[osg-users] glew and graphics contexts

Wills Alan AWILLS at qinetiq.com
Thu Oct 18 09:12:12 PDT 2007


If I have the following ...
 
// ..create traits ...
osg::GraphicsContext* gc = osg::GraphicsContext::createGraphicsContext(traits);
gc->realize();
gc->makeCurrent();
 
GLenum err = glewInit();
 
if (err != GL_OK)
    // error msg.
else
    // ok
 
... then all is well.  But if I do ...
 
osgViewer::Viewer viewer.
viewer.setUpViewOnSingleScreen(0);
viewer.realize();
 
GLenum err = glewInit();
 
if (err != GL_OK)
    // error msg.
else
    // ok
 
I get an error:  "Missing GL version"
 
I'm checking the viewer's graphics context by doing
 
std::vector<osg::GraphicsContext*> contexts;
viewer->getContexts(contexts);
 
with results:
contexts.size() = 1;
contexts[0]->isRealized() = 1;
contexts[0]->isCurrent() = 1;
 
but glewInit() returns an error.  What have I missed?
 
Thanks,
Alan.
 

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