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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
// SPDX-FileCopyrightText: Copyright 2012 PPSSPP Project
// SPDX-License-Identifier: GPL-2.0-or-later
// Based on colorcorrection.fsh in PPSSPP.
texture BackBufferTex : COLOR;
sampler BackBuffer { Texture = BackBufferTex; };
uniform float Saturation <
ui_type = "slider";
ui_label = "Saturation";
ui_min = 0.0; ui_max = 2.0; ui_step = 0.01;
> = 1.0;
uniform float Brightness <
ui_type = "slider";
ui_label = "Brightness";
ui_min = 0.0; ui_max = 2.0; ui_step = 0.01;
> = 1.0;
uniform float Contrast <
ui_type = "slider";
ui_label = "Contrast";
ui_min = 0.0; ui_max = 2.0; ui_step = 0.01;
> = 1.0;
uniform float Gamma <
ui_type = "slider";
ui_label = "Gamma";
ui_min = 0.5; ui_max = 2.0; ui_step = 0.01;
> = 1.0;
void VS_PostProcess(in uint id : SV_VertexID, out float4 pos : SV_Position, out float2 uv : TEXCOORD)
{
uv = float2(float(id & 2), float((id & 1) << 1));
pos = float4(uv * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
}
float4 PS_ColorGrade(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
{
float3 rgb = tex2D(BackBuffer, uv).rgb;
float luma = dot(rgb, float3(0.2126, 0.7152, 0.0722));
rgb = lerp(float3(luma, luma, luma), rgb, Saturation);
rgb *= Brightness;
rgb = (rgb - 0.5) * Contrast + 0.5;
rgb = pow(max(rgb, 0.0), 1.0 / max(Gamma, 0.0001));
return float4(saturate(rgb), 1.0);
}
technique ColorGrade <
ui_label = "Colour Grade";
ui_tooltip = "The four basic colour controls in one pass: saturation, brightness, contrast and gamma. Reach for this before anything more specialised.";
>
{
pass
{
VertexShader = VS_PostProcess;
PixelShader = PS_ColorGrade;
}
}
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