Turánszki János
60 lines
2.0 KiB
HLSL
60 lines
2.0 KiB
HLSL
#include "globals.hlsli"
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#include "ShaderInterop_Renderer.h"
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PUSHCONSTANT(push, VirtualTextureTileRequestsPush);
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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 >= push.width / 2 || DTid.y >= push.height / 2)
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return;
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Texture2D<uint> feedbackTexture = bindless_textures_uint[push.feedbackTextureRO];
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RWByteAddressBuffer requestBuffer = bindless_rwbuffers[push.requestBufferRW];
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uint page_count = 0;
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uint lod_offsets[10];
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for (uint i = 0; i < push.lodCount; ++i)
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{
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const uint l_width = max(1u, push.width >> i);
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const uint l_height = max(1u, push.height >> i);
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lod_offsets[i] = page_count;
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page_count += l_width * l_height;
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}
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const uint4 page_requests = uint4(
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feedbackTexture[DTid.xy * 2 + uint2(0, 0)],
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feedbackTexture[DTid.xy * 2 + uint2(1, 0)],
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feedbackTexture[DTid.xy * 2 + uint2(0, 1)],
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feedbackTexture[DTid.xy * 2 + uint2(1, 1)]
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);
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const uint x = DTid.x * 2;
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const uint y = DTid.y * 2;
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// LOD0 :
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// - No need for atomics here
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requestBuffer.Store(((x + 0) + (y + 0) * push.width) * sizeof(uint), page_requests.x);
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requestBuffer.Store(((x + 1) + (y + 0) * push.width) * sizeof(uint), page_requests.y);
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requestBuffer.Store(((x + 0) + (y + 1) * push.width) * sizeof(uint), page_requests.z);
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requestBuffer.Store(((x + 1) + (y + 1) * push.width) * sizeof(uint), page_requests.w);
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const uint page_request = min(page_requests.x, min(page_requests.y, min(page_requests.z, page_requests.w)));
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// LOD1 :
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// - No need for atomics here
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requestBuffer.Store((lod_offsets[1] + DTid.x + DTid.y * (push.width >> 1)) * sizeof(uint), page_request);
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// LOD2 -> LOD MAX:
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// - Need atomics
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for (uint lod = 2; lod < push.lodCount; ++lod)
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{
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const uint l_x = x >> lod;
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const uint l_y = y >> lod;
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const uint l_width = max(1u, push.width >> lod);
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const uint l_page_offset = lod_offsets[lod];
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const uint l_index = l_page_offset + l_x + l_y * l_width;
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requestBuffer.InterlockedMin(uint(l_index * sizeof(uint)), page_request);
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}
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}
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