Detect if OpenGL is present/works?

BlitzMax Forums/BlitzMax Beginners Area/Detect if OpenGL is present/works?

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that's the sort of thing I meant. I wonder if there's ever a system where it can't drop back to software mode when OpenGL is enabled. Basically I don't users to switch on OpenGL, have the game bomb, and then not be able to get back in without editing an .ini file to change back to DirectX.