mirror of
https://git.eden-emu.dev/eden-emu/eden.git
synced 2026-09-07 12:48:03 +00:00
CamilleLaVey
97 lines
2.9 KiB
HLSL
97 lines
2.9 KiB
HLSL
// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
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// SPDX-License-Identifier: GPL-3.0-or-later
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// SPDX-FileCopyrightText: Copyright 2015 Niklas Haas
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// SPDX-License-Identifier: MIT
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texture BackBufferTex : COLOR;
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sampler BackBuffer { Texture = BackBufferTex; };
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uniform float Threshold <
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ui_type = "slider";
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ui_label = "Threshold";
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ui_tooltip = "How flat a neighbourhood must be before it gets smoothed. Raise it to catch wider bands, lower it to keep more detail.";
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ui_min = 0.002; ui_max = 0.05; ui_step = 0.001;
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> = 0.012;
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uniform float Radius <
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ui_type = "slider";
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ui_label = "Radius";
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ui_tooltip = "How far the sampling reaches, in pixels. Wider gradients need a larger radius.";
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ui_min = 1.0; ui_max = 32.0; ui_step = 1.0;
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> = 8.0;
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uniform float Grain <
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ui_type = "slider";
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ui_label = "Dither";
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ui_tooltip = "Noise added to break up whatever banding survives the smoothing.";
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ui_min = 0.0; ui_max = 0.02; ui_step = 0.001;
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> = 0.004;
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void VS_PostProcess(in uint id : SV_VertexID, out float4 pos : SV_Position, out float2 uv : TEXCOORD)
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{
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uv = float2(0.0, 0.0);
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if (id == 2)
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{
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uv.x = 2.0;
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}
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if (id == 1)
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{
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uv.y = 2.0;
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}
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pos = float4(uv * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
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}
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float Hash(float2 p)
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{
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float3 scattered = frac(float3(p.x, p.y, p.x) * 0.1031);
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scattered += dot(scattered, scattered.yzx + 33.33);
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return frac((scattered.x + scattered.y) * scattered.z);
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}
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float4 PS_Deband(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
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{
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float2 texel = float2(BUFFER_RCP_WIDTH, BUFFER_RCP_HEIGHT);
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float3 centre = tex2D(BackBuffer, uv).rgb;
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float base = Hash(pos.xy) * 6.2831853;
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float3 total = float3(0.0, 0.0, 0.0);
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float3 deviation = float3(0.0, 0.0, 0.0);
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for (int ring = 1; ring <= 2; ++ring)
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{
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float angle = base + float(ring) * 2.3999632;
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float reach = Radius * float(ring) * 0.5;
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float2 along = float2(cos(angle), sin(angle)) * reach;
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float2 across = float2(-along.y, along.x);
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float3 s0 = tex2D(BackBuffer, uv + along * texel).rgb;
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float3 s1 = tex2D(BackBuffer, uv - along * texel).rgb;
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float3 s2 = tex2D(BackBuffer, uv + across * texel).rgb;
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float3 s3 = tex2D(BackBuffer, uv - across * texel).rgb;
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total += s0 + s1 + s2 + s3;
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deviation = max(deviation, max(max(abs(s0 - centre), abs(s1 - centre)),
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max(abs(s2 - centre), abs(s3 - centre))));
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}
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float3 average = total * 0.125;
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float3 flatness = float3(1.0, 1.0, 1.0) -
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smoothstep(Threshold * 0.5, Threshold, deviation);
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float3 result = lerp(centre, average, flatness);
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float dither = (Hash(pos.xy + float2(71.3, 41.7)) - 0.5) * Grain;
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return float4(saturate(result + dither), 1.0);
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}
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technique Deband
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{
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pass
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{
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VertexShader = VS_PostProcess;
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PixelShader = PS_Deband;
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}
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}
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