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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_
-_header(Begin,delimit the vertices of a primitive or a group of like primitives)
-_names(Begin)
-.EQ
-delim $$
-.EN
-.SH PARAMETERS
-_phead(_param1)
-Specifies the primitive or primitives that will be created from vertices
-presented between _cmnd(Begin) and the subsequent _cmnd(End).
-Ten symbolic constants are accepted:
-_const(POINTS),
-_const(LINES),
-_const(LINE_STRIP),
-_const(LINE_LOOP),
-_const(TRIANGLES),
-_const(TRIANGLE_STRIP),
-_const(TRIANGLE_FAN),
-_const(QUADS),
-_const(QUAD_STRIP), and
-_const(POLYGON).
-_names(End)
-.SH DESCRIPTION
-_cmnd(Begin) and _cmnd(End) delimit the vertices that define a primitive or
-a group of like primitives.
-_cmnd(Begin) accepts a single argument that specifies in which of ten ways the
-vertices are interpreted.
-Taking $n$ as an integer count starting at one,
-and $N$ as the total number of vertices specified,
-the interpretations are as follows:
-.TP 23
-_const(POINTS)
-Treats each vertex as a single point.
-Vertex $n$ defines point $n$.
-$N$ points are drawn.
-.TP
-_const(LINES)
-Treats each pair of vertices as an independent line segment.
-Vertices $2n^-^1$ and $2n$ define line $n$.
-$N/2$ lines are drawn.
-.TP
-_const(LINE_STRIP)
-Draws a connected group of line segments from the first vertex
-to the last.
-Vertices $n$ and $n~+~1$ define line $n$.
-$N^-^1$ lines are drawn.
-.TP
-_const(LINE_LOOP)
-Draws a connected group of line segments from the first vertex
-to the last,
-then back to the first.
-Vertices $n$ and $n~+~1$ define line $n$.
-The last line, however, is defined by vertices $N$ and $1$.
-$N$ lines are drawn.
-.TP
-_const(TRIANGLES)
-Treats each triplet of vertices as an independent triangle.
-Vertices $3n^-^2$, $3n^-^1$, and $3n$ define triangle $n$.
-$N/3$ triangles are drawn.
-.BP
-.TP
-_const(TRIANGLE_STRIP)
-Draws a connected group of triangles.  One triangle is defined for each
-vertex presented after the first two vertices.  For odd $n$, vertices
-$n$, $n~+~1$, and $n~+~2$ define triangle $n$.  For even $n$, vertices
-$n~+~1$, $n$, and $n~+~2$ define triangle $n$.  $N^-^2$ triangles are
-drawn.
-.TP
-_const(TRIANGLE_FAN)
-Draws a connected group of triangles.
-One triangle is defined for each vertex presented after the first two vertices.
-Vertices $1$,
-$n~+~1$,
-and $n~+~2$ define triangle $n$.
-$N^-^2$ triangles are drawn.
-.TP
-_const(QUADS)
-Treats each group of four vertices as an independent quadrilateral.
-Vertices $4n^-^3$, $4n^-^2$, $4n^-^1$, and $4n$
-define quadrilateral $n$.
-$N/4$ quadrilaterals are drawn.
-.TP
-_const(QUAD_STRIP)
-Draws a connected group of quadrilaterals.
-One quadrilateral is defined for each pair of vertices presented
-after the first pair.
-Vertices $2n^-^1$, $2n$, $2n~+~2$, and $2n~+~1$ define quadrilateral $n$.
-$N/2^-^1$ quadrilaterals are drawn.
-Note that the order in which vertices are used to construct a quadrilateral
-from strip data is different from that used with independent data.
-.TP
-_const(POLYGON)
-Draws a single,
-convex polygon.
-Vertices $1$ through $N$ define this polygon.
-.P
-Only a subset of GL commands can be used between _cmnd(Begin) and _cmnd(End).
-The commands are
-_cmnd(Vertex),
-_cmnd(Color),
-_cmnd(Index),
-_cmnd(Normal),
-_cmnd(TexCoord),
-_cmnd(EvalCoord),
-_cmnd(EvalPoint),
-_cmnd(ArrayElement),
-_cmnd(Material), and
-_cmnd(EdgeFlag).
-Also,
-it is acceptable to use
-_cmnd(CallList) or
-_cmnd(CallLists) to execute
-display lists that include only the preceding commands.
-If any other GL command is executed between _cmnd(Begin) and _cmnd(End),
-the error flag is set and the command is ignored.
-.P
-Regardless of the value chosen for _param1(1),
-there is no limit to the number of vertices that can be defined
-between _cmnd(Begin) and _cmnd(End).
-Lines,
-triangles,
-quadrilaterals,
-and polygons that are incompletely specified are not drawn.
-Incomplete specification results when either too few vertices are
-provided to specify even a single primitive or when an incorrect multiple 
-of vertices is specified. The incomplete primitive is ignored; the rest are drawn.
-.P
-The minimum specification of vertices
-for each primitive is as follows:
-1 for a point,
-2 for a line,
-3 for a triangle,
-4 for a quadrilateral,
-and 3 for a polygon.
-Modes that require a certain multiple of vertices are
-_const(LINES) (2),
-_const(TRIANGLES) (3),
-_const(QUADS) (4),
-and _const(QUAD_STRIP) (2).
-.SH ERRORS
-_const(INVALID_ENUM) is generated if _param1(1) is set to an unaccepted value.
-.P
-_const(INVALID_OPERATION) is generated if _cmnd(Begin) is executed between a 
-_cmnd(Begin)
-and the corresponding execution of _cmnd(End).
-.P
-_const(INVALID_OPERATION) is generated if _cmnd(End) is executed without being
-preceded by a _cmnd(Begin).
-.P
-_const(INVALID_OPERATION) is generated if a command other than
-_cmnd(Vertex),
-_cmnd(Color),
-_cmnd(Index),
-_cmnd(Normal),
-_cmnd(TexCoord),
-_cmnd(EvalCoord),
-_cmnd(EvalPoint),
-_cmnd(ArrayElement),
-_cmnd(Material),
-_cmnd(EdgeFlag),
-_cmnd(CallList), or
-_cmnd(CallLists) is executed between
-the execution of _cmnd(Begin) and the corresponding
-execution _cmnd(End).
-.P
-Execution of 
-_cmnd(EnableClientState),
-_cmnd(DisableClientState),
-_cmnd(EdgeFlagPointer),
-_cmnd(TexCoordPointer),
-_cmnd(ColorPointer),
-_cmnd(IndexPointer),
-_cmnd(NormalPointer),
-.br
-_cmnd(VertexPointer),
-_cmnd(InterleavedArrays), or
-_cmnd(PixelStore) is not allowed after a call to _cmnd(Begin) and before
-the corresponding call to _cmnd(End),
-but an error may or may not be generated.
-.SH SEE ALSO
-_cmnd(ArrayElement),
-_cmnd(CallList),
-_cmnd(CallLists),
-_cmnd(Color),
-_cmnd(EdgeFlag),
-_cmnd(EvalCoord),
-.br
-_cmnd(EvalPoint),
-_cmnd(Index),
-_cmnd(Material),
-_cmnd(Normal),
-_cmnd(TexCoord),
-_cmnd(Vertex)
-
-