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Diffstat (limited to 'intern/cycles/kernel/kernel_shader.h')
| -rw-r--r-- | intern/cycles/kernel/kernel_shader.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/intern/cycles/kernel/kernel_shader.h b/intern/cycles/kernel/kernel_shader.h index 5ef4475e259..bb3add5d7ca 100644 --- a/intern/cycles/kernel/kernel_shader.h +++ b/intern/cycles/kernel/kernel_shader.h @@ -494,6 +494,34 @@ ccl_device_inline void shader_merge_closures(ShaderData *sd) } #endif +/* Defensive sampling. */ + +ccl_device_inline void shader_prepare_closures(ShaderData *sd, + ccl_addr_space PathState *state) +{ + /* We can likely also do defensive sampling at deeper bounces, particularly + * for cases like a perfect mirror but possibly also others. This will need + * a good heuristic. */ + if(state->bounce + state->transparent_bounce == 0 && sd->num_closure > 1) { + float sum = 0.0f; + + for(int i = 0; i < sd->num_closure; i++) { + ShaderClosure *sc = &sd->closure[i]; + if(CLOSURE_IS_BSDF_OR_BSSRDF(sc->type)) { + sum += sc->sample_weight; + } + } + + for(int i = 0; i < sd->num_closure; i++) { + ShaderClosure *sc = &sd->closure[i]; + if(CLOSURE_IS_BSDF_OR_BSSRDF(sc->type)) { + sc->sample_weight = max(sc->sample_weight, 0.125f * sum); + } + } + } +} + + /* BSDF */ ccl_device_inline void _shader_bsdf_multi_eval(KernelGlobals *kg, ShaderData *sd, const float3 omega_in, float *pdf, |