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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
_C_ A real line follows.
_define(_filters,tbl|eqn)_C_
_C_ eqn is automatically replaced with neqn for nroff
_C_ Use GL not OpenGL
_C_ Don't change the ordering of the main headers.
_C_ C specification (or fortran) is handled automatically
_C_ .TH is automatically added to the top of this file.
_C_ Below, use current tense, active do not capitalize the first word and dont
_C_ use a period.
_header(DrawElements, render primitives from array data)
_names(DrawElements)
.EQ
delim $$
.EN
.SH PARAMETERS
_phead(_param1)
Specifies what kind of primitives to render.
Symbolic constants
_const(POINTS),
_const(LINE_STRIP),
_const(LINE_LOOP),
_const(LINES),
_const(TRIANGLE_STRIP),
_const(TRIANGLE_FAN),
_const(TRIANGLES),
_const(QUAD_STRIP),
_const(QUADS),
and _const(POLYGON) are accepted.
_phead(_param2)
Specifies the number of elements to be rendered.
_phead(_param3)
Specifies the type of the values in _param4. Must be one of
_const(UNSIGNED_BYTE), _const(UNSIGNED_SHORT), or
_const(UNSIGNED_INT).
_phead(_param4)
Specifies a pointer to the location where the indices are stored.
.SH DESCRIPTION
_cmnd specifies multiple geometric primitives
with very few subroutine calls. Instead of calling a GL function
to pass each individual vertex, normal, texture coordinate, edge
flag, or color, you can prespecify
separate arrays of vertices, normals, and so on and use them to
construct a sequence of primitives with a single
call to _cmnd.
.P
When _cmnd is called, it uses _param2 sequential elements from an
enabled array, starting at _param4 to construct a sequence of
geometric primitives. _param1 specifies what kind of primitives are
constructed, and how the array elements construct these primitives. If
more than one array is enabled, each is used. If
_const(VERTEX_ARRAY) is not enabled, no geometric primitives are
constructed.
.P
Vertex attributes that are modified by _cmnd have an
unspecified value after _cmnd returns. For example, if
_const(COLOR_ARRAY) is enabled, the value of the current color is
undefined after _cmnd executes. Attributes that aren't
modified maintain their previous values.
.SH NOTES
_cmnd is available only if the GL version is 1.1 or greater.
.P
_cmnd is included in display lists. If _cmnd 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.
.SH ERRORS
_const(INVALID_ENUM) is generated if _param1 is not an accepted value.
.P
_const(INVALID_VALUE) is generated if _param2 is negative.
.P
_const(INVALID_OPERATION) is generated if _cmnd is executed between
the execution of _cmnd(Begin) and the corresponding _cmnd(End).
.SH SEE ALSO
_cmnd(ArrayElement),
_cmnd(ColorPointer),
_cmnd(DrawArrays),
_cmnd(DrawRangeElements),
_cmnd(EdgeFlagPointer),
_cmnd(GetPointerv),
_cmnd(IndexPointer),
_cmnd(InterleavedArrays),
_cmnd(NormalPointer),
_cmnd(TexCoordPointer),
_cmnd(VertexPointer)
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