ShaderTypes.h

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//
//  ShaderTypes.h
//  MetalRenderer
//
//  Created by Stuart Carnie on 5/31/18.
//  Copyright © 2018 Stuart Carnie. All rights reserved.
//

//
//  Header containing types and enum constants shared between Metal shaders and Swift/ObjC source
//
#ifndef ShaderTypes_h
#define ShaderTypes_h

#ifdef __METAL_VERSION__
#define NS_ENUM(_type, _name) enum _name : _type _name; enum _name : _type
#define NSInteger metal::int32_t

#define METAL_ATTRIBUTE(x) [[attribute(x)]]
#define METAL_POSITION [[position]]
#else
#import <Foundation/Foundation.h>
#define METAL_ATTRIBUTE(x)
#define METAL_POSITION
#endif

#include <simd/simd.h>

typedef NS_ENUM(NSInteger, BufferIndex)
{
   BufferIndexPositions = 0,
   BufferIndexUniforms = 1
};

typedef NS_ENUM(NSInteger, VertexAttribute)
{
   VertexAttributePosition = 0,
   VertexAttributeTexcoord = 1,
   VertexAttributeColor = 2,
};

typedef NS_ENUM(NSInteger, TextureIndex)
{
   TextureIndexColor = 0,
};

typedef NS_ENUM(NSInteger, SamplerIndex)
{
   SamplerIndexDraw = 0,
};

typedef struct
{
   vector_float3 position METAL_ATTRIBUTE(VertexAttributePosition);
   vector_float2 texCoord METAL_ATTRIBUTE(VertexAttributeTexcoord);
} Vertex;

typedef struct
{
   vector_float4 position;
   vector_float2 texCoord;
} VertexSlang;

typedef struct
{
   vector_float4 position METAL_POSITION;
   vector_float2 texCoord;
} ColorInOut;

typedef struct
{
   matrix_float4x4 projectionMatrix;
   vector_float2 outputSize;
   float time;
} Uniforms;

typedef struct
{
   vector_float2 position  METAL_ATTRIBUTE(VertexAttributePosition);
   vector_float2 texCoord  METAL_ATTRIBUTE(VertexAttributeTexcoord);
   vector_float4 color     METAL_ATTRIBUTE(VertexAttributeColor);
} SpriteVertex;

typedef struct
{
   vector_float4 position METAL_POSITION;
   vector_float2 texCoord;
   vector_float4 color;
} FontFragmentIn;

#endif /* ShaderTypes_h */