META WIP even less stable and more experimental changes to studio model tracking #543
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also comment on the upcoming submodel caching plans
Basically go through all sequences and bones, and try to find out whether a given submodel is affected by animation frames.
Detect whether studio model has changed, and replace it with a new one. It does (as predicted) run into a gpu sync issue if reuse happened while previous frame with the old user is still being drawn.
Gives out individual render submodels for dynamic ones, receives and remembers them when they are not needed anymore. Stores only one render submodel for static ones. Reuses/instantiates it for everyone.
Add render refcount to submodels to diagnose when it can't properly clear things due to them being used somewhere still.
Also add `speeds.submodels_cache_{dynamic,static}` counters to show how many submodels render models have been allocated.
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speeds.counters for cache size