Bundle extra shaders ported from PPSSPP

2026-09-05 20:04:13 +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 +1,65 @@
+// 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 naturalA.fsh in PPSSPP, by ShadX, modified by SimoneT.
+
+texture BackBufferTex : COLOR;
+sampler BackBuffer { Texture = BackBufferTex; };
+
+uniform float Luma <
+    ui_type = "slider";
+    ui_label = "Luma Curve";
+    ui_tooltip = "Gamma applied to the luminance channel in YIQ space.";
+    ui_min = 0.5; ui_max = 2.0; ui_step = 0.01;
+> = 1.2;
+
+uniform float Chroma <
+    ui_type = "slider";
+    ui_label = "Chroma Gain";
+    ui_tooltip = "Boost applied to the two colour difference channels.";
+    ui_min = 0.0; ui_max = 2.0; ui_step = 0.01;
+> = 1.2;
+
+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_Natural(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
+{
+    const float3x3 RGBtoYIQ = float3x3(0.299, 0.587, 0.114,
+                                       0.596, -0.275, -0.321,
+                                       0.212, -0.523, 0.311);
+
+    const float3x3 YIQtoRGB = float3x3(1.0, 0.95568806, 0.61985809,
+                                       1.0, -0.27158180, -0.64687382,
+                                       1.0, -1.10817733, 1.70506456);
+
+    float3 rgb = tex2D(BackBuffer, uv).rgb;
+    float3 yiq = mul(RGBtoYIQ, rgb);
+
+    yiq.x = pow(max(yiq.x, 0.0), Luma);
+    yiq.yz *= Chroma;
+
+    return float4(saturate(mul(YIQtoRGB, yiq)), 1.0);
+}
+
+technique NaturalColors
+{
+    pass
+    {
+        VertexShader = VS_PostProcess;
+        PixelShader = PS_Natural;
+    }
+}