5bb677e592
This was originally done with the first sample in the kernel for better performance, but it doesn't work anymore with atomics. Any benefit was very minor anyway, too small to measure it seems.
82 lines
2.8 KiB
C
82 lines
2.8 KiB
C
/*
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* Copyright 2011-2017 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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CCL_NAMESPACE_BEGIN
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/* This kernel initializes structures needed in path-iteration kernels.
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* This is the first kernel in ray-tracing logic.
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*
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* Ray state of rays outside the tile-boundary will be marked RAY_INACTIVE
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*/
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ccl_device void kernel_path_init(KernelGlobals *kg) {
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int ray_index = ccl_global_id(0) + ccl_global_id(1) * ccl_global_size(0);
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/* This is the first assignment to ray_state;
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* So we dont use ASSIGN_RAY_STATE macro.
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*/
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kernel_split_state.ray_state[ray_index] = RAY_ACTIVE;
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/* Get work. */
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ccl_global uint *work_pools = kernel_split_params.work_pools;
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uint total_work_size = kernel_split_params.total_work_size;
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uint work_index;
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if(!get_next_work(kg, work_pools, total_work_size, ray_index, &work_index)) {
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/* No more work, mark ray as inactive */
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kernel_split_state.ray_state[ray_index] = RAY_INACTIVE;
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return;
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}
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ccl_global WorkTile *tile = &kernel_split_params.tile;
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uint x, y, sample;
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get_work_pixel(tile, work_index, &x, &y, &sample);
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/* Store buffer offset for writing to passes. */
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uint buffer_offset = (tile->offset + x + y*tile->stride) * kernel_data.film.pass_stride;
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kernel_split_state.buffer_offset[ray_index] = buffer_offset;
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/* Initialize random numbers and ray. */
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uint rng_hash;
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kernel_path_trace_setup(kg,
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sample,
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x, y,
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&rng_hash,
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&kernel_split_state.ray[ray_index]);
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if(kernel_split_state.ray[ray_index].t != 0.0f) {
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/* Initialize throughput, path radiance, Ray, PathState;
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* These rays proceed with path-iteration.
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*/
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kernel_split_state.throughput[ray_index] = make_float3(1.0f, 1.0f, 1.0f);
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path_radiance_init(&kernel_split_state.path_radiance[ray_index], kernel_data.film.use_light_pass);
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path_state_init(kg,
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&kernel_split_state.sd_DL_shadow[ray_index],
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&kernel_split_state.path_state[ray_index],
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rng_hash,
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sample,
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&kernel_split_state.ray[ray_index]);
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#ifdef __SUBSURFACE__
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kernel_path_subsurface_init_indirect(&kernel_split_state.ss_rays[ray_index]);
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#endif
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}
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else {
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ASSIGN_RAY_STATE(kernel_split_state.ray_state, ray_index, RAY_TO_REGENERATE);
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}
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}
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CCL_NAMESPACE_END
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