_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
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_C_ 
_C_ http://oss.sgi.com/projects/FreeB
_C_ 
_C_ Note that, as provided in the License, the Software is distributed on an
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_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_ The first character in this file must be an '_'!
_C_ Anything on a line after _C_ is ignored
_define(_filters,eqn|tbl)_C_
_C_      eqn is automatically replaced with neqn for nroff
_header(ActiveTextureARB, select active texture unit)
_names(ActiveTextureARB)
.EQ
delim $$
.EN
.SH PARAMETERS
_phead(_param1)
Specifies which texture unit to make active. The number
of texture units is implementation dependent, but must be at least
two. _param1 must be one of _arbconstidx(TEXTURE), where 
0 \(<= $ i $ < _arbconst(MAX_TEXTURE_UNITS), which is an
implementation-dependent value.  The intial value is _arbconst(TEXTURE0).
.SH DESCRIPTION
_cmnd selects which texture unit subsequent texture state calls will
affect.  The number of texture units an implementation supports is
implementation dependent, but must be at least 2.
.P
Vertex arrays are client-side GL resources, which are selected by the 
_cmnd(ClientActiveTextureARB) routine.
.SH NOTES
_cmnd is only supported if _arbstring(multitexture) is included in the
string returned by _cmnd(GetString) when called with the argument
_const(EXTENSIONS).
.SH ERRORS 
_const(INVALID_ENUM) is generated if _param1 is not one of
_arbconstidx(TEXTURE),
.br
where 0 \(<= $ i $ < _arbconst(MAX_TEXTURE_UNITS).
.SH SEE ALSO
_cmnd(ClientActiveTextureARB),
_cmnd(GetIntegerv),
_cmnd(MultiTexCoordARB),
_cmnd(TexParameter)