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///////////////////////////////////////////////////////////////////////////////////////////////////
// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
///////////////////////////////////////////////////////////////////////////////////////////////////
// Created : 2005-12-21
// Updated : 2007-02-22
// Licence : This source is under MIT License
// File : glm/gtx/color_space.inl
///////////////////////////////////////////////////////////////////////////////////////////////////
namespace glm{
namespace gtx{
namespace color_space
{
template <typename T>
GLM_FUNC_QUALIFIER detail::tvec3<T> rgbColor(const detail::tvec3<T>& hsvColor)
{
detail::tvec3<T> hsv = hsvColor;
detail::tvec3<T> rgbColor;
if(hsv.y == T(0))
// achromatic (grey)
rgbColor = detail::tvec3<T>(hsv.z);
else
{
T sector = floor(hsv.x / T(60));
T frac = (hsv.x / T(60)) - sector;
// factorial part of h
T o = hsv.z * (T(1) - hsv.y);
T p = hsv.z * (T(1) - hsv.y * frac);
T q = hsv.z * (T(1) - hsv.y * (T(1) - frac));
switch(int(sector))
{
default:
case 0:
rgbColor.r = hsv.z;
rgbColor.g = q;
rgbColor.b = o;
break;
case 1:
rgbColor.r = p;
rgbColor.g = hsv.z;
rgbColor.b = o;
break;
case 2:
rgbColor.r = o;
rgbColor.g = hsv.z;
rgbColor.b = q;
break;
case 3:
rgbColor.r = o;
rgbColor.g = p;
rgbColor.b = hsv.z;
break;
case 4:
rgbColor.r = q;
rgbColor.g = o;
rgbColor.b = hsv.z;
break;
case 5:
rgbColor.r = hsv.z;
rgbColor.g = o;
rgbColor.b = p;
break;
}
}
return rgbColor;
}
template <typename T>
GLM_FUNC_QUALIFIER detail::tvec3<T> hsvColor(const detail::tvec3<T>& rgbColor)
{
detail::tvec3<T> hsv = rgbColor;
float Min = min(min(rgbColor.r, rgbColor.g), rgbColor.b);
float Max = max(max(rgbColor.r, rgbColor.g), rgbColor.b);
float Delta = Max - Min;
hsv.z = Max;
if(Max != T(0))
{
hsv.y = Delta / hsv.z;
T h = T(0);
if(rgbColor.r == Max)
// between yellow & magenta
h = T(0) + T(60) * (rgbColor.g - rgbColor.b) / Delta;
else if(rgbColor.g == Max)
// between cyan & yellow
h = T(120) + T(60) * (rgbColor.b - rgbColor.r) / Delta;
else
// between magenta & cyan
h = T(240) + T(60) * (rgbColor.r - rgbColor.g) / Delta;
if(h < T(0))
hsv.x = h + T(360);
else
hsv.x = h;
}
else
{
// If r = g = b = 0 then s = 0, h is undefined
hsv.y = T(0);
hsv.x = T(0);
}
return hsv;
}
template <typename T>
GLM_FUNC_QUALIFIER detail::tmat4x4<T> saturation(const T s)
{
detail::tvec3<T> rgbw = detail::tvec3<T>(T(0.2126), T(0.7152), T(0.0722));
T col0 = (T(1) - s) * rgbw.r;
T col1 = (T(1) - s) * rgbw.g;
T col2 = (T(1) - s) * rgbw.b;
detail::tmat4x4<T> result(T(1));
result[0][0] = col0 + s;
result[0][1] = col0;
result[0][2] = col0;
result[1][0] = col1;
result[1][1] = col1 + s;
result[1][2] = col1;
result[2][0] = col2;
result[2][1] = col2;
result[2][2] = col2 + s;
return result;
}
template <typename T>
GLM_FUNC_QUALIFIER detail::tvec3<T> saturation(const T s, const detail::tvec3<T>& color)
{
return detail::tvec3<T>(saturation(s) * detail::tvec4<T>(color, T(0)));
}
template <typename T>
GLM_FUNC_QUALIFIER detail::tvec4<T> saturation(const T s, const detail::tvec4<T>& color)
{
return saturation(s) * color;
}
template <typename T>
GLM_FUNC_QUALIFIER T luminosity(const detail::tvec3<T>& color)
{
const detail::tvec3<T> tmp = detail::tvec3<T>(0.33, 0.59, 0.11);
return dot(color, tmp);
}
}//namespace color_space
}//namespace gtx
}//namespace glm
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