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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)