diff options
Diffstat (limited to 'intern/cycles/kernel/split/kernel_do_volume.h')
| -rw-r--r-- | intern/cycles/kernel/split/kernel_do_volume.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/intern/cycles/kernel/split/kernel_do_volume.h b/intern/cycles/kernel/split/kernel_do_volume.h index 694b777f429..9f8dd2392d9 100644 --- a/intern/cycles/kernel/split/kernel_do_volume.h +++ b/intern/cycles/kernel/split/kernel_do_volume.h @@ -75,11 +75,30 @@ ccl_device_noinline bool kernel_split_branched_path_volume_indirect_light_iter(K branched_state->next_sample = j+1; branched_state->num_samples = num_samples; + /* Attempting to share too many samples is slow for volumes as it causes us to + * loop here more and have many calls to kernel_volume_integrate which evaluates + * shaders. The many expensive shader evaluations cause the work load to become + * unbalanced and many threads to become idle in this kernel. Limiting the + * number of shared samples here helps quite a lot. + */ + if(branched_state->shared_sample_count < 2) { + if(kernel_split_branched_indirect_start_shared(kg, ray_index)) { + continue; + } + } + return true; } # endif } + branched_state->next_sample = num_samples; + + branched_state->waiting_on_shared_samples = (branched_state->shared_sample_count > 0); + if(branched_state->waiting_on_shared_samples) { + return true; + } + kernel_split_branched_path_indirect_loop_end(kg, ray_index); /* todo: avoid this calculation using decoupled ray marching */ |