1 /*
2 * Copyright 2011-2017 Blender Foundation
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 CCL_NAMESPACE_BEGIN
18
kernel_indirect_subsurface(KernelGlobals * kg)19 ccl_device void kernel_indirect_subsurface(KernelGlobals *kg)
20 {
21 int thread_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0);
22 if (thread_index == 0) {
23 /* We will empty both queues in this kernel. */
24 kernel_split_params.queue_index[QUEUE_ACTIVE_AND_REGENERATED_RAYS] = 0;
25 kernel_split_params.queue_index[QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS] = 0;
26 }
27
28 int ray_index;
29 get_ray_index(kg,
30 thread_index,
31 QUEUE_ACTIVE_AND_REGENERATED_RAYS,
32 kernel_split_state.queue_data,
33 kernel_split_params.queue_size,
34 1);
35 ray_index = get_ray_index(kg,
36 thread_index,
37 QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS,
38 kernel_split_state.queue_data,
39 kernel_split_params.queue_size,
40 1);
41
42 #ifdef __SUBSURFACE__
43 if (ray_index == QUEUE_EMPTY_SLOT) {
44 return;
45 }
46
47 ccl_global char *ray_state = kernel_split_state.ray_state;
48 ccl_global PathState *state = &kernel_split_state.path_state[ray_index];
49 PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
50 ccl_global Ray *ray = &kernel_split_state.ray[ray_index];
51 ccl_global float3 *throughput = &kernel_split_state.throughput[ray_index];
52
53 if (IS_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER)) {
54 ccl_addr_space SubsurfaceIndirectRays *ss_indirect = &kernel_split_state.ss_rays[ray_index];
55
56 /* Trace indirect subsurface rays by restarting the loop. this uses less
57 * stack memory than invoking kernel_path_indirect.
58 */
59 if (ss_indirect->num_rays) {
60 kernel_path_subsurface_setup_indirect(kg, ss_indirect, state, ray, L, throughput);
61 ASSIGN_RAY_STATE(ray_state, ray_index, RAY_REGENERATED);
62 }
63 }
64 #endif /* __SUBSURFACE__ */
65 }
66
67 CCL_NAMESPACE_END
68