On Fri, Nov 15, 2002 at 07:45:21AM -0700, Brian Paul wrote:
> Jens Owen wrote:
> > Ian Romanick wrote:
> >
> >> Can I get a quick run-down of the GLX code so that I can know where to
> >> begin?
> >
> >
> > Most of the server side support for GLX proper is in:
> >
> > xc/programs/Xserver/GL/glx
> >
> > This provides the main extension for indirect rendering and interfaces
> > with the "../dri" and another glue piece "../mesa/src/X", I think, to
> > complete the server side support.
> >
> > The client side support is in:
> >
> > xc/lib/GL/glx
>
> That's basically it. If you've got detailed questions I can try to
> answer them. Adding new extensions which just add new enum values
> is pretty simple. Adding new GL/GLX functions is more work since you
> have to implement the GLX encode/decode functions and server-side
> dispatch.
I'm going to implement SGI_swap_control (which adds glXSwapIntervalSGI)
first because implementing it in any of the drivers that supports the vblank
syncing would be trivial. That way 99% of the work in not device dependent.
:) In the R200 driver, the behavior of SGI_swap_control can be added by
changing r200WaitForVBlank to do something like:
if ( rmesa->swap_interval != 0 ) {
vbl.type = DRM_VBLANK_ABSOLUTE;
vbl.sequence = rmesa->vbl_seq + rmesa->swap_interval;
}
else if ( getenv("LIBGL_SYNC_REFRESH") ) {
...
The only catch is that I can find NO documentation of the GLX protocol for
it. Given that, I'm going to implement it for direct rendering contexts
only. I believe that this could be done by either adding a new entry point
to __DriverAPIRec or adding a swap_interval field to __DRIcontextPrivateRec
and adding a DRIswapInterval function to dri_util.c.
I would then fill-in glXSwapIntervalSGI in lib/GL/glx/glxcmds.c to look
either like glXSwapBuffers or glXUseXFont (for their gc->isDirect cases,
anyway).
What needs to be done in programs/Xserver/GL/glx/? How do I get the
extension string exported? This also applies to the
GLX_ARB_get_proc_address string. :)
--
Smile! http://antwrp.gsfc.nasa.gov/apod/ap990315.html
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