From 5a079a2d114f96d4847d1ee305d5b7c16eeec50e Mon Sep 17 00:00:00 2001
From: 3gg <3gg@shellblade.net>
Date: Sat, 27 Dec 2025 12:03:39 -0800
Subject: Initial commit

---
 contrib/SDL-3.2.8/src/gpu/d3d12/D3D_Blit.hlsl | 97 +++++++++++++++++++++++++++
 1 file changed, 97 insertions(+)
 create mode 100644 contrib/SDL-3.2.8/src/gpu/d3d12/D3D_Blit.hlsl

(limited to 'contrib/SDL-3.2.8/src/gpu/d3d12/D3D_Blit.hlsl')

diff --git a/contrib/SDL-3.2.8/src/gpu/d3d12/D3D_Blit.hlsl b/contrib/SDL-3.2.8/src/gpu/d3d12/D3D_Blit.hlsl
new file mode 100644
index 0000000..69748d4
--- /dev/null
+++ b/contrib/SDL-3.2.8/src/gpu/d3d12/D3D_Blit.hlsl
@@ -0,0 +1,97 @@
+#define BlitRS \
+    "DescriptorTable ( Sampler(s0, space=2), visibility = SHADER_VISIBILITY_PIXEL ),"\
+    "DescriptorTable ( SRV(t0, space=2), visibility = SHADER_VISIBILITY_PIXEL ),"\
+    "CBV(b0, space=3, visibility = SHADER_VISIBILITY_PIXEL),"\
+
+struct VertexToPixel
+{
+    float2 tex : TEXCOORD0;
+    float4 pos : SV_POSITION;
+};
+
+cbuffer SourceRegionBuffer : register(b0, space3)
+{
+    float2 UVLeftTop;
+    float2 UVDimensions;
+    uint MipLevel;
+    float LayerOrDepth;
+};
+
+Texture2D SourceTexture2D : register(t0, space2);
+Texture2DArray SourceTexture2DArray : register(t0, space2);
+Texture3D SourceTexture3D : register(t0, space2);
+TextureCube SourceTextureCube : register(t0, space2);
+TextureCubeArray SourceTextureCubeArray : register(t0, space2);
+sampler SourceSampler : register(s0, space2);
+
+[RootSignature(BlitRS)]
+VertexToPixel FullscreenVert(uint vI : SV_VERTEXID)
+{
+    float2 inTex = float2((vI << 1) & 2, vI & 2);
+    VertexToPixel Out = (VertexToPixel)0;
+    Out.tex = inTex;
+    Out.pos = float4(inTex * float2(2.0f, -2.0f) + float2(-1.0f, 1.0f), 0.0f, 1.0f);
+    return Out;
+}
+
+[RootSignature(BlitRS)]
+float4 BlitFrom2D(VertexToPixel input) : SV_Target0
+{
+    float2 newCoord = UVLeftTop + UVDimensions * input.tex;
+    return SourceTexture2D.SampleLevel(SourceSampler, newCoord, MipLevel);
+}
+
+[RootSignature(BlitRS)]
+float4 BlitFrom2DArray(VertexToPixel input) : SV_Target0
+{
+    float3 newCoord = float3(UVLeftTop + UVDimensions * input.tex, (uint)LayerOrDepth);
+    return SourceTexture2DArray.SampleLevel(SourceSampler, newCoord, MipLevel);
+}
+
+[RootSignature(BlitRS)]
+float4 BlitFrom3D(VertexToPixel input) : SV_Target0
+{
+    float3 newCoord = float3(UVLeftTop + UVDimensions * input.tex, LayerOrDepth);
+    return SourceTexture3D.SampleLevel(SourceSampler, newCoord, MipLevel);
+}
+
+[RootSignature(BlitRS)]
+float4 BlitFromCube(VertexToPixel input) : SV_Target0
+{
+    // Thanks, Wikipedia! https://en.wikipedia.org/wiki/Cube_mapping
+    float3 newCoord;
+    float2 scaledUV = UVLeftTop + UVDimensions * input.tex;
+    float u = 2.0 * scaledUV.x - 1.0;
+    float v = 2.0 * scaledUV.y - 1.0;
+    switch ((uint)LayerOrDepth) {
+        case 0: newCoord = float3(1.0, -v, -u); break; // POSITIVE X
+        case 1: newCoord = float3(-1.0, -v, u); break; // NEGATIVE X
+        case 2: newCoord = float3(u, 1.0, -v); break; // POSITIVE Y
+        case 3: newCoord = float3(u, -1.0, v); break; // NEGATIVE Y
+        case 4: newCoord = float3(u, -v, 1.0); break; // POSITIVE Z
+        case 5: newCoord = float3(-u, -v, -1.0); break; // NEGATIVE Z
+        default: newCoord = float3(0, 0, 0); break; // silences warning
+    }
+    return SourceTextureCube.SampleLevel(SourceSampler, newCoord, MipLevel);
+}
+
+[RootSignature(BlitRS)]
+float4 BlitFromCubeArray(VertexToPixel input) : SV_Target0
+{
+    // Thanks, Wikipedia! https://en.wikipedia.org/wiki/Cube_mapping
+    float3 newCoord;
+    float2 scaledUV = UVLeftTop + UVDimensions * input.tex;
+    float u = 2.0 * scaledUV.x - 1.0;
+    float v = 2.0 * scaledUV.y - 1.0;
+    uint ArrayIndex = (uint)LayerOrDepth / 6;
+    switch ((uint)LayerOrDepth % 6) {
+        case 0: newCoord = float3(1.0, -v, -u); break; // POSITIVE X
+        case 1: newCoord = float3(-1.0, -v, u); break; // NEGATIVE X
+        case 2: newCoord = float3(u, 1.0, -v); break; // POSITIVE Y
+        case 3: newCoord = float3(u, -1.0, v); break; // NEGATIVE Y
+        case 4: newCoord = float3(u, -v, 1.0); break; // POSITIVE Z
+        case 5: newCoord = float3(-u, -v, -1.0); break; // NEGATIVE Z
+        default: newCoord = float3(0, 0, 0); break; // silences warning
+    }
+    return SourceTextureCubeArray.SampleLevel(SourceSampler, float4(newCoord, float(ArrayIndex)), MipLevel);
+}
-- 
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