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/* SPDX-License-Identifier: Apache-2.0
* Copyright 2021-2022 Blender Foundation */
#pragma once
CCL_NAMESPACE_BEGIN
/* Parallel prefix sum.
*
* TODO: actually make this work in parallel.
*
* This is used for an array the size of the number of shaders in the scene
* which is not usually huge, so might not be a significant bottleneck. */
#include "util/atomic.h"
#ifdef __HIP__
# define GPU_PARALLEL_PREFIX_SUM_DEFAULT_BLOCK_SIZE 1024
#else
# define GPU_PARALLEL_PREFIX_SUM_DEFAULT_BLOCK_SIZE 512
#endif
__device__ void gpu_parallel_prefix_sum(const int global_id,
ccl_global int *counter,
ccl_global int *prefix_sum,
const int num_values)
{
if (global_id != 0) {
return;
}
int offset = 0;
for (int i = 0; i < num_values; i++) {
const int new_offset = offset + counter[i];
prefix_sum[i] = offset;
counter[i] = 0;
offset = new_offset;
}
}
CCL_NAMESPACE_END
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