Duckstation/data/shaders/simple-gamma.glsl

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/*
[configuration]
[OptionRangeFloat]
GUIName = Gamma In
OptionName = GAMMA_IN
MinValue = 0.1
MaxValue = 10.0
StepAmount = 0.1
DefaultValue = 2.2
[OptionRangeFloat]
GUIName = Gamma Out
OptionName = GAMMA_OUT
MinValue = 0.1
MaxValue = 10.0
StepAmount = 0.1
DefaultValue = 2.2
[/configuration]
*/
void main()
{
float4 color = Sample();
float gamma_in = GetOption(GAMMA_IN);
float gamma_out = 1.0f / GetOption(GAMMA_OUT);
color.rgb = pow(color.rgb, float3(gamma_in, gamma_in, gamma_in));
color.rgb = pow(color.rgb, float3(gamma_out, gamma_out, gamma_out));
SetOutput(saturate(color));
}