[Bug 42324] New: Wine selects wrong OpenGL renderer on macOS

[wine-bugs at winehq.org]

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

            Bug ID: 42324
           Summary: Wine selects wrong OpenGL renderer on macOS
           Product: Wine
           Version: 2.0-rc6
          Hardware: x86-64
                OS: Mac OS X
            Status: UNCONFIRMED
          Severity: critical
          Priority: P2
         Component: directx-d3d
          Assignee: wine-bugs at winehq.org
          Reporter: f.platte at platte-web.de

Created attachment 57072
  --> https://bugs.winehq.org/attachment.cgi?id=57072
example images

I'm using a 13 inch 2012 MacBook Pro with a Thunderbolt eGPU (GTX 750Ti). Due
to macOS limitations the the eGPU can only accelerate the external monitor.
(Some application which support selecting a renderer work on the internal
display. e.g openglex4 [OpenGL Extensions Viewer]). To my knowledge the macOS
applications else always use the renderer driving the screen where they are
launched on. However wine does not respect this behaviour.

I tried running several windows executables like the benchmark tools Valley and
Heaven which keep using the Mac's internal Intel HD4000 graphics although being
used on the external screen. I tried several wine engines from the staging,
stable and development tree, which all are affected. To check wether it might
be an OS related issue I also ran the Mac-native versions of the benchmarks
mentioned above which both worked as expected (using the OpenGL renderer
driving the monitor they are launched on).

This basically breaks games and other GPU heavy windows programs in my case. I
do not know whether hackintoshes are affected as well as they basically are the
only other macOS machines having integrated and dedicated GPU driving different
monitors.

The logical solution seems to be to make wine respect the way macOS assigns
renderer while an ideal solution would be implementing a way to select a
renderer/always default to the dedicated GPU as this would enable accelerating
the internal monitor with the external GPU like it's possible with windows.

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