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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(DepthRange,specify mapping of depth values from normalized device coordinates to window coordinates)
-_names(DepthRange)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies the mapping of the near clipping plane to window coordinates.
-The initial value is 0.
-_phead(_param2)
-Specifies the mapping of the far clipping plane to window coordinates.
-The initial value is 1.
-.SH DESCRIPTION
-After clipping and division by \f2w\fP,
-depth coordinates range from \-1 to 1,
-corresponding to the near and far clipping planes.
-_cmnd specifies a linear mapping of the normalized depth coordinates
-in this range to window depth coordinates.
-Regardless of the actual depth buffer implementation,
-window coordinate depth values are treated as though they range
-from 0 through 1 (like color components).
-Thus,
-the values accepted by _cmnd are both clamped to this range
-before they are accepted.
-.P
-The setting of (0,1) maps the near plane to 0 and
-the far plane to 1.
-With this mapping,
-the depth buffer range is fully utilized.
-.SH NOTES
-It is not necessary that _param1 be less than _param2.
-Reverse mappings such as $_eqnparam1 ~=~ 1$, and $_eqnparam2 ~=~ 0$
-are acceptable.
-.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 ASSOCIATED GETS
-_cmnd(Get) with argument _const(DEPTH_RANGE)
-.SH SEE ALSO
-_cmnd(DepthFunc),
-_cmnd(PolygonOffset),
-_cmnd(Viewport)