OpenGL man pages
glArrayElementEXT - specify the array elements used to render a vertex
void glArrayElementEXT( GLint i )
i Specifies an index in the enabled arrays.
glArrayElementEXT commands are used within glBegin/glEnd pairs to specify
vertex and attribute data for point, line and polygon primitives. When
glArrayElementEXT is called, a single vertex is drawn, using vertex and
attribute data taken from location i of the enabled arrays.
Use glArrayElementEXT 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 per
glArrayElementEXT may be included in display lists. If glArrayElementEXT 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.
Static array data may be read and cached by the implementation at any time.
If static array elements are modified and the arrays are not respecified,
the results of any subsequent calls to glArrayElementEXT are undefined.
glArrayElementEXT executes even if GL_VERTEX_ARRAY_EXT is not enabled. No
drawing occurs in this case, but the attributes corresponding to enabled
arrays are modified.
Although it is not an error to respecify an array between the execution of
glBegin and the corresponding execution of glEnd, the result of such
respecification is undefined.
glArrayElementEXT is part of the EXT_vertex_array extension, not
part of the core GL command set. If "GL_EXT_vertex_array" is
included in the string returned by glGetString, when called with argument
GL_EXTENSIONS, extension EXT_vertex_array is supported.
glColorPointerEXT, glDrawArraysEXT, glEdgeFlagPointerEXT, glGetPointervEXT,
glIndexPointerEXT, glNormalPointerEXT, glTexCoordPointerEXT,
Fri Dec 6 11:18:03 EST 1996
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