Perhaps the problem is that I am doing this before viewer.run()... I'll move the code and see if that fixes my problem.
CD Skylark wrote: > Hello Conan, > > > > I create my gc manually then create viewer/window etc... so my code looks > > like this: > > > > unsigned int contextID = gc.get()->getState()->getContextID() > > unsigned int textureID = texture[0]->getTextureObject(contextID)->id(); > > > > Upon executing the "textureID = " I get a seg fault, and upon further > > checking, texture[0]->getTextureObject(contextID) = 0. > > > > (you don't need gc.get() above, ref_ptr has an overloaded operator-> > that takes care of that for you so you can just do gc->... ) > > As with any pointer access in C++ programming, you have to be sure that > when you do something, you're not dereferencing a null pointer. > > What you're doing is perfectly fine, as long as you do it after the > first frame has rendered. The getTextureObject(...) call will return > NULL before that, because OSG uses lazy initialization to only allocate > objects once they're needed. OpenGL objects and the OSG objects that > hold them are examples of this. > > So the safest way is to just let OSG render one frame, and then you can > get your texture object (for example, check if the result of > getTextureObject() is NULL, if not then get your texture ID, and then do > your thing). > > If you really want to, you can force OSG to allocate all objects in your > scene at startup by doing this: > > viewer->realize(); > viewer->stopThreading(); > > gc->makeCurrent(); > > osgUtil::GLObjectsVisitor glov; > glov.setState(gc->getState()); > viewer->getCamera()->accept(glov); > > gc->releaseContext(); > > viewer->startThreading(); > > Hope this helps, > > J-S > -- > ______________________________________________________ > Jean-Sebastien Guay > http://www.cm-labs.com/ > http://whitestar02.dyndns-web.com/ > _______________________________________________ > osg-users mailing list > > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > ------------------ > Post generated by Mail2Forum ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=43202#43202 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
