22 lines
504 B
GLSL
22 lines
504 B
GLSL
#version 330
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float Luminance(vec3 rgb)
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{
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const vec3 W = vec3(0.2125, 0.7154, 0.0721);
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return dot(rgb, W);
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}
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// The hardware conversion doesn't work on all drivers.
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// http://entropymine.com/imageworsener/srgbformula/
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float SrgbToLinear(float x)
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{
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if (x < 0.03928)
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return x * 0.0773993808; // 1.0 / 12.92
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else
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return pow((x + 0.055) / 1.055, 2.4);
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}
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vec3 SrgbToLinear(vec3 color) {
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return vec3(SrgbToLinear(color.r), SrgbToLinear(color.g), SrgbToLinear(color.b));
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}
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