Render pass descriptor cache for Metal #2264
Merged
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Includes #2260Fixes two of the performance issues in #2161 (RP desc locking and copying costs).
Immediate recording FPS doesn't seem to change, maybe slightly lower (touching 90 from below more than from above, as I recall it doing - need to confirm. Edit - confirmed to not be caused by the PR).
Deferred recording FPS seem to go from lower 100s to higher, or even from 100 to 110, roughly speaking. There are barely any bottlenecks left for it, outside of the general architecture. Main thread now spends about 14.5% in our code, which is mostly covered by driver interaction.
PR checklist:
make
succeeds (on *nix)make reftests
succeedsrustfmt
run on changed code