mirror of
https://git.eden-emu.dev/eden-emu/eden.git
synced 2026-09-08 13:11:02 +00:00
CamilleLaVey
89 lines
2.7 KiB
HLSL
89 lines
2.7 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 Length <
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ui_type = "slider";
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ui_label = "Length";
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ui_tooltip = "How far the streaks reach, as a percentage of screen height.";
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ui_min = 0.0; ui_max = 20.0; ui_step = 0.5;
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> = 5.0;
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uniform float Zoom <
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ui_type = "slider";
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ui_label = "Zoom";
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ui_tooltip = "Streaks running out from the centre of the screen, as if rushing forward. The centre stays sharp.";
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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 Pan <
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ui_type = "slider";
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ui_label = "Pan";
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ui_tooltip = "Streaks running in one fixed direction, as if the camera were sweeping across.";
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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 Angle <
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ui_type = "slider";
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ui_label = "Pan Angle";
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ui_tooltip = "Direction of the sweep, in degrees.";
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ui_min = 0.0; ui_max = 360.0; ui_step = 5.0;
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> = 0.0;
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uniform float Spin <
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ui_type = "slider";
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ui_label = "Spin";
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ui_tooltip = "Streaks curling around the centre, as if the camera were rolling. Negative turns the other way.";
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ui_min = -1.0; ui_max = 1.0; ui_step = 0.05;
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> = 0.0;
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static const int TAPS = 24;
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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_MotionBlur(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
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{
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float aspect = BUFFER_WIDTH * BUFFER_RCP_HEIGHT;
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float2 to_screen = float2(aspect, 1.0);
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float2 centred = (uv - 0.5) * to_screen * 2.0;
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float2 outward = centred;
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float2 around = float2(-centred.y, centred.x);
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float radians_angle = Angle * 0.01745329;
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float2 sweep = float2(cos(radians_angle), sin(radians_angle));
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float2 velocity = sweep * Pan + outward * Zoom + around * Spin;
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velocity *= Length * 0.01;
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velocity /= to_screen;
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float jitter = frac(sin(dot(pos.xy, float2(12.9898, 78.233))) * 43758.5453);
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float3 sum = float3(0.0, 0.0, 0.0);
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for (int i = 0; i < TAPS; ++i)
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{
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float t = (float(i) + jitter) / float(TAPS) - 0.5;
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sum += tex2D(BackBuffer, uv + velocity * t).rgb;
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}
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return float4(sum / float(TAPS), 1.0);
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}
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technique MotionBlur <
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ui_label = "Motion Blur";
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ui_tooltip = "Camera style motion blur: streaks the picture outwards, sideways or around, without touching still detail at the centre.";
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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_MotionBlur;
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}
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}
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