[Dri-devel] Re: [Mesa3d-dev] Mesa 3.4.2 in XFree86 4.2.0 OpenGL support

[Mike A. H. <mh...@re...>]

On Tue, 26 Feb 2002, Brian Paul wrote:

>> what I understood, 3.3.6 doesn't use GLX, which is why it didn't
>> work.  I'm not quite clear on all of this however, so please
>> correct me if I'm wrong.
>
>Hi Mike,
>
>Sorry for not replying sooner.  XFree86 4.2 does not support libGL
>rendering to 3.3.6 servers.

No prob, I thought my message to you must have got killed by a 
one of my frequent VPN outages.  ;o)


>The option we're talking about is the 'GlxBuiltInXMesa' token seen
>in xc/lib/GL/Imakefile.  If this token is defined, Mesa and its Xlib
>driver will be built into libGL so that if the target server doesn't
>support the GLX extension, we'll fall back to Mesa rendering with
>Xlib calls.
>
>This option is on the DRI trunk now and should wind up in XFree86 4.3.
>It's not enabled by default.  I should do a test build with it enabled
>to be sure it's still working.  It's been many months since I touched
>that code.
>
>If you'd like this feature for Red Hat Linux before XFree86 4.3 is released,
>it might not be too hard to move the xc/lib/GL code from the DRI trunk
>onto a XFree86 4.2 tree.

Hmm, that's a bit more experimental of a codepath than I can 
probably get away with, although DRI trunk would be nice for 
gamers for sure most likely.  ;o)

How difficult would it be for me to backport the necessary 
changes to 3.4.2?  What part of the code should I look at?  I'm 
not too familiar with the current codebase in DRI CVS.

In the worst case, I can revert back to our horrible hack of 
using the external Mesa patched with DRI support.  I just wanted 
to explore all sane possibilities first to avoid our current 
insanity.  ;o)

Thanks Brian,
TTYL



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