On Tue, September 26, 2006 4:56 pm, David Reveman wrote: > On Mon, 2006-09-25 at 18:18 -0700, Soup Laddy wrote: > >> Something I've been worried about: I have an nVidia GeForce FX 5500 >> card, and I'd been noticing some extreme tearing in XGL when >> rotating/manipulating the cube and moving around windows... a somewhat >> of a fix to that was to start XGL with __GL_SYNC_TO_VBLANK=1 ... but >> that then reduced performance. Is the tearing problem at all resolved >> with Compiz + AIGLX? > > Both xgl and aiglx implement indirect GL rendering. Hence all blits and > buffer swaps are done on the server side. If you force the driver to sync > to vblank (e.g. __GL_SYNC_TO_VBLANK), you usually force the server to > block and wait for the vblank. You get horrible performance this way as > this leaves the server very little time to process other X requests. I > have a patch that makes it possible for xgl to do buffer swaps in a > separate thread, hence making sure the main thread that is processing X > requests isn't blocked. However, last time I checked, there were no > drivers that could handle GL drawing from multiple threads to one drawable > properly. > > nvidia's new driver with GLX_EXT_tfp, support direct rendering. When using > this driver with direct rendering all blits and buffer swaps are done on > the client side by compiz itself. Blocking and waiting for vblank in > compiz will not stop the server from continuing to process X requests so > there's no performance impact on the server. The compiz code for doing > this is already in head and if you use the new nvidia driver with direct > rendering it should be turned on by default. There's a sync_to_vblank > option which allow you turn it off. Don't use __GL_SYNC_TO_VBLANK, compiz > is using GLX_SGI_video_sync to sync even partial screen updates to vblank. > > > -David > > > _______________________________________________ > compiz mailing list [email protected] > http://lists.freedesktop.org/mailman/listinfo/compiz > >
Does nvidia even use aiglx? doesn't nvidia have it's own accelerated indirect rendering architecture? -anders _______________________________________________ compiz mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/compiz
