18 lines
526 B
GLSL
18 lines
526 B
GLSL
// Using numerical value from here
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// http://content.gpwiki.org/index.php/D3DBook:High-Dynamic_Range_Rendering
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vec3 getRGBFromCIEXxy(vec3 YxyColor)
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{
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float Yovery = YxyColor.x / max(YxyColor.z, 0.1);
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vec3 XYZ = vec3(YxyColor.y * Yovery, YxyColor.x, (1. - YxyColor.y - YxyColor.z) * Yovery);
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mat3 XYZ2RGB = transpose(mat3(
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vec3(3.2405, -.9693, .0556),
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vec3(-1.5371, 1.8760, -.2040),
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vec3(-.4985, .0416, 1.0572)));
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vec3 RGBColor = XYZ2RGB * XYZ;
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return max(RGBColor, vec3(0.));
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}
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