[HTML5] Move audio processing to thread when threads are enabled. #42505
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This should fix some of the audio stuttering issues when the HTML5 export is compiled with threads support.
The API should be ported to AudioWorklet to (hopefully) be perfect.
That though, cannot be backported to 3.2 due to extra restriction of AudioWorklet (which only runs in SecureContext, and needs a polyfill for Safari).
The driver interface has been ported to an emscripten library (instead of
*EM_ASM
s) to make it more maintainable and take advantage of emscripten's synchronization features.This PR also includes 2 small enhancements:
.threads
suffix to the JavaScript thread build (so they don't override each other).This could probably be cherry-picked to
3.2
.