Thanks for your advices Robert, anyone had some success on configuring and sharing graphic contexts on Windows 7 ? We'll also try the 4 images based on one big image and let you know how it goes.
Cheers, On Wed, Mar 10, 2010 at 5:43 PM, Robert Osfield <robert.osfi...@gmail.com>wrote: > Hi Serge, > > > On Wed, Mar 10, 2010 at 4:29 PM, Serge Lages <serge.la...@gmail.com>wrote: > >> We've tried with only one texture and the fps drops to 15 approximately with >> a modern computer (GeForce card). Maybe the problems comes from having one >> texture shared on 4 contexts and only one card, on the final setup we'll >> have 2 graphic cards. >> > > Do you need 4 contexts? If you have one card I would typically try to run > it with a single context across all outputs. With two graphics cards you > wouldn't be able to do this, but still I'd opt for two graphics contexts, > one per card. This does assume that your OS of choice actually supports > driving the graphics cards efficiently... > > Perhaps one solution you could go for is to have four textures that each > have their own osg::Image, but each osg::Image points to a different point > in the larger osg::Image. If you place render the video as four images > down, one wide, rather than four wide and one down then you'd be able to use > a simple pointer offset into the osg::Image that ffmpeg is writing to. > Using this approach you could avoid major cache misses, and avoid the need > for sharing a single big texture. > > Robert. > > > > _______________________________________________ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > -- Serge Lages http://www.tharsis-software.com
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