_WINDOW_ROM) &&
            NK_INBOX(i->mouse.pos.x,i->mouse.pos.y, g->slots[slot].last.x-3, g->slots[slot].last.y-3, 6, 6)){
            ret = nk_input_is_mouse_hovering_rect(i, bounds) ? NK_CHART_HOVERING : 0;
            ret |= (i->mouse.buttons[NK_BUTTON_LEFT].down &&
                i->mouse.buttons[NK_BUTTON_LEFT].clicked) ? NK_CHART_CLICKED: 0;
            color = g->slots[slot].highlight;
        }
        nk_fill_rect(out, bounds, 0, color);
        g->slots[slot].index += 1;
        return ret;
    }

    /* draw a line between the last data point and the new one */
    color = g->slots[slot].color;
    cur.x = g->x + (float)(step * (float)g->slots[slot].index);
    cur.y = (g->y + g->h) - (ratio * (float)g->h);
    nk_stroke_line(out, g->slots[slot].last.x, g->slots[slot].last.y, cur.x, cur.y, 1.0f, color);

    bounds.x = cur.x - 3;
    bounds.y = cur.y - 3;
    bounds.w = bounds.h = 6;

    /* user selection of current data point */
    if (!(layout->flags & NK_WINDOW_ROM)) {
        if (nk_input_is_mouse_hovering_rect(i, bounds)) {
            ret = NK_CHART_HOVERING;
            ret |= (!i->mouse.buttons[NK_BUTTON_LEFT].down &&
                i->mouse.buttons[NK_BUTTON_LEFT].clicked) ? NK_CHART_CLICKED: 0;
            color = g->slots[slot].highlight;
        }
    }
    nk_fill_rect(out, nk_rect(cur.x - 2, cur.y - 2, 4, 4), 0, color);

    /* save current data point position */
    g->slots[slot].last.x = cur.x;
    g->slots[slot].last.y = cur.y;
    g->slots[slot].index  += 1;
    return ret;
}

NK_INTERN nk_flags
nk_chart_push_column(const struct nk_context *ctx, struct nk_window *win,
    struct nk_chart *chart, float value, int slot)
{
    struct nk_command_buffer *out = &win->buffer;
    const struct nk_input *in = &ctx->input;
    struct nk_panel *layout = win->layout;

    float ratio;
    nk_flags ret = 0;
    struct nk_color color;
    struct nk_rect item = {0,0,0,0};

    NK_ASSERT(slot >= 0 && slot < NK_CHART_MAX_SLOT);
    if (chart->slots[slot].index  >= chart->slots[slot].count)
        return nk_false;
    if (chart->slots[slot].count) {
        float padding = (float)(chart->slots[slot].count-1);
        item.w = (chart->w - padding) / (float)(chart->slots[slot].count);
    }

    /* calculate bounds of current bar chart entry */
    color = chart->slots[slot].color;;
    item.h = chart->h * NK_ABS((value/chart->slots[slot].range));
    if (value >= 0) {
        ratio = (value + NK_ABS(chart->slots[slot].min)) / NK_ABS(chart->slots[slot].range);
        item.y = (chart->y + chart->h) - chart->h * ratio;
    } else {
        ratio = (value - chart->slots[slot].max) / chart->slots[slot].range;
        item.y = chart->y + (chart->h * NK_ABS(ratio)) - item.h;
    }
    item.x = chart->x + ((float)chart->slots[slot].index * item.w);
    item.x = item.x + ((float)chart->slots[slot].index);

    /* user chart bar selection */
    if (!(layout->flags & NK_WINDOW_ROM) &&
        NK_INBOX(in->mouse.pos.x,in->mouse.pos.y,item.x,item.y,item.w,item.h)) {
        ret = NK_CHART_HOVERING;
        ret |= (!in->mouse.buttons[NK_BUTTON_LEFT].down &&
                in->mouse.buttons[NK_BUTTON_LEFT].clicked) ? NK_CHART_CLICKED: 0;
        color = chart->slots[slot].highlight;
    }
    nk_fill_rect(out, item, 0, color);
    chart->slots[slot].index += 1;
    return ret;
}

NK_API nk_flags
nk_chart_push_slot(struct nk_context *ctx, float value, int slot)
{
    nk_flags flags;
    struct nk_window *win;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(slot >= 0 && slot < NK_CHART_MAX_SLOT);
    NK_ASSERT(slot < ctx->current->layout->chart.slot);
    if (!ctx || !ctx->current || slot >= NK_CHART_MAX_SLOT) return nk_false;
    if (slot >= ctx->current->layout->chart.slot) return nk_false;

    win = ctx->current;
    if (win->layout->chart.slot < slot) return nk_false;
    switch (win->layout->chart.slots[slot].type) {
    case NK_CHART_LINES:
        flags = nk_chart_push_line(ctx, win, &win->layout->chart, value, slot); break;
    case NK_CHART_COLUMN:
        flags = nk_chart_push_column(ctx, win, &win->layout->chart, value, slot); break;
    default:
    case NK_CHART_MAX:
        flags = 0;
    }
    return flags;
}

NK_API nk_flags
nk_chart_push(struct nk_context *ctx, float value)
{return nk_chart_push_slot(ctx, value, 0);}

NK_API void
nk_chart_end(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_chart *chart;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current)
        return;

    win = ctx->current;
    chart = &win->layout->chart;
    NK_MEMSET(chart, 0, sizeof(*chart));
    return;
}

NK_API void
nk_plot(struct nk_context *ctx, enum nk_chart_type type, const float *values,
    int count, int offset)
{
    int i = 0;
    float min_value;
    float max_value;

    NK_ASSERT(ctx);
    NK_ASSERT(values);
    if (!ctx || !values || !count) return;

    min_value = values[offset];
    max_value = values[offset];
    for (i = 0; i < count; ++i) {
        min_value = NK_MIN(values[i + offset], min_value);
        max_value = NK_MAX(values[i + offset], max_value);
    }

    if (nk_chart_begin(ctx, type, count, min_value, max_value)) {
        for (i = 0; i < count; ++i)
            nk_chart_push(ctx, values[i + offset]);
        nk_chart_end(ctx);
    }
}

NK_API void
nk_plot_function(struct nk_context *ctx, enum nk_chart_type type, void *userdata,
    float(*value_getter)(void* user, int index), int count, int offset)
{
    int i = 0;
    float min_value;
    float max_value;

    NK_ASSERT(ctx);
    NK_ASSERT(value_getter);
    if (!ctx || !value_getter || !count) return;

    max_value = min_value = value_getter(userdata, offset);
    for (i = 0; i < count; ++i) {
        float value = value_getter(userdata, i + offset);
        min_value = NK_MIN(value, min_value);
        max_value = NK_MAX(value, max_value);
    }

    if (nk_chart_begin(ctx, type, count, min_value, max_value)) {
        for (i = 0; i < count; ++i)
            nk_chart_push(ctx, value_getter(userdata, i + offset));
        nk_chart_end(ctx);
    }
}

/* -------------------------------------------------------------
 *
 *                          GROUP
 *
 * --------------------------------------------------------------*/
NK_API int
nk_group_scrolled_offset_begin(struct nk_context *ctx,
    nk_uint *x_offset, nk_uint *y_offset, const char *title, nk_flags flags)
{
    struct nk_rect bounds;
    struct nk_window panel;
    struct nk_window *win;

    win = ctx->current;
    nk_panel_alloc_space(&bounds, ctx);
    {const struct nk_rect *c = &win->layout->clip;
    if (!NK_INTERSECT(c->x, c->y, c->w, c->h, bounds.x, bounds.y, bounds.w, bounds.h) &&
        !(flags & NK_WINDOW_MOVABLE)) {
        return 0;
    }}
    if (win->flags & NK_WINDOW_ROM)
        flags |= NK_WINDOW_ROM;

    /* initialize a fake window to create the panel from */
    nk_zero(&panel, sizeof(panel));
    panel.bounds = bounds;
    panel.flags = flags;
    panel.scrollbar.x = *x_offset;
    panel.scrollbar.y = *y_offset;
    panel.buffer = win->buffer;
    panel.layout = (struct nk_panel*)nk_create_panel(ctx);
    ctx->current = &panel;
    nk_panel_begin(ctx, (flags & NK_WINDOW_TITLE) ? title: 0, NK_PANEL_GROUP);

    win->buffer = panel.buffer;
    win->buffer.clip = panel.layout->clip;
    panel.layout->offset_x = x_offset;
    panel.layout->offset_y = y_offset;
    panel.layout->parent = win->layout;
    win->layout = panel.layout;

    ctx->current = win;
    if ((panel.layout->flags & NK_WINDOW_CLOSED) ||
        (panel.layout->flags & NK_WINDOW_MINIMIZED))
    {
        nk_flags f = panel.layout->flags;
        nk_group_scrolled_end(ctx);
        if (f & NK_WINDOW_CLOSED)
            return NK_WINDOW_CLOSED;
        if (f & NK_WINDOW_MINIMIZED)
            return NK_WINDOW_MINIMIZED;
    }
    return 1;
}

NK_API void
nk_group_scrolled_end(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_panel *parent;
    struct nk_panel *g;

    struct nk_rect clip;
    struct nk_window pan;
    struct nk_vec2 panel_padding;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current)
        return;

    /* make sure nk_group_begin was called correctly */
    NK_ASSERT(ctx->current);
    win = ctx->current;
    NK_ASSERT(win->layout);
    g = win->layout;
    NK_ASSERT(g->parent);
    parent = g->parent;

    /* dummy window */
    nk_zero_struct(pan);
    panel_padding = nk_panel_get_padding(&ctx->style, NK_PANEL_GROUP);
    pan.bounds.y = g->bounds.y - (g->header_height + g->menu.h);
    pan.bounds.x = g->bounds.x - panel_padding.x;
    pan.bounds.w = g->bounds.w + 2 * panel_padding.x;
    pan.bounds.h = g->bounds.h + g->header_height + g->menu.h;
    if (g->flags & NK_WINDOW_BORDER) {
        pan.bounds.x -= g->border;
        pan.bounds.y -= g->border;
        pan.bounds.w += 2*g->border;
        pan.bounds.h += 2*g->border;
    }
    if (!(g->flags & NK_WINDOW_NO_SCROLLBAR)) {
        pan.bounds.w += ctx->style.window.scrollbar_size.x;
        pan.bounds.h += ctx->style.window.scrollbar_size.y;
    }
    pan.scrollbar.x = *g->offset_x;
    pan.scrollbar.y = *g->offset_y;
    pan.flags = g->flags;
    pan.buffer = win->buffer;
    pan.layout = g;
    pan.parent = win;
    ctx->current = &pan;

    /* make sure group has correct clipping rectangle */
    nk_unify(&clip, &parent->clip, pan.bounds.x, pan.bounds.y,
        pan.bounds.x + pan.bounds.w, pan.bounds.y + pan.bounds.h + panel_padding.x);
    nk_push_scissor(&pan.buffer, clip);
    nk_end(ctx);

    win->buffer = pan.buffer;
    nk_push_scissor(&win->buffer, parent->clip);
    ctx->current = win;
    win->layout = parent;
    g->bounds = pan.bounds;
    return;
}

NK_API int
nk_group_scrolled_begin(struct nk_context *ctx,
    struct nk_scroll *scroll, const char *title, nk_flags flags)
{return nk_group_scrolled_offset_begin(ctx, &scroll->x, &scroll->y, title, flags);}

NK_API int
nk_group_begin(struct nk_context *ctx, const char *title, nk_flags flags)
{
    int title_len;
    nk_hash title_hash;
    struct nk_window *win;
    nk_uint *x_offset;
    nk_uint *y_offset;

    NK_ASSERT(ctx);
    NK_ASSERT(title);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout || !title)
        return 0;

    /* find persistent group scrollbar value */
    win = ctx->current;
    title_len = (int)nk_strlen(title);
    title_hash = nk_murmur_hash(title, (int)title_len, NK_PANEL_GROUP);
    x_offset = nk_find_value(win, title_hash);
    if (!x_offset) {
        x_offset = nk_add_value(ctx, win, title_hash, 0);
        y_offset = nk_add_value(ctx, win, title_hash+1, 0);

        NK_ASSERT(x_offset);
        NK_ASSERT(y_offset);
        if (!x_offset || !y_offset) return 0;
        *x_offset = *y_offset = 0;
    } else y_offset = nk_find_value(win, title_hash+1);
    return nk_group_scrolled_offset_begin(ctx, x_offset, y_offset, title, flags);
}

NK_API void
nk_group_end(struct nk_context *ctx)
{nk_group_scrolled_end(ctx);}

NK_API int
nk_list_view_begin(struct nk_context *ctx, struct nk_list_view *view,
    const char *title, nk_flags flags, int row_height, int row_count)
{
    int title_len;
    nk_hash title_hash;
    nk_uint *x_offset;
    nk_uint *y_offset;

    int result;
    struct nk_window *win;
    struct nk_panel *layout;
    const struct nk_style *style;
    struct nk_vec2 item_spacing;

    NK_ASSERT(ctx);
    NK_ASSERT(view);
    NK_ASSERT(title);
    if (!ctx || !view || !title) return 0;

    win = ctx->current;
    style = &ctx->style;
    item_spacing = style->window.spacing;
    row_height += NK_MAX(0, (int)item_spacing.y);

    /* find persistent list view scrollbar offset */
    title_len = (int)nk_strlen(title);
    title_hash = nk_murmur_hash(title, (int)title_len, NK_PANEL_GROUP);
    x_offset = nk_find_value(win, title_hash);
    if (!x_offset) {
        x_offset = nk_add_value(ctx, win, title_hash, 0);
        y_offset = nk_add_value(ctx, win, title_hash+1, 0);

        NK_ASSERT(x_offset);
        NK_ASSERT(y_offset);
        if (!x_offset || !y_offset) return 0;
        *x_offset = *y_offset = 0;
    } else y_offset = nk_find_value(win, title_hash+1);
    view->scroll_value = *y_offset;
    view->scroll_pointer = y_offset;

    *y_offset = 0;
    result = nk_group_scrolled_offset_begin(ctx, x_offset, y_offset, title, flags);
    win = ctx->current;
    layout = win->layout;

    view->total_height = row_height * NK_MAX(row_count,1);
    view->begin = (int)NK_MAX(((float)view->scroll_value / (float)row_height), 0.0f);
    view->count = (int)NK_MAX(nk_iceilf((layout->clip.h)/(float)row_height), 0);
    view->end = view->begin + view->count;
    view->ctx = ctx;
    return result;
}

NK_API void
nk_list_view_end(struct nk_list_view *view)
{
    struct nk_context *ctx;
    struct nk_window *win;
    struct nk_panel *layout;

    NK_ASSERT(view);
    NK_ASSERT(view->ctx);
    NK_ASSERT(view->scroll_pointer);
    if (!view || !view->ctx) return;

    ctx = view->ctx;
    win = ctx->current;
    layout = win->layout;
    layout->at_y = layout->bounds.y + (float)view->total_height;
    *view->scroll_pointer = *view->scroll_pointer + view->scroll_value;
    nk_group_end(view->ctx);
}

/* --------------------------------------------------------------
 *
 *                          POPUP
 *
 * --------------------------------------------------------------*/
NK_API int
nk_popup_begin(struct nk_context *ctx, enum nk_popup_type type,
    const char *title, nk_flags flags, struct nk_rect rect)
{
    struct nk_window *popup;
    struct nk_window *win;
    struct nk_panel *panel;

    int title_len;
    nk_hash title_hash;
    nk_size allocated;

    NK_ASSERT(ctx);
    NK_ASSERT(title);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    panel = win->layout;
    NK_ASSERT(!(panel->type & NK_PANEL_SET_POPUP) && "popups are not allowed to have popups");
    (void)panel;
    title_len = (int)nk_strlen(title);
    title_hash = nk_murmur_hash(title, (int)title_len, NK_PANEL_POPUP);

    popup = win->popup.win;
    if (!popup) {
        popup = (struct nk_window*)nk_create_window(ctx);
        popup->parent = win;
        win->popup.win = popup;
        win->popup.active = 0;
        win->popup.type = NK_PANEL_POPUP;
    }

    /* make sure we have correct popup */
    if (win->popup.name != title_hash) {
        if (!win->popup.active) {
            nk_zero(popup, sizeof(*popup));
            win->popup.name = title_hash;
            win->popup.active = 1;
            win->popup.type = NK_PANEL_POPUP;
        } else return 0;
    }

    /* popup position is local to window */
    ctx->current = popup;
    rect.x += win->layout->clip.x;
    rect.y += win->layout->clip.y;

    /* setup popup data */
    popup->parent = win;
    popup->bounds = rect;
    popup->seq = ctx->seq;
    popup->layout = (struct nk_panel*)nk_create_panel(ctx);
    popup->flags = flags;
    popup->flags |= NK_WINDOW_BORDER;
    if (type == NK_POPUP_DYNAMIC)
        popup->flags |= NK_WINDOW_DYNAMIC;

    popup->buffer = win->buffer;
    nk_start_popup(ctx, win);
    allocated = ctx->memory.allocated;
    nk_push_scissor(&popup->buffer, nk_null_rect);

    if (nk_panel_begin(ctx, title, NK_PANEL_POPUP)) {
        /* popup is running therefore invalidate parent panels */
        struct nk_panel *root;
        root = win->layout;
        while (root) {
            root->flags |= NK_WINDOW_ROM;
            root->flags &= ~(nk_flags)NK_WINDOW_REMOVE_ROM;
            root = root->parent;
        }
        win->popup.active = 1;
        popup->layout->offset_x = &popup->scrollbar.x;
        popup->layout->offset_y = &popup->scrollbar.y;
        popup->layout->parent = win->layout;
        return 1;
    } else {
        /* popup was closed/is invalid so cleanup */
        struct nk_panel *root;
        root = win->layout;
        while (root) {
            root->flags |= NK_WINDOW_REMOVE_ROM;
            root = root->parent;
        }
        win->popup.buf.active = 0;
        win->popup.active = 0;
        ctx->memory.allocated = allocated;
        ctx->current = win;
        nk_free_panel(ctx, popup->layout);
        popup->layout = 0;
        return 0;
    }
}

NK_INTERN int
nk_nonblock_begin(struct nk_context *ctx,
    nk_flags flags, struct nk_rect body, struct nk_rect header,
    enum nk_panel_type panel_type)
{
    struct nk_window *popup;
    struct nk_window *win;
    struct nk_panel *panel;
    int is_active = nk_true;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    /* popups cannot have popups */
    win = ctx->current;
    panel = win->layout;
    NK_ASSERT(!(panel->type & NK_PANEL_SET_POPUP));
    (void)panel;
    popup = win->popup.win;
    if (!popup) {
        /* create window for nonblocking popup */
        popup = (struct nk_window*)nk_create_window(ctx);
        popup->parent = win;
        win->popup.win = popup;
        win->popup.type = panel_type;
        nk_command_buffer_init(&popup->buffer, &ctx->memory, NK_CLIPPING_ON);
    } else {
        /* close the popup if user pressed outside or in the header */
        int pressed, in_body, in_header;
        pressed = nk_input_is_mouse_pressed(&ctx->input, NK_BUTTON_LEFT);
        in_body = nk_input_is_mouse_hovering_rect(&ctx->input, body);
        in_header = nk_input_is_mouse_hovering_rect(&ctx->input, header);
        if (pressed && (!in_body || in_header))
            is_active = nk_false;
    }
    win->popup.header = header;

    if (!is_active) {
        /* remove read only mode from all parent panels */
        struct nk_panel *root = win->layout;
        while (root) {
            root->flags |= NK_WINDOW_REMOVE_ROM;
            root = root->parent;
        }
        return is_active;
    }

    popup->bounds = body;
    popup->parent = win;
    popup->layout = (struct nk_panel*)nk_create_panel(ctx);
    popup->flags = flags;
    popup->flags |= NK_WINDOW_BORDER;
    popup->flags |= NK_WINDOW_DYNAMIC;
    popup->seq = ctx->seq;
    win->popup.active = 1;
    NK_ASSERT(popup->layout);

    nk_start_popup(ctx, win);
    popup->buffer = win->buffer;
    nk_push_scissor(&popup->buffer, nk_null_rect);
    ctx->current = popup;

    nk_panel_begin(ctx, 0, panel_type);
    win->buffer = popup->buffer;
    popup->layout->parent = win->layout;
    popup->layout->offset_x = &popup->scrollbar.x;
    popup->layout->offset_y = &popup->scrollbar.y;

    /* set read only mode to all parent panels */
    {struct nk_panel *root;
    root = win->layout;
    while (root) {
        root->flags |= NK_WINDOW_ROM;
        root = root->parent;
    }}
    return is_active;
}

NK_API void
nk_popup_close(struct nk_context *ctx)
{
    struct nk_window *popup;
    NK_ASSERT(ctx);
    if (!ctx || !ctx->current) return;

    popup = ctx->current;
    NK_ASSERT(popup->parent);
    NK_ASSERT(popup->layout->type & NK_PANEL_SET_POPUP);
    popup->flags |= NK_WINDOW_HIDDEN;
}

NK_API void
nk_popup_end(struct nk_context *ctx)
{
    struct nk_window *win;
    struct nk_window *popup;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return;

    popup = ctx->current;
    if (!popup->parent) return;
    win = popup->parent;
    if (popup->flags & NK_WINDOW_HIDDEN) {
        struct nk_panel *root;
        root = win->layout;
        while (root) {
            root->flags |= NK_WINDOW_REMOVE_ROM;
            root = root->parent;
        }
        win->popup.active = 0;
    }
    nk_push_scissor(&popup->buffer, nk_null_rect);
    nk_end(ctx);

    win->buffer = popup->buffer;
    nk_finish_popup(ctx, win);
    ctx->current = win;
    nk_push_scissor(&win->buffer, win->layout->clip);
}
/* -------------------------------------------------------------
 *
 *                          TOOLTIP
 *
 * -------------------------------------------------------------- */
NK_API int
nk_tooltip_begin(struct nk_context *ctx, float width)
{
    struct nk_window *win;
    const struct nk_input *in;
    struct nk_rect bounds;
    int ret;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    /* make sure that no nonblocking popup is currently active */
    win = ctx->current;
    in = &ctx->input;
    if (win->popup.win && (win->popup.type & NK_PANEL_SET_NONBLOCK))
        return 0;

    bounds.w = width;
    bounds.h = nk_null_rect.h;
    bounds.x = (in->mouse.pos.x + 1) - win->layout->clip.x;
    bounds.y = (in->mouse.pos.y + 1) - win->layout->clip.y;

    ret = nk_popup_begin(ctx, NK_POPUP_DYNAMIC,
        "__##Tooltip##__", NK_WINDOW_NO_SCROLLBAR|NK_WINDOW_BORDER, bounds);
    if (ret) win->layout->flags &= ~(nk_flags)NK_WINDOW_ROM;
    win->popup.type = NK_PANEL_TOOLTIP;
    ctx->current->layout->type = NK_PANEL_TOOLTIP;
    return ret;
}

NK_API void
nk_tooltip_end(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return;
    ctx->current->seq--;
    nk_popup_close(ctx);
    nk_popup_end(ctx);
}

NK_API void
nk_tooltip(struct nk_context *ctx, const char *text)
{
    const struct nk_style *style;
    struct nk_vec2 padding;

    int text_len;
    float text_width;
    float text_height;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    NK_ASSERT(text);
    if (!ctx || !ctx->current || !ctx->current->layout || !text)
        return;

    /* fetch configuration data */
    style = &ctx->style;
    padding = style->window.padding;

    /* calculate size of the text and tooltip */
    text_len = nk_strlen(text);
    text_width = style->font->width(style->font->userdata,
                    style->font->height, text, text_len);
    text_width += (4 * padding.x);
    text_height = (style->font->height + 2 * padding.y);

    /* execute tooltip and fill with text */
    if (nk_tooltip_begin(ctx, (float)text_width)) {
        nk_layout_row_dynamic(ctx, (float)text_height, 1);
        nk_text(ctx, text, text_len, NK_TEXT_LEFT);
        nk_tooltip_end(ctx);
    }
}
/* -------------------------------------------------------------
 *
 *                          CONTEXTUAL
 *
 * -------------------------------------------------------------- */
NK_API int
nk_contextual_begin(struct nk_context *ctx, nk_flags flags, struct nk_vec2 size,
    struct nk_rect trigger_bounds)
{
    struct nk_window *win;
    struct nk_window *popup;
    struct nk_rect body;

    NK_STORAGE const struct nk_rect null_rect = {0,0,0,0};
    int is_clicked = 0;
    int is_active = 0;
    int is_open = 0;
    int ret = 0;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    ++win->popup.con_count;

    /* check if currently active contextual is active */
    popup = win->popup.win;
    is_open = (popup && win->popup.type == NK_PANEL_CONTEXTUAL);
    is_clicked = nk_input_mouse_clicked(&ctx->input, NK_BUTTON_RIGHT, trigger_bounds);
    if (win->popup.active_con && win->popup.con_count != win->popup.active_con)
        return 0;
    if ((is_clicked && is_open && !is_active) || (!is_open && !is_active && !is_clicked))
        return 0;

    /* calculate contextual position on click */
    win->popup.active_con = win->popup.con_count;
    if (is_clicked) {
        body.x = ctx->input.mouse.pos.x;
        body.y = ctx->input.mouse.pos.y;
    } else {
        body.x = popup->bounds.x;
        body.y = popup->bounds.y;
    }
    body.w = size.x;
    body.h = size.y;

    /* start nonblocking contextual popup */
    ret = nk_nonblock_begin(ctx, flags|NK_WINDOW_NO_SCROLLBAR, body,
            null_rect, NK_PANEL_CONTEXTUAL);
    if (ret) win->popup.type = NK_PANEL_CONTEXTUAL;
    else {
        win->popup.active_con = 0;
        if (win->popup.win)
            win->popup.win->flags = 0;
    }
    return ret;
}

NK_API int
nk_contextual_item_text(struct nk_context *ctx, const char *text, int len,
    nk_flags alignment)
{
    struct nk_window *win;
    const struct nk_input *in;
    const struct nk_style *style;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    state = nk_widget_fitting(&bounds, ctx, style->contextual_button.padding);
    if (!state) return nk_false;

    in = (state == NK_WIDGET_ROM || win->layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    if (nk_do_button_text(&ctx->last_widget_state, &win->buffer, bounds,
        text, len, alignment, NK_BUTTON_DEFAULT, &style->contextual_button, in, style->font)) {
        nk_contextual_close(ctx);
        return nk_true;
    }
    return nk_false;
}

NK_API int nk_contextual_item_label(struct nk_context *ctx, const char *label, nk_flags align)
{return nk_contextual_item_text(ctx, label, nk_strlen(label), align);}

NK_API int
nk_contextual_item_image_text(struct nk_context *ctx, struct nk_image img,
    const char *text, int len, nk_flags align)
{
    struct nk_window *win;
    const struct nk_input *in;
    const struct nk_style *style;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    state = nk_widget_fitting(&bounds, ctx, style->contextual_button.padding);
    if (!state) return nk_false;

    in = (state == NK_WIDGET_ROM || win->layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    if (nk_do_button_text_image(&ctx->last_widget_state, &win->buffer, bounds,
        img, text, len, align, NK_BUTTON_DEFAULT, &style->contextual_button, style->font, in)){
        nk_contextual_close(ctx);
        return nk_true;
    }
    return nk_false;
}

NK_API int nk_contextual_item_image_label(struct nk_context *ctx, struct nk_image img,
    const char *label, nk_flags align)
{return nk_contextual_item_image_text(ctx, img, label, nk_strlen(label), align);}

NK_API int
nk_contextual_item_symbol_text(struct nk_context *ctx, enum nk_symbol_type symbol,
    const char *text, int len, nk_flags align)
{
    struct nk_window *win;
    const struct nk_input *in;
    const struct nk_style *style;

    struct nk_rect bounds;
    enum nk_widget_layout_states state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    state = nk_widget_fitting(&bounds, ctx, style->contextual_button.padding);
    if (!state) return nk_false;

    in = (state == NK_WIDGET_ROM || win->layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    if (nk_do_button_text_symbol(&ctx->last_widget_state, &win->buffer, bounds,
        symbol, text, len, align, NK_BUTTON_DEFAULT, &style->contextual_button, style->font, in)) {
        nk_contextual_close(ctx);
        return nk_true;
    }
    return nk_false;
}

NK_API int nk_contextual_item_symbol_label(struct nk_context *ctx, enum nk_symbol_type symbol,
    const char *text, nk_flags align)
{return nk_contextual_item_symbol_text(ctx, symbol, text, nk_strlen(text), align);}

NK_API void
nk_contextual_close(struct nk_context *ctx)
{
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout) return;
    nk_popup_close(ctx);
}

NK_API void
nk_contextual_end(struct nk_context *ctx)
{
    struct nk_window *popup;
    struct nk_panel *panel;
    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    if (!ctx || !ctx->current) return;

    popup = ctx->current;
    panel = popup->layout;
    NK_ASSERT(popup->parent);
    NK_ASSERT(panel->type & NK_PANEL_SET_POPUP);
    if (panel->flags & NK_WINDOW_DYNAMIC) {
        /* Close behavior
        This is a bit of a hack solution since we do not know before we end our popup
        how big it will be. We therefore do not directly know when a
        click outside the non-blocking popup must close it at that direct frame.
        Instead it will be closed in the next frame.*/
        struct nk_rect body = {0,0,0,0};
        if (panel->at_y < (panel->bounds.y + panel->bounds.h)) {
            struct nk_vec2 padding = nk_panel_get_padding(&ctx->style, panel->type);
            body = panel->bounds;
            body.y = (panel->at_y + panel->footer_height + panel->border + padding.y + panel->row.height);
            body.h = (panel->bounds.y + panel->bounds.h) - body.y;
        }
        {int pressed = nk_input_is_mouse_pressed(&ctx->input, NK_BUTTON_LEFT);
        int in_body = nk_input_is_mouse_hovering_rect(&ctx->input, body);
        if (pressed && in_body)
            popup->flags |= NK_WINDOW_HIDDEN;
        }
    }
    if (popup->flags & NK_WINDOW_HIDDEN)
        popup->seq = 0;
    nk_popup_end(ctx);
    return;
}
/* -------------------------------------------------------------
 *
 *                          COMBO
 *
 * --------------------------------------------------------------*/
NK_INTERN int
nk_combo_begin(struct nk_context *ctx, struct nk_window *win,
    struct nk_vec2 size, int is_clicked, struct nk_rect header)
{
    struct nk_window *popup;
    int is_open = 0;
    int is_active = 0;
    struct nk_rect body;
    nk_hash hash;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    popup = win->popup.win;
    body.x = header.x;
    body.w = size.x;
    body.y = header.y + header.h-ctx->style.window.combo_border;
    body.h = size.y;

    hash = win->popup.combo_count++;
    is_open = (popup) ? nk_true:nk_false;
    is_active = (popup && (win->popup.name == hash) && win->popup.type == NK_PANEL_COMBO);
    if ((is_clicked && is_open && !is_active) || (is_open && !is_active) ||
        (!is_open && !is_active && !is_clicked)) return 0;
    if (!nk_nonblock_begin(ctx, 0, body,
        (is_clicked && is_open)?nk_rect(0,0,0,0):header, NK_PANEL_COMBO)) return 0;

    win->popup.type = NK_PANEL_COMBO;
    win->popup.name = hash;
    return 1;
}

NK_API int
nk_combo_begin_text(struct nk_context *ctx, const char *selected, int len,
    struct nk_vec2 size)
{
    const struct nk_input *in;
    struct nk_window *win;
    struct nk_style *style;

    enum nk_widget_layout_states s;
    int is_clicked = nk_false;
    struct nk_rect header;
    const struct nk_style_item *background;
    struct nk_text text;

    NK_ASSERT(ctx);
    NK_ASSERT(selected);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout || !selected)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    s = nk_widget(&header, ctx);
    if (s == NK_WIDGET_INVALID)
        return 0;

    in = (win->layout->flags & NK_WINDOW_ROM || s == NK_WIDGET_ROM)? 0: &ctx->input;
    if (nk_button_behavior(&ctx->last_widget_state, header, in, NK_BUTTON_DEFAULT))
        is_clicked = nk_true;

    /* draw combo box header background and border */
    if (ctx->last_widget_state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->combo.active;
        text.text = style->combo.label_active;
    } else if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER) {
        background = &style->combo.hover;
        text.text = style->combo.label_hover;
    } else {
        background = &style->combo.normal;
        text.text = style->combo.label_normal;
    }
    if (background->type == NK_STYLE_ITEM_IMAGE) {
        text.background = nk_rgba(0,0,0,0);
        nk_draw_image(&win->buffer, header, &background->data.image, nk_white);
    } else {
        text.background = background->data.color;
        nk_fill_rect(&win->buffer, header, style->combo.rounding, background->data.color);
        nk_stroke_rect(&win->buffer, header, style->combo.rounding, style->combo.border, style->combo.border_color);
    }
    {
        /* print currently selected text item */
        struct nk_rect label;
        struct nk_rect button;
        struct nk_rect content;

        enum nk_symbol_type sym;
        if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
            sym = style->combo.sym_hover;
        else if (is_clicked)
            sym = style->combo.sym_active;
        else sym = style->combo.sym_normal;

        /* calculate button */
        button.w = header.h - 2 * style->combo.button_padding.y;
        button.x = (header.x + header.w - header.h) - style->combo.button_padding.x;
        button.y = header.y + style->combo.button_padding.y;
        button.h = button.w;

        content.x = button.x + style->combo.button.padding.x;
        content.y = button.y + style->combo.button.padding.y;
        content.w = button.w - 2 * style->combo.button.padding.x;
        content.h = button.h - 2 * style->combo.button.padding.y;

        /* draw selected label */
        text.padding = nk_vec2(0,0);
        label.x = header.x + style->combo.content_padding.x;
        label.y = header.y + style->combo.content_padding.y;
        label.w = button.x - (style->combo.content_padding.x + style->combo.spacing.x) - label.x;;
        label.h = header.h - 2 * style->combo.content_padding.y;
        nk_widget_text(&win->buffer, label, selected, len, &text,
            NK_TEXT_LEFT, ctx->style.font);

        /* draw open/close button */
        nk_draw_button_symbol(&win->buffer, &button, &content, ctx->last_widget_state,
            &ctx->style.combo.button, sym, style->font);
    }
    return nk_combo_begin(ctx, win, size, is_clicked, header);
}

NK_API int nk_combo_begin_label(struct nk_context *ctx, const char *selected, struct nk_vec2 size)
{return nk_combo_begin_text(ctx, selected, nk_strlen(selected), size);}

NK_API int
nk_combo_begin_color(struct nk_context *ctx, struct nk_color color, struct nk_vec2 size)
{
    struct nk_window *win;
    struct nk_style *style;
    const struct nk_input *in;

    struct nk_rect header;
    int is_clicked = nk_false;
    enum nk_widget_layout_states s;
    const struct nk_style_item *background;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    s = nk_widget(&header, ctx);
    if (s == NK_WIDGET_INVALID)
        return 0;

    in = (win->layout->flags & NK_WINDOW_ROM || s == NK_WIDGET_ROM)? 0: &ctx->input;
    if (nk_button_behavior(&ctx->last_widget_state, header, in, NK_BUTTON_DEFAULT))
        is_clicked = nk_true;

    /* draw combo box header background and border */
    if (ctx->last_widget_state & NK_WIDGET_STATE_ACTIVED)
        background = &style->combo.active;
    else if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
        background = &style->combo.hover;
    else background = &style->combo.normal;

    if (background->type == NK_STYLE_ITEM_IMAGE) {
        nk_draw_image(&win->buffer, header, &background->data.image,nk_white);
    } else {
        nk_fill_rect(&win->buffer, header, style->combo.rounding, background->data.color);
        nk_stroke_rect(&win->buffer, header, style->combo.rounding, style->combo.border, style->combo.border_color);
    }
    {
        struct nk_rect content;
        struct nk_rect button;
        struct nk_rect bounds;

        enum nk_symbol_type sym;
        if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
            sym = style->combo.sym_hover;
        else if (is_clicked)
            sym = style->combo.sym_active;
        else sym = style->combo.sym_normal;

        /* calculate button */
        button.w = header.h - 2 * style->combo.button_padding.y;
        button.x = (header.x + header.w - header.h) - style->combo.button_padding.x;
        button.y = header.y + style->combo.button_padding.y;
        button.h = button.w;

        content.x = button.x + style->combo.button.padding.x;
        content.y = button.y + style->combo.button.padding.y;
        content.w = button.w - 2 * style->combo.button.padding.x;
        content.h = button.h - 2 * style->combo.button.padding.y;

        /* draw color */
        bounds.h = header.h - 4 * style->combo.content_padding.y;
        bounds.y = header.y + 2 * style->combo.content_padding.y;
        bounds.x = header.x + 2 * style->combo.content_padding.x;
        bounds.w = (button.x - (style->combo.content_padding.x + style->combo.spacing.x)) - bounds.x;
        nk_fill_rect(&win->buffer, bounds, 0, color);

        /* draw open/close button */
        nk_draw_button_symbol(&win->buffer, &button, &content, ctx->last_widget_state,
            &ctx->style.combo.button, sym, style->font);
    }
    return nk_combo_begin(ctx, win, size, is_clicked, header);
}

NK_API int
nk_combo_begin_symbol(struct nk_context *ctx, enum nk_symbol_type symbol, struct nk_vec2 size)
{
    struct nk_window *win;
    struct nk_style *style;
    const struct nk_input *in;

    struct nk_rect header;
    int is_clicked = nk_false;
    enum nk_widget_layout_states s;
    const struct nk_style_item *background;
    struct nk_color sym_background;
    struct nk_color symbol_color;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    s = nk_widget(&header, ctx);
    if (s == NK_WIDGET_INVALID)
        return 0;

    in = (win->layout->flags & NK_WINDOW_ROM || s == NK_WIDGET_ROM)? 0: &ctx->input;
    if (nk_button_behavior(&ctx->last_widget_state, header, in, NK_BUTTON_DEFAULT))
        is_clicked = nk_true;

    /* draw combo box header background and border */
    if (ctx->last_widget_state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->combo.active;
        symbol_color = style->combo.symbol_active;
    } else if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER) {
        background = &style->combo.hover;
        symbol_color = style->combo.symbol_hover;
    } else {
        background = &style->combo.normal;
        symbol_color = style->combo.symbol_hover;
    }

    if (background->type == NK_STYLE_ITEM_IMAGE) {
        sym_background = nk_rgba(0,0,0,0);
        nk_draw_image(&win->buffer, header, &background->data.image, nk_white);
    } else {
        sym_background = background->data.color;
        nk_fill_rect(&win->buffer, header, style->combo.rounding, background->data.color);
        nk_stroke_rect(&win->buffer, header, style->combo.rounding, style->combo.border, style->combo.border_color);
    }
    {
        struct nk_rect bounds = {0,0,0,0};
        struct nk_rect content;
        struct nk_rect button;

        enum nk_symbol_type sym;
        if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
            sym = style->combo.sym_hover;
        else if (is_clicked)
            sym = style->combo.sym_active;
        else sym = style->combo.sym_normal;

        /* calculate button */
        button.w = header.h - 2 * style->combo.button_padding.y;
        button.x = (header.x + header.w - header.h) - style->combo.button_padding.y;
        button.y = header.y + style->combo.button_padding.y;
        button.h = button.w;

        content.x = button.x + style->combo.button.padding.x;
        content.y = button.y + style->combo.button.padding.y;
        content.w = button.w - 2 * style->combo.button.padding.x;
        content.h = button.h - 2 * style->combo.button.padding.y;

        /* draw symbol */
        bounds.h = header.h - 2 * style->combo.content_padding.y;
        bounds.y = header.y + style->combo.content_padding.y;
        bounds.x = header.x + style->combo.content_padding.x;
        bounds.w = (button.x - style->combo.content_padding.y) - bounds.x;
        nk_draw_symbol(&win->buffer, symbol, bounds, sym_background, symbol_color,
            1.0f, style->font);

        /* draw open/close button */
        nk_draw_button_symbol(&win->buffer, &bounds, &content, ctx->last_widget_state,
            &ctx->style.combo.button, sym, style->font);
    }
    return nk_combo_begin(ctx, win, size, is_clicked, header);
}

NK_API int
nk_combo_begin_symbol_text(struct nk_context *ctx, const char *selected, int len,
    enum nk_symbol_type symbol, struct nk_vec2 size)
{
    struct nk_window *win;
    struct nk_style *style;
    struct nk_input *in;

    struct nk_rect header;
    int is_clicked = nk_false;
    enum nk_widget_layout_states s;
    const struct nk_style_item *background;
    struct nk_color symbol_color;
    struct nk_text text;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    s = nk_widget(&header, ctx);
    if (!s) return 0;

    in = (win->layout->flags & NK_WINDOW_ROM || s == NK_WIDGET_ROM)? 0: &ctx->input;
    if (nk_button_behavior(&ctx->last_widget_state, header, in, NK_BUTTON_DEFAULT))
        is_clicked = nk_true;

    /* draw combo box header background and border */
    if (ctx->last_widget_state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->combo.active;
        symbol_color = style->combo.symbol_active;
        text.text = style->combo.label_active;
    } else if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER) {
        background = &style->combo.hover;
        symbol_color = style->combo.symbol_hover;
        text.text = style->combo.label_hover;
    } else {
        background = &style->combo.normal;
        symbol_color = style->combo.symbol_normal;
        text.text = style->combo.label_normal;
    }
    if (background->type == NK_STYLE_ITEM_IMAGE) {
        text.background = nk_rgba(0,0,0,0);
        nk_draw_image(&win->buffer, header, &background->data.image, nk_white);
    } else {
        text.background = background->data.color;
        nk_fill_rect(&win->buffer, header, style->combo.rounding, background->data.color);
        nk_stroke_rect(&win->buffer, header, style->combo.rounding, style->combo.border, style->combo.border_color);
    }
    {
        struct nk_rect content;
        struct nk_rect button;
        struct nk_rect label;
        struct nk_rect image;

        enum nk_symbol_type sym;
        if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
            sym = style->combo.sym_hover;
        else if (is_clicked)
            sym = style->combo.sym_active;
        else sym = style->combo.sym_normal;

        /* calculate button */
        button.w = header.h - 2 * style->combo.button_padding.y;
        button.x = (header.x + header.w - header.h) - style->combo.button_padding.x;
        button.y = header.y + style->combo.button_padding.y;
        button.h = button.w;

        content.x = button.x + style->combo.button.padding.x;
        content.y = button.y + style->combo.button.padding.y;
        content.w = button.w - 2 * style->combo.button.padding.x;
        content.h = button.h - 2 * style->combo.button.padding.y;
        nk_draw_button_symbol(&win->buffer, &button, &content, ctx->last_widget_state,
            &ctx->style.combo.button, sym, style->font);

        /* draw symbol */
        image.x = header.x + style->combo.content_padding.x;
        image.y = header.y + style->combo.content_padding.y;
        image.h = header.h - 2 * style->combo.content_padding.y;
        image.w = image.h;
        nk_draw_symbol(&win->buffer, symbol, image, text.background, symbol_color,
            1.0f, style->font);

        /* draw label */
        text.padding = nk_vec2(0,0);
        label.x = image.x + image.w + style->combo.spacing.x + style->combo.content_padding.x;
        label.y = header.y + style->combo.content_padding.y;
        label.w = (button.x - style->combo.content_padding.x) - label.x;
        label.h = header.h - 2 * style->combo.content_padding.y;
        nk_widget_text(&win->buffer, label, selected, len, &text, NK_TEXT_LEFT, style->font);
    }
    return nk_combo_begin(ctx, win, size, is_clicked, header);
}

NK_API int
nk_combo_begin_image(struct nk_context *ctx, struct nk_image img, struct nk_vec2 size)
{
    struct nk_window *win;
    struct nk_style *style;
    const struct nk_input *in;

    struct nk_rect header;
    int is_clicked = nk_false;
    enum nk_widget_layout_states s;
    const struct nk_style_item *background;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    s = nk_widget(&header, ctx);
    if (s == NK_WIDGET_INVALID)
        return 0;

    in = (win->layout->flags & NK_WINDOW_ROM || s == NK_WIDGET_ROM)? 0: &ctx->input;
    if (nk_button_behavior(&ctx->last_widget_state, header, in, NK_BUTTON_DEFAULT))
        is_clicked = nk_true;

    /* draw combo box header background and border */
    if (ctx->last_widget_state & NK_WIDGET_STATE_ACTIVED)
        background = &style->combo.active;
    else if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
        background = &style->combo.hover;
    else background = &style->combo.normal;

    if (background->type == NK_STYLE_ITEM_IMAGE) {
        nk_draw_image(&win->buffer, header, &background->data.image, nk_white);
    } else {
        nk_fill_rect(&win->buffer, header, style->combo.rounding, background->data.color);
        nk_stroke_rect(&win->buffer, header, style->combo.rounding, style->combo.border, style->combo.border_color);
    }
    {
        struct nk_rect bounds = {0,0,0,0};
        struct nk_rect content;
        struct nk_rect button;

        enum nk_symbol_type sym;
        if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
            sym = style->combo.sym_hover;
        else if (is_clicked)
            sym = style->combo.sym_active;
        else sym = style->combo.sym_normal;

        /* calculate button */
        button.w = header.h - 2 * style->combo.button_padding.y;
        button.x = (header.x + header.w - header.h) - style->combo.button_padding.y;
        button.y = header.y + style->combo.button_padding.y;
        button.h = button.w;

        content.x = button.x + style->combo.button.padding.x;
        content.y = button.y + style->combo.button.padding.y;
        content.w = button.w - 2 * style->combo.button.padding.x;
        content.h = button.h - 2 * style->combo.button.padding.y;

        /* draw image */
        bounds.h = header.h - 2 * style->combo.content_padding.y;
        bounds.y = header.y + style->combo.content_padding.y;
        bounds.x = header.x + style->combo.content_padding.x;
        bounds.w = (button.x - style->combo.content_padding.y) - bounds.x;
        nk_draw_image(&win->buffer, bounds, &img, nk_white);

        /* draw open/close button */
        nk_draw_button_symbol(&win->buffer, &bounds, &content, ctx->last_widget_state,
            &ctx->style.combo.button, sym, style->font);
    }
    return nk_combo_begin(ctx, win, size, is_clicked, header);
}

NK_API int
nk_combo_begin_image_text(struct nk_context *ctx, const char *selected, int len,
    struct nk_image img, struct nk_vec2 size)
{
    struct nk_window *win;
    struct nk_style *style;
    struct nk_input *in;

    struct nk_rect header;
    int is_clicked = nk_false;
    enum nk_widget_layout_states s;
    const struct nk_style_item *background;
    struct nk_text text;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    style = &ctx->style;
    s = nk_widget(&header, ctx);
    if (!s) return 0;

    in = (win->layout->flags & NK_WINDOW_ROM || s == NK_WIDGET_ROM)? 0: &ctx->input;
    if (nk_button_behavior(&ctx->last_widget_state, header, in, NK_BUTTON_DEFAULT))
        is_clicked = nk_true;

    /* draw combo box header background and border */
    if (ctx->last_widget_state & NK_WIDGET_STATE_ACTIVED) {
        background = &style->combo.active;
        text.text = style->combo.label_active;
    } else if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER) {
        background = &style->combo.hover;
        text.text = style->combo.label_hover;
    } else {
        background = &style->combo.normal;
        text.text = style->combo.label_normal;
    }
    if (background->type == NK_STYLE_ITEM_IMAGE) {
        text.background = nk_rgba(0,0,0,0);
        nk_draw_image(&win->buffer, header, &background->data.image, nk_white);
    } else {
        text.background = background->data.color;
        nk_fill_rect(&win->buffer, header, style->combo.rounding, background->data.color);
        nk_stroke_rect(&win->buffer, header, style->combo.rounding, style->combo.border, style->combo.border_color);
    }
    {
        struct nk_rect content;
        struct nk_rect button;
        struct nk_rect label;
        struct nk_rect image;

        enum nk_symbol_type sym;
        if (ctx->last_widget_state & NK_WIDGET_STATE_HOVER)
            sym = style->combo.sym_hover;
        else if (is_clicked)
            sym = style->combo.sym_active;
        else sym = style->combo.sym_normal;

        /* calculate button */
        button.w = header.h - 2 * style->combo.button_padding.y;
        button.x = (header.x + header.w - header.h) - style->combo.button_padding.x;
        button.y = header.y + style->combo.button_padding.y;
        button.h = button.w;

        content.x = button.x + style->combo.button.padding.x;
        content.y = button.y + style->combo.button.padding.y;
        content.w = button.w - 2 * style->combo.button.padding.x;
        content.h = button.h - 2 * style->combo.button.padding.y;
        nk_draw_button_symbol(&win->buffer, &button, &content, ctx->last_widget_state,
            &ctx->style.combo.button, sym, style->font);

        /* draw image */
        image.x = header.x + style->combo.content_padding.x;
        image.y = header.y + style->combo.content_padding.y;
        image.h = header.h - 2 * style->combo.content_padding.y;
        image.w = image.h;
        nk_draw_image(&win->buffer, image, &img, nk_white);

        /* draw label */
        text.padding = nk_vec2(0,0);
        label.x = image.x + image.w + style->combo.spacing.x + style->combo.content_padding.x;
        label.y = header.y + style->combo.content_padding.y;
        label.w = (button.x - style->combo.content_padding.x) - label.x;
        label.h = header.h - 2 * style->combo.content_padding.y;
        nk_widget_text(&win->buffer, label, selected, len, &text, NK_TEXT_LEFT, style->font);
    }
    return nk_combo_begin(ctx, win, size, is_clicked, header);
}

NK_API int nk_combo_begin_symbol_label(struct nk_context *ctx,
    const char *selected, enum nk_symbol_type type, struct nk_vec2 size)
{return nk_combo_begin_symbol_text(ctx, selected, nk_strlen(selected), type, size);}

NK_API int nk_combo_begin_image_label(struct nk_context *ctx,
    const char *selected, struct nk_image img, struct nk_vec2 size)
{return nk_combo_begin_image_text(ctx, selected, nk_strlen(selected), img, size);}

NK_API int nk_combo_item_text(struct nk_context *ctx, const char *text, int len,nk_flags align)
{return nk_contextual_item_text(ctx, text, len, align);}

NK_API int nk_combo_item_label(struct nk_context *ctx, const char *label, nk_flags align)
{return nk_contextual_item_label(ctx, label, align);}

NK_API int nk_combo_item_image_text(struct nk_context *ctx, struct nk_image img, const char *text,
    int len, nk_flags alignment)
{return nk_contextual_item_image_text(ctx, img, text, len, alignment);}

NK_API int nk_combo_item_image_label(struct nk_context *ctx, struct nk_image img,
    const char *text, nk_flags alignment)
{return nk_contextual_item_image_label(ctx, img, text, alignment);}

NK_API int nk_combo_item_symbol_text(struct nk_context *ctx, enum nk_symbol_type sym,
    const char *text, int len, nk_flags alignment)
{return nk_contextual_item_symbol_text(ctx, sym, text, len, alignment);}

NK_API int nk_combo_item_symbol_label(struct nk_context *ctx, enum nk_symbol_type sym,
    const char *label, nk_flags alignment)
{return nk_contextual_item_symbol_label(ctx, sym, label, alignment);}

NK_API void nk_combo_end(struct nk_context *ctx)
{nk_contextual_end(ctx);}

NK_API void nk_combo_close(struct nk_context *ctx)
{nk_contextual_close(ctx);}

NK_API int
nk_combo(struct nk_context *ctx, const char **items, int count,
    int selected, int item_height, struct nk_vec2 size)
{
    int i = 0;
    int max_height;
    struct nk_vec2 item_spacing;
    struct nk_vec2 window_padding;

    NK_ASSERT(ctx);
    NK_ASSERT(items);
    NK_ASSERT(ctx->current);
    if (!ctx || !items ||!count)
        return selected;

    item_spacing = ctx->style.window.spacing;
    window_padding = nk_panel_get_padding(&ctx->style, ctx->current->layout->type);
    max_height = count * item_height + count * (int)item_spacing.y;
    max_height += (int)item_spacing.y * 2 + (int)window_padding.y * 2;
    size.y = NK_MIN(size.y, (float)max_height);
    if (nk_combo_begin_label(ctx, items[selected], size)) {
        nk_layout_row_dynamic(ctx, (float)item_height, 1);
        for (i = 0; i < count; ++i) {
            if (nk_combo_item_label(ctx, items[i], NK_TEXT_LEFT))
                selected = i;
        }
        nk_combo_end(ctx);
    }
    return selected;
}

NK_API int
nk_combo_separator(struct nk_context *ctx, const char *items_separated_by_separator,
    int separator, int selected, int count, int item_height, struct nk_vec2 size)
{
    int i;
    int max_height;
    struct nk_vec2 item_spacing;
    struct nk_vec2 window_padding;
    const char *current_item;
    const char *iter;
    int length = 0;

    NK_ASSERT(ctx);
    NK_ASSERT(items_separated_by_separator);
    if (!ctx || !items_separated_by_separator)
        return selected;

    /* calculate popup window */
    item_spacing = ctx->style.window.spacing;
    window_padding = nk_panel_get_padding(&ctx->style, ctx->current->layout->type);
    max_height = count * item_height + count * (int)item_spacing.y;
    max_height += (int)item_spacing.y * 2 + (int)window_padding.y * 2;
    size.y = NK_MIN(size.y, (float)max_height);

    /* find selected item */
    current_item = items_separated_by_separator;
    for (i = 0; i < count; ++i) {
        iter = current_item;
        while (*iter && *iter != separator) iter++;
        length = (int)(iter - current_item);
        if (i == selected) break;
        current_item = iter + 1;
    }

    if (nk_combo_begin_text(ctx, current_item, length, size)) {
        current_item = items_separated_by_separator;
        nk_layout_row_dynamic(ctx, (float)item_height, 1);
        for (i = 0; i < count; ++i) {
            iter = current_item;
            while (*iter && *iter != separator) iter++;
            length = (int)(iter - current_item);
            if (nk_combo_item_text(ctx, current_item, length, NK_TEXT_LEFT))
                selected = i;
            current_item = current_item + length + 1;
        }
        nk_combo_end(ctx);
    }
    return selected;
}

NK_API int
nk_combo_string(struct nk_context *ctx, const char *items_separated_by_zeros,
    int selected, int count, int item_height, struct nk_vec2 size)
{return nk_combo_separator(ctx, items_separated_by_zeros, '\0', selected, count, item_height, size);}

NK_API int
nk_combo_callback(struct nk_context *ctx, void(*item_getter)(void*, int, const char**),
    void *userdata, int selected, int count, int item_height, struct nk_vec2 size)
{
    int i;
    int max_height;
    struct nk_vec2 item_spacing;
    struct nk_vec2 window_padding;
    const char *item;

    NK_ASSERT(ctx);
    NK_ASSERT(item_getter);
    if (!ctx || !item_getter)
        return selected;

    /* calculate popup window */
    item_spacing = ctx->style.window.spacing;
    window_padding = nk_panel_get_padding(&ctx->style, ctx->current->layout->type);
    max_height = count * item_height + count * (int)item_spacing.y;
    max_height += (int)item_spacing.y * 2 + (int)window_padding.y * 2;
    size.y = NK_MIN(size.y, (float)max_height);

    item_getter(userdata, selected, &item);
    if (nk_combo_begin_label(ctx, item, size)) {
        nk_layout_row_dynamic(ctx, (float)item_height, 1);
        for (i = 0; i < count; ++i) {
            item_getter(userdata, i, &item);
            if (nk_combo_item_label(ctx, item, NK_TEXT_LEFT))
                selected = i;
        }
        nk_combo_end(ctx);
    }
    return selected;
}

NK_API void nk_combobox(struct nk_context *ctx, const char **items, int count,
    int *selected, int item_height, struct nk_vec2 size)
{*selected = nk_combo(ctx, items, count, *selected, item_height, size);}

NK_API void nk_combobox_string(struct nk_context *ctx, const char *items_separated_by_zeros,
    int *selected, int count, int item_height, struct nk_vec2 size)
{*selected = nk_combo_string(ctx, items_separated_by_zeros, *selected, count, item_height, size);}

NK_API void nk_combobox_separator(struct nk_context *ctx, const char *items_separated_by_separator,
    int separator,int *selected, int count, int item_height, struct nk_vec2 size)
{*selected = nk_combo_separator(ctx, items_separated_by_separator, separator,
    *selected, count, item_height, size);}

NK_API void nk_combobox_callback(struct nk_context *ctx,
    void(*item_getter)(void* data, int id, const char **out_text),
    void *userdata, int *selected, int count, int item_height, struct nk_vec2 size)
{*selected = nk_combo_callback(ctx, item_getter, userdata,  *selected, count, item_height, size);}

/*
 * -------------------------------------------------------------
 *
 *                          MENU
 *
 * --------------------------------------------------------------
 */
NK_INTERN int
nk_menu_begin(struct nk_context *ctx, struct nk_window *win,
    const char *id, int is_clicked, struct nk_rect header, struct nk_vec2 size)
{
    int is_open = 0;
    int is_active = 0;
    struct nk_rect body;
    struct nk_window *popup;
    nk_hash hash = nk_murmur_hash(id, (int)nk_strlen(id), NK_PANEL_MENU);

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    body.x = header.x;
    body.w = size.x;
    body.y = header.y + header.h;
    body.h = size.y;

    popup = win->popup.win;
    is_open = popup ? nk_true : nk_false;
    is_active = (popup && (win->popup.name == hash) && win->popup.type == NK_PANEL_MENU);
    if ((is_clicked && is_open && !is_active) || (is_open && !is_active) ||
        (!is_open && !is_active && !is_clicked)) return 0;
    if (!nk_nonblock_begin(ctx, NK_WINDOW_NO_SCROLLBAR, body, header, NK_PANEL_MENU))
        return 0;

    win->popup.type = NK_PANEL_MENU;
    win->popup.name = hash;
    return 1;
}

NK_API int
nk_menu_begin_text(struct nk_context *ctx, const char *title, int len,
    nk_flags align, struct nk_vec2 size)
{
    struct nk_window *win;
    const struct nk_input *in;
    struct nk_rect header;
    int is_clicked = nk_false;
    nk_flags state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    state = nk_widget(&header, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || win->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    if (nk_do_button_text(&ctx->last_widget_state, &win->buffer, header,
        title, len, align, NK_BUTTON_DEFAULT, &ctx->style.menu_button, in, ctx->style.font))
        is_clicked = nk_true;
    return nk_menu_begin(ctx, win, title, is_clicked, header, size);
}

NK_API int nk_menu_begin_label(struct nk_context *ctx,
    const char *text, nk_flags align, struct nk_vec2 size)
{return nk_menu_begin_text(ctx, text, nk_strlen(text), align, size);}

NK_API int
nk_menu_begin_image(struct nk_context *ctx, const char *id, struct nk_image img,
    struct nk_vec2 size)
{
    struct nk_window *win;
    struct nk_rect header;
    const struct nk_input *in;
    int is_clicked = nk_false;
    nk_flags state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    state = nk_widget(&header, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || win->layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    if (nk_do_button_image(&ctx->last_widget_state, &win->buffer, header,
        img, NK_BUTTON_DEFAULT, &ctx->style.menu_button, in))
        is_clicked = nk_true;
    return nk_menu_begin(ctx, win, id, is_clicked, header, size);
}

NK_API int
nk_menu_begin_symbol(struct nk_context *ctx, const char *id,
    enum nk_symbol_type sym, struct nk_vec2 size)
{
    struct nk_window *win;
    const struct nk_input *in;
    struct nk_rect header;
    int is_clicked = nk_false;
    nk_flags state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    state = nk_widget(&header, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || win->layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    if (nk_do_button_symbol(&ctx->last_widget_state,  &win->buffer, header,
        sym, NK_BUTTON_DEFAULT, &ctx->style.menu_button, in, ctx->style.font))
        is_clicked = nk_true;
    return nk_menu_begin(ctx, win, id, is_clicked, header, size);
}

NK_API int
nk_menu_begin_image_text(struct nk_context *ctx, const char *title, int len,
    nk_flags align, struct nk_image img, struct nk_vec2 size)
{
    struct nk_window *win;
    struct nk_rect header;
    const struct nk_input *in;
    int is_clicked = nk_false;
    nk_flags state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    state = nk_widget(&header, ctx);
    if (!state) return 0;
    in = (state == NK_WIDGET_ROM || win->layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    if (nk_do_button_text_image(&ctx->last_widget_state, &win->buffer,
        header, img, title, len, align, NK_BUTTON_DEFAULT, &ctx->style.menu_button,
        ctx->style.font, in))
        is_clicked = nk_true;
    return nk_menu_begin(ctx, win, title, is_clicked, header, size);
}

NK_API int nk_menu_begin_image_label(struct nk_context *ctx,
    const char *title, nk_flags align, struct nk_image img, struct nk_vec2 size)
{return nk_menu_begin_image_text(ctx, title, nk_strlen(title), align, img, size);}

NK_API int
nk_menu_begin_symbol_text(struct nk_context *ctx, const char *title, int len,
    nk_flags align, enum nk_symbol_type sym, struct nk_vec2 size)
{
    struct nk_window *win;
    struct nk_rect header;
    const struct nk_input *in;
    int is_clicked = nk_false;
    nk_flags state;

    NK_ASSERT(ctx);
    NK_ASSERT(ctx->current);
    NK_ASSERT(ctx->current->layout);
    if (!ctx || !ctx->current || !ctx->current->layout)
        return 0;

    win = ctx->current;
    state = nk_widget(&header, ctx);
    if (!state) return 0;

    in = (state == NK_WIDGET_ROM || win->layout->flags & NK_WINDOW_ROM) ? 0 : &ctx->input;
    if (nk_do_button_text_symbol(&ctx->last_widget_state, &win->buffer,
        header, sym, title, len, align, NK_BUTTON_DEFAULT, &ctx->style.menu_button,
        ctx->style.font, in)) is_clicked = nk_true;
    return nk_menu_begin(ctx, win, title, is_clicked, header, size);
}

NK_API int nk_menu_begin_symbol_label(struct nk_context *ctx,
    const char *title, nk_flags align, enum nk_symbol_type sym, struct nk_vec2 size )
{return nk_menu_begin_symbol_text(ctx, title, nk_strlen(title), align,sym,size);}

NK_API int nk_menu_item_text(struct nk_context *ctx, const char *title, int len, nk_flags align)
{return nk_contextual_item_text(ctx, title, len, align);}

NK_API int nk_menu_item_label(struct nk_context *ctx, const char *label, nk_flags align)
{return nk_contextual_item_label(ctx, label, align);}

NK_API int nk_menu_item_image_label(struct nk_context *ctx, struct nk_image img,
    const char *label, nk_flags align)
{return nk_contextual_item_image_label(ctx, img, label, align);}

NK_API int nk_menu_item_image_text(struct nk_context *ctx, struct nk_image img,
    const char *text, int len, nk_flags align)
{return nk_contextual_item_image_text(ctx, img, text, len, align);}

NK_API int nk_menu_item_symbol_text(struct nk_context *ctx, enum nk_symbol_type sym,
    const char *text, int len, nk_flags align)
{return nk_contextual_item_symbol_text(ctx, sym, text, len, align);}

NK_API int nk_menu_item_symbol_label(struct nk_context *ctx, enum nk_symbol_type sym,
    const char *label, nk_flags align)
{return nk_contextual_item_symbol_label(ctx, sym, label, align);}

NK_API void nk_menu_close(struct nk_context *ctx)
{nk_contextual_close(ctx);}

NK_API void
nk_menu_end(struct nk_context *ctx)
{nk_contextual_end(ctx);}

#endif /* NK_IMPLEMENTATION */