Bundle extra shaders ported from PPSSPP

dist/post_shaders/Bloom.fx

@@ -0,0 +1,75 @@
+// 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 bloomnoblur.fsh in PPSSPP.
+
+texture BackBufferTex : COLOR;
+sampler BackBuffer { Texture = BackBufferTex; };
+
+uniform float Radius <
+    ui_type = "slider";
+    ui_label = "Radius";
+    ui_tooltip = "How far the glow spreads from bright areas.";
+    ui_min = 0.0; ui_max = 4.0; ui_step = 0.05;
+> = 1.0;
+
+uniform float Amount <
+    ui_type = "slider";
+    ui_label = "Amount";
+    ui_tooltip = "Strength of the glow added on top of the image.";
+    ui_min = 0.0; ui_max = 2.0; ui_step = 0.05;
+> = 0.6;
+
+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);
+}
+
+float Weight(float3 color)
+{
+    float gray = (color.r + color.g + color.b) / 3.0;
+    float saturation = (abs(color.r - gray) + abs(color.g - gray) + abs(color.b - gray)) / 3.0;
+    return gray * gray / max(saturation, 0.25);
+}
+
+float4 PS_Bloom(float4 pos : SV_Position, float2 uv : TEXCOORD) : SV_Target
+{
+    float3 color = tex2D(BackBuffer, uv).rgb;
+
+    float gray = (color.r + color.g + color.b) / 3.0;
+    float saturation = (abs(color.r - gray) + abs(color.g - gray) + abs(color.b - gray)) / 3.0;
+    float spread = 0.002 * gray / max(saturation, 0.25) * Radius;
+
+    float3 sum = float3(0.0, 0.0, 0.0);
+    for (int x = -3; x <= 3; x += 2)
+    {
+        for (int y = -3; y <= 3; y += 2)
+        {
+            float3 tap = tex2D(BackBuffer, uv + float2(x, y) * spread).rgb;
+            sum += tap * Weight(tap);
+        }
+    }
+    sum /= 16.0;
+
+    return float4(saturate(color + sum * Amount), 1.0);
+}
+
+technique Bloom
+{
+    pass
+    {
+        VertexShader = VS_PostProcess;
+        PixelShader = PS_Bloom;
+    }
+}