Hi Jan, I ve got a question, if you can help. Do I have to do some mods in the app to support SLI ?
Thanks ! Nick http://www.linkedin.com/in/tnick On Tue, Jan 26, 2010 at 5:25 PM, Jan Ciger <jan.ci...@gmail.com> wrote: > -----BEGIN PGP SIGNED MESSAGE----- > Hash: SHA1 > > On 2010-01-26 15:05, Trajce Nikolov wrote: > > Hi Robert, > > > >> To share the data of the RTT card you'll need to use a double buffered > > PBO to copy the data back to main memory and then to copy back to the > > GPU's that need to use it. > > > > if this is the only way of doing it, could point me to some details ? > > > > Actually, careful here. > > SLI means that your 4 cards are linked on the hardware level and the > driver presents only ONE logical card to the higher level software > (OpenGL). Essentially the hardware uses each card to render a portion of > the frame (SFR mode) or alternating frames (AFR mode) or to perform > antialiasing. The load balancing is all done in the driver and hardware, > the userspace has no control whatsoever over it. In this case you cannot > do what you want. > > If you do not turn SLI on (do not install the hw bridges and disable the > option in the driver) and only install the 4 cards in the machine, then > you have 4 separate heads. However, then you are on your own with > regards to creation of contexts and moving data between cards. It will > be also very likely slow, because the main bus will be used instead of > the dedicated SLI interconnects. > > Regards, > > Jan > -----BEGIN PGP SIGNATURE----- > Version: GnuPG v1.4.10 (GNU/Linux) > Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ > > iD8DBQFLXwlJn11XseNj94gRAilHAJwPs559ZiW2YNiNczbwJyqB5kk99gCdGfOq > zJ82Zwplm8ti0m1VXbcXb20= > =oWuO > -----END PGP SIGNATURE----- > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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