<s>
The	O
OpenGL	B-Library
Utility	I-Library
Library	I-Library
(	O
GLU	O
)	O
is	O
a	O
computer	O
graphics	B-Library
library	I-Library
for	O
OpenGL	B-Application
.	O
</s>
<s>
It	O
consists	O
of	O
a	O
number	O
of	O
functions	O
that	O
use	O
the	O
base	O
OpenGL	B-Application
library	O
to	O
provide	O
higher-level	O
drawing	O
routines	O
from	O
the	O
more	O
primitive	O
routines	O
that	O
OpenGL	B-Application
provides	O
.	O
</s>
<s>
It	O
is	O
usually	O
distributed	O
with	O
the	O
base	O
OpenGL	B-Application
package	O
.	O
</s>
<s>
GLU	O
is	O
not	O
implemented	O
in	O
the	O
embedded	O
version	O
of	O
the	O
OpenGL	B-Application
package	O
,	O
OpenGL	B-Application
ES	I-Application
.	O
</s>
<s>
Among	O
these	O
features	O
are	O
mapping	O
between	O
screen	O
-	O
and	O
world-coordinates	O
,	O
generation	O
of	O
texture	O
mipmaps	B-Data_Structure
,	O
drawing	O
of	O
quadric	O
surfaces	O
,	O
NURBS	B-Algorithm
,	O
tessellation	B-Algorithm
of	O
polygonal	O
primitives	O
,	O
interpretation	O
of	O
OpenGL	B-Application
error	O
codes	O
,	O
an	O
extended	O
range	O
of	O
transformation	O
routines	O
for	O
setting	O
up	O
viewing	O
volumes	O
and	O
simple	O
positioning	O
of	O
the	O
camera	O
,	O
generally	O
in	O
more	O
human-friendly	O
terms	O
than	O
the	O
routines	O
presented	O
by	O
OpenGL	B-Application
.	O
</s>
<s>
It	O
also	O
provides	O
additional	O
primitives	O
for	O
use	O
in	O
OpenGL	B-Application
applications	O
,	O
including	O
spheres	O
,	O
cylinders	O
and	O
disks	O
.	O
</s>
<s>
The	O
GLU	O
specification	O
was	O
last	O
updated	O
in	O
1998	O
,	O
and	O
it	O
depends	O
on	O
features	O
which	O
were	O
deprecated	B-General_Concept
with	O
the	O
release	O
of	O
OpenGL	B-Application
3.1	O
in	O
2009	O
.	O
</s>
