15 lines
461 B
GLSL
15 lines
461 B
GLSL
// Values obtained from: http://en.wikipedia.org/wiki/Grayscale#Luma_coding_in_video_systems
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vec3 LumaFactors = vec3(0.299, 0.587, 0.114);
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void windowShader(inout vec4 color) {
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// average brightness
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float luma = dot(vec3(color.r, color.g, color.b), LumaFactors);
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if (color.g < color.b) {
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color = vec4(luma, luma, color.b, color.a);
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} else {
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color = vec4(luma, color.g, luma, color.a);
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}
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// color = vec4(luma, color.g, color.b, color.a);
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}
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