complex.h

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/* Copyright  (C) 2010-2018 The RetroArch team
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 * The following license statement only applies to this file (complex.h).
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#ifndef __LIBRETRO_SDK_MATH_COMPLEX_H__
#define __LIBRETRO_SDK_MATH_COMPLEX_H__

#include <stdint.h>

#include <retro_inline.h>

typedef struct
{
   float real;
   float imag;
} fft_complex_t;

static INLINE fft_complex_t fft_complex_mul(fft_complex_t a,
      fft_complex_t b)
{
   fft_complex_t out;
   out.real = a.real * b.real - a.imag * b.imag;
   out.imag = a.imag * b.real + a.real * b.imag;

   return out;

}

static INLINE fft_complex_t fft_complex_add(fft_complex_t a,
      fft_complex_t b)
{
   fft_complex_t out;
   out.real = a.real + b.real;
   out.imag = a.imag + b.imag;

   return out;

}

static INLINE fft_complex_t fft_complex_sub(fft_complex_t a,
      fft_complex_t b)
{
   fft_complex_t out;
   out.real = a.real - b.real;
   out.imag = a.imag - b.imag;

   return out;

}

static INLINE fft_complex_t fft_complex_conj(fft_complex_t a)
{
   fft_complex_t out;
   out.real = a.real;
   out.imag = -a.imag;

   return out;
}

#endif