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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