Currently, we use glFinish() to ensure that stream consumers don't see
corrupted or rather incomplete buffers. This is a serious issue because
glFinish() not only prevents the gpu from processing new GL commands,
but it also blocks the compositor.
This change addresses the blocking issue by using native fences. With
the proposed change, after finishing recording a frame, a fence is
inserted in the command stream. When the native fence is signaled, the
pending pipewire buffer will be enqueued.
If the EGL_ANDROID_native_fence_sync extension is not supported, we'll
fall back to using glFinish().
Besides being unused, we should avoid making OpenGL contexts current
against the EGLSurface of the first output because it's a slippery road
that may end up in leaking context-specific resources in the mid of a
compositing restart.
On Wayland, internal windows that use OpenGL are rendered into fbos,
which are later handed over to kwin. In order to achieve that, our QPA
creates OpenGL contexts that share resources with the scene's context.
The problems start when compositing has been restarted. If user changes
any compositing settings, the underlying render backend will be
reinitialized and with it, the scene's context will be destroyed. Thus,
we no longer can accept framebuffer objects from internal windows.
This change addresses the framebuffer object sharing problem by adding
a so called global share context. It persists throughout the lifetime of
kwin. It can never be made current. The scene context and all contexts
created in our QPA share resources with it.
Therefore we can destroy the scene OpenGL context without affecting
OpenGL contexts owned by internal windows, e.g. the outline visual or
tabbox.
It's worth noting that Qt provides a way to create a global share
context. But for our purposes it's not suitable since the share
context must be known when QGuiApplication attempts to instantiate a
QOpenGLContext object. At that moment, the backend is not initialized
and thus the EGLDisplay is not available yet.
BUG: 415798
Every time Platform::supportsQpaContext() is called, we go through the
list of supported extensions and perform a string comparison op. This is
not really cheap.
Commit e459c8bf54 added a sanity check to
prevent recomputing the texture matrix if the y-inverted hint hasn't been
changed, which is totally reasonable!
However, code that initializes dmabuf textures implicitly assumes that
calling setYInverted() always results in updating the matrix. But it may
be not the case if the passed value matches current isYInverted().
This change adds missing calls to force updating the texture matrix.
Note that we don't need to check the buffer size every time the dmabuf
image has been modified externally because the window pixmap is going to
be re-created if the dimensions of the attached buffer have changed.
I've seen some reports on the internet about Firefox displaying garbage
instead of videos. 99% that bug is caused by this issue. But it seems
like Firefox no longer displays corrupted videos on my machine, so it's
hard to tell.
Uses a setter and clear method pattern rather than having the code
repeated.
Instead of keeping a QPointer, now we are a QObject and we get notified
about destruction intention directly, so we can clear the pointer when
necessary.
Summary:
Notify the driver about the parts of the screen that will be repainted.
In some cases this can be benefitial. This is especially useful on lima
and panfrost devices (e.g. pinephone, pinebook, pinebook pro).
Test Plan:
Tested on a pinebook pro with a late mesa version.
Basically I implemented it, then it didn't work and I fixed it.
Maybe next step we want to look into our damage algorithm.
The main advantage of SPDX license identifiers over the traditional
license headers is that it's more difficult to overlook inappropriate
licenses for kwin, for example GPL 3. We also don't have to copy a
lot of boilerplate text.
In order to create this change, I ran licensedigger -r -c from the
toplevel source directory.
The wp_viewporter compositor extension allows clients to crop and scale
their surfaces. It can be especially useful for applications wishing to
reduce their power consumption, e.g. video players, etc.
Given that there is no any direct relationship between the surface size
and the buffer size anymore, we have to use specialized helper methods
for converting coordinates from the surface-local space to buffer pixel
space and vice versa.
The recommended way to get all EGL extension defines is to include
EGL/eglext.h. EGL/eglmesaext.h is a private header that compositors
should not use.
BUG: 422131
Summary:
Removes a few TODO items mentioning that some code was exactly the same
in a couple of different places.
drm: Remove unnecessary cast
Test Plan:
Using it right now
Will push in 2 different commits
Reviewers: #kwin, zzag
Reviewed By: #kwin, zzag
Subscribers: zzag, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D28708
Summary:
We leak memory if we do not destroy the dmabuf implementation on EGL backend
going down.
Also this makes sure everything is cleaned up on shutdown.
FIXED-IN: 5.17.4
BUG: 413637
Test Plan: Compiles, settings change and shutdown ok.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: davidedmundson, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D25577
Summary:
The EGL platform might go away at any time through reconfiguration or because
of a graphic error. KWin then resets the graphics. The dmabuf implementation
must respect that and recover from a graphics reset by recreating all EGL
images for existing buffer.
This assumes that we won't change our graphics API mid-session and that
supported plane and modifier configuration stays constant.
In practise we remember all current dmabufs in a single map and only remove
them if the client did destroy the resource.
BUG: 411980
CCBUG: 413403
FIXED-IN: 5.17.2
Test Plan: Applied screenedge configuration without crash.
Reviewers: #kwin, zzag
Reviewed By: #kwin, zzag
Subscribers: fvogt, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D24954
Summary:
So far wayland was used by internal clients to submit raster buffers
and position themselves on the screen. While we didn't have issues with
submitting raster buffers, there were some problems with positioning
task switchers. Mostly, because we had effectively two paths that may
alter geometry.
A better approach to deal with internal clients is to let our QPA use
kwin core api directly. This way we can eliminate unnecessary roundtrips
as well make geometry handling much easier and comprehensible.
The last missing piece is shadows. Both Plasma::Dialog and Breeze widget
style use platform-specific APIs to set and unset shadows. We need to
add shadows API to KWindowSystem. Even though some internal clients lack
drop-shadows at the moment, I don't consider it to be a blocker. We can
add shadows back later on.
CCBUG: 386304
Reviewers: #kwin, davidedmundson, romangg
Reviewed By: #kwin, romangg
Subscribers: romangg, kwin
Tags: #kwin
Maniphest Tasks: T9600
Differential Revision: https://phabricator.kde.org/D22810
Summary:
Switch to Q_ASSERT in order to make code a bit more consistent. We have
places where both assert and Q_ASSERT are used next to each other. Also,
distributions like Ubuntu don't strip away assert(), let's hope that
things are a bit different with Q_ASSERT.
Test Plan: Compiles.
Reviewers: #kwin, davidedmundson
Reviewed By: #kwin, davidedmundson
Subscribers: romangg, davidedmundson, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D23605
Summary: This adds support for LinuxDmabufUnstableV1Interface in kwin.
Test Plan: Session starts. `weston-simple-dmabuf-egl` and `weston-simple-dmabuf-drm` execute without errors.
Reviewers: #kwin, #plasma, davidedmundson, mart, graesslin, fredrik
Subscribers: meven, zzag, romangg, anthonyfieroni, plasma-devel, kwin
Tags: #kwin
Maniphest Tasks: T8067
Differential Revision: https://phabricator.kde.org/D10750
Summary:
QRegion::rects was deprecated in Qt 5.11. It is advised to use begin()
and end() methods instead.
Reviewers: #kwin, romangg
Reviewed By: #kwin, romangg
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D22353
Summary: Shm textures via Gl must be reloaded in case their size changes.
Test Plan: testShmBufferSizeChangeOnSubSurface passes.
Reviewers: #kwin, graesslin
Reviewed By: #kwin, graesslin
Subscribers: davidedmundson, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D18453
Summary:
This patch implements using EGL_IMG_context_priority to request
high-priority rendering contexts if the extension is available.
EGL_IMG_context_priority is currently used in this fashion by
e.g. Android's SurfaceFlinger (RenderEngine.cpp) and libweston
(gl-renderer.c) and seems promising given this widespread
acceptance.
Reviewers: #kwin, graesslin, romangg, davidedmundson
Subscribers: kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D11572
Summary:
Unfortunately a rather large change which required more refactoring than
initially expected. The main problem was that some parts needed to go
into platformsupport so that the platform plugins can link them. Due to
the rather monolithic nature of scene_opengl.h a few changes were
required:
* SceneOpenGL::Texture -> SceneOpenGLTexture
* SceneOpenGL::TexturePrivate -> SceneOpenGLTexturePrivate
* texture based code into dedicated files
* SwapProfiler code into dedicated files
* SwapProfiler only used in x11 variants
* Safety checks for OpenGL scene moved into the new plugin
* signal declared in SceneOpenGL moved to Scene, so that we don't need
to include SceneOpenGL in composite
Test Plan: Nested OpenGL compositor works
Reviewers: #kwin, #plasma
Subscribers: plasma-devel, kwin
Tags: #kwin
Differential Revision: https://phabricator.kde.org/D7740
