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Cycles: add shadow path compaction for GPU rendering

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Similar to main path compaction that happens before adding work tiles, this
compacts shadow paths before launching kernels that may add shadow paths.

Only do it when more than 50% of space is wasted.

It's not a clear win in all scenes, some are up to 1.5% slower. Likely caused
by different order of scheduling kernels having an unpredictable performance
impact. Still feels like compaction is just the right thing to avoid cases
where a few shadow paths can hold up a lot of main paths.

Differential Revision: https://developer.blender.org/D12944
This commit is contained in:
Brecht Van Lommel
2021-10-21 15:14:30 +02:00
committed by Brecht Van Lommel
parent fd560ef2af
commit df00463764
8 changed files with 188 additions and 32 deletions
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6
intern/cycles/device/device_kernel.cpp
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@@ -64,6 +64,12 @@ const char *device_kernel_as_string(DeviceKernel kernel)
return "integrator_compact_paths_array";
case DEVICE_KERNEL_INTEGRATOR_COMPACT_STATES:
return "integrator_compact_states";
case DEVICE_KERNEL_INTEGRATOR_TERMINATED_SHADOW_PATHS_ARRAY:
return "integrator_terminated_shadow_paths_array";
case DEVICE_KERNEL_INTEGRATOR_COMPACT_SHADOW_PATHS_ARRAY:
return "integrator_compact_shadow_paths_array";
case DEVICE_KERNEL_INTEGRATOR_COMPACT_SHADOW_STATES:
return "integrator_compact_shadow_states";
case DEVICE_KERNEL_INTEGRATOR_RESET:
return "integrator_reset";
case DEVICE_KERNEL_INTEGRATOR_SHADOW_CATCHER_COUNT_POSSIBLE_SPLITS: