forked from bartvdbraak/blender
103 lines
3.7 KiB
C
103 lines
3.7 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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unsigned int my_sample;
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unsigned int pixel_x;
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unsigned int pixel_y;
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unsigned int tile_x;
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unsigned int tile_y;
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unsigned int work_index = 0;
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/* Get work. */
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if(!get_next_work(kg, &work_index, ray_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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/* Get the sample associated with the work. */
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my_sample = get_work_sample(kg, work_index, ray_index) + kernel_split_params.start_sample;
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/* Get pixel and tile position associated with the work. */
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get_work_pixel_tile_position(kg, &pixel_x, &pixel_y,
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&tile_x, &tile_y,
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work_index,
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ray_index);
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kernel_split_state.work_array[ray_index] = work_index;
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ccl_global uint *rng_state = kernel_split_params.rng_state;
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rng_state += kernel_split_params.offset + pixel_x + pixel_y*kernel_split_params.stride;
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ccl_global float *buffer = kernel_split_params.buffer;
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buffer += (kernel_split_params.offset + pixel_x + pixel_y * kernel_split_params.stride) * kernel_data.film.pass_stride;
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/* Initialize random numbers and ray. */
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kernel_path_trace_setup(kg,
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rng_state,
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my_sample,
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pixel_x, pixel_y,
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&kernel_split_state.rng[ray_index],
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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, L_transparent, 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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kernel_split_state.L_transparent[ray_index] = 0.0f;
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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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&kernel_split_state.rng[ray_index],
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my_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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#ifdef __KERNEL_DEBUG__
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debug_data_init(&kernel_split_state.debug_data[ray_index]);
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#endif
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}
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else {
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/* These rays do not participate in path-iteration. */
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float4 L_rad = make_float4(0.0f, 0.0f, 0.0f, 0.0f);
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/* Accumulate result in output buffer. */
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kernel_write_pass_float4(buffer, my_sample, L_rad);
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path_rng_end(kg, rng_state, kernel_split_state.rng[ray_index]);
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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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