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diff --git a/intern/cycles/kernel/split/kernel_background_buffer_update.h b/intern/cycles/kernel/split/kernel_background_buffer_update.h
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--- a/intern/cycles/kernel/split/kernel_background_buffer_update.h
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-/*
- * 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.
- */
-
-#include "kernel_split_common.h"
-
-/* Note on kernel_background_buffer_update kernel.
- * This is the fourth kernel in the ray tracing logic, and the third
- * of the path iteration kernels. 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.
- *
- * The input and output are as follows,
- *
- * rng_coop ---------------------------------------------|--- kernel_background_buffer_update --|--- PathRadiance_coop
- * throughput_coop --------------------------------------| |--- L_transparent_coop
- * per_sample_output_buffers ----------------------------| |--- per_sample_output_buffers
- * Ray_coop ---------------------------------------------| |--- ray_state
- * PathState_coop ---------------------------------------| |--- Queue_data (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
- * L_transparent_coop -----------------------------------| |--- Queue_data (QUEUE_ACTIVE_AND_REGENERATED_RAYS)
- * ray_state --------------------------------------------| |--- Queue_index (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS)
- * Queue_data (QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS) ----| |--- Queue_index (QUEUE_ACTIVE_AND_REGENERATED_RAYS)
- * Queue_index (QUEUE_ACTIVE_AND_REGENERATED_RAYS) ------| |--- work_array
- * parallel_samples -------------------------------------| |--- PathState_coop
- * end_sample -------------------------------------------| |--- throughput_coop
- * kg (globals) -----------------------------------------| |--- rng_coop
- * rng_state --------------------------------------------| |--- Ray
- * PathRadiance_coop ------------------------------------| |
- * sw ---------------------------------------------------| |
- * sh ---------------------------------------------------| |
- * sx ---------------------------------------------------| |
- * sy ---------------------------------------------------| |
- * stride -----------------------------------------------| |
- * work_array -------------------------------------------| |--- work_array
- * queuesize --------------------------------------------| |
- * start_sample -----------------------------------------| |--- work_pool_wgs
- * work_pool_wgs ----------------------------------------| |
- * num_samples ------------------------------------------| |
- *
- * note on sd : sd argument is neither an input nor an output for this kernel. It is just filled and consumed here itself.
- * Note on Queues :
- * This kernel fetches rays from QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue.
- *
- * 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 char kernel_background_buffer_update(
- KernelGlobals *kg,
- ccl_global float *per_sample_output_buffers,
- ccl_global uint *rng_state,
- ccl_global uint *rng_coop, /* Required for buffer Update */
- ccl_global float3 *throughput_coop, /* Required for background hit processing */
- PathRadiance *PathRadiance_coop, /* Required for background hit processing and buffer Update */
- ccl_global Ray *Ray_coop, /* Required for background hit processing */
- ccl_global PathState *PathState_coop, /* Required for background hit processing */
- ccl_global float *L_transparent_coop, /* Required for background hit processing and buffer Update */
- ccl_global char *ray_state, /* Stores information on the current state of a ray */
- int sw, int sh, int sx, int sy, int stride,
- int rng_state_offset_x,
- int rng_state_offset_y,
- int rng_state_stride,
- ccl_global unsigned int *work_array, /* Denotes work of each ray */
- int end_sample,
- int start_sample,
-#ifdef __WORK_STEALING__
- ccl_global unsigned int *work_pool_wgs,
- unsigned int num_samples,
-#endif
-#ifdef __KERNEL_DEBUG__
- DebugData *debugdata_coop,
-#endif
- int parallel_samples, /* Number of samples to be processed in parallel */
- int ray_index)
-{
- char enqueue_flag = 0;
-#ifdef __KERNEL_DEBUG__
- DebugData *debug_data = &debugdata_coop[ray_index];
-#endif
- ccl_global PathState *state = &PathState_coop[ray_index];
- PathRadiance *L = L = &PathRadiance_coop[ray_index];
- ccl_global Ray *ray = &Ray_coop[ray_index];
- ccl_global float3 *throughput = &throughput_coop[ray_index];
- ccl_global float *L_transparent = &L_transparent_coop[ray_index];
- ccl_global uint *rng = &rng_coop[ray_index];
-
-#ifdef __WORK_STEALING__
- unsigned int my_work;
- ccl_global float *initial_per_sample_output_buffers;
- ccl_global uint *initial_rng;
-#endif
- unsigned int sample;
- unsigned int tile_x;
- unsigned int tile_y;
- unsigned int pixel_x;
- unsigned int pixel_y;
- unsigned int my_sample_tile;
-
-#ifdef __WORK_STEALING__
- my_work = work_array[ray_index];
- sample = get_my_sample(my_work, sw, sh, parallel_samples, ray_index) + start_sample;
- get_pixel_tile_position(&pixel_x, &pixel_y,
- &tile_x, &tile_y,
- my_work,
- sw, sh, sx, sy,
- parallel_samples,
- ray_index);
- my_sample_tile = 0;
- initial_per_sample_output_buffers = per_sample_output_buffers;
- initial_rng = rng_state;
-#else /* __WORK_STEALING__ */
- sample = work_array[ray_index];
- int tile_index = ray_index / parallel_samples;
- /* buffer and rng_state's stride is "stride". Find x and y using ray_index */
- tile_x = tile_index % sw;
- tile_y = tile_index / sw;
- my_sample_tile = ray_index - (tile_index * parallel_samples);
-#endif /* __WORK_STEALING__ */
-
- rng_state += (rng_state_offset_x + tile_x) + (rng_state_offset_y + tile_y) * rng_state_stride;
- per_sample_output_buffers += (((tile_x + (tile_y * stride)) * parallel_samples) + my_sample_tile) * kernel_data.film.pass_stride;
-
- if(IS_STATE(ray_state, ray_index, RAY_HIT_BACKGROUND)) {
- /* eval background shader if nothing hit */
- if(kernel_data.background.transparent && (state->flag & PATH_RAY_CAMERA)) {
- *L_transparent = (*L_transparent) + average((*throughput));
-#ifdef __PASSES__
- if(!(kernel_data.film.pass_flag & PASS_BACKGROUND))
-#endif
- ASSIGN_RAY_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER);
- }
-
- if(IS_STATE(ray_state, ray_index, RAY_HIT_BACKGROUND)) {
-#ifdef __BACKGROUND__
- /* sample background shader */
- float3 L_background = indirect_background(kg, kg->sd_input, state, ray);
- path_radiance_accum_background(L, (*throughput), L_background, state->bounce);
-#endif
- ASSIGN_RAY_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER);
- }
- }
-
- if(IS_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER)) {
- float3 L_sum = path_radiance_clamp_and_sum(kg, L);
- kernel_write_light_passes(kg, per_sample_output_buffers, L, sample);
-#ifdef __KERNEL_DEBUG__
- kernel_write_debug_passes(kg, per_sample_output_buffers, 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(per_sample_output_buffers, 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)) {
-#ifdef __WORK_STEALING__
- /* We have completed current work; So get next work */
- int valid_work = get_next_work(work_pool_wgs, &my_work, sw, sh, num_samples, parallel_samples, 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);
- }
-#else /* __WORK_STEALING__ */
- if((sample + parallel_samples) >= end_sample) {
- ASSIGN_RAY_STATE(ray_state, ray_index, RAY_INACTIVE);
- }
-#endif /* __WORK_STEALING__ */
-
- if(IS_STATE(ray_state, ray_index, RAY_TO_REGENERATE)) {
-#ifdef __WORK_STEALING__
- work_array[ray_index] = my_work;
- /* Get the sample associated with the current work */
- sample = get_my_sample(my_work, sw, sh, parallel_samples, ray_index) + start_sample;
- /* Get pixel and tile position associated with current work */
- get_pixel_tile_position(&pixel_x, &pixel_y, &tile_x, &tile_y, my_work, sw, sh, sx, sy, parallel_samples, ray_index);
- my_sample_tile = 0;
-
- /* Remap rng_state according to the current work */
- rng_state = initial_rng + ((rng_state_offset_x + tile_x) + (rng_state_offset_y + tile_y) * rng_state_stride);
- /* Remap per_sample_output_buffers according to the current work */
- per_sample_output_buffers = initial_per_sample_output_buffers
- + (((tile_x + (tile_y * stride)) * parallel_samples) + my_sample_tile) * kernel_data.film.pass_stride;
-#else /* __WORK_STEALING__ */
- work_array[ray_index] = sample + parallel_samples;
- sample = work_array[ray_index];
-
- /* Get ray position from ray index */
- pixel_x = sx + ((ray_index / parallel_samples) % sw);
- pixel_y = sy + ((ray_index / parallel_samples) / sw);
-#endif /* __WORK_STEALING__ */
-
- /* 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, kg->sd_input, state, rng, sample, ray);
-#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(per_sample_output_buffers, sample, L_rad);
- path_rng_end(kg, rng_state, *rng);
-
- ASSIGN_RAY_STATE(ray_state, ray_index, RAY_TO_REGENERATE);
- }
- }
- }
- return enqueue_flag;
-}
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