<s>
Clutter	B-Language
is	O
a	O
discontinued	O
GObject-based	O
graphics	B-Library
library	I-Library
for	O
creating	O
hardware-accelerated	O
user	O
interfaces	O
.	O
</s>
<s>
Clutter	B-Language
is	O
an	O
OpenGL-based	O
'	O
interactive	O
canvas	O
 '	O
library	O
and	O
does	O
not	O
contain	O
any	O
graphical	O
control	O
elements	O
.	O
</s>
<s>
It	O
relies	O
upon	O
OpenGL	B-Application
(	O
1.4	O
+	O
)	O
or	O
OpenGL	B-Application
ES	I-Application
(	O
1.1	O
or	O
2.0	O
)	O
for	O
rendering	O
,	O
.	O
</s>
<s>
It	O
also	O
supports	O
media	O
playback	O
using	O
GStreamer	B-Language
and	O
2D	O
graphics	O
rendering	O
using	O
Cairo	B-Language
.	O
</s>
<s>
Clutter	B-Language
was	O
authored	O
by	O
OpenedHand	B-Operating_System
Ltd	I-Operating_System
,	O
now	O
part	O
of	O
Intel	O
.	O
</s>
<s>
Clutter	B-Language
is	O
free	B-License
and	I-License
open-source	I-License
software	I-License
,	O
subject	O
to	O
the	O
requirements	O
of	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
,	O
version	O
2.1	O
.	O
</s>
<s>
No	O
more	O
versions	O
will	O
be	O
released	O
and	O
developers	O
using	O
Clutter	B-Language
are	O
encouraged	O
to	O
port	O
their	O
applications	O
to	O
GTK	B-Application
4	O
and	O
libadwaita2	O
.	O
</s>
<s>
Popular	O
programs	O
that	O
adopt	O
Clutter	B-Language
are	O
GNOME	B-Language
Videos	I-Language
(	O
a.k.a.	O
</s>
<s>
Totem	B-Language
)	O
,	O
GNOME	B-Language
Shell	I-Language
,	O
Pitivi	B-Application
,	O
Cinnamon	B-Language
Desktop	I-Language
and	O
GNOME	O
Ease	O
.	O
</s>
<s>
Mx	O
is	O
a	O
widget	O
toolkit	O
based	O
on	O
Clutter	B-Language
originally	O
designed	O
for	O
the	O
graphical	O
shell	O
of	O
Moblin/MeeGo	O
netbook	O
,	O
but	O
evolved	O
into	O
an	O
independent	O
project	O
.	O
</s>
<s>
The	O
widget	O
toolkits	O
Netbook	O
Toolkit	O
(	O
nbtk	O
)	O
and	O
Mx	O
are	O
based	O
on	O
Clutter	B-Language
.	O
</s>
<s>
Often	O
Clutter	B-Language
is	O
seen	O
analogous	O
to	O
GTK	B-Application
but	O
this	O
is	O
inaccurate	O
.	O
</s>
<s>
Only	O
Clutter	B-Language
together	O
with	O
Mx	O
or	O
Nbtk	O
can	O
match	O
the	O
extent	O
of	O
the	O
GTK	B-Application
.	O
</s>
<s>
This	O
is	O
also	O
the	O
reason	O
why	O
Clutter	B-Language
is	O
required	O
to	O
be	O
used	O
along	O
with	O
GTK	B-Application
.	O
</s>
<s>
Clutter	B-Language
supports	O
multi-touch	O
gestures	O
.	O
</s>
<s>
Clayland	B-Language
is	O
a	O
Wayland	B-Language
compositor	O
utilizing	O
Clutter	B-Language
.	O
</s>
<s>
Snappy	O
is	O
a	O
lightweight	O
media	O
player	O
based	O
on	O
Clutter	B-Language
and	O
GStreamer	B-Language
.	O
</s>
<s>
Proof	O
of	O
concept	O
casual	O
video	O
games	O
PillPopper	O
(	O
a	O
Pac-Man	B-Application
clone	O
)	O
and	O
HappyWombats	O
(	O
an	O
Angry	B-Application
Birds	I-Application
clone	O
)	O
use	O
Clutter	B-Language
.	O
</s>
<s>
GTK	B-Language
Scene	I-Language
Graph	I-Language
Kit	I-Language
(	O
GSK	B-Language
)	O
was	O
initially	O
released	O
as	O
part	O
of	O
GTK+	O
3.90	O
in	O
March	O
2017	O
and	O
is	O
meant	O
for	O
GTK-based	O
applications	O
that	O
wish	O
to	O
replace	O
Clutter	B-Language
for	O
their	O
UI	O
.	O
</s>
<s>
Clutter	B-Language
is	O
a	O
scene	O
graph-based	O
canvas	O
working	O
in	O
retained	O
mode	O
.	O
</s>
<s>
Clutter	B-Language
abstracts	O
the	O
native	O
windowing	O
environment	O
behind	O
a	O
backend	O
,	O
which	O
is	O
also	O
responsible	O
for	O
creating	O
the	O
main	O
container	O
for	O
the	O
scene	B-Data_Structure
graph	I-Data_Structure
;	O
this	O
top	O
level	O
container	O
is	O
called	O
the	O
stage	O
.	O
</s>
<s>
Instead	O
of	O
operating	O
on	O
matrices	O
,	O
as	O
does	O
OpenGL	B-Application
,	O
the	O
Clutter	B-Language
developer	O
changes	O
properties	O
of	O
each	O
actor	O
.	O
</s>
<s>
Clutter	B-Language
will	O
then	O
notice	O
the	O
changes	O
,	O
and	O
render	O
the	O
scene	O
accordingly	O
.	O
</s>
<s>
Clutter	B-Language
is	O
currently	O
being	O
developed	O
by	O
OpenedHand	B-Operating_System
to	O
provide	O
visually	O
rich	O
graphical	O
user	O
interfaces	O
on	O
desktop	O
and	O
embedded	O
hardware	O
.	O
</s>
<s>
Clutter	B-Language
uses	O
Pango	B-Language
for	O
text	O
rendering	O
(	O
with	O
a	O
special	O
GL/GLES	O
renderer	O
)	O
and	O
GdkPixbuf	O
for	O
loading	O
images	O
into	O
GL	O
textures	O
.	O
</s>
<s>
:	O
clutter-gst	O
(	O
GStreamer	B-Language
)	O
,	O
clutter-gtk	O
(	O
for	O
embedding	O
the	O
stage	O
into	O
a	O
GTK	B-Application
application	O
)	O
,	O
clutter-cairo	O
(	O
for	O
using	O
cairo	B-Language
to	O
draw	O
into	O
a	O
texture	O
)	O
.	O
</s>
<s>
ClutterActor	O
is	O
the	O
basic	O
element	O
of	O
Clutter	B-Language
's	O
scene	B-Data_Structure
graph	I-Data_Structure
,	O
it	O
encapsulates	O
the	O
position	O
,	O
size	O
,	O
and	O
transformations	O
of	O
a	O
node	O
in	O
the	O
graph	O
.	O
</s>
<s>
Animation	O
is	O
a	O
core	O
concept	O
of	O
modern	O
user	O
interfaces	O
;	O
Clutter	B-Language
provides	O
a	O
complete	O
and	O
powerful	O
animation	O
framework	O
that	O
automatically	O
tweens	O
the	O
actor	O
's	O
state	O
without	O
requiring	O
direct	O
,	O
frame	O
by	O
frame	O
manipulation	O
from	O
your	O
application	O
code	O
.	O
</s>
<s>
Clutter	B-Language
is	O
developed	O
for	O
the	O
X	B-Operating_System
Window	I-Operating_System
System	I-Operating_System
using	O
GLX	B-Device
as	O
well	O
as	O
Wayland	B-Language
using	O
EGL	B-Application
.	O
</s>
<s>
Clutter	B-Language
can	O
also	O
use	O
the	O
framebuffer	B-Algorithm
.	O
</s>
<s>
As	O
of	O
release	O
0.6	O
,	O
native	O
support	O
for	O
Mac	B-Operating_System
OS	I-Operating_System
X	I-Operating_System
has	O
been	O
added	O
.	O
</s>
<s>
A	O
native	O
Microsoft	B-Application
Windows	I-Application
backend	O
is	O
supported	O
since	O
the	O
0.8	O
release	O
and	O
Windows	O
pre-compiled	O
DLLs	O
are	O
available	O
,	O
however	O
,	O
it	O
is	O
possible	O
to	O
build	O
the	O
latest	O
DLL	O
for	O
Windows	O
with	O
MinGW	B-Application
and	O
Bash	O
shell	O
for	O
Windows	O
.	O
</s>
<s>
Since	O
version	O
1.19.4	O
from	O
June	O
2014	O
,	O
Clutter	B-Language
's	O
evdev	B-Application
input	I-Application
backend	I-Application
depends	O
on	O
libinput	B-Language
0.4.0	O
.	O
</s>
<s>
Clutter	B-Language
is	O
implemented	O
using	O
the	O
C	B-Language
programming	I-Language
language	I-Language
with	O
a	O
design	O
based	O
on	O
the	O
GObject	B-Language
object	B-Language
system	I-Language
.	O
</s>
<s>
C#	B-Application
(	O
Clutter-sharp	O
(	O
aka	O
Clutter#	O
)	O
)	O
?	O
</s>
<s>
Ruby	B-Language
(	O
)	O
?	O
</s>
<s>
Clutter	B-Language
can	O
be	O
integrated	O
with	O
other	O
libraries	O
and	O
toolkits	O
,	O
for	O
instance	O
:	O
</s>
<s>
GTK	B-Application
applications	O
can	O
embed	O
Clutter	B-Language
stages	O
using	O
a	O
special	O
widget	O
.	O
</s>
<s>
Clutter	B-Language
applications	O
can	O
embed	O
GTK	B-Application
widgets	O
using	O
the	O
'	O
client-side	O
windows	O
 '	O
feature	O
since	O
GTK+	O
2.18	O
.	O
</s>
<s>
Clutter	B-Language
applications	O
can	O
use	O
GStreamer	B-Language
to	O
play	O
videos	O
directly	O
into	O
a	O
Clutter	B-Language
texture	O
actor	O
.	O
</s>
<s>
Clutter	B-Language
applications	O
can	O
use	O
Cairo	B-Language
to	O
draw	O
onto	O
a	O
texture	O
.	O
</s>
<s>
This	O
example	O
will	O
add	O
a	O
label	O
on	O
the	O
stage	O
(	O
written	O
in	O
C	B-Language
)	O
.	O
</s>
<s>
Clutter	B-Language
can	O
build	O
user	O
interfaces	O
using	O
a	O
specialized	O
JSON	B-General_Concept
dialect	O
.	O
</s>
<s>
The	O
entire	O
scene	B-Data_Structure
graph	I-Data_Structure
is	O
defined	O
using	O
JSON	B-General_Concept
types	O
and	O
built	O
at	O
run	O
time	O
through	O
the	O
ClutterScript	O
class	O
.	O
</s>
<s>
Clutter	B-Language
allows	O
implicit	O
animations	O
of	O
every	O
item	O
on	O
the	O
canvas	O
using	O
special	O
objects	O
called	O
behaviours	O
:	O
each	O
behaviour	O
can	O
be	O
applied	O
to	O
multiple	O
actors	O
,	O
and	O
multiple	O
behaviours	O
can	O
be	O
composed	O
on	O
the	O
same	O
actor	O
.	O
</s>
<s>
Clutter	B-Language
provides	O
a	O
generic	O
base	O
class	O
for	O
developers	O
to	O
implement	O
custom	O
behaviours	O
,	O
and	O
various	O
simple	O
classes	O
handling	O
simple	O
properties	O
,	O
like	O
opacity	O
,	O
position	O
on	O
the	O
Z	O
axis	O
(	O
depth	O
)	O
,	O
position	O
along	O
a	O
path	O
,	O
rotation	O
,	O
etc	O
.	O
</s>
<s>
Since	O
Clutter	B-Language
1.0	O
,	O
it	O
is	O
also	O
possible	O
to	O
create	O
simple	O
,	O
one-off	O
animations	O
using	O
the	O
ClutterAnimation	O
class	O
and	O
the	O
clutter_actor_animate( )	O
convenience	O
function	O
.	O
</s>
<s>
This	O
statement	O
will	O
create	O
an	O
implicit	O
ClutterAnimation	O
object	O
,	O
which	O
will	O
animate	O
the	O
provided	O
GObject	B-Language
properties	O
between	O
their	O
current	O
value	O
and	O
the	O
specified	O
final	O
value	O
.	O
</s>
<s>
The	O
API	O
departs	O
from	O
the	O
flat	O
state	O
machine	O
style	O
of	O
OpenGL	B-Application
and	O
is	O
designed	O
to	O
make	O
it	O
easy	O
to	O
write	O
orthogonal	O
components	O
that	O
can	O
render	O
without	O
stepping	O
on	O
each	O
other	O
's	O
toes	O
.	O
</s>
<s>
Cogl	O
currently	O
supports	O
OpenGL	B-Application
ES	I-Application
1.1/2.0	O
and	O
OpenGL	B-Application
>	O
1.3	O
(	O
or	O
1.2	O
if	O
you	O
have	O
the	O
GL_ARB_multitexture	O
extension	O
)	O
,	O
and	O
having	O
Gallium3D	O
or	O
D3D	O
back-ends	O
are	O
options	O
for	O
the	O
future	O
.	O
</s>
<s>
libchamplain	O
is	O
a	O
C	B-Language
library	O
providing	O
a	O
ClutterActor	O
to	O
display	O
maps	O
.	O
</s>
<s>
It	O
also	O
provides	O
a	O
GTK	B-Application
widget	O
to	O
display	O
maps	O
in	O
GTK	B-Application
applications	O
.	O
</s>
