cccfa597ba
Taking advantage of the new decoupled main and shadow paths. For CPU we just store two nested structs in the integrator state, one for direct light shadows and one for AO. For the GPU we restrict the number of shade surface states to be executed based on available space in the shadow paths queue. This also helps improve performance in benchmark scenes with an AO pass, since it is no longer needed to use the shader raytracing kernel there, which has worse performance. Differential Revision: https://developer.blender.org/D12900
53 lines
1.4 KiB
C++
53 lines
1.4 KiB
C++
/*
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* Copyright 2021 Blender Foundation
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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CCL_NAMESPACE_BEGIN
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/* Parallel prefix sum.
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*
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* TODO: actually make this work in parallel.
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*
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* This is used for an array the size of the number of shaders in the scene
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* which is not usually huge, so might not be a significant bottleneck. */
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#include "util/util_atomic.h"
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#ifdef __HIP__
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# define GPU_PARALLEL_PREFIX_SUM_DEFAULT_BLOCK_SIZE 1024
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#else
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# define GPU_PARALLEL_PREFIX_SUM_DEFAULT_BLOCK_SIZE 512
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#endif
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template<uint blocksize>
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__device__ void gpu_parallel_prefix_sum(int *counter, int *prefix_sum, const int num_values)
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{
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if (!(ccl_gpu_block_idx_x == 0 && ccl_gpu_thread_idx_x == 0)) {
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return;
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}
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int offset = 0;
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for (int i = 0; i < num_values; i++) {
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const int new_offset = offset + counter[i];
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prefix_sum[i] = offset;
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counter[i] = 0;
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offset = new_offset;
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}
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}
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CCL_NAMESPACE_END
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