With QtQuick2 it's possible that the scene graph rendering context either
lives in an own thread or uses the main GUI thread. In the latter case
it's the same thread as our compositing OpenGL context lives in. This
means our basic assumption that between two rendering passes the context
stays current does not hold.
The code already ensured that before we start a rendering pass the
context is made current, but there are many more possible cases. If we
use OpenGL in areas not triggered by the rendering loop but in response
to other events the context needs to be made current. This includes the
loading and unloading of effects (some effects use OpenGL in the static
effect check, in the ctor and dtor), background loading of texture data,
lazy loading after first usage invoked by shortcut, etc. etc.
To properly handle these cases new methods are added to EffectsHandler
to make the compositing OpenGL context current. These calls delegate down
into the scene. On non-OpenGL scenes they are noop, but on OpenGL they go
into the backend and make the context current. In addition they ensure
that Qt doesn't think that it's QOpenGLContext is current by calling
doneCurrent() on the QOpenGLContext::currentContext(). This unfortunately
causes an additional call to makeCurrent with a null context, but there
is no other way to tell Qt - it doesn't notice when a different context
is made current with low level API calls. In the multi-threaded
architecture this doesn't matter as ::currentContext() returns null.
A short evaluation showed that a transition to QOpenGLContext doesn't
seem feasible. Qt only supports either GLX or EGL while KWin supports
both and when entering the transition phase for Wayland, it would become
extremely tricky if our native platform is X11, but we want a Wayland
EGL context. A future solution might be to have a "KWin-QPA plugin" which
uses either xcb or Wayland and hides everything from Qt.
The API documentation is extended to describe when the effects-framework
ensures that an OpenGL context is current. The effects are changed to
make the context current in cases where it's not guaranteed. This has
been done by looking for creation or deletion of GLTextures and Shaders.
If there are other OpenGL usages outside the rendering loop, ctor/dtor
this needs to be changed, too.
It's basically a run of the port-cmake.sh script in here, mostly the changes
are the following:
- Using KF5::* targets
- Using the proper macros, following recent developments in frameworks
Hiding and Showing the close window button all the time can result in
the window not having a proper content. To fix this issue we keep the
window around, but just don't show it. For this the CloseWindowView
inherits from QObject and delegates the needed calls to the nested
QQuickView.
As KWin indirectly uses Qt's OpenGL through QtQuick we need to ensure
to not mix OpenGL and OpenGLES. So we have to built KWin only against
OpenGL if Qt is built against OpenGL and we have to built KWin only
against GLESv2 if Qt is built against GLESv2.
This means the kwin_gles binary is no more. There is only kwin which
either links GL or GLESv2.
with 4 instead of just altering the default value
It seems the value is actually written for some ppl.
Worse: former patch didn't actually work as expected
anymore
CCBUG: 321897
That's what you get for changing code you cannot properly test. The
calculation was completely messed up. Now reads the correct byte size
for the byte array. In addition the usages in the effects are improved
to cast the data into the proper uint32_t values instead of the more
generic long. After all if the format is 32, the length is 32 and not
a long.
compensated by a QuartOut shape, this keeps the
effect alive while the sheet or similar effects run
without much visual stretch
Covers issue until there's AnimationEffect::determine()
CCBUG: 321897
semi Fixed in 4.11.2
REVIEW: 111798
When a window is added while the effect is running
it shall either be highlighted or hidden, but not exit
the effect what happened, because the property notification
is invoked to test whether the window has a highlight
property (questionable since the effect is running, but
valid - could be different X11 client) and that routine
exits the effect if no property is found (assuming it was
withdrawn)
REVIEW: 112494
Thomas Lübking
l10n daemon script
Martin Gräßlin
Raul Fernandes
Aleix Pol
Aurélien Gâteau
Sebastian Kügler
Bhushan Shah
C Schell
Montel Laurent
Anselmo L. S. Melo