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149 lines
3.6 KiB
149 lines
3.6 KiB
///////////////////////////////////////////////////////////////////////////////////////////////////
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// OpenGL Mathematics Copyright (c) 2005 - 2013 G-Truc Creation (www.g-truc.net)
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///////////////////////////////////////////////////////////////////////////////////////////////////
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// Created : 2005-12-21
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// Updated : 2007-02-22
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// Licence : This source is under MIT License
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// File : glm/gtx/color_space.inl
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///////////////////////////////////////////////////////////////////////////////////////////////////
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namespace glm
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{
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template <typename T>
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GLM_FUNC_QUALIFIER detail::tvec3<T> rgbColor(const detail::tvec3<T>& hsvColor)
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{
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detail::tvec3<T> hsv = hsvColor;
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detail::tvec3<T> rgbColor;
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if(hsv.y == T(0))
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// achromatic (grey)
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rgbColor = detail::tvec3<T>(hsv.z);
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else
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{
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T sector = floor(hsv.x / T(60));
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T frac = (hsv.x / T(60)) - sector;
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// factorial part of h
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T o = hsv.z * (T(1) - hsv.y);
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T p = hsv.z * (T(1) - hsv.y * frac);
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T q = hsv.z * (T(1) - hsv.y * (T(1) - frac));
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switch(int(sector))
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{
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default:
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case 0:
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rgbColor.r = hsv.z;
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rgbColor.g = q;
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rgbColor.b = o;
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break;
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case 1:
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rgbColor.r = p;
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rgbColor.g = hsv.z;
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rgbColor.b = o;
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break;
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case 2:
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rgbColor.r = o;
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rgbColor.g = hsv.z;
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rgbColor.b = q;
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break;
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case 3:
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rgbColor.r = o;
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rgbColor.g = p;
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rgbColor.b = hsv.z;
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break;
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case 4:
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rgbColor.r = q;
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rgbColor.g = o;
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rgbColor.b = hsv.z;
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break;
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case 5:
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rgbColor.r = hsv.z;
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rgbColor.g = o;
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rgbColor.b = p;
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break;
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}
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}
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return rgbColor;
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}
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template <typename T>
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GLM_FUNC_QUALIFIER detail::tvec3<T> hsvColor(const detail::tvec3<T>& rgbColor)
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{
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detail::tvec3<T> hsv = rgbColor;
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float Min = min(min(rgbColor.r, rgbColor.g), rgbColor.b);
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float Max = max(max(rgbColor.r, rgbColor.g), rgbColor.b);
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float Delta = Max - Min;
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hsv.z = Max;
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if(Max != T(0))
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{
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hsv.y = Delta / hsv.z;
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T h = T(0);
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if(rgbColor.r == Max)
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// between yellow & magenta
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h = T(0) + T(60) * (rgbColor.g - rgbColor.b) / Delta;
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else if(rgbColor.g == Max)
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// between cyan & yellow
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h = T(120) + T(60) * (rgbColor.b - rgbColor.r) / Delta;
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else
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// between magenta & cyan
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h = T(240) + T(60) * (rgbColor.r - rgbColor.g) / Delta;
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if(h < T(0))
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hsv.x = h + T(360);
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else
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hsv.x = h;
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}
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else
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{
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// If r = g = b = 0 then s = 0, h is undefined
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hsv.y = T(0);
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hsv.x = T(0);
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}
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return hsv;
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}
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template <typename T>
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GLM_FUNC_QUALIFIER detail::tmat4x4<T> saturation(const T s)
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{
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detail::tvec3<T> rgbw = detail::tvec3<T>(T(0.2126), T(0.7152), T(0.0722));
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T col0 = (T(1) - s) * rgbw.r;
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T col1 = (T(1) - s) * rgbw.g;
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T col2 = (T(1) - s) * rgbw.b;
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detail::tmat4x4<T> result(T(1));
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result[0][0] = col0 + s;
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result[0][1] = col0;
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result[0][2] = col0;
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result[1][0] = col1;
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result[1][1] = col1 + s;
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result[1][2] = col1;
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result[2][0] = col2;
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result[2][1] = col2;
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result[2][2] = col2 + s;
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return result;
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}
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template <typename T>
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GLM_FUNC_QUALIFIER detail::tvec3<T> saturation(const T s, const detail::tvec3<T>& color)
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{
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return detail::tvec3<T>(saturation(s) * detail::tvec4<T>(color, T(0)));
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}
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template <typename T>
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GLM_FUNC_QUALIFIER detail::tvec4<T> saturation(const T s, const detail::tvec4<T>& color)
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{
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return saturation(s) * color;
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}
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template <typename T>
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GLM_FUNC_QUALIFIER T luminosity(const detail::tvec3<T>& color)
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{
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const detail::tvec3<T> tmp = detail::tvec3<T>(0.33, 0.59, 0.11);
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return dot(color, tmp);
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}
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}//namespace glm
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