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OpenGL How can setpixelformat() fail?

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Hi all, Someone is using my application I wrote with opengl. They say my app fails when SetPixelFormat() is called. They are using a Matrox millennium g550 card (I have never heard of this manufacturer). My app runs fine with nVidia/ATI cards. Any ideas why this would fail? Thanks

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This need not be the problem, but matrox cards normally don't have hardware acceleration for 3D graphics. Perhaps it has no software OpenGL implementation either and the function fails on PFD_SUPPORT_OPENGL part of the request.

Tom

EDIT: nevermind, I don't think this is true at all. They even seem to be on the OpenGL ARB :)

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