glXGetContextIDEXT — get the XID for a context.
glXGetContextIDEXT returns the XID associated with a GLXContext.
No round trip is forced to the server; unlike most X calls that
return a value,
glXGetContextIDEXT does not flush any pending events.
glXGetContextIDEXT is part of the
not part of the core GLX command set. If _glxextstring(EXT_import_context)
is included in the string returned by glXQueryExtensionsString,
when called with argument
EXT_import_context is supported.
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