<s>
Rendering	B-Application
APIs	I-Application
typically	O
provide	O
just	O
enough	O
functionality	O
to	O
abstract	O
a	O
graphics	B-Architecture
accelerator	I-Architecture
,	O
focussing	O
on	O
rendering	O
primitives	O
,	O
state	O
management	O
,	O
command	O
lists/command	O
buffers	O
;	O
and	O
as	O
such	O
differ	O
from	O
fully	O
fledged	O
3D	B-Library
graphics	I-Library
libraries	I-Library
,	O
3D	O
engines	O
(	O
which	O
handle	O
scene	B-Data_Structure
graphs	I-Data_Structure
,	O
lights	O
,	O
animation	O
,	O
materials	O
etc	O
.	O
</s>
<s>
)	O
,	O
and	O
GUI	O
frameworks	O
;	O
Some	O
provide	O
fallback	O
software	O
rasterisers	O
,	O
which	O
were	O
important	O
for	O
compatibility	O
and	O
adoption	O
before	O
graphics	B-Architecture
accelerators	I-Architecture
became	O
widespread	O
.	O
</s>
<s>
Some	O
have	O
been	O
extended	O
to	O
include	O
support	O
for	O
compute	B-Operating_System
shaders	I-Operating_System
.	O
</s>
<s>
Low	O
level	O
rendering	B-Application
APIs	I-Application
typically	O
leave	O
more	O
responsibility	O
with	O
the	O
user	O
for	O
resource	O
memory	B-General_Concept
management	I-General_Concept
,	O
and	O
require	O
more	O
verbose	O
control	O
,	O
but	O
have	O
significantly	O
lower	O
CPU	B-Device
overhead	O
,	O
and	O
allow	O
greater	O
utilisation	O
of	O
multicore	B-Architecture
processors	I-Architecture
.	O
</s>
<s>
RenderMan	B-Application
aimed	O
at	O
offline	O
rendering	O
for	O
CG	O
films	O
.	O
</s>
<s>
These	O
libraries	O
are	O
designed	O
explicitly	O
to	O
abstract	O
3D	O
graphics	O
hardware	O
for	O
CAD	B-Application
and	O
video	O
games	O
,	O
with	O
possible	O
software	O
fallbacks	O
.	O
</s>
<s>
OpenGL	B-Library
SC	I-Library
a	O
version	O
of	O
openGL	B-Application
for	O
safety	O
critical	O
systems	O
.	O
</s>
<s>
RenderWare	O
(	O
combined	O
game	O
engine	O
and	O
cross	O
platform	O
rendering	O
API	B-General_Concept
.	O
</s>
<s>
Became	O
popular	O
since	O
the	O
PlayStation	B-Device
2	I-Device
had	O
no	O
rendering	O
API	B-General_Concept
,	O
initially	O
relying	O
on	O
bare	O
metal	B-Library
programming	O
.	O
)	O
</s>
<s>
Metal	B-Library
developed	O
by	O
Apple	O
.	O
</s>
<s>
Mantle	B-Application
developed	O
by	O
AMD	O
.	O
</s>
