We use surfaceless contexts with internal windows. We also require
the EGL_KHR_surfaceless_context extension for making context current
without outputs.
Arguably, we could use pbuffers, but since mainstream drivers (Mesa and
NVIDIA) support surfaceless contexts, the extra complexity doesn't buy
us anything.
When the last output gets disconnected, create a virtual output as a
placeholder until we have access to a physical output again. While
this placecholder never gets rendered to, with virtual outputs in
general that is possible (with gbm and qpainter atm) and can be done
for future use cases like wireless displays.
CCBUG: 420160
CCBUG: 438839
Makes it possible to apply the dpms settings per screen instead of
applying it to all of them, which is wrong at many levels.
Will be even more important with other effects like rotation.
Currently, the entire screen will be repainted when using the qpainter
render backend. With this change, kwin will repaint only the dirty parts
on the screen.
A better alternative is to return the damage region in the beginFrame()
function. This way, the render backend can force full screen repaints or
indicate what parts of the buffer needs to be repainted (for buffer age)
The main motivation behind the split is to simplify client buffer code
and allow adding new features easier, for example referencing the shm
pool when a shm buffer is destroyed, or monitoring for readable linux
dmabuf file descriptors, etc.
Also, a referenced ClientBuffer cannot be destroyed, unlike the old
BufferInterface.
DrmPipeline is now what contains all the thing related to drm calls,
instead of DrmOutput. This allows for some more flexibility and tidies
the code up a bit. Additionally instead of rolling back changes if
presentation fails, changes are directly tested with atomic test only
commits.
While always calling showCursor isn't a problem for when there's no
pointing device as the cursor image is empty in that case, it can
cause a temporarily stuck cursor image when it's supposed to be
hidden because of touch input
If a wl_eglstream buffer is attached to a surface, but then later a different
type of buffer, such as a dmabuf, is attached to the same surface, kwin will
mistakenly keep trying to acquire frames from the EGLStream associated with the
previous buffer. This can happen if an Xwayland window is made full-screen
causing it to switch to the flipping presentation path, for instance. The
result is that the window contents will no longer be updated.
Instead, the eglstream backend's loadTexture and updateTexture functions should
first pass the buffer to eglCreateStreamAttribNV. If it fails with
EGL_BAD_STREAM_KHR, that indicates it is indeed a wl_eglstream, and that we've
already associated a server-side EGLStream with it in attachStreamConsumer, so
we can proceed as usual. If it fails with EGL_BAD_ACCESS, though, that
indicates it is not a wl_eglstream and we should fall back to the parent class
which handles attaching other buffer types. If it doesn't fail at all, that
means the client tried to attach a new wl_eglstream to a surface without first
attaching the stream consumer. There's not really a great way to handle this,
so just re-use the previous EGLStream.
Putting the OpenGL post processing rotation into its own class cleans
the EglGbmBackend code up a bit and adds post processing rotation for
the EglStreamBackend
It seems like without a surface creation of the scene fails somehow. At
least until the exact problem is solved, update outputs for EglStream
gpus before creating the EglStreamBackend.
BUG: 438363
