Bundle extra shaders ported from PPSSPP

2026-09-05 12:00:05 +00:00 · 2026-09-04 22:45:02 -04:00
parent 898da17e30
commit 81734e85b9
13 changed files with 594 additions and 59 deletions
@@ -0,0 +1,71 @@
+// SPDX-FileCopyrightText: Copyright 2026 Eden Emulator Project
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+// SPDX-FileCopyrightText: Copyright 2012 PPSSPP Project
+// SPDX-License-Identifier: GPL-2.0-or-later
+// Ported from scanlines.fsh in PPSSPP.
+
+
+texture BackBufferTex : COLOR;
+sampler BackBuffer { Texture = BackBufferTex; };
+
+uniform float Density <
+    ui_type = "slider";
+    ui_label = "Line Density";
+    ui_tooltip = "Number of scanline pairs across the screen.";
+    ui_min = 60.0; ui_max = 720.0; ui_step = 10.0;
+> = 340.0;
+
+uniform float Intensity <
+    ui_type = "slider";
+    ui_label = "Intensity";
+    ui_tooltip = "How dark the gaps between lines become.";
+    ui_min = 0.0; ui_max = 1.0; ui_step = 0.05;
+> = 0.5;
+
+uniform float Tint <
+    ui_type = "slider";
+    ui_label = "Phosphor Tint";
+    ui_tooltip = "Strength of the green-warm phosphor cast.";
+    ui_min = 0.0; ui_max = 1.0; ui_step = 0.05;
+> = 1.0;
+
+void VS_PostProcess(in uint id : SV_VertexID, out float4 pos : SV_Position, out float2 uv : TEXCOORD)
+{
+    uv = float2(0.0, 0.0);
+    if (id == 2)
+    {
+        uv.x = 2.0;
+    }
+    if (id == 1)
+    {
+        uv.y = 2.0;
+    }
+    pos = float4(uv * float2(2.0, -2.0) + float2(-1.0, 1.0), 0.0, 1.0);
+}
+
+float4 PS_Scanlines(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
+{
+    float line_pos = uv.y * Density * 0.5;
+    float gate = cos((frac(line_pos) - 0.5) * 3.1415926 * Intensity) * 1.5;
+
+    float3 rgb = tex2D(BackBuffer, uv).rgb;
+    float3 color = rgb * 0.5 + 0.5 * rgb * rgb * 1.2;
+
+    float3 phosphor = lerp(float3(1.0, 1.0, 1.0), float3(0.9, 1.0, 0.7), Tint);
+    color *= phosphor;
+
+    float2 diff = uv - 0.5;
+    color *= 1.1 - 0.6 * (dot(diff, diff) * 2.0);
+
+    return float4(saturate(color * saturate(gate)), 1.0);
+}
+
+technique Scanlines
+{
+    pass
+    {
+        VertexShader = VS_PostProcess;
+        PixelShader = PS_Scanlines;
+    }
+}