BabylonJS
Main thread is blocked when rendering for Playground app on macOS and iOS
The playground app on macOS and iOS:
https://github.com/BabylonJS/BabylonNative/blob/a02f821a2cae1c935377f7074e456dbb63de8dee/Apps/Playground/iOS/LibNativeBridge.mm#L105-L112
https://github.com/BabylonJS/BabylonNative/blob/76e5ba1ee58fb4ed10ae72de0a3253e434f09686/Apps/Playground/macOS/ViewController.mm#L39-L44
The code is currently calling FinishRenderingCurrentFrame immediately following StartRenderingCurrentFrame. FinishedRenderingCurrentFrame will immediately block waiting for the JS thread to finish doing its part. Ideally, these calls should be backwards. StartRenderingCurrentFrame should be called as soon as possible and FinishRenderingCurrentFrame should be called as late as possible. There should be a small gap between FinishRenderingCurrentFrame and the next StartRenderingCurrentFrame.
Oddly, the validation tests for macOS and iOS does it correctly:
https://github.com/BabylonJS/BabylonNative/blob/a02f821a2cae1c935377f7074e456dbb63de8dee/Apps/ValidationTests/iOS/LibNativeBridge.mm#L87-L93
https://github.com/BabylonJS/BabylonNative/blob/a02f821a2cae1c935377f7074e456dbb63de8dee/Apps/ValidationTests/macOS/ViewController.mm#L36-L41
This is a resize issue because RenderTarget and other resources are still being used while resize occurs. Issue doesn't appear with VT because there is no resize allowed there.
