<s>
GTK	B-Language
Scene	I-Language
Graph	I-Language
Kit	I-Language
(	O
GSK	O
)	O
is	O
the	O
rendering	O
and	O
scene	O
graph	O
API	O
for	O
GTK	B-Application
introduced	O
with	O
version	O
3.90	O
.	O
</s>
<s>
Like	O
GDK	B-Language
,	O
GSK	O
is	O
part	O
of	O
GTK	B-Application
and	O
licensed	O
under	O
the	O
GNU	B-Application
Lesser	I-Application
General	I-Application
Public	I-Application
License	I-Application
(	O
LGPL	B-Application
)	O
.	O
</s>
<s>
GSK	O
is	O
part	O
of	O
GTK	B-Application
.	O
</s>
<s>
GSK	O
is	O
meant	O
to	O
be	O
used	O
by	O
GTK	B-Application
itself	O
and	O
by	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>
Applications	O
that	O
made	O
use	O
of	O
Clutter	B-Language
instead	O
of	O
using	O
only	O
GTK	B-Application
are	O
e.g.	O
</s>
<s>
GNOME	B-Language
Shell	I-Language
,	O
GNOME	B-Language
Videos	I-Language
,	O
GNOME	B-Language
Boxes	I-Language
and	O
Cheese	B-Language
.	O
</s>
<s>
Any	O
application	O
which	O
makes	O
use	O
of	O
GTK	B-Application
's	O
graphical	O
control	O
elements	O
(	O
widgets	O
)	O
,	O
as	O
opposed	O
to	O
those	O
applications	O
getting	O
a	O
GTK	B-Application
window	O
and	O
then	O
drawing	O
themselves	O
on	O
it	O
,	O
benefit	O
from	O
GSK	O
.	O
</s>
<s>
The	O
scenegraph	O
is	O
used	O
to	O
do	O
hidden	B-Algorithm
surface	I-Algorithm
determination	I-Algorithm
.	O
</s>
<s>
The	O
way	O
widgets	O
were	O
drawn	O
in	O
GTK	B-Application
(	O
when	O
not	O
using	O
Clutter	B-Language
)	O
,	O
was	O
,	O
that	O
a	O
draw	O
function	O
(	O
part	O
of	O
GDK	B-Language
hence	O
the	O
name	O
(	O
GIMP	O
"	O
Drawing	O
"	O
Kit	O
)	O
)	O
drew	O
everything	O
.	O
</s>
<s>
It	O
was	O
decided	O
for	O
GTK	B-Application
to	O
move	O
to	O
a	O
Cascading	B-Language
Style	I-Language
Sheet	I-Language
(	O
CSS	B-Language
)	O
-based	O
model	O
for	O
how	O
graphical	O
control	O
elements	O
(	O
widgets	O
)	O
are	O
styled	O
(	O
i.e.	O
</s>
<s>
themed/skinned	O
)	O
and	O
rendered	O
.	O
</s>
<s>
In	O
CSS	B-Language
,	O
shadows	O
,	O
borders	O
,	O
padding	O
and	O
style	O
properties	O
have	O
well-defined	O
semantics	B-Application
.	O
</s>
<s>
Some	O
of	O
those	O
semantics	B-Application
are	O
difficult	O
to	O
implement	O
with	O
the	O
old	O
GTK	B-Application
drawing	O
model	O
.	O
</s>
<s>
has	O
been	O
ported	O
to	O
the	O
Meson	B-Application
build	I-Application
system	I-Application
.	O
</s>
<s>
The	O
lower	O
layer	O
is	O
a	O
simple	O
rendering	O
tree	O
of	O
operations	O
;	O
it	O
can	O
be	O
transformed	O
into	O
appropriate	O
rendering	O
commands	O
with	O
minimal	O
state	O
changes	O
,	O
so	O
it	O
gets	O
transformed	O
into	O
the	O
rendering	B-General_Concept
pipeline	I-General_Concept
.	O
</s>
<s>
As	O
of	O
GTK	B-Application
3.90	O
,	O
which	O
is	O
the	O
development	O
version	O
number	O
of	O
what	O
will	O
become	O
GTK	B-Application
4	O
,	O
GSK	O
supports	O
rendering	O
using	O
these	O
back-ends	O
:	O
</s>
<s>
Clutter	B-Language
was	O
released	O
to	O
the	O
public	O
on	O
June	O
22	O
,	O
2006	O
.	O
</s>
<s>
The	O
integration	O
library	O
"	O
clutter-gtk	O
"	O
has	O
been	O
available	O
since	O
2006-11-29	O
.	O
</s>
<s>
At	O
the	O
2nd	O
Desktop	O
Summit	O
in	O
August	O
2011	O
in	O
Berlin	O
there	O
was	O
quite	O
some	O
talk	O
regarding	O
"	O
GTK+	B-Application
4.0	O
and	O
Clutter	B-Language
2.0	O
"	O
.	O
</s>
<s>
In	O
2008	O
developers	O
such	O
as	O
Havoc	O
Pennington	O
were	O
considering	O
to	O
add	O
a	O
scene	O
canvas	O
to	O
GTK	B-Application
,	O
as	O
people	O
outside	O
of	O
GTK	B-Application
were	O
making	O
use	O
of	O
things	O
like	O
Clutter	B-Language
,	O
Pigment	O
,	O
or	O
.	O
</s>
<s>
Before	O
GSK	O
,	O
drawing	O
used	O
to	O
be	O
done	O
by	O
GDK	B-Language
-	O
handling	O
basic	O
rendering	O
such	O
as	O
drawing	O
primitives	O
,	O
raster	B-Algorithm
graphics	I-Algorithm
(	O
bitmaps	O
)	O
,	O
cursors	B-Application
,	O
fonts	O
,	O
as	O
well	O
as	O
window	O
events	O
and	O
drag-and-drop	O
functionality	O
.	O
</s>
<s>
In	O
June	O
2006	O
Clutter	B-Language
,	O
an	O
OpenGL-based	O
'	O
interactive	O
canvas	O
 '	O
library	O
,	O
was	O
released	O
.	O
</s>
<s>
Clutter	B-Language
has	O
its	O
own	O
scene	O
graph	O
,	O
and	O
GNOME	O
developers	O
preferred	O
to	O
use	O
Clutter	B-Language
's	O
scene	O
graph	O
with	O
GTK	B-Application
,	O
facilitated	O
by	O
a	O
library	O
called	O
clutter-gtk	O
.	O
</s>
<s>
Clutter	B-Language
can	O
be	O
embedded	O
into	O
every	O
GNOME	O
application	O
by	O
using	O
the	O
clutter-gtk	O
library	O
.	O
</s>
<s>
The	O
clutter-gtk	O
library	O
provides	O
a	O
GtkClutterEmbed	O
GTK	B-Application
widget	O
which	O
can	O
be	O
used	O
to	O
display	O
a	O
ClutterStage	O
.	O
</s>
<s>
Some	O
thought	O
went	O
into	O
how	O
to	O
merge	O
Clutter	B-Language
and	O
GTK	B-Application
in	O
a	O
better	O
way	O
than	O
the	O
clutter-gtk	O
library	O
.	O
</s>
<s>
In	O
2011	O
,	O
Firefox	B-Application
introduced	O
"	O
Azure	O
"	O
and	O
Joe	O
Drew	O
and	O
Bas	O
Schouten	O
bothered	O
with	O
some	O
explanations	O
.	O
</s>
<s>
At	O
GUADEC2013	O
in	O
Brno	O
Emmanuele	O
shared	O
his	O
idea	O
on	O
implementing	O
a	O
scene	O
graph	O
and	O
an	O
animation	O
framework	O
inside	O
the	O
GNOME	O
platform	O
(	O
after	O
working	O
for	O
the	O
past	O
6	O
years	O
on	O
Clutter	B-Language
)	O
.	O
</s>
<s>
GTK	B-Language
Scene	I-Language
Graph	I-Language
Kit	I-Language
(	O
GSK	O
)	O
is	O
the	O
forthcoming	O
scene	O
graph	O
for	O
GTK	B-Application
in	O
the	O
process	O
of	O
being	O
written	O
by	O
Emanuele	O
Bassi	O
.	O
</s>
<s>
On	O
30	O
July	O
2014	O
,	O
Emanuelle	O
stated	O
that	O
he	O
thought	O
there	O
should	O
n't	O
be	O
a	O
stand-alone	O
Clutter	B-Language
2.0	O
.	O
</s>
<s>
There	O
was	O
a	O
presentation	O
at	O
the	O
2014	O
Developer	O
Experience	O
Hackfest	O
regarding	O
a	O
new	O
scene	O
graph	O
for	O
GTK	B-Application
aimed	O
at	O
being	O
merged	O
into	O
GTK+	O
3.16	O
.	O
</s>
<s>
Then	O
GSK	O
was	O
planned	O
to	O
be	O
ready	O
and	O
fully	O
integrated	O
into	O
GTK+	B-Application
version	O
3.20	O
,	O
to	O
be	O
released	O
in	O
March	O
2016	O
.	O
</s>
<s>
Having	O
OpenGL	B-Application
(	O
or	O
OpenGL	B-Application
ES	I-Application
)	O
support	O
in	O
GDK	B-Language
facilitates	O
a	O
slightly	O
better	O
control	O
of	O
the	O
graphics	B-General_Concept
pipeline	I-General_Concept
;	O
OpenGL	B-Application
is	O
well	O
suited	O
for	O
compositing	O
textured	O
data	O
but	O
totally	O
unsuited	O
for	O
drawing	O
.	O
</s>
<s>
Enlightenment	B-Library
Foundation	I-Library
Libraries	I-Library
has	O
been	O
using	O
a	O
scene	O
graph	O
since	O
2000	O
,	O
implemented	O
in	O
the	O
Evas	O
library	O
.	O
</s>
<s>
Qt	B-Language
has	O
been	O
redesigned	O
,	O
and	O
starting	O
with	O
version	O
5	O
,	O
it	O
features	O
Qt	B-Language
Quick	O
2	O
with	O
scenegraph	O
based	O
rendering	O
.	O
</s>
