139 lines
16 KiB
Plaintext
139 lines
16 KiB
Plaintext
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BlockReducePart A<> BlockReducePart A<> BlockReducePart A<> BlockReducePart A<> block_reduce_part.compute <00>
/**********************************************************************
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Copyright (c) 2019 Advanced Micro Devices, Inc. All rights reserved.
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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********************************************************************/
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// WebGPU has extremely strict uniformity requirements that are incompatible with the current implementation of this shader.
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#pragma exclude_renderers webgpu
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uint g_constants_num_keys;
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uint g_constants_input_keys_offset;
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uint g_constants_part_sums_offset;
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uint g_constants_output_keys_offset;
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RWStructuredBuffer<int> g_buffer: register(u0);
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#define GROUP_SIZE 256u
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#define KEYS_PER_THREAD 4u
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groupshared int lds_keys[GROUP_SIZE];
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int BlockReduce(int key, uint lidx)
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{
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#ifndef USE_WAVE_INTRINSICS
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lds_keys[lidx] = key;
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GroupMemoryBarrierWithGroupSync();
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// Peform reduction within a block
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for (int stride = (GROUP_SIZE >> 1); stride > 0; stride >>= 1)
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{
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if (int(lidx) < stride)
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{
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lds_keys[lidx] += lds_keys[lidx + stride];
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}
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GroupMemoryBarrierWithGroupSync();
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}
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return lds_keys[0];
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#else
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lds_keys[lidx] = 0;
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GroupMemoryBarrierWithGroupSync();
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// Perform reduction within a subgroup
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int wave_reduced = WaveActiveSum(key);
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uint widx = lidx / WaveGetLaneCount();
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uint wlidx = WaveGetLaneIndex();
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// First element of each wave puts subgroup-reduced value into LDS
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if (wlidx == 0)
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{
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lds_keys[widx] = wave_reduced;
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}
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GroupMemoryBarrierWithGroupSync();
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// First subroup reduces partial sums
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if (widx == 0)
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{
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lds_keys[lidx] = WaveActiveSum(lds_keys[lidx]);
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}
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GroupMemoryBarrierWithGroupSync();
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return lds_keys[0];
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#endif
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}
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//[RootSignature(ROOT_SIGNATURE)]
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#pragma kernel BlockReducePart
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[numthreads(GROUP_SIZE, 1, 1)]
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void BlockReducePart(
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in uint gidx: SV_DispatchThreadID,
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in uint lidx: SV_GroupThreadID,
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in uint bidx: SV_GroupID)
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{
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int thread_sum = 0;
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// Do coalesced loads and calculate their partial sums right away
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uint range_begin = bidx * GROUP_SIZE * KEYS_PER_THREAD;
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for (uint i = 0; i < KEYS_PER_THREAD; ++i)
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{
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uint load_index = range_begin + i * GROUP_SIZE + lidx;
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thread_sum += (load_index < g_constants_num_keys) ? g_buffer[g_constants_input_keys_offset + load_index] : 0;
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}
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// Reduce sums
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thread_sum = BlockReduce(thread_sum, lidx);
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// First thread writes the sum to partial sums array
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if (lidx == 0)
|
|||
|
|
{
|
|||
|
|
g_buffer[g_constants_part_sums_offset + bidx] = thread_sum;
|
|||
|
|
}
|
|||
|
|
}
|
|||
|
|
w Packages/com.unity.render-pipelines.core/Runtime/UnifiedRayTracing/Compute/RadeonRays/kernels/block_reduce_part.compute BlockReducePart <00><><EFBFBD><EFBFBD> <09>k<EFBFBD>'#<23>Q<EFBFBD><51>e<EFBFBD>r<EFBFBD>
|