-----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
