> [...]
> > Xinerama _does_ support open GL, at least with my matrox card, I can
have
> > openGL on one monitor of the two. That is a
limitation of the card
> > hardware, AFAIK, not of X.
>
> I doubt this is a hardware limitation. The hardware just renders to AGP
or
local memory.
I may be wrong though...
IIRC Matrox cards have a way of making a single framebuffer (with xinerama
hints) that appears on two monitors. That way you should get 3d accel on
both displays.
Using a single framebuffer for both outputs should be possibble by setting
the
correct pitch (add with of other screen as padding) and start address I
think.
This would require both screens to have the same framebuffer confiuration,
i.e. pixel format.
--ms