Please get Xinerama working with OpenGL acceleration. While vendors such as NVidia have built proprietary (twinview) solutions for the dual-head problem, there are folks who'd find 3D-acceleration across multiple video boards useful. Other X implementations of Xinerama (such as Sun's IIRC) support accelerated 3D. Taken together with the DMX extension, this could be a HUGE win in terms of visualization, CAD/CAM, UT2004, etc..
once hw accelerated indirect rendering works this should just work with glxproxy and dmx.
I would find this very useful, myself. I wish I could run OpenGL across more than two monitors (using the nVidia trick).
BTW - Sun's Xinerama implementation in the Xsun server is not that different from that in Xorg. The difference is that the Sun OpenGL team extended Sun's OpenGL to support Xinerama mode with hardware acceleration. (Unfortunately, they're a different team from our X group, with sources encumbered by various licenses so I can't offer back their changes to that.)
because the DRI is capable of accelerating GL on multiple heterogeneous heads at once, it's really really hard to integrate that with GL. so the options look like: - MergedFB for the single-card, multiple head case, which fakes Xinerama geometry information while still enabling DRI - Xdmx with accelerated indirect GLX, which is a work in progress (bug #4988) fixing this within the DRI is probably not going to happen.
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