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/* Copyright (C) 2010-2020 The RetroArch team
*
* ---------------------------------------------------------------------------------------
* The following license statement only applies to this file (retro_math.h).
* ---------------------------------------------------------------------------------------
*
* Permission is hereby granted, free of charge,
* to any person obtaining a copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
* and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#ifndef _LIBRETRO_COMMON_MATH_H
#define _LIBRETRO_COMMON_MATH_H
#include <stdint.h>
#if defined(_WIN32) && !defined(_XBOX)
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#elif defined(_WIN32) && defined(_XBOX)
#include <Xtl.h>
#endif
#include <limits.h>
#ifdef _MSC_VER
#include <compat/msvc.h>
#endif
#include <retro_inline.h>
#ifndef M_PI
#if !defined(USE_MATH_DEFINES)
#define M_PI 3.14159265358979323846264338327
#endif
#endif
#ifndef MAX
#define MAX(a, b) ((a) > (b) ? (a) : (b))
#endif
#ifndef MIN
#define MIN(a, b) ((a) < (b) ? (a) : (b))
#endif
/**
* next_pow2:
* @v : initial value
*
* Get next power of 2 value based on initial value.
*
* Returns: next power of 2 value (derived from @v).
**/
static INLINE uint32_t next_pow2(uint32_t v)
{
v--;
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
v++;
return v;
}
/**
* prev_pow2:
* @v : initial value
*
* Get previous power of 2 value based on initial value.
*
* Returns: previous power of 2 value (derived from @v).
**/
static INLINE uint32_t prev_pow2(uint32_t v)
{
v |= v >> 1;
v |= v >> 2;
v |= v >> 4;
v |= v >> 8;
v |= v >> 16;
return v - (v >> 1);
}
/**
* clamp:
* @v : initial value
*
* Get the clamped value based on initial value.
*
* Returns: clamped value (derived from @v).
**/
static INLINE float clamp_value(float v, float min, float max)
{
return v <= min ? min : v >= max ? max : v;
}
/**
* saturate_value:
* @v : initial value
*
* Get the clamped 0.0-1.0 value based on initial value.
*
* Returns: clamped 0.0-1.0 value (derived from @v).
**/
static INLINE float saturate_value(float v)
{
return clamp_value(v, 0.0f, 1.0f);
}
/**
* dot_product:
* @a : left hand vector value
* @b : right hand vector value
*
* Get the dot product of the two passed in vectors.
*
* Returns: dot product value (derived from @a and @b).
**/
static INLINE float dot_product(const float* a, const float* b)
{
return (a[0] * b[0]) + (a[1] * b[1]) + (a[2] * b[2]);
}
/**
* convert_rgb_to_yxy:
* @rgb : in RGB colour space value
* @Yxy : out Yxy colour space value
*
* Convert from RGB colour space to Yxy colour space.
*
* Returns: Yxy colour space value (derived from @rgb).
**/
static INLINE void convert_rgb_to_yxy(const float* rgb, float* Yxy)
{
float inv;
float xyz[3];
float one[3] = {1.0, 1.0, 1.0};
float rgb_xyz[3][3] = {
{0.4124564, 0.3575761, 0.1804375},
{0.2126729, 0.7151522, 0.0721750},
{0.0193339, 0.1191920, 0.9503041}
};
xyz[0] = dot_product(rgb_xyz[0], rgb);
xyz[1] = dot_product(rgb_xyz[1], rgb);
xyz[2] = dot_product(rgb_xyz[2], rgb);
inv = 1.0f / dot_product(xyz, one);
Yxy[0] = xyz[1];
Yxy[1] = xyz[0] * inv;
Yxy[2] = xyz[1] * inv;
}
/**
* convert_yxy_to_rgb:
* @rgb : in Yxy colour space value
* @Yxy : out rgb colour space value
*
* Convert from Yxy colour space to rgb colour space.
*
* Returns: rgb colour space value (derived from @Yxy).
**/
static INLINE void convert_yxy_to_rgb(const float* Yxy, float* rgb)
{
float xyz[3];
float xyz_rgb[3][3] = {
{3.2404542, -1.5371385, -0.4985314},
{-0.9692660, 1.8760108, 0.0415560},
{0.0556434, -0.2040259, 1.0572252}
};
xyz[0] = Yxy[0] * Yxy[1] / Yxy[2];
xyz[1] = Yxy[0];
xyz[2] = Yxy[0] * (1.0 - Yxy[1] - Yxy[2]) / Yxy[2];
rgb[0] = dot_product(xyz_rgb[0], xyz);
rgb[1] = dot_product(xyz_rgb[1], xyz);
rgb[2] = dot_product(xyz_rgb[2], xyz);
}
#endif
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