[Xquartz-dev] 2.3.3_rc1

[Jeremy Huddleston]

On Mar 10, 2009, at 12:31, Jeremy Huddleston wrote:

> BTW, one more point I just want to clarify.  Are you certain that  
> the version of vmd-xplor on all machines is identical and that they  
> are all linking against the libGL in /usr/X11/lib/libGL.dylib?
>
> You're good about that sort of thing, but I just wanted to be  
> explicit since it might be possible to link against a Mesa libGL if  
> it was built with MacPorts or Fink or some other package system.
>
> Also, as for dropping down to software rendering goes, I added  
> support for two environment variables: LIBGL_ALWAYS_HARDWARE and  
> LIBGL_ALWAYS_SOFTWARE.  See http://xquartz.macosforge.org/trac/changeset/304

Now that I look at this some more, I think there are still some bits  
missing.  The GLcontextMode that we're passed in  
apple_visual_create_pfobj may actually be a SW-only mode, and by  
forcing kCGLPFAAccelerated, kCGLPFAClosestPolicy in the attribs, we're  
not going to get the actual mode requested but a similar fit.  We  
probably need to add some bits to filter the visuals and fbconfigs  
based on LIBGL_ALWAYS_SOFTWARE as well.

But the lib that I sent you should still work at forcing HW or SW...  
you will just get a "close" rather than "exact" match for the visual.

As George mentioned, try using the LIBGL_DUMP_VISUALID environment  
variable to see what visuals are being used for your HW and SW renderer.

--Jeremy