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CCL_NAMESPACE_BEGIN
ccl_device void kernel_subsurface_scatter(KernelGlobals *kg)
{
#ifdef __SUBSURFACE__
ccl_local 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);
ray_index = get_ray_index(kg, ray_index,
QUEUE_ACTIVE_AND_REGENERATED_RAYS,
kernel_split_state.queue_data,
kernel_split_params.queue_size,
0);
#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
char enqueue_flag = 0;
ccl_global char *ray_state = kernel_split_state.ray_state;
ccl_global PathState *state = &kernel_split_state.path_state[ray_index];
PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
ccl_global RNG *rng = &kernel_split_state.rng[ray_index];
ccl_global Ray *ray = &kernel_split_state.ray[ray_index];
ccl_global float3 *throughput = &kernel_split_state.throughput[ray_index];
ccl_global SubsurfaceIndirectRays *ss_indirect = &kernel_split_state.ss_rays[ray_index];
ShaderData *sd = &kernel_split_state.sd[ray_index];
ShaderData *emission_sd = &kernel_split_state.sd_DL_shadow[ray_index];
if(IS_STATE(ray_state, ray_index, RAY_ACTIVE)) {
if(sd->flag & SD_BSSRDF) {
if(kernel_path_subsurface_scatter(kg,
sd,
emission_sd,
L,
state,
rng,
ray,
throughput,
ss_indirect)) {
ASSIGN_RAY_STATE(ray_state, ray_index, RAY_UPDATE_BUFFER);
enqueue_flag = 1;
}
}
}
#ifndef __COMPUTE_DEVICE_GPU__
}
#endif
/* Enqueue RAY_UPDATE_BUFFER rays. */
enqueue_ray_index_local(ray_index,
QUEUE_HITBG_BUFF_UPDATE_TOREGEN_RAYS,
enqueue_flag,
kernel_split_params.queue_size,
&local_queue_atomics,
kernel_split_state.queue_data,
kernel_split_params.queue_index);
#endif /* __SUBSURFACE__ */
}
CCL_NAMESPACE_END
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