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+_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_ 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(Viewport,set the viewport)
+_names(Viewport)
+.EQ
+delim $$
+.EN
+.SH PARAMETERS
+_phead(_param1 _param2)
+Specify the lower left corner of the viewport rectangle,
+in pixels. The initial value is (0,0).
+_phead(_param3 _param4)
+Specify the width and height
+of the viewport.
+When a GL context is first attached to a window,
+_param3 and _param4 are set to the dimensions of that window.
+.SH DESCRIPTION
+_cmnd specifies the affine transformation of $x$ and $y$ from
+normalized device coordinates to window coordinates.
+Let ($x sub nd$, $y sub nd$) be normalized device coordinates.
+Then the window coordinates ($x sub w$, $y sub w$) are computed as follows:
+.sp
+.ce
+.EQ
+x sub w ~=~ ( x sub nd ~+~ 1 ) left ( _eqnparam3 over 2 right ) ~+~ _eqnparam1
+.EN
+.sp
+.ce
+.EQ
+y sub w ~=~ ( y sub nd ~+~ 1 ) left ( _eqnparam4 over 2 right ) ~+~ _eqnparam2
+.EN
+.RE
+.P
+Viewport width and height are silently clamped
+to a range that depends on the implementation.
+To query this range, call _cmnd(Get) with argument
+_const(MAX_VIEWPORT_DIMS).
+.SH ERRORS
+_const(INVALID_VALUE) is generated if either _param3 or _param4 is negative.
+.P
+_const(INVALID_OPERATION) is generated if _cmnd
+is executed between the execution of _cmnd(Begin)
+and the corresponding execution of _cmnd(End).
+.bp
+.SH ASSOCIATED GETS
+_cmnd(Get) with argument _const(VIEWPORT)
+.br
+_cmnd(Get) with argument _const(MAX_VIEWPORT_DIMS)
+.SH SEE ALSO
+_cmnd(DepthRange)