Hi,

As fallback for offscreen rendering on computers without GPU I use Mesa3D. 
(http://www.mesa3d.org/brianp/sig97/offscrn.htm) chapter 6.

Everything works great in simple test program, but when I create custom context 
subclassing osg::GraphicsContext and write methods and viewer. OpenSceneGraph 
tells me, that I dont have valid context, even glGetString function fails. 
But when I call makeCurrent manually in simple test prgoram without rendering 
by osg (only few opengl calls), everything works. It seems like linking 
problems within libraries.

Any ideas ?

Thank you!

Cheers,
Filip

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