Serge, One other item that hasn't been explicitly mentioned yet is pixel packing. You want to make sure that the graphics card does as little with the source image as possible to get it into the OpenGL pipeline. Make sure that your on-disk pixel format is something that is on the fast path. Storing data as 24-bit RGB is not a good choice as it is not aligned. BGRA is your best bet as it is about the fastest pixel format on nvidia hardware.
Chuck On Mar 10, 2010, at 8:43 AM, Robert Osfield 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
_______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
