[Bug 52354] winemac.drv not functional on non metal GPUs

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=52354

--- Comment #30 from Charles Davis <cdavis5x at gmail.com> ---
(In reply to Gcenx from comment #29)
> (In reply to Charles Davis from comment #28)
> > (In reply to Gcenx from comment #27)
> > > Gotten chance to try playing some games it’s a bust for anything fullscreen.
> > > 
> > > Total Annihilation black screen, forcing windows mode works
> > > 
> > > Red Alert2 back screen when fullscreen, also tried cnc-ddraw it loaded the
> > > menu but after selecting skirmish nothing until I try to load the menu. The
> > > menu to exit loaded but not the actual game.
> > > 
> > > So seems there’s still work to be done.
> > 
> > /me facepalms
> > 
> > *Now* I remember. I tried using layer-hosting views everywhere at first, but
> > it didn't work right with OpenGL--the GL surface doesn't get created
> > properly or something. Using layer-backed views made it work again.
> 
> So does that mean falling back to the older functionally for 10.13 and below
> and using the newer backend on 10.14+?

Possibly.

Another possibility is simply removing the layer from the view at
wglMakeCurrent() time. Though I don't know how well removing the hosted layer
once set would work. And if the process draws with both GDI and GL...

The other possibility--which we will need for cross-process GL--is setting up a
layer as the default GL drawable. While there is a CAOpenGLLayer, it has
several restrictions that make it unsuitable for our use: in particular, it
does all GL context and drawable management itself, so you can only draw in its
-drawInCGLContext:pixelFormat:forLayerTime:displayTime: method.

We'll have to implement our own OpenGLLayer, using IOSurfaces as the drawables,
with hooks in glDrawBuffer[s]() to redirect handling of the built-in
framebuffer to our IOSurfaces. This will be very complicated, and I'm not
looking forward to this. Ah, who am I kidding? I'm totally looking forward to
this. I like a good challenge.

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