[Bug 34398] Daedalic games don't display anything with winemac.drv

[wine-bugs at winehq.org]

http://bugs.winehq.org/show_bug.cgi?id=34398

--- Comment #6 from thanoulas <thanoulas at gmail.com> 2013-10-08 18:03:52 CDT ---
Ok, found this in the OpenGL implementation of glxChooseFBConfig:

GLX_DEPTH_SIZE
Must be followed by a nonnegative minimum size specification. If this value is
zero, frame buffer configurations with no depth buffer are preferred.
Otherwise, the largest available depth buffer of at least the minimum size is
preferred. The default value is 0.

http://www.opengl.org/sdk/docs/man2/xhtml/glXChooseFBConfig.xml

>From my (little) understanding of the source code, the X11 driver is using
glxChooseFBConfig, where the mac driver has its own selection routine. The
problem is that glxChooseFBConfig is going to return the "largest available
depth buffer of at least the minimum size", so since the largest one is 24bit
(and not 16bit), this is why it returns that FBConfig. Winemac on the other
hand, returns the best match, which is exactly what was requested. This may (or
may not) be the cause of this issue, as I guess the expected behaviour is to
get the largest depth size.

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