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/*
* Copyright 2011-2017 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
#ifdef __BRANCHED_PATH__
/* sets up the various state needed to do an indirect loop */
ccl_device_inline void kernel_split_branched_path_indirect_loop_init(KernelGlobals *kg, int ray_index)
{
SplitBranchedState *branched_state = &kernel_split_state.branched_state[ray_index];
/* save a copy of the state to restore later */
#define BRANCHED_STORE(name) \
branched_state->name = kernel_split_state.name[ray_index];
BRANCHED_STORE(path_state);
BRANCHED_STORE(throughput);
BRANCHED_STORE(ray);
BRANCHED_STORE(sd);
BRANCHED_STORE(isect);
BRANCHED_STORE(ray_state);
#undef BRANCHED_STORE
/* set loop counters to intial position */
branched_state->next_closure = 0;
branched_state->next_sample = 0;
}
/* ends an indirect loop and restores the previous state */
ccl_device_inline void kernel_split_branched_path_indirect_loop_end(KernelGlobals *kg, int ray_index)
{
SplitBranchedState *branched_state = &kernel_split_state.branched_state[ray_index];
/* restore state */
#define BRANCHED_RESTORE(name) \
kernel_split_state.name[ray_index] = branched_state->name;
BRANCHED_RESTORE(path_state);
BRANCHED_RESTORE(throughput);
BRANCHED_RESTORE(ray);
BRANCHED_RESTORE(sd);
BRANCHED_RESTORE(isect);
BRANCHED_RESTORE(ray_state);
#undef BRANCHED_RESTORE
/* leave indirect loop */
REMOVE_RAY_FLAG(kernel_split_state.ray_state, ray_index, RAY_BRANCHED_INDIRECT);
}
ccl_device_inline bool kernel_split_branched_indirect_start_shared(KernelGlobals *kg, int ray_index)
{
ccl_global char *ray_state = kernel_split_state.ray_state;
int inactive_ray = dequeue_ray_index(QUEUE_INACTIVE_RAYS,
kernel_split_state.queue_data, kernel_split_params.queue_size, kernel_split_params.queue_index);
if(!IS_STATE(ray_state, inactive_ray, RAY_INACTIVE)) {
return false;
}
#define SPLIT_DATA_ENTRY(type, name, num) \
kernel_split_state.name[inactive_ray] = kernel_split_state.name[ray_index];
SPLIT_DATA_ENTRIES_BRANCHED_SHARED
#undef SPLIT_DATA_ENTRY
kernel_split_state.branched_state[inactive_ray].shared_sample_count = 0;
kernel_split_state.branched_state[inactive_ray].original_ray = ray_index;
kernel_split_state.branched_state[inactive_ray].waiting_on_shared_samples = false;
PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
PathRadiance *inactive_L = &kernel_split_state.path_radiance[inactive_ray];
path_radiance_init(inactive_L, kernel_data.film.use_light_pass);
inactive_L->direct_throughput = L->direct_throughput;
path_radiance_copy_indirect(inactive_L, L);
ray_state[inactive_ray] = RAY_REGENERATED;
ADD_RAY_FLAG(ray_state, inactive_ray, RAY_BRANCHED_INDIRECT_SHARED);
ADD_RAY_FLAG(ray_state, inactive_ray, IS_FLAG(ray_state, ray_index, RAY_BRANCHED_INDIRECT));
atomic_fetch_and_inc_uint32((ccl_global uint*)&kernel_split_state.branched_state[ray_index].shared_sample_count);
return true;
}
/* bounce off surface and integrate indirect light */
ccl_device_noinline bool kernel_split_branched_path_surface_indirect_light_iter(KernelGlobals *kg,
int ray_index,
float num_samples_adjust,
ShaderData *saved_sd,
bool reset_path_state,
bool wait_for_shared)
{
SplitBranchedState *branched_state = &kernel_split_state.branched_state[ray_index];
ShaderData *sd = saved_sd;
RNG rng = kernel_split_state.rng[ray_index];
PathRadiance *L = &kernel_split_state.path_radiance[ray_index];
float3 throughput = branched_state->throughput;
ccl_global PathState *ps = &kernel_split_state.path_state[ray_index];
float sum_sample_weight = 0.0f;
#ifdef __DENOISING_FEATURES__
if(ps->denoising_feature_weight > 0.0f) {
for(int i = 0; i < sd->num_closure; i++) {
const ShaderClosure *sc = &sd->closure[i];
/* transparency is not handled here, but in outer loop */
if(!CLOSURE_IS_BSDF(sc->type) || CLOSURE_IS_BSDF_TRANSPARENT(sc->type)) {
continue;
}
sum_sample_weight += sc->sample_weight;
}
}
else {
sum_sample_weight = 1.0f;
}
#endif /* __DENOISING_FEATURES__ */
for(int i = branched_state->next_closure; i < sd->num_closure; i++) {
const ShaderClosure *sc = &sd->closure[i];
if(!CLOSURE_IS_BSDF(sc->type))
continue;
/* transparency is not handled here, but in outer loop */
if(sc->type == CLOSURE_BSDF_TRANSPARENT_ID)
continue;
int num_samples;
if(CLOSURE_IS_BSDF_DIFFUSE(sc->type))
num_samples = kernel_data.integrator.diffuse_samples;
else if(CLOSURE_IS_BSDF_BSSRDF(sc->type))
num_samples = 1;
else if(CLOSURE_IS_BSDF_GLOSSY(sc->type))
num_samples = kernel_data.integrator.glossy_samples;
else
num_samples = kernel_data.integrator.transmission_samples;
num_samples = ceil_to_int(num_samples_adjust*num_samples);
float num_samples_inv = num_samples_adjust/num_samples;
RNG bsdf_rng = cmj_hash(rng, i);
for(int j = branched_state->next_sample; j < num_samples; j++) {
if(reset_path_state) {
*ps = branched_state->path_state;
}
ccl_global float3 *tp = &kernel_split_state.throughput[ray_index];
*tp = throughput;
ccl_global Ray *bsdf_ray = &kernel_split_state.ray[ray_index];
if(!kernel_branched_path_surface_bounce(kg,
&bsdf_rng,
sd,
sc,
j,
num_samples,
tp,
ps,
L,
bsdf_ray,
sum_sample_weight))
{
continue;
}
/* update state for next iteration */
branched_state->next_closure = i;
branched_state->next_sample = j+1;
branched_state->num_samples = num_samples;
/* start the indirect path */
*tp *= num_samples_inv;
if(kernel_split_branched_indirect_start_shared(kg, ray_index)) {
continue;
}
return true;
}
branched_state->next_sample = 0;
}
branched_state->next_closure = sd->num_closure;
if(wait_for_shared) {
branched_state->waiting_on_shared_samples = (branched_state->shared_sample_count > 0);
if(branched_state->waiting_on_shared_samples) {
return true;
}
}
return false;
}
#endif /* __BRANCHED_PATH__ */
CCL_NAMESPACE_END
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