Hi
have a look at osg::State interface, there are functions to tell osg that
something was changed in gl state externally.
Cheers.
25.03.2013, 15:28, "Peter Klosowski" <klo...@gmail.com>:
> Hi,
>
> I am working on a small application that uses SFML and OSG. Getting a simple
> viewer up and running was very easy. In fact, most of my code is based on the
> osgviewerSDL example. However, there is one significant difference which is
> causing problems:
>
> SFML provides its own graphics module which uses OpenGL. This means that the
> OpenGL state will get modified outside of OSG. This seems to cause problems,
> for example it looks like OSG thinks that certain
> VertexAttribArray/VertexAttribPointer settings are still active. How can I
> tell OSG to reapply these settings each frame instead of caching them?
>
> The problem can be demonstrated with a simple render loop, like this:
>
> Code:
>
> static const int windowWidth = 800;
> static const int windowHeight = 600;
>
> sf::RenderWindow window;
> sf::VideoMode mode = sf::VideoMode::getDesktopMode();
>
> mode.width = windowWidth;
> mode.height = windowHeight;
>
> sf::ContextSettings settings(24, 8, 0, 4, 2);
>
> window.create(mode, "SFMLTest", sf::Style::Default, settings);
>
> osg::ref_ptr<osg::Group> root = new osg::Group;
>
> /* Create scene... */
>
> osgViewer::Viewer viewer;
> osg::ref_ptr<osgViewer::GraphicsWindowEmbedded> gw =
> viewer.setUpViewerAsEmbeddedInWindow(0, 0, windowWidth, windowHeight);
> viewer.setCameraManipulator(new osgGA::TrackballManipulator);
> viewer.setSceneData(root.get());
> viewer.realize();
>
> auto state = gw->getState();
> state->setUseModelViewAndProjectionUniforms(true);
> state->setUseVertexAttributeAliasing(true);
>
> while (window.isOpen())
> {
> sf::Event event;
> while (window.pollEvent(event))
> {
> switch(event.type)
> {
> case sf::Event::Closed:
> window.close();
> break;
> }
> }
>
> window.setActive();
>
> window.pushGLStates();
>
> viewer.frame();
>
> window.popGLStates();
>
> window.display();
> }
>
> Removing the pushGLStates/popGLStates solves the problem. However, this is
> not a viable long term solution, since the context could be modified in
> between two frames.
>
> Cheers,
> Peter[/code]
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=52941#52941
>
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