1991-2006
Silicon Graphics, Inc.
glXImportContextEXT
3G

# glXImportContextEXT

import another process's indirect rendering context.

## C Specification

                    GLXContext glXImportContextEXT
                    Display * dpy
                    GLXContextID contextID

## Parameters

`dpy`

  Specifies the connection to the X server.

`contextID`

  Specifies a GLX rendering context.

## Description

`glXImportContextEXT` creates a GLXContext given the XID of an existing GLXContext. It may be used in place of glXCreateContext, to share another process's indirect rendering context.

Only the server-side context information can be shared between X clients; client-side state, such as pixel storage modes, cannot be shared. Thus, `glXImportContextEXT` must allocate memory to store client-side information. This memory is freed by calling glXFreeContextEXT.

This call does not create a new XID. It merely makes an existing object available to the importing client (Display *). Like any XID, it goes away when the creating client drops its connection or the ID is explicitly deleted. Note that this is when the XID goes away. The object goes away when the XID goes away AND the context is not current to any thread.

If `contextID` refers to a direct rendering context then no error is generated but `glXImportContextEXT` returns NULL.

`glXImportContextEXT` is part of the `EXT_import_context` extension, 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 `GLX_EXTENSIONS`, extension `EXT_import_context` is supported.

## Errors

`GLXBadContext` is generated if `contextID` does not refer to a valid context.

## See Also

glXCreateContext, glXQueryVersion, glXQueryExtensionsString, glXGetContextIDEXT, glXFreeContextEXT

## 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/.