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Diffstat (limited to 'glm-master/glm/gtx/color_space.inl')
-rw-r--r-- | glm-master/glm/gtx/color_space.inl | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/glm-master/glm/gtx/color_space.inl b/glm-master/glm/gtx/color_space.inl new file mode 100644 index 0000000..0a7059f --- /dev/null +++ b/glm-master/glm/gtx/color_space.inl @@ -0,0 +1,141 @@ +/// @ref gtx_color_space + +namespace glm +{ + template<typename T, qualifier Q> + GLM_FUNC_QUALIFIER vec<3, T, Q> rgbColor(const vec<3, T, Q>& hsvColor) + { + vec<3, T, Q> hsv = hsvColor; + vec<3, T, Q> rgbColor; + + if(hsv.y == static_cast<T>(0)) + // achromatic (grey) + rgbColor = vec<3, T, Q>(hsv.z); + else + { + T sector = floor(hsv.x * (T(1) / T(60))); + T frac = (hsv.x * (T(1) / 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, qualifier Q> + GLM_FUNC_QUALIFIER vec<3, T, Q> hsvColor(const vec<3, T, Q>& rgbColor) + { + vec<3, T, Q> hsv = rgbColor; + T Min = min(min(rgbColor.r, rgbColor.g), rgbColor.b); + T Max = max(max(rgbColor.r, rgbColor.g), rgbColor.b); + T Delta = Max - Min; + + hsv.z = Max; + + if(Max != static_cast<T>(0)) + { + hsv.y = Delta / hsv.z; + T h = static_cast<T>(0); + + if(rgbColor.r == Max) + // between yellow & magenta + h = static_cast<T>(0) + T(60) * (rgbColor.g - rgbColor.b) / Delta; + else if(rgbColor.g == Max) + // between cyan & yellow + h = static_cast<T>(120) + T(60) * (rgbColor.b - rgbColor.r) / Delta; + else + // between magenta & cyan + h = static_cast<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 = static_cast<T>(0); + hsv.x = static_cast<T>(0); + } + + return hsv; + } + + template<typename T> + GLM_FUNC_QUALIFIER mat<4, 4, T, defaultp> saturation(T const s) + { + vec<3, T, defaultp> rgbw = vec<3, T, defaultp>(T(0.2126), T(0.7152), T(0.0722)); + + vec<3, T, defaultp> const col((T(1) - s) * rgbw); + + mat<4, 4, T, defaultp> result(T(1)); + result[0][0] = col.x + s; + result[0][1] = col.x; + result[0][2] = col.x; + result[1][0] = col.y; + result[1][1] = col.y + s; + result[1][2] = col.y; + result[2][0] = col.z; + result[2][1] = col.z; + result[2][2] = col.z + s; + + return result; + } + + template<typename T, qualifier Q> + GLM_FUNC_QUALIFIER vec<3, T, Q> saturation(const T s, const vec<3, T, Q>& color) + { + return vec<3, T, Q>(saturation(s) * vec<4, T, Q>(color, T(0))); + } + + template<typename T, qualifier Q> + GLM_FUNC_QUALIFIER vec<4, T, Q> saturation(const T s, const vec<4, T, Q>& color) + { + return saturation(s) * color; + } + + template<typename T, qualifier Q> + GLM_FUNC_QUALIFIER T luminosity(const vec<3, T, Q>& color) + { + const vec<3, T, Q> tmp = vec<3, T, Q>(0.33, 0.59, 0.11); + return dot(color, tmp); + } +}//namespace glm |