[Bug 42324] Wine selects wrong OpenGL renderer on macOS

[wine-bugs at winehq.org]

https://bugs.winehq.org/show_bug.cgi?id=42324

--- Comment #12 from Ken Thomases <ken at codeweavers.com> ---
Created attachment 57133
  --> https://bugs.winehq.org/attachment.cgi?id=57133
Patch to restrict pixel formats for multi-renderer systems

(In reply to Rastafabi from comment #11)
> Any thoughts on this one?
> I think, that windows programs using should reflect the behaviour of the
> native applications, although it might not be 100% conform with official
> development guidelines (concerning the re-querys).

As I've said, the Mac driver sets up its OpenGL contexts so that they should
automatically track the appropriate GPU.

> Especially as while this
> underlyingly seems to work with the nativ OpenGL programs concerning their
> score it heavily degrades the experience as the UI driven on the screen
> actually does not reflect these theoretical behaviour, but makes the GL
> animation (after some second with a black window only) being rendered more
> like a slight show, even if moved to the more powerful external GPU.

It's nearly impossible to debug something like this without being able to
reproduce it myself.  Unfortunately, I don't have a system with an external GPU
with which to test.

I'm attaching a patch which probably won't make any difference but might help. 
You can give it a try and see.

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