stk-code_catmod/data/shaders/utils/getRGBfromCIEXxy.frag
2014-09-24 01:19:37 +02:00

18 lines
516 B
GLSL

// Using numerical value from here
// http://content.gpwiki.org/index.php/D3DBook:High-Dynamic_Range_Rendering
vec3 getRGBFromCIEXxy(vec3 YxyColor)
{
float Yovery = YxyColor.x / YxyColor.z;
vec3 XYZ = vec3(YxyColor.y * Yovery, YxyColor.x, (1. - YxyColor.y - YxyColor.z) * Yovery);
mat3 XYZ2RGB = transpose(mat3(
vec3(3.2405, -.9693, .0556),
vec3(-1.5371, 1.8760, -.2040),
vec3(-.4985, .0416, 1.0572)));
vec3 RGBColor = XYZ2RGB * XYZ;
return max(RGBColor, vec3(0.));
}