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Update RetroPlayer's Render Manager documentation #13341
This adds some documentation to RPRenderManager.
Motivation and Context
I wrote this back in November of last year, but was waiting for a RetroPlayer PR to include this in to reduce GitHub noise. Apparently there's been no RetroPlayer issues that warranted a PR, so I might as well get this in now.
@garbear btw: you know that RP's rendering path is very very very inefficient? iirc you took the code from picture renderer which works without things like PBO (or equivalent on Win) and as a result it syncs CPU and CPU on every frame. For video this is no-go.