829b10c245
When a present request is received, Xwayland will check if there is an
existing request targeting the same window and msc and scrap the older
request if so. Alas, this does not interact well the older fence-based
or newer syncobj-based synchronization features of the Present
extension.
Since execution of a request may be delayed for an unknown length of
time while waiting for a fence to be signaled, the target msc computed
upon receiving a request may not match the actual msc at which the
request is executed. Therefore, we cannot determine in advance whether a
more recently received request will make an older request redundant.
This change removes the code to scrap pending present requests.
We must also ensure requests are executed in the correct order even if
their fences are signaled out of order. To achieve this, whenever
execution of a request needs to wait for a fence, execution of any
later-received requests will be blocked until the earlier request is
ready. The blocked requests will be added to a list tracked in the
xwl_present_window struct. Once the earlier request's fence is signaled,
any blocked requests will be re-executed.
Signed-off-by: Erik Kurzinger <ekurzinger@nvidia.com>
Part-of: <https://gitlab.freedesktop.org/xorg/xserver/-/merge_requests/967>
(cherry picked from commit
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X Server
The X server accepts requests from client applications to create windows, which are (normally rectangular) "virtual screens" that the client program can draw into.
Windows are then composed on the actual screen by the X server (or by a separate composite manager) as directed by the window manager, which usually communicates with the user via graphical controls such as buttons and draggable titlebars and borders.
For a comprehensive overview of X Server and X Window System, consult the following article: https://en.wikipedia.org/wiki/X_server
All questions regarding this software should be directed at the Xorg mailing list:
https://lists.freedesktop.org/mailman/listinfo/xorg
The primary development code repository can be found at:
https://gitlab.freedesktop.org/xorg/xserver
For patch submission instructions, see:
https://www.x.org/wiki/Development/Documentation/SubmittingPatches
As with other projects hosted on freedesktop.org, X.Org follows its Code of Conduct, based on the Contributor Covenant. Please conduct yourself in a respectful and civilized manner when using the above mailing lists, bug trackers, etc: