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Write a shader to convert CIE to RGB.

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vlj 2014-03-29 00:06:02 +01:00 committed by Vincent Lejeune
parent 881d0b9954
commit a2ab6fc80c
1 changed files with 17 additions and 0 deletions
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data/shaders/utils/getRGBfromCIEXxy.frag Normal file
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// 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 XYZ2sRGB = mat3(
vec3(3.2405, -.9693, .0556),
vec3(-1.5371, 1.8760, -.2040),
vec3(-.4985, .0416, 1.0572));
vec3 sRGBColor = XYZ2sRGB * XYZ;
return vec3(pow(sRGBColor.x, 2.2), pow(sRGBColor.y, 2.2), pow(sRGBColor.z, 2.2));
}