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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,tbl|eqn)_C_
-_C_      eqn is automatically replaced with neqn for nroff
-_header(DepthFunc,specify the value used for depth buffer comparisons)
-_names(DepthFunc)
-.SH PARAMETERS
-_phead(_param1)
-Specifies the depth comparison function.
-Symbolic constants
-_const(NEVER),
-_const(LESS),
-_const(EQUAL),
-_const(LEQUAL),
-_const(GREATER),
-_const(NOTEQUAL),
-_const(GEQUAL), and
-_const(ALWAYS) are accepted.
-The initial value is _const(LESS).
-.SH DESCRIPTION
-_cmnd specifies the function used to compare each incoming pixel depth value
-with the depth value present in the depth buffer.
-The comparison is performed only if depth testing is enabled.
-(See _cmnd(Enable) and _cmnd(Disable) of _const(DEPTH_TEST).)
-.P
-_param1 specifies the conditions under which the pixel will be drawn.
-The comparison functions are as follows:
-.TP 16
-_const(NEVER)
-Never passes. 
-.TP
-_const(LESS)
-Passes if the incoming depth value is less than the stored depth value.
-.TP
-_const(EQUAL)
-Passes if the incoming depth value is equal to the stored depth value.
-.TP
-_const(LEQUAL)
-Passes if the incoming depth value is less than or equal to
-the stored depth value.
-.TP
-_const(GREATER) 
-Passes if the incoming depth value is greater than the stored depth value.
-.TP
-_const(NOTEQUAL)
-Passes if the incoming depth value is not equal to the stored depth value.
-.TP
-_const(GEQUAL)
-Passes if the incoming depth value is greater than or equal to
-the stored depth value.
-.TP
-_const(ALWAYS)
-Always passes. 
-.P
-The initial value of _param1 is _const(LESS).
-Initially, depth testing is disabled.
-.NOTES
-Even if the depth buffer exists and the depth mask is non-zero, the
-depth buffer is not updated if the depth test is disabled. 
-.SH ERRORS
-_const(INVALID_ENUM) is generated if _param1 is not an accepted value.
-.P
-_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_FUNC)
-.br
-_cmnd(IsEnabled) with argument _const(DEPTH_TEST)
-.SH SEE ALSO
-_cmnd(DepthRange),
-_cmnd(Enable),
-_cmnd(PolygonOffset)