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From what I heard, Apple‘s OpenGL driver had a lot of bugs & issues, now that they kind of re-built it as a wrapper, did they they care to replicate the bugs as well? If not I would assume that some Apps might not work with this new wrapper or maybe some even get perf boosts. Or am I understanding things wrong?

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From what I'm seeing with my own GL code (fairly basic GL 3.2 stuff), the actual GL implementation is quite ok, but utility classes like NSOpenGLView have been a bit hit and miss in recent years.

I would expect though that their new GL-on-Metal thing is a bug-for-bug compatibility layer for existing applications, otherwise it wouldn't make much sense because new apps shouldn't use GL anyway.

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