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/*
* Copyright 2011-2013 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 __VOLUME__
ccl_device_inline void kernel_path_volume_connect_light(KernelGlobals *kg, RNG *rng,
ShaderData *sd, float3 throughput, PathState *state, PathRadiance *L, float num_samples_adjust)
{
#ifdef __EMISSION__
if(!(kernel_data.integrator.use_direct_light && (sd->flag & SD_BSDF_HAS_EVAL)))
return;
/* sample illumination from lights to find path contribution */
float light_t = path_state_rng_1D(kg, rng, state, PRNG_LIGHT);
float light_u, light_v;
path_state_rng_2D(kg, rng, state, PRNG_LIGHT_U, &light_u, &light_v);
Ray light_ray;
BsdfEval L_light;
bool is_lamp;
#ifdef __OBJECT_MOTION__
light_ray.time = sd->time;
#endif
LightSample ls;
light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, &ls);
if(direct_emission(kg, sd, &ls, &light_ray, &L_light, &is_lamp, state->bounce, state->transparent_bounce)) {
/* trace shadow ray */
float3 shadow;
if(!shadow_blocked(kg, state, &light_ray, &shadow)) {
/* accumulate */
path_radiance_accum_light(L, throughput * num_samples_adjust, &L_light, shadow, 1.0f, state->bounce, is_lamp);
}
}
#endif
}
ccl_device_inline bool kernel_path_volume_bounce(KernelGlobals *kg, RNG *rng,
ShaderData *sd, float3 *throughput, PathState *state, PathRadiance *L, Ray *ray,
float num_samples_adjust)
{
/* sample phase function */
float phase_pdf;
BsdfEval phase_eval;
float3 phase_omega_in;
differential3 phase_domega_in;
float phase_u, phase_v;
path_state_rng_2D(kg, rng, state, PRNG_PHASE_U, &phase_u, &phase_v);
int label;
label = shader_volume_phase_sample(kg, sd, phase_u, phase_v, &phase_eval,
&phase_omega_in, &phase_domega_in, &phase_pdf);
if(phase_pdf == 0.0f || bsdf_eval_is_zero(&phase_eval))
return false;
/* modify throughput */
path_radiance_bsdf_bounce(L, throughput, &phase_eval, phase_pdf, state->bounce, label);
/* set labels */
state->ray_pdf = phase_pdf;
#ifdef __LAMP_MIS__
state->ray_t = 0.0f;
#endif
state->min_ray_pdf = fminf(phase_pdf, state->min_ray_pdf);
/* update path state */
path_state_next(kg, state, label);
/* setup ray */
ray->P = sd->P;
ray->D = phase_omega_in;
ray->t = FLT_MAX;
#ifdef __RAY_DIFFERENTIALS__
ray->dP = sd->dP;
ray->dD = phase_domega_in;
#endif
return true;
}
#endif
CCL_NAMESPACE_END
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