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Diffstat (limited to 'intern/cycles/kernel/split/kernel_buffer_update.h')
| -rw-r--r-- | intern/cycles/kernel/split/kernel_buffer_update.h | 206 |
1 files changed, 206 insertions, 0 deletions
diff --git a/intern/cycles/kernel/split/kernel_buffer_update.h b/intern/cycles/kernel/split/kernel_buffer_update.h new file mode 100644 index 00000000000..859c221d976 --- /dev/null +++ b/intern/cycles/kernel/split/kernel_buffer_update.h @@ -0,0 +1,206 @@ +/* + * 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. + */ + +CCL_NAMESPACE_BEGIN + +/* This kernel takes care of rays that hit the background (sceneintersect + * kernel), and for the rays of state RAY_UPDATE_BUFFER it updates the ray's + * accumulated radiance in the output buffer. This kernel also takes care of + * rays that have been determined to-be-regenerated. + * + * We will empty QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue in this kernel. + * + * Typically all rays that are in state RAY_HIT_BACKGROUND, RAY_UPDATE_BUFFER + * will be eventually set to RAY_TO_REGENERATE state in this kernel. + * Finally all rays of ray_state RAY_TO_REGENERATE will be regenerated and put + * in queue QUEUE_ACTIVE_AND_REGENERATED_RAYS. + * + * State of queues when this kernel is called: + * At entry, + * - QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE rays. + * - QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be filled with + * RAY_UPDATE_BUFFER, RAY_HIT_BACKGROUND, RAY_TO_REGENERATE rays. + * At exit, + * - QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE and + * RAY_REGENERATED rays. + * - QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be empty. + */ +ccl_device void kernel_buffer_update(KernelGlobals *kg, + ccl_local_param unsigned int *local_queue_atomics) +{ + if(ccl_local_id(0) == 0 && ccl_local_id(1) == 0) { + *local_queue_atomics = 0; + } + ccl_barrier(CCL_LOCAL_MEM_FENCE); + + int ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0); + if(ray_index == 0) { + /* We will empty this queue in this kernel. */ + kernel_split_params.queue_index[QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS] = 0; + } + char enqueue_flag = 0; + ray_index = get_ray_index(kg, ray_index, + QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS, + kernel_split_state.queue_data, + kernel_split_params.queue_size, + 1); + +#ifdef __COMPUTE_DEVICE_GPU__ + /* If we are executing on a GPU device, we exit all threads that are not + * required. + * + * If we are executing on a CPU device, then we need to keep all threads + * active since we have barrier() calls later in the kernel. CPU devices, + * expect all threads to execute barrier statement. + */ + if(ray_index == QUEUE_EMPTY_SLOT) { + return; + } +#endif + +#ifndef __COMPUTE_DEVICE_GPU__ + if(ray_index != QUEUE_EMPTY_SLOT) { +#endif + + ccl_global uint *rng_state = kernel_split_params.rng_state; + int stride = kernel_split_params.stride; + + ccl_global char *ray_state = kernel_split_state.ray_state; +#ifdef __KERNEL_DEBUG__ + DebugData *debug_data = &kernel_split_state.debug_data[ray_index]; +#endif + ccl_global PathState *state = &kernel_split_state.path_state[ray_index]; + PathRadiance *L = &kernel_split_state.path_radiance[ray_index]; + ccl_global Ray *ray = &kernel_split_state.ray[ray_index]; + ccl_global float3 *throughput = &kernel_split_state.throughput[ray_index]; + ccl_global float *L_transparent = &kernel_split_state.L_transparent[ray_index]; + RNG rng = kernel_split_state.rng[ray_index]; + ccl_global float *buffer = kernel_split_params.buffer; + + unsigned int work_index; + ccl_global uint *initial_rng; + + unsigned int sample; + unsigned int tile_x; + unsigned int tile_y; + unsigned int pixel_x; + unsigned int pixel_y; + + work_index = kernel_split_state.work_array[ray_index]; + sample = get_work_sample(kg, work_index, ray_index) + kernel_split_params.start_sample; + get_work_pixel_tile_position(kg, &pixel_x, &pixel_y, + &tile_x, &tile_y, + work_index, + ray_index); + initial_rng = rng_state; + + rng_state += kernel_split_params.offset + pixel_x + pixel_y*stride; + buffer += (kernel_split_params.offset + pixel_x + pixel_y*stride) * kernel_data.film.pass_stride; + + if(IS_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER)) { + float3 L_sum; +#ifdef __SHADOW_TRICKS__ + if(state->flag & PATH_RAY_SHADOW_CATCHER) { + L_sum = path_radiance_sum_shadowcatcher(kg, L, L_transparent); + } + else +#endif /* __SHADOW_TRICKS__ */ + { + L_sum = path_radiance_clamp_and_sum(kg, L); + } + kernel_write_light_passes(kg, buffer, L, sample); +#ifdef __KERNEL_DEBUG__ + kernel_write_debug_passes(kg, buffer, state, debug_data, sample); +#endif + float4 L_rad = make_float4(L_sum.x, L_sum.y, L_sum.z, 1.0f - (*L_transparent)); + + /* accumulate result in output buffer */ + kernel_write_pass_float4(buffer, sample, L_rad); + path_rng_end(kg, rng_state, rng); + + ASSIGN_RAY_STATE(ray_state, ray_index, RAY_TO_REGENERATE); + } + + if(IS_STATE(ray_state, ray_index, RAY_TO_REGENERATE)) { + /* We have completed current work; So get next work */ + int valid_work = get_next_work(kg, &work_index, ray_index); + if(!valid_work) { + /* If work is invalid, this means no more work is available and the thread may exit */ + ASSIGN_RAY_STATE(ray_state, ray_index, RAY_INACTIVE); + } + + if(IS_STATE(ray_state, ray_index, RAY_TO_REGENERATE)) { + kernel_split_state.work_array[ray_index] = work_index; + /* Get the sample associated with the current work */ + sample = get_work_sample(kg, work_index, ray_index) + kernel_split_params.start_sample; + /* Get pixel and tile position associated with current work */ + get_work_pixel_tile_position(kg, &pixel_x, &pixel_y, &tile_x, &tile_y, work_index, ray_index); + + /* Remap rng_state according to the current work */ + rng_state = initial_rng + kernel_split_params.offset + pixel_x + pixel_y*stride; + /* Remap buffer according to the current work */ + buffer += (kernel_split_params.offset + pixel_x + pixel_y*stride) * kernel_data.film.pass_stride; + + /* Initialize random numbers and ray. */ + kernel_path_trace_setup(kg, rng_state, sample, pixel_x, pixel_y, &rng, ray); + + if(ray->t != 0.0f) { + /* Initialize throughput, L_transparent, Ray, PathState; + * These rays proceed with path-iteration. + */ + *throughput = make_float3(1.0f, 1.0f, 1.0f); + *L_transparent = 0.0f; + path_radiance_init(L, kernel_data.film.use_light_pass); + path_state_init(kg, &kernel_split_state.sd_DL_shadow[ray_index], state, &rng, sample, ray); +#ifdef __SUBSURFACE__ + kernel_path_subsurface_init_indirect(&kernel_split_state.ss_rays[ray_index]); +#endif +#ifdef __KERNEL_DEBUG__ + debug_data_init(debug_data); +#endif + ASSIGN_RAY_STATE(ray_state, ray_index, RAY_REGENERATED); + enqueue_flag = 1; + } + else { + /* These rays do not participate in path-iteration. */ + float4 L_rad = make_float4(0.0f, 0.0f, 0.0f, 0.0f); + /* Accumulate result in output buffer. */ + kernel_write_pass_float4(buffer, sample, L_rad); + path_rng_end(kg, rng_state, rng); + + ASSIGN_RAY_STATE(ray_state, ray_index, RAY_TO_REGENERATE); + } + } + } + kernel_split_state.rng[ray_index] = rng; + +#ifndef __COMPUTE_DEVICE_GPU__ + } +#endif + + /* Enqueue RAY_REGENERATED rays into QUEUE_ACTIVE_AND_REGENERATED_RAYS; + * These rays will be made active during next SceneIntersectkernel. + */ + enqueue_ray_index_local(ray_index, + QUEUE_ACTIVE_AND_REGENERATED_RAYS, + enqueue_flag, + kernel_split_params.queue_size, + local_queue_atomics, + kernel_split_state.queue_data, + kernel_split_params.queue_index); +} + +CCL_NAMESPACE_END |