[osg-users] Extension '' is not supported

[Robert Osfield]

I traced it back to a line in SceneGraph.cpp's SceneView::init():

    // force the initialization of the OpenGL extension string
    // to try and work around a Windows NVidia driver bug circa Oct 2006.
    osg::isGLExtensionSupported(_renderInfo.getState()->getContextID(),"");

So the confirms that the issue is benign, and I think given it's 12 years
on that there have been lots of other changes to the osg::State &
GLExtensions are setup it's probably safe to remove - there are lots of
other extensions being checked prior to the "" ones.  I will check in
removal of this call to OSG-3.6 branch and master.

Robert.
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