Turánszki János
85 lines
2.5 KiB
HLSL
85 lines
2.5 KiB
HLSL
#include "globals.hlsli"
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#include "ShaderInterop_Renderer.h"
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ConstantBuffer<VirtualTextureResidencyUpdateCB> cb : register(b0);
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[numthreads(8, 8, 1)]
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void main(uint3 DTid : SV_DispatchThreadID, uint groupIndex : SV_GroupIndex)
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{
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if (DTid.x >= cb.width || DTid.y >= cb.height)
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return;
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Buffer<uint> pageBuffer = bindless_buffers_uint[descriptor_index(cb.pageBufferRO)];
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uint minLod = 0xFF;
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uint tile_x = 0;
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uint tile_y = 0;
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uint lod_offset = 0;
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uint lod_pages[10];
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uint lod = 0;
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for (lod = 0; lod < cb.lodCount; ++lod)
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{
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const uint l_x = DTid.x >> lod;
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const uint l_y = DTid.y >> lod;
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const uint l_width = max(1u, cb.width >> lod);
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const uint l_height = max(1u, cb.height >> lod);
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const uint l_page_offset = lod_offset;
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const uint l_index = l_page_offset + l_x + l_y * l_width;
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const uint page = pageBuffer[l_index];
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lod_pages[lod] = page;
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if (page == 0xFFFF)
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{
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// invalid page
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// normally this wouldn't happen after a resident mip was encountered, but
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// it can happen on allocation failures, in this case reset the residency to invalid
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// this will mean that while there was a higher res resident page, but we can't use that because lower levels might be non resident
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minLod = 0xFF;
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}
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else if(lod < minLod)
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{
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// valid page
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// normally this would be the highest lod and we could exit, but failed allocations can cause holes in the mip chain
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minLod = lod;
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tile_x = page & 0xFF;
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tile_y = (page >> 8u) & 0xFF;
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}
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lod_offset += l_width * l_height;
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}
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// Update the mip chain:
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for (lod = 0; lod < cb.lodCount; ++lod)
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{
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uint lod_check = 1u << lod;
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if ((DTid.x % lod_check == 0) && (DTid.y % lod_check == 0))
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{
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uint page = lod_pages[lod];
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uint2 write_coord = DTid.xy >> lod;
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const bool packed_mips = lod == cb.lodCount - 1;
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if (packed_mips)
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{
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RWTexture2D<uint4> residencyTexture = bindless_rwtextures_uint4[descriptor_index(cb.residencyTextureRW_mips[lod - 1].x)];
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uint x = page & 0xFF;
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uint y = (page >> 8u) & 0xFF;
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residencyTexture[write_coord] = uint4(residencyTexture[write_coord].xy, x, y);
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}
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else
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{
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RWTexture2D<uint4> residencyTexture = bindless_rwtextures_uint4[descriptor_index(cb.residencyTextureRW_mips[lod].x)];
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if (lod < minLod || page == 0xFFFF)
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{
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residencyTexture[write_coord] = uint4(tile_x, tile_y, minLod, 0);
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}
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else
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{
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uint x = page & 0xFF;
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uint y = (page >> 8u) & 0xFF;
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residencyTexture[write_coord] = uint4(x, y, lod, 0);
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}
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}
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}
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}
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}
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