_C_ License Applicability. Except to the extent portions of this file are
_C_ made subject to an alternative license as permitted in the SGI Free
_C_ Software License B, Version 1.1 (the "License"), the contents of this
_C_ file are subject only to the provisions of the License. You may not use
_C_ this file except in compliance with the License. You may obtain a copy
_C_ of the License at Silicon Graphics, Inc., attn: Legal Services, 1600
_C_ Amphitheatre Parkway, Mountain View, CA 94043-1351, or at:
_C_ 
_C_ http://oss.sgi.com/projects/FreeB
_C_ 
_C_ Note that, as provided in the License, the Software is distributed on an
_C_ "AS IS" basis, with ALL EXPRESS AND IMPLIED WARRANTIES AND CONDITIONS
_C_ DISCLAIMED, INCLUDING, WITHOUT LIMITATION, ANY IMPLIED WARRANTIES AND
_C_ CONDITIONS OF MERCHANTABILITY, SATISFACTORY QUALITY, FITNESS FOR A
_C_ PARTICULAR PURPOSE, AND NON-INFRINGEMENT.
_C_ 
_C_ Original Code. The Original Code is: OpenGL Sample Implementation,
_C_ Version 1.2.1, released January 26, 2000, developed by Silicon Graphics,
_C_ Inc. The Original Code is Copyright (c) 1991-2000 Silicon Graphics, Inc.
_C_ Copyright in any portions created by third parties is as indicated
_C_ elsewhere herein. All Rights Reserved.
_C_ 
_C_ Additional Notice Provisions: The application programming interfaces
_C_ established by SGI in conjunction with the Original Code are The
_C_ OpenGL(R) Graphics System: A Specification (Version 1.2.1), released
_C_ April 1, 1999; The OpenGL(R) Graphics System Utility Library (Version
_C_ 1.3), released November 4, 1998; and OpenGL(R) Graphics with the X
_C_ Window System(R) (Version 1.3), released October 19, 1998. This software
_C_ was created using the OpenGL(R) version 1.2.1 Sample Implementation
_C_ published by SGI, but has not been independently verified as being
_C_ compliant with the OpenGL(R) version 1.2.1 Specification.
_C_
_C_ $Date: 2004/03/14 08:29:09 $ $Revision: 1.1.1.4 $
_C_ The first character in this file must be an '_'!
_C_ Anything on a line after _C_ is ignored
_define(_filters,eqn)_C_
_C_      eqn is automatically replaced with neqn for nroff
_header(CheckExtension, determines if an extension name is supported) 
_names(CheckExtension)
.SH PARAMETERS
_phead(_param1)
Specifies an extension name.
_phead(_param2)
Specifies a space-separated list of extension names supported. 
.SH DESCRIPTION
_cmnd returns _const(TRUE) if _param1 is supported otherwise 
_const(FALSE) is returned.
.P
This is used to check for the presence for OpenGL, GLU or GLX extension names
by passing the extension strings returned by _glcmnd(GetString), 
_cmnd(GetString), _glcmnd(XGetClientString),
_glcmnd(XQueryExtensionsString), or _glcmnd(XQueryServerString),
respectively, as _param2.
.SH NOTES
Cases where one extension name is a substring of another are
correctly handled.
.P
There may or may not be leading or trailing blanks in _param2.
.P
Extension names should not contain embedded spaces.
.P
All strings are null-terminated.
.SH SEE ALSO
_glcmnd(GetString),
_cmnd(GetString),
_glcmnd(XGetClientString),
_glcmnd(XQueryExtensionsString),
_glcmnd(XQueryServerString)