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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.
*/
CCL_NAMESPACE_BEGIN
/*This kernel takes care of setting up ray for the next iteration of
* path-iteration and accumulating radiance corresponding to AO and
* direct-lighting
*
* Ray state of rays that are terminated in this kernel are changed
* to RAY_UPDATE_BUFFER.
*
* Note on queues:
* This kernel fetches rays from the queue QUEUE_ACTIVE_AND_REGENERATED_RAYS
* and processes only the rays of state RAY_ACTIVE.
* There are different points in this kernel where a ray may terminate and
* reach RAY_UPDATE_BUFF state. These rays are enqueued into
* QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS queue. These rays will still be present
* in QUEUE_ACTIVE_AND_REGENERATED_RAYS queue, but since their ray-state has
* been changed to RAY_UPDATE_BUFF, there is no problem.
*
* State of queues when this kernel is called:
* At entry,
* - QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE,
* RAY_REGENERATED, RAY_UPDATE_BUFFER rays.
* - QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be filled with
* RAY_TO_REGENERATE and RAY_UPDATE_BUFFER rays.
* At exit,
* - QUEUE_ACTIVE_AND_REGENERATED_RAYS will be filled with RAY_ACTIVE,
* RAY_REGENERATED and more RAY_UPDATE_BUFFER rays.
* - QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS will be filled with
* RAY_TO_REGENERATE and more RAY_UPDATE_BUFFER rays.
*/
#ifdef __BRANCHED_PATH__
ccl_device_inline void kernel_split_branched_indirect_light_init(KernelGlobals *kg, int ray_index)
{
kernel_split_branched_path_indirect_loop_init(kg, ray_index);
ADD_RAY_FLAG(kernel_split_state.ray_state, ray_index, RAY_BRANCHED_LIGHT_INDIRECT);
}
ccl_device void kernel_split_branched_indirect_light_end(KernelGlobals *kg, int ray_index)
{
kernel_split_branched_path_indirect_loop_end(kg, ray_index);
ccl_global float3 *throughput = &kernel_split_state.throughput[ray_index];
ShaderData *sd = kernel_split_sd(sd, ray_index);
ccl_global PathState *state = &kernel_split_state.path_state[ray_index];
ccl_global Ray *ray = &kernel_split_state.ray[ray_index];
/* continue in case of transparency */
*throughput *= shader_bsdf_transparency(kg, sd);
if(is_zero(*throughput)) {
kernel_split_path_end(kg, ray_index);
}
else {
/* Update Path State */
state->flag |= PATH_RAY_TRANSPARENT;
state->transparent_bounce++;
ray->P = ray_offset(sd->P, -sd->Ng);
ray->t -= sd->ray_length; /* clipping works through transparent */
# ifdef __RAY_DIFFERENTIALS__
ray->dP = sd->dP;
ray->dD.dx = -sd->dI.dx;
ray->dD.dy = -sd->dI.dy;
# endif /* __RAY_DIFFERENTIALS__ */
# ifdef __VOLUME__
/* enter/exit volume */
kernel_volume_stack_enter_exit(kg, sd, state->volume_stack);
# endif /* __VOLUME__ */
}
}
#endif /* __BRANCHED_PATH__ */
ccl_device void kernel_next_iteration_setup(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);
if(ccl_global_id(0) == 0 && ccl_global_id(1) == 0) {
/* If we are here, then it means that scene-intersect kernel
* has already been executed atleast once. From the next time,
* scene-intersect kernel may operate on queues to fetch ray index
*/
*kernel_split_params.use_queues_flag = 1;
/* Mark queue indices of QUEUE_SHADOW_RAY_CAST_AO_RAYS and
* QUEUE_SHADOW_RAY_CAST_DL_RAYS queues that were made empty during the
* previous kernel.
*/
kernel_split_params.queue_index[QUEUE_SHADOW_RAY_CAST_AO_RAYS] = 0;
kernel_split_params.queue_index[QUEUE_SHADOW_RAY_CAST_DL_RAYS] = 0;
}
int ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0);
ray_index = get_ray_index(kg, ray_index,
QUEUE_ACTIVE_AND_REGENERATED_RAYS,
kernel_split_state.queue_data,
kernel_split_params.queue_size,
0);
ccl_global char *ray_state = kernel_split_state.ray_state;
bool active = IS_STATE(ray_state, ray_index, RAY_ACTIVE);
if(active) {
ccl_global float3 *throughput = &kernel_split_state.throughput[ray_index];
ccl_global Ray *ray = &kernel_split_state.ray[ray_index];
ShaderData *sd = kernel_split_sd(sd, ray_index);
ccl_global PathState *state = &kernel_split_state.path_state[ray_index];
PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
#ifdef __BRANCHED_PATH__
if(!kernel_data.integrator.branched || IS_FLAG(ray_state, ray_index, RAY_BRANCHED_INDIRECT)) {
#endif
/* Compute direct lighting and next bounce. */
if(!kernel_path_surface_bounce(kg, sd, throughput, state, &L->state, ray)) {
kernel_split_path_end(kg, ray_index);
}
#ifdef __BRANCHED_PATH__
}
else {
kernel_split_branched_indirect_light_init(kg, ray_index);
if(kernel_split_branched_path_surface_indirect_light_iter(kg,
ray_index,
1.0f,
kernel_split_sd(branched_state_sd, ray_index),
true,
true))
{
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_REGENERATED);
}
else {
kernel_split_branched_indirect_light_end(kg, ray_index);
}
}
#endif /* __BRANCHED_PATH__ */
}
/* Enqueue RAY_UPDATE_BUFFER rays. */
enqueue_ray_index_local(ray_index,
QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS,
IS_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER) && active,
kernel_split_params.queue_size,
local_queue_atomics,
kernel_split_state.queue_data,
kernel_split_params.queue_index);
#ifdef __BRANCHED_PATH__
/* iter loop */
if(ccl_global_id(0) == 0 && ccl_global_id(1) == 0) {
kernel_split_params.queue_index[QUEUE_LIGHT_INDIRECT_ITER] = 0;
}
ray_index = get_ray_index(kg, ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0),
QUEUE_LIGHT_INDIRECT_ITER,
kernel_split_state.queue_data,
kernel_split_params.queue_size,
1);
if(IS_STATE(ray_state, ray_index, RAY_LIGHT_INDIRECT_NEXT_ITER)) {
/* for render passes, sum and reset indirect light pass variables
* for the next samples */
PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
path_radiance_sum_indirect(L);
path_radiance_reset_indirect(L);
if(kernel_split_branched_path_surface_indirect_light_iter(kg,
ray_index,
1.0f,
kernel_split_sd(branched_state_sd, ray_index),
true,
true))
{
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_REGENERATED);
}
else {
kernel_split_branched_indirect_light_end(kg, ray_index);
}
}
# ifdef __VOLUME__
/* Enqueue RAY_VOLUME_INDIRECT_NEXT_ITER rays */
ccl_barrier(CCL_LOCAL_MEM_FENCE);
if(ccl_local_id(0) == 0 && ccl_local_id(1) == 0) {
*local_queue_atomics = 0;
}
ccl_barrier(CCL_LOCAL_MEM_FENCE);
ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0);
enqueue_ray_index_local(ray_index,
QUEUE_VOLUME_INDIRECT_ITER,
IS_STATE(kernel_split_state.ray_state, ray_index, RAY_VOLUME_INDIRECT_NEXT_ITER),
kernel_split_params.queue_size,
local_queue_atomics,
kernel_split_state.queue_data,
kernel_split_params.queue_index);
# endif /* __VOLUME__ */
# ifdef __SUBSURFACE__
/* Enqueue RAY_SUBSURFACE_INDIRECT_NEXT_ITER rays */
ccl_barrier(CCL_LOCAL_MEM_FENCE);
if(ccl_local_id(0) == 0 && ccl_local_id(1) == 0) {
*local_queue_atomics = 0;
}
ccl_barrier(CCL_LOCAL_MEM_FENCE);
ray_index = ccl_global_id(1) * ccl_global_size(0) + ccl_global_id(0);
enqueue_ray_index_local(ray_index,
QUEUE_SUBSURFACE_INDIRECT_ITER,
IS_STATE(kernel_split_state.ray_state, ray_index, RAY_SUBSURFACE_INDIRECT_NEXT_ITER),
kernel_split_params.queue_size,
local_queue_atomics,
kernel_split_state.queue_data,
kernel_split_params.queue_index);
# endif /* __SUBSURFACE__ */
#endif /* __BRANCHED_PATH__ */
}
CCL_NAMESPACE_END
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