Hi Wojtek, I took a look at the apply method and I think an improvement would be to do the shader "fusion" on a text level and then work with the standard osg constructs. It is on my list for this week so I will post the results
-Nick On Mon, Feb 15, 2010 at 12:34 PM, Wojciech Lewandowski < [email protected]> wrote: > Hi Nick, > > I am curious whether this slowdown is due to CPU work (scanning shader maps > and selecting used ones) or GPU work (shaders are recompiled or linked too > often). Do you have any profiling data to share ? > > I do expect some performance degredation while using it vs standard > osg::program. Thats related to active shader selection process in > Virtual::Program apply. I expect this could become nasty when one uses a lot > of virtual programs with many shader changing frequently. > > Lets say that VirtualProgram in current candidate release was mainly > intended as working functional prototype. I expected that implementing this > functionality in target osg version would also require some modifications > and optimizations to program state handling and few modifications to speed > it up by caching last used set of shaders and programs. > > Cheers, > Wojtek > > ----- Original Message ----- > > *From:* Trajce Nikolov <[email protected]> > *To:* OpenSceneGraph Users <[email protected]> > *Sent:* Friday, February 12, 2010 10:30 AM > *Subject:* [osg-users] osgCandidate::VirtualProgram performance > > Hi, > > I am using this in my app and facing really performance problems. When I > replace it with osg::Program and Shaders, it is a huge difference. Like from > 30Hz to 100Hz. Any ideas why it is so slow ? > > > -Nick > > ------------------------------ > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > >
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