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#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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