Hi, I'm currently walking down the oft-treaded path of creating Qt Widget overlays on top of an OSG scene. I've been doing a lot of reading and searching over the archives, and it seems like there are 2 main approaches. Eveything I can find on the topic is 3-5 years old, however, so I was wondering if I'd missed anything.
The first approach is to use osgQT::QWidgetImage to render the QWidgets to a texture and display that within the OSG scene. I've gotten that working, with a little bit of sub-classing to make a full-screen ortho projection work to create a HUD and to handle events properly. There is a bit of wonkiness to it though so I also want to try... The second approach: to use a QGraphicsScene and to do the osg rendering in the drawBackground method. I'm currently trying to get this approach to work, but running into some issues. I've gathered, from the archives, that I need to save the openGL state at the beginning, then restore it once finished with the osg rendering, but I'm not sure exactly what the osg rendering consists of. I tried calling frame() on an osgviewer from there, but got a fistfull of openGL errors > QGLContext::makeCurrent(): Failed. > QGLShader: could not create shader > Vertex shader for simpleShaderProg (MainVertexShader & > PositionOnlyVertexShader) failed to compile > QGLShader: could not create shader > Fragment shader for simpleShaderProg (MainFragmentShader & > ShockingPinkSrcFragmentShader) failed to compile > QGLShaderProgram: could not create shader program > Errors linking simple shader: "" > QGLShader: could not create shader > Vertex shader for blitShaderProg (MainWithTexCoordsVertexShader & > UntransformedPositionVertexShader) failed to compile > QGLShader: could not create shader > Fragment shader for blitShaderProg (MainFragmentShader & > ImageSrcFragmentShader) failed to compile > QGLShaderProgram: could not create shader program > Errors linking blit shader: "" > QGLContext::makeCurrent(): Failed. Maybe I am just setting things up wrong? I have a QWidget that creates a QGraphicsView and an osgViewer::Viewer. I set the viewport of the GraphicsView to be the GLWidget from the Viewer's graphicsWindow.getGLWidget(). I subclassed the QGraphicsScene to give it a pointer to the viewer, and in the drawBackground method I saved off the openGL state, called frame() on the viewer, and restored the state, but the window doesn't render and gives me those errors. Has anyone had success with this? And if so, has anyone gotten it to work with anything other than a single-threaded approach? ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=60822#60822 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
