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154 lines
4.1 KiB
154 lines
4.1 KiB
/////////////////////////////////////////////////////////////////////////////////////////////////// |
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// OpenGL Mathematics Copyright (c) 2005 - 2011 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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namespace gtx{ |
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namespace color_space |
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{ |
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template <typename T> |
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inline 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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inline 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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inline 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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inline 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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inline 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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inline 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 color_space |
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}//namespace gtx |
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}//namespace glm
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