//
// Copyright (c) Andrew Porter. All Rights Reserved.
// License: https://github.com/ServiRegis/Licenses/blob/master/CODEX-CREATIVUS-ET-PUBLICUS.txt
//
#define LUMA_COEFFICIENT float3(0.2126f, 0.7152f, 0.0722f)
void main() {
float4 screen = Sample();
screen.a = dot(screen.rgb, LUMA_COEFFICIENT);
// chroma
screen.rgb = screen.rgb - screen.a;
// luma
screen.a = screen.a - 2.0f;
screen.a = screen.a * screen.a;
screen.a = 1.0f / screen.a - 0.25f;
screen.a = sqrt(screen.a);
screen.a *= 1.1547005383792515290182975610039f;
screen.rgb = screen.rgb + screen.a;
SetOutput(screen);
}
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