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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 Amount <
ui_type = "slider";
ui_label = "Amount";
ui_min = 0.0; ui_max = 3.0; ui_step = 0.01;
> = 0.6;
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_Sharpen(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
{
float2 texel = float2(BUFFER_RCP_WIDTH, BUFFER_RCP_HEIGHT);
float3 centre = tex2D(BackBuffer, uv).rgb;
float3 blur = tex2D(BackBuffer, uv + float2(-texel.x, 0.0)).rgb;
blur += tex2D(BackBuffer, uv + float2(texel.x, 0.0)).rgb;
blur += tex2D(BackBuffer, uv + float2(0.0, -texel.y)).rgb;
blur += tex2D(BackBuffer, uv + float2(0.0, texel.y)).rgb;
blur *= 0.25;
return float4(centre + (centre - blur) * Amount, 1.0);
}
technique Sharpen <
ui_label = "Sharpen";
ui_tooltip = "Unsharp mask that brings back edge detail lost to scaling. Most useful after upscaling a low internal resolution.";
>
{
pass
{
VertexShader = VS_PostProcess;
PixelShader = PS_Sharpen;
}
}
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