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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(PolygonMode,select a polygon rasterization mode)
+_names(PolygonMode)
+.SH PARAMETERS
+_phead(_param1)
+Specifies the polygons that _param2 applies to.
+Must be
+_const(FRONT) for front-facing polygons,
+_const(BACK) for back-facing polygons,
+or _const(FRONT_AND_BACK) for front- and back-facing polygons.
+_phead(_param2)
+Specifies how polygons will be rasterized.
+Accepted values are
+_const(POINT),
+_const(LINE), and
+_const(FILL).
+The initial value is _const(FILL) for both front- and back-facing polygons.
+.SH DESCRIPTION
+_cmnd controls the interpretation of polygons for rasterization.
+_param1 describes which polygons _param2 applies to:
+front-facing polygons (_const(FRONT)),
+back-facing polygons (_const(BACK)),
+or both (_const(FRONT_AND_BACK)).
+The polygon mode affects only the final rasterization of polygons.
+In particular,
+a polygon's vertices are lit and
+the polygon is clipped and possibly culled before these modes are applied.
+.P
+Three modes are defined and can be specified in _param2:
+.TP 14
+_const(POINT)
+Polygon vertices that are marked as the start of a boundary edge
+are drawn as points.
+Point attributes such as
+_const(POINT_SIZE) and
+_const(POINT_SMOOTH) control
+the rasterization of the points.
+Polygon rasterization attributes other than _const(POLYGON_MODE) have no effect.
+.TP
+_const(LINE)
+Boundary edges of the polygon are drawn as line segments.
+They are treated as connected line segments for line stippling;
+the line stipple counter and pattern are not reset between segments
+(see _cmnd(LineStipple)).
+Line attributes such as
+_const(LINE_WIDTH) and
+_const(LINE_SMOOTH) control
+the rasterization of the lines.
+Polygon rasterization attributes other than _const(POLYGON_MODE) have no effect.
+.TP
+_const(FILL)
+The interior of the polygon is filled.
+Polygon attributes such as
+_const(POLYGON_STIPPLE) and
+_const(POLYGON_SMOOTH) control the rasterization of the polygon.
+.SH EXAMPLES
+To draw a surface with filled back-facing polygons
+and outlined front-facing polygons,
+call
+.Ex 1
+glPolygonMode(_const(FRONT), _const(LINE));
+.Ee
+.SH NOTES
+Vertices are marked as boundary or nonboundary with an edge flag.
+Edge flags are generated internally by the GL when it decomposes
+polygons; they can be set explicitly using _cmnd(EdgeFlag).
+.SH ERRORS
+_const(INVALID_ENUM) is generated if either _param1 or _param2 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(POLYGON_MODE)
+.SH SEE ALSO
+_cmnd(Begin),
+_cmnd(EdgeFlag),
+_cmnd(LineStipple),
+_cmnd(LineWidth),
+_cmnd(PointSize),
+_cmnd(PolygonStipple)