mirror of
https://git.eden-emu.dev/eden-emu/eden.git
synced 2026-09-08 13:11:02 +00:00
CamilleLaVey
88 lines
2.9 KiB
HLSL
88 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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texture BackBufferTex : COLOR;
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sampler BackBuffer { Texture = BackBufferTex; };
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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 blur reaches, in pixels.";
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ui_min = 1.0; ui_max = 12.0; ui_step = 0.5;
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> = 4.0;
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uniform float Strength <
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ui_type = "slider";
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ui_label = "Strength";
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ui_tooltip = "Blend between the original image and the blurred one.";
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ui_min = 0.0; ui_max = 1.0; ui_step = 0.05;
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> = 1.0;
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uniform float FocusSize <
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ui_type = "slider";
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ui_label = "Sharp Centre";
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ui_tooltip = "Size of the region left in focus at the centre of the screen. At zero the whole image is blurred evenly.";
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ui_min = 0.0; ui_max = 1.0; ui_step = 0.05;
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> = 0.0;
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uniform float FocusSoftness <
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ui_type = "slider";
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ui_label = "Focus Falloff";
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ui_tooltip = "How gradually the sharp centre gives way to the blur.";
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ui_min = 0.05; ui_max = 1.0; ui_step = 0.05;
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> = 0.4;
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static const int TAPS = 17;
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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(float(id & 2), float((id & 1) << 1));
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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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float4 PS_Blur(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 original = tex2D(BackBuffer, uv).rgb;
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float2 centred = (uv - 0.5) * float2(BUFFER_WIDTH * BUFFER_RCP_HEIGHT, 1.0) * 2.0;
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float distance_from_centre = length(centred);
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float no_focus = 1.0 - step(0.001, FocusSize);
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float focus = max(smoothstep(FocusSize, FocusSize + FocusSoftness, distance_from_centre), no_focus);
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float amount = Strength * focus;
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float angle = frac(sin(dot(pos.xy, float2(12.9898, 78.233))) * 43758.5453) * 6.2831853;
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float2 spoke = float2(cos(angle), sin(angle));
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const float2 turn = float2(cos(2.39996323), sin(2.39996323));
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const float decay = exp(-2.0 / float(TAPS));
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float weight = exp(-1.0 / float(TAPS));
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float3 sum = float3(0.0, 0.0, 0.0);
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float total = 0.0;
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for (int i = 0; i < TAPS; ++i)
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{
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float reach = sqrt((float(i) + 0.5) / float(TAPS));
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sum += tex2D(BackBuffer, uv + spoke * reach * texel * Radius).rgb * weight;
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total += weight;
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weight *= decay;
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spoke = float2(spoke.x * turn.x - spoke.y * turn.y,
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spoke.x * turn.y + spoke.y * turn.x);
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}
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float3 blurred = sum / total;
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return float4(lerp(original, blurred, amount), 1.0);
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}
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technique Blur <
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ui_label = "Blur";
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ui_tooltip = "Gaussian blur with an optional sharp centre, for softening the picture or faking depth of field.";
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>
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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_Blur;
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}
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}
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