157 lines
6.7 KiB
Plaintext
157 lines
6.7 KiB
Plaintext
// Each #kernel tells which function to compile; you can have many kernels
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#pragma kernel CSMainMipmapGroup0
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#pragma kernel CSMainMipmapGroup0 _INPUTE_DEPTH_TEXTURE
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#pragma kernel CSMainMipmapGroup0 _INPUTE_DEPTH_TEXTURE _SKIP_3_MIP
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#pragma enable_d3d11_debug_symbols
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#pragma target 5.0
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Texture2D<float> _InputDepth;
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RWTexture2D<float> _DepthMipChain;
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#include "Packages/com.unity.render-pipelines.core/ShaderLibrary/Common.hlsl"
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#if UNITY_REVERSED_Z
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# define MIN_DEPTH(l, r) min(l, r)
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#else
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# define MIN_DEPTH(l, r) max(l, r)
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#endif
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#define GROUP_TILE_SIZE 8
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float4x4 _MipOffsetAndSizeArray;
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float4 _InputMipOffsetAndSize;
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float _MipCount;
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groupshared float _LDSDepths[GROUP_TILE_SIZE * GROUP_TILE_SIZE];
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[numthreads(GROUP_TILE_SIZE, GROUP_TILE_SIZE, 1)]
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void CSMainMipmapGroup0(uint3 dispatchThreadId : SV_DispatchThreadID, uint groupThreadIndex : SV_GroupIndex, uint2 groupId : SV_GroupID, uint3 groupThreadID : SV_GroupThreadID)
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{
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uint2 curMipSize = _MipOffsetAndSizeArray[0].zw;
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if (all(dispatchThreadId.xy < curMipSize.xy))
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{
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//Mip0从InputeTexture贴图下采样
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float2 uv = dispatchThreadId.xy / float2(curMipSize);
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uv = clamp(uv, 0, 1);
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int3 texCrood = int3(_InputMipOffsetAndSize.xy + uv * (_InputMipOffsetAndSize.zw), 0);
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uint2 maxIndex = int3(_InputMipOffsetAndSize.xy + _InputMipOffsetAndSize.zw - 1,0);
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#ifdef _INPUTE_DEPTH_TEXTURE //第一次Dispath使用Depth Texture
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float p00 = _InputDepth[min(texCrood + uint3(0, 0, 0), maxIndex)];
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float p01 = _InputDepth[min(texCrood + uint3(1, 0, 0), maxIndex)];
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float p10 = _InputDepth[min(texCrood + uint3(0, 1, 0), maxIndex)];
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float p11 = _InputDepth[min(texCrood + uint3(1, 1, 0), maxIndex)];
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#else
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float p00 = _DepthMipChain[min(texCrood + uint3(0, 0, 0), maxIndex)];
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float p01 = _DepthMipChain[min(texCrood + uint3(1, 0, 0), maxIndex)];
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float p10 = _DepthMipChain[min(texCrood + uint3(0, 1, 0), maxIndex)];
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float p11 = _DepthMipChain[min(texCrood + uint3(1, 1, 0), maxIndex)];
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#endif
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float4 depths = float4(p00, p10, p01, p11);
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float minDepth = MIN_DEPTH(MIN_DEPTH(depths.x, depths.y), MIN_DEPTH(depths.z, depths.w));
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#ifndef _SKIP_3_MIP //跳过前3级,不输出到RT
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_DepthMipChain[_MipOffsetAndSizeArray[0].xy + dispatchThreadId.xy] = minDepth;
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#endif
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_LDSDepths[groupThreadIndex] = minDepth;
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}
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GroupMemoryBarrierWithGroupSync();
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//Mip1
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curMipSize = curMipSize >> 1;
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uint preMipTileSize = GROUP_TILE_SIZE;
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uint TileSize = GROUP_TILE_SIZE / 2; //线程数减半
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float4 parentFurthestDeviceZ;
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uint2 xy = min(groupThreadID.xy, TileSize - 1);
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uint2 xy2 = xy * 2; //间隔索引:[0,2,4,6]
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uint index0 = xy2.x + xy2.y * preMipTileSize;
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uint index1 = (xy2.x + 1) + xy2.y * preMipTileSize;
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uint index2 = xy2.x + (xy2.y + 1) * preMipTileSize;
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uint index3 = (xy2.x + 1) + (xy2.y + 1) * preMipTileSize;
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parentFurthestDeviceZ.x = _LDSDepths[index0];
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parentFurthestDeviceZ.y = _LDSDepths[index1];
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parentFurthestDeviceZ.z = _LDSDepths[index2];
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parentFurthestDeviceZ.w = _LDSDepths[index3];
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float furthestDeviceZ = MIN_DEPTH(MIN_DEPTH(parentFurthestDeviceZ.x, parentFurthestDeviceZ.y), MIN_DEPTH(parentFurthestDeviceZ.z, parentFurthestDeviceZ.w));
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uint2 localIndex = dispatchThreadId.xy - (groupId.xy * (GROUP_TILE_SIZE - TileSize)); //因为过滤了3/4的线程组,所以线程索引需要往前补上
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if (all(localIndex < curMipSize.xy) //索引在贴图范围内的
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&& all(groupThreadID.xy < TileSize) //每次每个线程组保留1/4的线程
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)
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{
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#ifndef _SKIP_3_MIP //跳过前3级,不输出到RT
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_DepthMipChain[_MipOffsetAndSizeArray[1].xy + localIndex] = furthestDeviceZ;
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#endif
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int threadIndex = xy.x + xy.y * TileSize;
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_LDSDepths[threadIndex] = furthestDeviceZ;
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}
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else
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{
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int threadIndex = xy.x + xy.y * TileSize;
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_LDSDepths[threadIndex] = 0;
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}
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//Mip2
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GroupMemoryBarrierWithGroupSync();
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curMipSize = curMipSize >> 1;
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preMipTileSize = TileSize;
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TileSize = TileSize / 2; //线程数减半
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xy = min(groupThreadID.xy, TileSize - 1);
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xy2 = xy * 2; //间隔索引:[0,2,4,6]
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index0 = xy2.x + xy2.y * preMipTileSize;
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index1 = (xy2.x + 1) + xy2.y * preMipTileSize;
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index2 = xy2.x + (xy2.y + 1) * preMipTileSize;
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index3 = (xy2.x + 1) + (xy2.y + 1) * preMipTileSize;
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parentFurthestDeviceZ.x = _LDSDepths[index0];
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parentFurthestDeviceZ.y = _LDSDepths[index1];
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parentFurthestDeviceZ.z = _LDSDepths[index2];
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parentFurthestDeviceZ.w = _LDSDepths[index3];
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GroupMemoryBarrierWithGroupSync();
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furthestDeviceZ = MIN_DEPTH(MIN_DEPTH(parentFurthestDeviceZ.x, parentFurthestDeviceZ.y), MIN_DEPTH(parentFurthestDeviceZ.z, parentFurthestDeviceZ.w));
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localIndex = dispatchThreadId.xy - (groupId.xy * (GROUP_TILE_SIZE - TileSize)); //因为过滤了3/4的线程组,所以线程索引需要往前补上
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if (all(localIndex < curMipSize.xy) //索引在贴图范围内的
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&& all(groupThreadID.xy < TileSize) //每次每个线程组保留1/4的线程
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)
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{
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#ifndef _SKIP_3_MIP //跳过前3级,不输出到RT
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_DepthMipChain[_MipOffsetAndSizeArray[2].xy + localIndex] = furthestDeviceZ;
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#endif
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int threadIndex = xy.x + xy.y * TileSize;
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_LDSDepths[threadIndex] = furthestDeviceZ;
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}
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else
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{
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int threadIndex = xy.x + xy.y * TileSize;
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_LDSDepths[threadIndex] = 0;
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}
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//Mip3
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GroupMemoryBarrierWithGroupSync();
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curMipSize = curMipSize >> 1;
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preMipTileSize = TileSize;
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TileSize = TileSize / 2; //线程数减半
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xy = min(groupThreadID.xy, TileSize - 1);
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xy2 = xy * 2; //间隔索引:[0,2,4,6]
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index0 = xy2.x + xy2.y * preMipTileSize;
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index1 = (xy2.x + 1) + xy2.y * preMipTileSize;
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index2 = xy2.x + (xy2.y + 1) * preMipTileSize;
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index3 = (xy2.x + 1) + (xy2.y + 1) * preMipTileSize;
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parentFurthestDeviceZ.x = _LDSDepths[index0];
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parentFurthestDeviceZ.y = _LDSDepths[index1];
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parentFurthestDeviceZ.z = _LDSDepths[index2];
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parentFurthestDeviceZ.w = _LDSDepths[index3];
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// GroupMemoryBarrierWithGroupSync();
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furthestDeviceZ = MIN_DEPTH(MIN_DEPTH(parentFurthestDeviceZ.x, parentFurthestDeviceZ.y), MIN_DEPTH(parentFurthestDeviceZ.z, parentFurthestDeviceZ.w));
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localIndex = dispatchThreadId.xy - (groupId.xy * (GROUP_TILE_SIZE - TileSize)); //因为过滤了3/4的线程组,所以线程索引需要往前补上
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if (all(localIndex < curMipSize.xy) //索引在贴图范围内的
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&& all(groupThreadID.xy < TileSize) //每次每个线程组保留1/4的线程
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)
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{
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_DepthMipChain[_MipOffsetAndSizeArray[3].xy + localIndex] = furthestDeviceZ;
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}
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} |