Hi, as I mentioned somewhere else, we are also thinking about a shader composition concept. After some consideration we came to the conclusion, that shader linking is probably the most time-effective approach. So we would go with Wojtek and use his VirtualProgram - extending and implementing it. In combination with a clean shader implementation of the FFP you can activate/deactivate FFP-functionality by linking an empty dummy-function or a fully implemented function. These FFP-functionalities could also be used in own shadercode - just use the (ie osg_fog-)function in your own code. OSG will link it, when fog is activated and unlink (read: link empty function), when fog is deactivated. The linking itself should be much faster than generating some shadercode on runtime (even with caching). Using empty functions as "not-active"-dummys may sound like overhead, but calling a (empty) function didn't cost any measurable time when we tested it. Linking/Unlinking and updating needed uniforms could be implemented in osg::State ie through the mentioned shadercompositor-interface. ...
Cheers, Johannes ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=29409#29409 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
