<s>
PTK	O
is	O
a	O
2D	O
rendering	O
engine	O
and	O
SDK	B-Application
developed	O
by	O
Phelios	O
,	O
Inc.	O
,	O
that	O
allows	O
computer	O
programmers	O
create	O
downloadable	O
games	O
in	O
C++	B-Language
that	O
are	O
portable	O
to	O
Microsoft	B-Application
Windows	I-Application
and	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
.	O
</s>
<s>
It	O
is	O
currently	O
used	O
by	O
about	O
60	O
downloadable	O
games	O
It	O
is	O
mainly	O
known	O
for	O
powering	O
breakaway	O
casual	O
hits	O
from	O
funpause	O
and	O
Big	O
Fish	O
Games	O
,	O
such	O
as	O
Azada	B-Application
,	O
Atlantis	O
,	O
Atlantis	B-Operating_System
Sky	I-Operating_System
Patrol	I-Operating_System
,	O
Mystic	O
Inn	O
and	O
Fairies	O
.	O
</s>
<s>
PTK	O
was	O
designed	O
for	O
programmers	O
to	O
enjoy	O
basic-like	O
ease	O
of	O
programming	O
using	O
the	O
C++	B-Language
.	O
</s>
<s>
It	O
abstracts	O
rendering	O
,	O
input	O
and	O
I/O	O
and	O
removes	O
the	O
need	O
for	O
directly	O
setting	O
up	O
complex	O
renderers	O
such	O
as	O
DirectX	B-Application
or	O
OpenGL	B-Application
.	O
</s>
<s>
While	O
it	O
is	O
a	O
2D	O
engine	O
,	O
it	O
uses	O
3D	O
acceleration	O
for	O
rendering	O
,	O
enabling	O
very	O
good	O
,	O
bicubic	B-Algorithm
filtered	O
rendering	O
of	O
scaled	O
,	O
rotated	O
sprites	O
and	O
per-pixel	O
alpha	B-Algorithm
blending	I-Algorithm
at	O
no	O
expense	O
of	O
computing	O
time	O
.	O
</s>
