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44 行
1.5 KiB
44 行
1.5 KiB
#include "CoreRP/ShaderLibrary/Common.hlsl"
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#pragma only_renderers d3d11 ps4 xboxone vulkan metal switch
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#pragma kernel KDepthDownsample8DualUav KERNEL_SIZE=8 KERNEL_NAME=KDepthDownsample8DualUav
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RW_TEXTURE2D(float, _Destination);
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RW_TEXTURE2D(float, _Source);
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CBUFFER_START(cb)
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float4 _Size; // x: src width, y: src height, zw: unused
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CBUFFER_END
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#if UNITY_REVERSED_Z
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# define MIN_DEPTH(l, r) max(l, r)
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#else
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# define MIN_DEPTH(l, r) min(l, r)
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#endif
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// Downsample a depth texture by taking the min value of sampled pixels
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// The size of the dispatch is (DstMipSize / KernelSize).
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[numthreads(KERNEL_SIZE, KERNEL_SIZE, 1)]
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void KERNEL_NAME(uint2 dispatchThreadId : SV_DispatchThreadID)
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{
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// Upper-left pixel coordinate of quad that this thread will read
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uint2 srcPixelUL = dispatchThreadId << 1;
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// '_Source' and '_Destination' are two different MIP levels of the same texture.
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// TODO: Use Gather here instead of 4 loads
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uint2 size = uint2(_Size.xy) - 1u;
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float p00 = _Source[min(srcPixelUL + uint2(0u, 0u), size)];
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float p10 = _Source[min(srcPixelUL + uint2(1u, 0u), size)];
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float p01 = _Source[min(srcPixelUL + uint2(0u, 1u), size)];
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float p11 = _Source[min(srcPixelUL + uint2(1u, 1u), size)];
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float4 depths = float4(p00, p10, p01, p11);
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// Select the nearest sample
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float minDepth = MIN_DEPTH(MIN_DEPTH(depths.x, depths.y), MIN_DEPTH(depths.z, depths.w));
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// Write to the final target
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_Destination[dispatchThreadId] = minDepth;
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}
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#undef MIN_DEPTH
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