Hi Max, The topic of mixing OpenGL code with the OSG has been discussed many times on osg-users so have a look through the archives on this topic. glPushAttrib would also be a good keyword to search on.
Robert. On Fri, Sep 5, 2008 at 6:42 PM, Max Pfingsthorn <[EMAIL PROTECTED]> wrote: > Hello Robert, > > Thank you very much for your reply. > > My thoughts exactly. But how do I save and restore the opengl state in its > entirety? I tried pushing/popping the modelview, projection and even the > texture matrices around calling viewer->frame(). I also explicitly glGet'ed > them and loaded them again after OSG was done in case push/pops were not > matched properly inside OSG. > > What else is there to save in the opengl state? > > Best regards, > Max Pfingsthorn > > On 5 Sep 2008, at 17:40, "Robert Osfield" <[EMAIL PROTECTED]> wrote: > >> Hi Max, >> >> My guess is that Qt is changing OpenGL state which is not being >> protected, and then you are mixing this with the OSG which assumes >> that it has complete control over OpenGL state so gets messed up by >> the QT changes to state, and also Qt OpenGL code is likely to be >> messed up by the OSG changing state. >> >> I don't know enough about the Qt's implementation here to really >> provide my insight. Personally I'd rather keep Qt doing Windowing and >> the OSG doing OpenGL. If you want to mix things then you'll need to >> start playing games with push and popping OpenGL state when entering >> the Qt OpenGl code path, and also resetting OpenGL state after leaving >> the OSG section. >> >> Robert. >> >> On Fri, Sep 5, 2008 at 4:16 PM, Max Pfingsthorn >> <[EMAIL PROTECTED]> wrote: >>> >>> Dear users, >>> >>> this problem has been with me for a while. I've even tried it with other >>> graphics engines (Ogre) to no avail. >>> >>> As shown in this toy project at Trolltech Labs >>> >>> >>> http://labs.trolltech.com/blogs/2008/06/27/accelerate-your-widgets-with-opengl/ >>> >>> I would like to show a scene in the background of a QGraphicsView and I >>> was very happy that the ViewerQT class already was a QGLWidget. However, >>> there seems to be something scaled wrong after I call viewer->frame(). >>> >>> Attached are a few screenshots and the code I have so far. I'm currently >>> running Ubuntu 8.04.1 and I'm using the OSG 2.2 binaries that came with >>> it. Beware that you need at least Qt 4.4 to compile this code. >>> >>> qt-osg-1.png and -2.png show how far I am at the moment. Number 2 shows >>> the problem with scaling the window. OSG shows the scene fine in the >>> background, but the widget I'd like to overlay is stretched. I believe >>> the OpenGL version of QPainter draws in some normalized coordinates and >>> the bounding box isn't properly updated. qt-osg-ok-1.png and -2.png show >>> the same window sizes without calling viewer->frame(), and the scaling >>> of the widget is ok. Just no scene in the background of course. >>> >>> I've traced the problem to osgViewer::Renderer::cull_draw(). I believe, >>> when the geometry of the view is set, something makes Qt stop drawing >>> correctly. >>> >>> In the function which calls viewer->frame() (in >>> osgGraphicsView::drawBackground), I thought I save any sort of relevant >>> OpenGL state, the projection matrix, model/view matrix, and even the >>> texture matrix. After the call the viewer->frame(), I restore them >>> again. Is there any other state that I might have overlooked which is >>> set in the renderer? Also, do you have any idea why the Qt widget is not >>> drawn entirely sometimes? Could it have something do to with buffer >>> swaps? >>> >>> Thank you all for your help in advance! >>> >>> Best regards, >>> Max Pfingsthorn >>> >>> _______________________________________________ >>> 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 > > _______________________________________________ > 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
