271 lines
8.3 KiB
C
271 lines
8.3 KiB
C
/*
|
|
* 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_SCATTER__
|
|
|
|
ccl_device void kernel_path_volume_connect_light(KernelGlobals *kg, RNG *rng,
|
|
ShaderData *sd, ShaderData *emission_sd, float3 throughput, PathState *state, PathRadiance *L)
|
|
{
|
|
#ifdef __EMISSION__
|
|
if(!kernel_data.integrator.use_direct_light)
|
|
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;
|
|
LightSample ls;
|
|
bool is_lamp;
|
|
|
|
/* connect to light from given point where shader has been evaluated */
|
|
# ifdef __OBJECT_MOTION__
|
|
light_ray.time = sd->time;
|
|
# endif
|
|
|
|
light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls);
|
|
if(ls.pdf == 0.0f)
|
|
return;
|
|
|
|
if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp)) {
|
|
/* trace shadow ray */
|
|
float3 shadow;
|
|
|
|
if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
|
|
/* accumulate */
|
|
path_radiance_accum_light(L, throughput, &L_light, shadow, 1.0f, state->bounce, is_lamp);
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#ifdef __KERNEL_GPU__
|
|
ccl_device_noinline
|
|
#else
|
|
ccl_device
|
|
#endif
|
|
bool kernel_path_volume_bounce(KernelGlobals *kg, RNG *rng,
|
|
ShaderData *sd, float3 *throughput, PathState *state, PathRadiance *L, Ray *ray)
|
|
{
|
|
/* 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;
|
|
}
|
|
|
|
ccl_device void kernel_branched_path_volume_connect_light(KernelGlobals *kg, RNG *rng,
|
|
ShaderData *sd, ShaderData *emission_sd, float3 throughput, PathState *state, PathRadiance *L,
|
|
bool sample_all_lights, Ray *ray, const VolumeSegment *segment)
|
|
{
|
|
#ifdef __EMISSION__
|
|
if(!kernel_data.integrator.use_direct_light)
|
|
return;
|
|
|
|
Ray light_ray;
|
|
BsdfEval L_light;
|
|
bool is_lamp;
|
|
|
|
# ifdef __OBJECT_MOTION__
|
|
light_ray.time = sd->time;
|
|
# endif
|
|
|
|
if(sample_all_lights) {
|
|
/* lamp sampling */
|
|
for(int i = 0; i < kernel_data.integrator.num_all_lights; i++) {
|
|
if(UNLIKELY(light_select_reached_max_bounces(kg, i, state->bounce)))
|
|
continue;
|
|
|
|
int num_samples = light_select_num_samples(kg, i);
|
|
float num_samples_inv = 1.0f/(num_samples*kernel_data.integrator.num_all_lights);
|
|
RNG lamp_rng = cmj_hash(*rng, i);
|
|
|
|
if(kernel_data.integrator.pdf_triangles != 0.0f)
|
|
num_samples_inv *= 0.5f;
|
|
|
|
for(int j = 0; j < num_samples; j++) {
|
|
/* sample random position on given light */
|
|
float light_u, light_v;
|
|
path_branched_rng_2D(kg, &lamp_rng, state, j, num_samples, PRNG_LIGHT_U, &light_u, &light_v);
|
|
|
|
LightSample ls;
|
|
lamp_light_sample(kg, i, light_u, light_v, ray->P, &ls);
|
|
|
|
float3 tp = throughput;
|
|
|
|
/* sample position on volume segment */
|
|
float rphase = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_PHASE);
|
|
float rscatter = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_SCATTER_DISTANCE);
|
|
|
|
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,
|
|
state, ray, sd, &tp, rphase, rscatter, segment, (ls.t != FLT_MAX)? &ls.P: NULL, false);
|
|
|
|
(void)result;
|
|
kernel_assert(result == VOLUME_PATH_SCATTERED);
|
|
|
|
/* todo: split up light_sample so we don't have to call it again with new position */
|
|
lamp_light_sample(kg, i, light_u, light_v, sd->P, &ls);
|
|
|
|
if(ls.pdf == 0.0f)
|
|
continue;
|
|
|
|
if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp)) {
|
|
/* trace shadow ray */
|
|
float3 shadow;
|
|
|
|
if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
|
|
/* accumulate */
|
|
path_radiance_accum_light(L, tp*num_samples_inv, &L_light, shadow, num_samples_inv, state->bounce, is_lamp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* mesh light sampling */
|
|
if(kernel_data.integrator.pdf_triangles != 0.0f) {
|
|
int num_samples = kernel_data.integrator.mesh_light_samples;
|
|
float num_samples_inv = 1.0f/num_samples;
|
|
|
|
if(kernel_data.integrator.num_all_lights)
|
|
num_samples_inv *= 0.5f;
|
|
|
|
for(int j = 0; j < num_samples; j++) {
|
|
/* sample random position on random triangle */
|
|
float light_t = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_LIGHT);
|
|
float light_u, light_v;
|
|
path_branched_rng_2D(kg, rng, state, j, num_samples, PRNG_LIGHT_U, &light_u, &light_v);
|
|
|
|
/* only sample triangle lights */
|
|
if(kernel_data.integrator.num_all_lights)
|
|
light_t = 0.5f*light_t;
|
|
|
|
LightSample ls;
|
|
light_sample(kg, light_t, light_u, light_v, sd->time, ray->P, state->bounce, &ls);
|
|
|
|
float3 tp = throughput;
|
|
|
|
/* sample position on volume segment */
|
|
float rphase = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_PHASE);
|
|
float rscatter = path_branched_rng_1D_for_decision(kg, rng, state, j, num_samples, PRNG_SCATTER_DISTANCE);
|
|
|
|
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,
|
|
state, ray, sd, &tp, rphase, rscatter, segment, (ls.t != FLT_MAX)? &ls.P: NULL, false);
|
|
|
|
(void)result;
|
|
kernel_assert(result == VOLUME_PATH_SCATTERED);
|
|
|
|
/* todo: split up light_sample so we don't have to call it again with new position */
|
|
light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls);
|
|
|
|
if(ls.pdf == 0.0f)
|
|
continue;
|
|
|
|
if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp)) {
|
|
/* trace shadow ray */
|
|
float3 shadow;
|
|
|
|
if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
|
|
/* accumulate */
|
|
path_radiance_accum_light(L, tp*num_samples_inv, &L_light, shadow, num_samples_inv, state->bounce, is_lamp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else {
|
|
/* sample random position on random light */
|
|
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);
|
|
|
|
LightSample ls;
|
|
light_sample(kg, light_t, light_u, light_v, sd->time, ray->P, state->bounce, &ls);
|
|
|
|
float3 tp = throughput;
|
|
|
|
/* sample position on volume segment */
|
|
float rphase = path_state_rng_1D_for_decision(kg, rng, state, PRNG_PHASE);
|
|
float rscatter = path_state_rng_1D_for_decision(kg, rng, state, PRNG_SCATTER_DISTANCE);
|
|
|
|
VolumeIntegrateResult result = kernel_volume_decoupled_scatter(kg,
|
|
state, ray, sd, &tp, rphase, rscatter, segment, (ls.t != FLT_MAX)? &ls.P: NULL, false);
|
|
|
|
(void)result;
|
|
kernel_assert(result == VOLUME_PATH_SCATTERED);
|
|
|
|
/* todo: split up light_sample so we don't have to call it again with new position */
|
|
light_sample(kg, light_t, light_u, light_v, sd->time, sd->P, state->bounce, &ls);
|
|
|
|
if(ls.pdf == 0.0f)
|
|
return;
|
|
|
|
/* sample random light */
|
|
if(direct_emission(kg, sd, emission_sd, &ls, state, &light_ray, &L_light, &is_lamp)) {
|
|
/* trace shadow ray */
|
|
float3 shadow;
|
|
|
|
if(!shadow_blocked(kg, emission_sd, state, &light_ray, &shadow)) {
|
|
/* accumulate */
|
|
path_radiance_accum_light(L, tp, &L_light, shadow, 1.0f, state->bounce, is_lamp);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
}
|
|
|
|
#endif
|
|
|
|
CCL_NAMESPACE_END
|
|
|