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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_
-_header(Rect,draw a rectangle)
-_names(Rect,[dfis])
-.SH PARAMETERS
-_phead(_param1 _param2)
-Specify one vertex of a rectangle.
-_phead(_param3 _param4)
-Specify the opposite vertex of the rectangle.
-_names(Rect,[dfis]v)
-.BP
-.SH PARAMETERS
-_phead(_param1)
-Specifies a pointer to one vertex of a rectangle.
-_phead(_param2)
-Specifies a pointer to the opposite vertex of the rectangle.
-.SH DESCRIPTION
-_cmnd supports efficient specification of rectangles as two corner points.
-Each
-rectangle command takes four arguments,
-organized either as two consecutive pairs of (\f2x\fP,\f2y\fP) coordinates,
-or as two pointers to arrays,
-each containing an (\f2x\fP,\f2y\fP) pair.
-The resulting rectangle is defined in the \f2z\fP = 0 plane.
-.P
-_cmnd(Rect)(_param1(1), _param2(1), _param3(1), _param4(1))
-is exactly equivalent to the following sequence:
-.Ex 6
-glBegin(_const(POLYGON));
-glVertex2(_param1(1), _param2(1));
-glVertex2(_param3(1), _param2(1));
-glVertex2(_param3(1), _param4(1));
-glVertex2(_param1(1), _param4(1));
-glEnd();
-.Ee
-Note that if the second vertex is above and to the right of the first vertex,
-the rectangle is constructed with a counterclockwise winding.
-.SH ERRORS
-_const(INVALID_OPERATION) is generated if _cmnd
-is executed between the execution of _cmnd(Begin)
-and the corresponding execution of _cmnd(End).
-.SH SEE ALSO
-_cmnd(Begin),
-_cmnd(Vertex)