dolphin/Data/Sys/Shaders/grayscale2.glsl

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void main()
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{
float4 c0 = Sample();
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// Info: http://www.oreillynet.com/cs/user/view/cs_msg/8691
float avg = (0.222 * c0.r) + (0.707 * c0.g) + (0.071 * c0.b);
SetOutput(float4(avg, avg, avg, c0.a));
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}