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Macos OpenGL: multiple instances clash #1080
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When using NanoVG+OpenGL on mac, multiple instances can clash, like in the following video:
2x_OpenGL_clash_on_mac.mov
The apple docs are abysmal but from discussions it sounds like it depends on whether the instances are on the same thread or not.
https://stackoverflow.com/questions/2952156/determing-if-an-nsopenglview-has-a-valid-context-cocoa-osx
https://stackoverflow.com/questions/21798018/nsopenglcontext-destroying-textures-of-another-context
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