/// @ref gtx_color_space | |
/// @file glm/gtx/color_space.inl | |
namespace glm | |
{ | |
template <typename T, precision P> | |
GLM_FUNC_QUALIFIER tvec3<T, P> rgbColor(const tvec3<T, P>& hsvColor) | |
{ | |
tvec3<T, P> hsv = hsvColor; | |
tvec3<T, P> rgbColor; | |
if(hsv.y == static_cast<T>(0)) | |
// achromatic (grey) | |
rgbColor = tvec3<T, P>(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, precision P> | |
GLM_FUNC_QUALIFIER tvec3<T, P> hsvColor(const tvec3<T, P>& rgbColor) | |
{ | |
tvec3<T, P> 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 != 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 tmat4x4<T, defaultp> saturation(T const s) | |
{ | |
tvec3<T, defaultp> rgbw = tvec3<T, defaultp>(T(0.2126), T(0.7152), T(0.0722)); | |
tvec3<T, defaultp> const col((T(1) - s) * rgbw); | |
tmat4x4<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, precision P> | |
GLM_FUNC_QUALIFIER tvec3<T, P> saturation(const T s, const tvec3<T, P>& color) | |
{ | |
return tvec3<T, P>(saturation(s) * tvec4<T, P>(color, T(0))); | |
} | |
template <typename T, precision P> | |
GLM_FUNC_QUALIFIER tvec4<T, P> saturation(const T s, const tvec4<T, P>& color) | |
{ | |
return saturation(s) * color; | |
} | |
template <typename T, precision P> | |
GLM_FUNC_QUALIFIER T luminosity(const tvec3<T, P>& color) | |
{ | |
const tvec3<T, P> tmp = tvec3<T, P>(0.33, 0.59, 0.11); | |
return dot(color, tmp); | |
} | |
}//namespace glm |