[Bug 14767] WGL_SWAP_METHOD_ARB attribute not implemented

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=14767





--- Comment #4 from Alexander Sabourenkov <screwdriver at lxnt.info>  2008-08-15 01:16:56 ---
(In reply to comment #3)
> They should prove that WGL_SWAP_UNDEFINED_ARB is a reasonable default value.

The value is reasonable because it allows the least amount of assumptions about
buffer contents after a swap. Namely, that they're undefined. However, after
some discussion in wine-patch list, I revised this patch to use corresponding
GLX extension and to use the information in pixel/fbformat selection. 

> I'm not sure what the best way to right that test is.

I was more concerned with that I found no tests for winex11drv.  Having at
least one I would have something to model my tests on, but without any I'm at a
loss what to do. I need examples.

> Slightly offtopic I noticed (on the Mesa list to which I'm not subscribed) that
> you looked at this missing feature was because you are experiencing image
> corruption in Sketchup and other OpenGL apps and thought this might be related.
> 

[...]

>
> This same functionality is also needed to render e.g. a glxgears window on one
> of the faces of a Compiz cube.
> 

Many thanks for the insights. There is something fishy going on with offscreen
buffers in free drivers and that would be my next area of investigation. Again,
many thanks for this most informative comment.


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