diff options
Diffstat (limited to 'intern/cycles/kernel/split/kernel_do_volume.h')
| -rw-r--r-- | intern/cycles/kernel/split/kernel_do_volume.h | 95 |
1 files changed, 95 insertions, 0 deletions
diff --git a/intern/cycles/kernel/split/kernel_do_volume.h b/intern/cycles/kernel/split/kernel_do_volume.h new file mode 100644 index 00000000000..47d3c280831 --- /dev/null +++ b/intern/cycles/kernel/split/kernel_do_volume.h @@ -0,0 +1,95 @@ +/* + * Copyright 2011-2017 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. + */ + +CCL_NAMESPACE_BEGIN + + +ccl_device void kernel_do_volume(KernelGlobals *kg) +{ +#ifdef __VOLUME__ + /* We will empty this queue in this kernel. */ + if(ccl_global_id(0) == 0 && ccl_global_id(1) == 0) { + kernel_split_params.queue_index[QUEUE_ACTIVE_AND_REGENERATED_RAYS] = 0; + } + /* Fetch use_queues_flag. */ + char local_use_queues_flag = *kernel_split_params.use_queues_flag; + ccl_barrier(CCL_LOCAL_MEM_FENCE); + + int ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0); + if(local_use_queues_flag) { + ray_index = get_ray_index(kg, ray_index, + QUEUE_ACTIVE_AND_REGENERATED_RAYS, + kernel_split_state.queue_data, + kernel_split_params.queue_size, + 1); + if(ray_index == QUEUE_EMPTY_SLOT) { + return; + } + } + + if(IS_STATE(kernel_split_state.ray_state, ray_index, RAY_ACTIVE) || + IS_STATE(kernel_split_state.ray_state, ray_index, RAY_HIT_BACKGROUND)) { + + bool hit = ! IS_STATE(kernel_split_state.ray_state, ray_index, RAY_HIT_BACKGROUND); + + PathRadiance *L = &kernel_split_state.path_radiance[ray_index]; + ccl_global PathState *state = &kernel_split_state.path_state[ray_index]; + + ccl_global float3 *throughput = &kernel_split_state.throughput[ray_index]; + ccl_global Ray *ray = &kernel_split_state.ray[ray_index]; + RNG rng = kernel_split_state.rng[ray_index]; + ccl_global Intersection *isect = &kernel_split_state.isect[ray_index]; + ShaderData *sd = &kernel_split_state.sd[ray_index]; + ShaderData *sd_input = &kernel_split_state.sd_DL_shadow[ray_index]; + + /* Sanitize volume stack. */ + if(!hit) { + kernel_volume_clean_stack(kg, state->volume_stack); + } + /* volume attenuation, emission, scatter */ + if(state->volume_stack[0].shader != SHADER_NONE) { + Ray volume_ray = *ray; + volume_ray.t = (hit)? isect->t: FLT_MAX; + + bool heterogeneous = volume_stack_is_heterogeneous(kg, state->volume_stack); + + { + /* integrate along volume segment with distance sampling */ + VolumeIntegrateResult result = kernel_volume_integrate( + kg, state, sd, &volume_ray, L, throughput, &rng, heterogeneous); + +# ifdef __VOLUME_SCATTER__ + if(result == VOLUME_PATH_SCATTERED) { + /* direct lighting */ + kernel_path_volume_connect_light(kg, &rng, sd, sd_input, *throughput, state, L); + + /* indirect light bounce */ + if(kernel_path_volume_bounce(kg, &rng, sd, throughput, state, L, ray)) + ASSIGN_RAY_STATE(kernel_split_state.ray_state, ray_index, RAY_REGENERATED); + else + ASSIGN_RAY_STATE(kernel_split_state.ray_state, ray_index, RAY_UPDATE_BUFFER); + } +# endif + } + } + kernel_split_state.rng[ray_index] = rng; + } + +#endif +} + + +CCL_NAMESPACE_END |