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// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
// SPDX-License-Identifier: GPL-3.0-or-later
texture BackBufferTex : COLOR;
sampler BackBuffer { Texture = BackBufferTex; };
uniform float Exposure <
ui_type = "slider";
ui_label = "Exposure";
ui_min = 0.5; ui_max = 2.0; ui_step = 0.01;
> = 1.0;
uniform float Toe <
ui_type = "slider";
ui_label = "Toe";
ui_tooltip = "Above 1.0 deepens the shadows, below 1.0 lifts them.";
ui_min = 0.5; ui_max = 2.0; ui_step = 0.01;
> = 1.2;
uniform float Shoulder <
ui_type = "slider";
ui_label = "Shoulder";
ui_tooltip = "Above 1.0 opens up the highlights, below 1.0 compresses them.";
ui_min = 0.5; ui_max = 2.0; ui_step = 0.01;
> = 1.2;
uniform float Amount <
ui_type = "slider";
ui_label = "Amount";
ui_min = 0.0; ui_max = 1.0; ui_step = 0.01;
> = 0.7;
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_FilmicCurve(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
{
float3 rgb = tex2D(BackBuffer, uv).rgb;
float3 curved = saturate(rgb * Exposure);
curved = pow(max(curved, 0.0), Toe);
curved = 1.0 - pow(max(1.0 - curved, 0.0), Shoulder);
return float4(saturate(lerp(rgb, curved, Amount)), 1.0);
}
technique FilmicCurve <
ui_label = "Filmic Curve";
ui_tooltip = "Filmic contrast curve. Deepens the shadows and opens the highlights without clipping either end.";
>
{
pass
{
VertexShader = VS_PostProcess;
PixelShader = PS_FilmicCurve;
}
}
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