Replaces the functionality of the WaylandBackend and makes it available
to all backends by providing the functionality directly in
AbstractBackend. By default a backend is not ready and the implementation
must call setReady(true) to indicate that setup has finished
successfully. The compositor won't start till the backend indicates that
it is ready.
The aim is to be able to create a plugin for each of the backends.
The following directories are created:
* backends/drm
* backends/fbdev
* backends/wayland
* backends/x11
Each available mode on the connector is added to the
KWayland::Server::OutputInterface for the DrmOutput.
The logic to calculate the refreshRate is highly inspired from Weston's
implementation in compositor-drm.c.
Documentation for the wonderful EDID format can be found at:
http://read.pudn.com/downloads110/ebook/456020/E-EDID%20Standard.pdf
In case the link breaks: wikipedia also has a good section on it.
We read out the following information:
* EISA code (3 characters)
* serial number
* monitor name (up to 12 characters)
* physical size (stored in cm)
Unfortunately the EDID information cannot be trusted at all.
My 24" screen reports a sice of 16x9 cm. So we need to provide users
a way to overwrite the broken data in an easy way through kwinrc
[EdidOverwrite][EISA code/maker name][monitor name][serial number]
PhysicalSize=trueWidthInMM,trueHeightInMM
Unfortunately monitor name is not a sufficient enough identifier, that's
why serial number is also used. This makes automatic distribution of
overwrites difficult. But in the example above the monitor name is
"SyncMaster" which is a rather broad field in Samsung :-(
The extracted information from EDID is also used to set the corresponding
fields in KWayland::Server::OutputInterface.
Requires to move the screensQueried signal and disconnect during
Application startup.
As Screens only hold the geometry of each screen and the overall
geometry, there is no need (yet) to update in more detail when a
DrmOutput is added or removed. The overall queried is sufficient.
The DrmBackend installs a UdevMonitor to listen for output hotplug
events. Whenever a hotplug event occurrs the resources are queried
again and a signal is emitted for each removed and added output.
The complete rendering is now splitted per output including present which
means that we only need to make the context per output current once per
rendering.
Unfortunately our architecture does not properly support gathering the
damage for multiple outputs. In fact the damage information is lost after
the first output got rendered. Thus we currently only support buffer age
for the first output, on other outputs full repaints are caused.
For each DrmOutput a gbm_surface and EglSurface is created. When
rendering per screen the context is made current on each of the
surfaces.
Note: viewport handling needs to be improved by e.g. passing through
the scene to restore to correct viewport after dropping an FBO.
Furthermore it seems like buffer age is not working correctly in this
setup (not overly surprising).
Dynamic changes are not yet supported.
For each DrmOutput a set of buffers is created and presented. The
renderig is still in one go and not synced to the individual screens.
Dynamic changes are not yet supported.
The backend can indicate that the rendering needs to be split per screen.
In that case it has to provide a different rendering buffer per screen.
The painting in the scene is adjusted to either take a splitted path
or the existing path for all screens in one go.
Includes better error handling for when page flip failed. If it fails,
we shouldn't set the current buffer as otherwise each new attempt to
present a buffer will fail, too.
* blocks compositor while session is inactive
* prevents page flips while session is inactive
* restores modes when going to inactive
* hides cursor when going to inactive
* blanks screens when going active
* shows cursor again when going active
* triggers a repaint when going active
This change is motivated by the fact that we need to suspend libinput
before switching the virtual terminal. Also we don't want to take over
libinput if we do not have a VirtualTerminal created - in windowed mode
we don't want libinput to be started. So binding it to the backends which
create the VirtualTerminal makes sense.
The KWin::Application gains a new signal virtualTerminalCreated which is
emitted from VirtualTerminal once it's properly setup. This is used by
Input to create Libinput integration instead of binding it to logind.
Furthermore Libinput gets suspended when the VirtualTerminal reports that
it is no longer active. For re-activation we still just use logind's
session active property.
The DrmOutput corresponds to one output we perform mode setting on.
This implies that page flip is now performed on the DrmOutput. As our
compositor cannot drive multiple outputs yet, we only use the first one
and call into bufferSwapComplete and aboutToBufferSwap when either all
page flips are completed or respectivly the first one is performed.
Setting cursor is also handled on each DrmOutput.
When the DrmOutput is initialized it is blanked with a black buffer which
gets destroyed once the first page flip event has occurred (meanig the
buffer is no longer needed). Before setting the black buffer we store the
current buffer which will be set back on tear down. Because of that
tearing down the DrmBackend needs to wait till all page flips ended.
Creates two buffers with the size queried through the drm capabilities.
The actual cursor image is retrieved using the software cursor
functionality from the AbstractBackend and rendered into the shared
memory buffer. The the buffer is set as the new cursor image and the
rendering buffer for the cursor is swapped.
The position is updated whenever the cursor image changes or the mouse
position changes.
Uses EGL_MESA_platform_gbm to get an EglDisplay from a gbm_device.
The DrmBackend can provide a DrmBuffer for a gbm_surface and present
it.
Unfortunately buffer age seems to be slightly broken and we still have
artefacts.
Introduces a new (optional) dependency: libdrm.
The DrmBackend currently supports finding the first connected output.
It can create shared memory buffers which are used by SceneQPainter to
do double buffered rendering.
There is still lots to do, the following things are not yet working:
* multiple outputs
* page flip
* OpenGL (through gbm)
* restoring mode setting to start value
