1991-2006 Silicon Graphics, Inc.
glXGetContextIDEXT 3G
glXGetContextIDEXT get the XID for a context.

## C Specification

GLXContextID `glXGetContextIDEXT` const GLXContext ctx

## Parameters

ctx

  Specifies a GLX rendering context.

## Description

`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 `GLX_EXT_import_context` extension, not part of the core GLX command set. If `GLX_EXT_import_context` is included in the string returned by glXQueryExtensionsString, the extension is supported.

## Errors

`None` is returned if ctx is `NULL`. Otherwise, if ctx does not refer to a valid context, undefined behavior results.

## See Also

glXCreateContext, glXQueryVersion, glXQueryExtensionsString

## Copyright

Copyright 1991-2006 Silicon Graphics, Inc. This document is licensed under the SGI Free Software B License. For details, see http://oss.sgi.com/projects/FreeB/.