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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 operates on QUEUE_ACTIVE_AND_REGENERATED_RAYS.
* It processes rays of state RAY_ACTIVE and RAY_HIT_BACKGROUND.
* We will empty QUEUE_ACTIVE_AND_REGENERATED_RAYS queue in this kernel.
*/
ccl_device void kernel_lamp_emission(KernelGlobals *kg)
{
#ifndef __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;
}
#endif
/* 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,
#ifndef __VOLUME__
1
#else
0
#endif
);
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))
{
PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
ccl_global PathState *state = &kernel_split_state.path_state[ray_index];
float3 throughput = kernel_split_state.throughput[ray_index];
Ray ray = kernel_split_state.ray[ray_index];
#ifdef __LAMP_MIS__
if(kernel_data.integrator.use_lamp_mis && !(state->flag & PATH_RAY_CAMERA)) {
/* ray starting from previous non-transparent bounce */
Ray light_ray;
light_ray.P = ray.P - state->ray_t*ray.D;
state->ray_t += kernel_split_state.isect[ray_index].t;
light_ray.D = ray.D;
light_ray.t = state->ray_t;
light_ray.time = ray.time;
light_ray.dD = ray.dD;
light_ray.dP = ray.dP;
/* intersect with lamp */
float3 emission;
if(indirect_lamp_emission(kg, &kernel_split_state.sd_DL_shadow[ray_index], state, &light_ray, &emission)) {
path_radiance_accum_emission(L, throughput, emission, state->bounce);
}
}
#endif /* __LAMP_MIS__ */
}
}
CCL_NAMESPACE_END
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