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/*
* Copyright 2011-2015 Blender Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
CCL_NAMESPACE_BEGIN
/*
* Utility functions for work stealing
*/
/* Map global work index to tile, pixel X/Y and sample. */
ccl_device_inline void get_work_pixel(ccl_global const KernelWorkTile *tile,
uint global_work_index,
ccl_private uint *x,
ccl_private uint *y,
ccl_private uint *sample)
{
#if 0
/* Keep threads for the same sample together. */
uint tile_pixels = tile->w * tile->h;
uint sample_offset = global_work_index / tile_pixels;
uint pixel_offset = global_work_index - sample_offset * tile_pixels;
#else
/* Keeping threads for the same pixel together.
* Appears to improve performance by a few % on CUDA and OptiX. */
uint sample_offset = global_work_index % tile->num_samples;
uint pixel_offset = global_work_index / tile->num_samples;
#endif
uint y_offset = pixel_offset / tile->w;
uint x_offset = pixel_offset - y_offset * tile->w;
*x = tile->x + x_offset;
*y = tile->y + y_offset;
*sample = tile->start_sample + sample_offset;
}
CCL_NAMESPACE_END
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