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http://oss.sgi.com/projects/ogl-sample/registry/EXT/import_context.txt
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GLX_SHARE_CONTEXT_EXT 0x800A
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GLX_VISUAL_ID_EXT 0x800B
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void glXFreeContextEXT (Display* dpy, GLXContext context)
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GLXContextID glXGetContextIDEXT (const GLXContext context)
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GLXContext glXImportContextEXT (Display* dpy, GLXContextID contextID)
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int glXQueryContextInfoEXT (Display* dpy, GLXContext context, int attribute,int *value)
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typedef XID GLXContextID