Moved VBO switching code into inline methods into osg::State to speed performance

src/osgViewer/CompositeViewer.cpp

@@ -224,6 +224,8 @@ struct CompositeViewerCompileOperation : public osg::Operation
         // OpenThreads::ScopedLock<OpenThreads::Mutex> lock(mutex);
         // osg::notify(osg::NOTICE)<<"Compile "<<context<<" "<<OpenThreads::Thread::CurrentThread()<<std::endl;
 
+        context->getState()->initializeExtensionProcs();
+
         osgUtil::GLObjectsVisitor compileVisitor;
         compileVisitor.setState(context->getState());