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44 行
1.5 KiB
44 行
1.5 KiB
#include "Packages/com.unity.render-pipelines.core/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, _DepthMipChain);
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CBUFFER_START(cb)
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uint4 _SrcOffsetAndLimit; // {x, y, w - 1, h - 1}
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uint4 _DstOffset; // {x, y, 0, 0}
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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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uint2 srcOffset = _SrcOffsetAndLimit.xy;
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uint2 srcLimit = _SrcOffsetAndLimit.zw;
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uint2 dstOffset = _DstOffset.xy;
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// Upper-left pixel coordinate of quad that this thread will read
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uint2 srcPixelUL = srcOffset + (dispatchThreadId << 1);
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float p00 = _DepthMipChain[min(srcPixelUL + uint2(0u, 0u), srcLimit)];
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float p10 = _DepthMipChain[min(srcPixelUL + uint2(1u, 0u), srcLimit)];
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float p01 = _DepthMipChain[min(srcPixelUL + uint2(0u, 1u), srcLimit)];
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float p11 = _DepthMipChain[min(srcPixelUL + uint2(1u, 1u), srcLimit)];
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float4 depths = float4(p00, p10, p01, p11);
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// Select the closest 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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_DepthMipChain[dstOffset + dispatchThreadId] = minDepth;
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}
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#undef MIN_DEPTH
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