diff options
Diffstat (limited to 'intern/cycles/kernel/split/kernel_branched.h')
| -rw-r--r-- | intern/cycles/kernel/split/kernel_branched.h | 150 |
1 files changed, 150 insertions, 0 deletions
diff --git a/intern/cycles/kernel/split/kernel_branched.h b/intern/cycles/kernel/split/kernel_branched.h new file mode 100644 index 00000000000..c7bc1b4df0a --- /dev/null +++ b/intern/cycles/kernel/split/kernel_branched.h @@ -0,0 +1,150 @@ +/* + * 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); +} + +/* 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) +{ + 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; + + 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++) { + ccl_global PathState *ps = &kernel_split_state.path_state[ray_index]; + 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)) + { + 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; + + return true; + } + + branched_state->next_sample = 0; + } + + return false; +} + +#endif /* __BRANCHED_PATH__ */ + +CCL_NAMESPACE_END + |