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141 lines
3.1 KiB
141 lines
3.1 KiB
/// @ref gtx_color_space |
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namespace glm |
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{ |
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template<typename T, qualifier Q> |
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GLM_FUNC_QUALIFIER vec<3, T, Q> rgbColor(const vec<3, T, Q>& hsvColor) |
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{ |
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vec<3, T, Q> hsv = hsvColor; |
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vec<3, T, Q> rgbColor; |
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if(hsv.y == static_cast<T>(0)) |
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// achromatic (grey) |
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rgbColor = vec<3, T, Q>(hsv.z); |
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else |
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{ |
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T sector = floor(hsv.x * (T(1) / T(60))); |
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T frac = (hsv.x * (T(1) / 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, qualifier Q> |
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GLM_FUNC_QUALIFIER vec<3, T, Q> hsvColor(const vec<3, T, Q>& rgbColor) |
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{ |
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vec<3, T, Q> 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 != static_cast<T>(0)) |
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{ |
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hsv.y = Delta / hsv.z; |
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T h = static_cast<T>(0); |
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if(rgbColor.r == Max) |
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// between yellow & magenta |
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h = static_cast<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 = static_cast<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 = static_cast<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 = static_cast<T>(0); |
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hsv.x = static_cast<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 mat<4, 4, T, defaultp> saturation(T const s) |
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{ |
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vec<3, T, defaultp> rgbw = vec<3, T, defaultp>(T(0.2126), T(0.7152), T(0.0722)); |
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vec<3, T, defaultp> const col((T(1) - s) * rgbw); |
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mat<4, 4, T, defaultp> result(T(1)); |
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result[0][0] = col.x + s; |
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result[0][1] = col.x; |
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result[0][2] = col.x; |
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result[1][0] = col.y; |
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result[1][1] = col.y + s; |
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result[1][2] = col.y; |
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result[2][0] = col.z; |
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result[2][1] = col.z; |
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result[2][2] = col.z + s; |
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return result; |
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} |
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template<typename T, qualifier Q> |
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GLM_FUNC_QUALIFIER vec<3, T, Q> saturation(const T s, const vec<3, T, Q>& color) |
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{ |
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return vec<3, T, Q>(saturation(s) * vec<4, T, Q>(color, T(0))); |
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} |
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template<typename T, qualifier Q> |
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GLM_FUNC_QUALIFIER vec<4, T, Q> saturation(const T s, const vec<4, T, Q>& color) |
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{ |
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return saturation(s) * color; |
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} |
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template<typename T, qualifier Q> |
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GLM_FUNC_QUALIFIER T luminosity(const vec<3, T, Q>& color) |
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{ |
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const vec<3, T, Q> tmp = vec<3, T, Q>(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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