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GLARRAYELEMENT(3G)		 OpenGL Manual		    GLARRAYELEMENT(3G)

NAME
       glArrayElement - render a vertex using the specified vertex array
       element

C SPECIFICATION
       void glArrayElement(GLint i);

PARAMETERS
       i
	   Specifies an index into the enabled vertex data arrays.

DESCRIPTION
       glArrayElement commands are used within glBegin()/glEnd() pairs to
       specify vertex and attribute data for point, line, and polygon
       primitives. If GL_VERTEX_ARRAY is enabled when glArrayElement is
       called, a single vertex is drawn, using vertex and attribute data taken
       from location i of the enabled arrays. If GL_VERTEX_ARRAY is not
       enabled, no drawing occurs but the attributes corresponding to the
       enabled arrays are modified.

       Use glArrayElement to construct primitives by indexing vertex data,
       rather than by streaming through arrays of data in first-to-last order.
       Because each call specifies only a single vertex, it is possible to
       explicitly specify per-primitive attributes such as a single normal for
       each triangle.

       Changes made to array data between the execution of glBegin() and the
       corresponding execution of glEnd() may affect calls to glArrayElement
       that are made within the same glBegin()/glEnd() period in nonsequential
       ways. That is, a call to glArrayElement that precedes a change to array
       data may access the changed data, and a call that follows a change to
       array data may access original data.

NOTES
       glArrayElement is available only if the GL version is 1.1 or greater.

       glArrayElement is included in display lists. If glArrayElement is
       entered into a display list, the necessary array data (determined by
       the array pointers and enables) is also entered into the display list.
       Because the array pointers and enables are client-side state, their
       values affect display lists when the lists are created, not when the
       lists are executed.

ERRORS
       GL_INVALID_VALUE may be generated if i is negative.

       GL_INVALID_OPERATION is generated if a non-zero buffer object name is
       bound to an enabled array and the buffer object's data store is
       currently mapped.

SEE ALSO
       glClientActiveTexture(), glColorPointer(), glDrawArrays(),
       glEdgeFlagPointer(), glFogCoordPointer(), glGetPointerv(),
       glIndexPointer(), glInterleavedArrays(), glNormalPointer(),
       glSecondaryColorPointer(), glTexCoordPointer(), glVertexPointer()

COPYRIGHT
       Copyright © 1991-2006 Silicon Graphics, Inc. This document is licensed
       under the SGI Free Software B License. For details, see
       http://oss.sgi.com/projects/FreeB/.

AUTHORS
       opengl.org

opengl.org			  03/16/2013		    GLARRAYELEMENT(3G)

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