Age | Commit message (Collapse) | Author |
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In our previous attempts to fix the lightmapper we may have
inadvertently introduced the same issue we were trying to fix. It
appears that rand() will on some platforms introduce a mutex making it
slower and on others may have a per-thread state that would need to be
initialized with srand() on each thread. This slows down the lightbaking
further.
This sets up a separate rng state for each OpenMP thread by calling
rand() only in the single-threaded part of the code. We then keep a
vector of states.
I believe this solves our problems.
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Sorry for the churn
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Add several unlikely() macros
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Use a more naive RNG for the lightmapper
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Based off of perf-based prediction misses these seem to be the
lowest-hanging fruit for quick (albeit small) improvements. These are
based on:
* baking a complex lightmap
* running platformer 3d
* running goltorus
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On higher threadcount systems this allows for better utilization. On my
16 thread box CPU use goes from 10 - 11 threads to a steady 15 threads
on the Sponza scene.
Baking time goes from ~10:00 to ~07:30 for me. On lower threadcount
systems I expect some improvement also but likely a little less.
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This speeds up the lightmapper by about 10% with no visible impact. A
comparison is up here:
https://tmm.cx/nextcloud/s/Log1eAXen1dJzBz
AMD Ryzen 7 1700 Eight-Core Processor
Sponza scene
pcg32
256/256/high 00:10:13
256/256/medium 00:02:50
256/256/low 00:01:11
xorshift
256/256/high 00:09:32
256/256/medium 00:02:34
256/256/low 00:01:05
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also changed two calls that were ambiguous
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-Fixes to unwrapper (remove degenerates), makes Thekla not crash
-Added optional cancel button in EditorProgress
-Added function to force processing of events (needed for cancel button)
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