glEnd man page on DigitalUNIX

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glBegin(3G)							   glBegin(3G)

NAME
       glBegin, glEnd - delimit the vertices of a primitive or a group of like
       primglBeginitives

SYNOPSIS
       void glBegin(
	       GLenum mode ); void glEnd(
	       void );

PARAMETERS
       Specifies the primitive or primitives that will be  created  from  ver‐
       tices  presented between glBegin() and the subsequent glEnd(). Ten sym‐
       bolic  constants	 are  accepted:	 GL_POINTS,  GL_LINES,	GL_LINE_STRIP,
       GL_LINE_LOOP,	GL_TRIANGLES,	 GL_TRIANGLE_STRIP,   GL_TRIANGLE_FAN,
       GL_QUADS, GL_QUAD_STRIP, and GL_POLYGON.

DESCRIPTION
       glBegin() and glEnd() delimit the vertices that define a primitive or a
       group  of  like	primitives.   glBegin() 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 ver‐
       tices specified, the interpretations are as follows: Treats each vertex
       as  a  single  point.  Vertex  n	 defines point n.  N points are drawn.
       Treats each pair of vertices as an independent line  segment.  Vertices
       2n-1  and  2n  define  line n.  N/2 lines are drawn.  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.  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.	 Treats	 each  triplet
       of  vertices  as	 an  independent triangle. Vertices 3n-2, 3n-1, and 3n
       define triangle n.  N/3 triangles are drawn.  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.	 Draws a connected  group  of  triangles.  One
       triangle	 is defined for each vertex presented after the first two ver‐
       tices. Vertices 1, n+1, and n+2 define triangle n.  N-2	triangles  are
       drawn.  Treats each group of four vertices as an independent quadrilat‐
       eral. Vertices 4n-3, 4n-2, 4n-1, and 4n define  quadrilateral  n.   N/4
       quadrilaterals  are  drawn.  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  ver‐
       tices  are used to construct a quadrilateral from strip data is differ‐
       ent from that used with independent data.  Draws a single, convex poly‐
       gon. Vertices 1 through N define this polygon.

       Only a subset of GL commands can be used between glBegin() and glEnd().
       The commands are glVertex(), glColor(), glIndex(), glNormal(), glTexCo‐
       ord(),  glEvalCoord(),  glEvalPoint(),  glArrayElement(), glMaterial(),
       and glEdgeFlag(). Also, it is acceptable to use glCallList() or glCall‐
       Lists()	to  execute display lists that include only the preceding com‐
       mands. If any other  GL	command	 is  executed  between	glBegin()  and
       glEnd(), the error option is set and the command is ignored.

       Regardless  of the value chosen for mode, there is no limit to the num‐
       ber of vertices that can be  defined  between  glBegin()	 and  glEnd().
       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.

       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 GL_LINES (2), GL_TRIANGLES (3),  GL_QUADS  (4),  and	 GL_QUAD_STRIP
       (2).

ERRORS
       GL_INVALID_ENUM is generated if mode is set to an unaccepted value.

       GL_INVALID_OPERATION  is	 generated  if glBegin() is executed between a
       glBegin() and the corresponding execution of glEnd().

       GL_INVALID_OPERATION is generated if glEnd() is executed without	 being
       preceded by a glBegin().

       GL_INVALID_OPERATION  is	 generated if a command other than glVertex(),
       glColor(), glIndex(), glNormal(), glTexCoord(), glEvalCoord(),  glEval‐
       Point(), glArrayElement(), glMaterial(), glEdgeFlag(), glCallList(), or
       glCallLists() is executed between the execution of  glBegin()  and  the
       corresponding execution glEnd().

       Execution of glEnableClientState(), glDisableClientState(), glEdgeFlag‐
       Pointer(),  glTexCoordPointer(),	 glColorPointer(),   glIndexPointer(),
       glNormalPointer(),  glVertexPointer(), glInterleavedArrays(), or glPix‐
       elStore() is not allowed after a call to glBegin() and before the  cor‐
       responding call to glEnd(), but an error may or may not be generated.

SEE ALSO
       glArrayElement(3),  glCallList(3),  glCallLists(),  glColor(3), glEdge‐
       Flag(3),	 glEvalCoord(3),  glEvalPoint(3),  glIndex(3),	glMaterial(3),
       glNormal(3), glTexCoord(3), glVertex(3)

								   glBegin(3G)
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