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commit-timing-v1: Add new protocol

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Add a new protocol for adding timestamps to wayland surface state to
allow deferring processing until later.

Signed-off-by: Derek Foreman <derek.foreman@collabora.com>
This commit is contained in:
Derek Foreman 2023-10-04 12:30:30 -05:00
parent 1ccc5748ac
commit 37a1560cf6
3 changed files with 129 additions and 0 deletions
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1
meson.build
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@ -41,6 +41,7 @@ unstable_protocols = {
}
staging_protocols = {
'commit-timing': ['v1'],
'content-type': ['v1'],
'cursor-shape': ['v1'],
'drm-lease': ['v1'],

4
staging/commit-timing/README Normal file
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@ -0,0 +1,4 @@
Commit Timing Protocol
Maintainers:
Derek Foreman <derek.foreman@collabora.com> (@derekf)

124
staging/commit-timing/commit-timing-v1.xml Normal file
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@ -0,0 +1,124 @@
<?xml version="1.0" encoding="UTF-8"?>
<protocol name="commit_timing_v1">
<copyright>
Copyright © 2023 Valve Corporation
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
</copyright>
<interface name="wp_commit_timing_manager_v1" version="1">
<description summary="commit timing">
When a compositor latches on to new content updates it will check for
any number of requirements of the available content updates (such as
fences of all buffers being signalled) to consider the update ready.
This protocol provides a method for adding a time constraint to surface
content. This constraint indicates to the compositor that a content
update should be presented as closely as possible to, but not before,
a specified time.
This protocol does not change the Wayland property that content
updates are applied in the order they are received, even when some
content updates contain timestamps and others do not.
To provide timestamps, this global factory interface must be used to
acquire a wp_commit_timing_v1 object for a surface, which may then be
used to provide timestamp information for commits.
Warning! The protocol described in this file is currently in the testing
phase. Backward compatible changes may be added together with the
corresponding interface version bump. Backward incompatible changes can
only be done by creating a new major version of the extension.
</description>
<enum name="error">
<entry name="commit_timer_exists" value="0"
summary="commit timer already exists for surface"/>
</enum>
<request name="destroy" type="destructor">
<description summary="unbind from the commit timing interface">
Informs the server that the client will no longer be using
this protocol object. Existing objects created by this object
are not affected.
</description>
</request>
<request name="get_timer">
<description summary="request commit timer interface for surface">
Establish a timing controller for a surface.
Only one commit timer can be created for a surface, or a
commit_timer_exists protocol error will be generated.
</description>
<arg name="id" type="new_id" interface="wp_commit_timer_v1"/>
<arg name="surface" type="object" interface="wl_surface"/>
</request>
</interface>
<interface name="wp_commit_timer_v1" version="1">
<description summary="Surface commit timer">
An object to set a time constraint for a content update on a surface.
</description>
<enum name="error">
<entry name="invalid_timestamp" value="0"
summary="timestamp contains an invalid value"/>
<entry name="timestamp_exists" value="1"
summary="timestamp exists"/>
<entry name="surface_destroyed" value="2"
summary="the associated surface no longer exists"/>
</enum>
<request name="set_timestamp">
<description summary="Specify time the following commit takes effect">
Provide a timing constraint for a surface content update.
A set_timestamp request may be made before a wl_surface.commit to
tell the compositor that the content is intended to be presented
as closely as possible to, but not before, the specified time.
The time is in the domain of the compositor's presentation clock.
An invalid_timestamp error will be generated for invalid tv_nsec.
If a timestamp already exists on the surface, a timestamp_exists
error is generated.
Requesting set_timestamp after the commit_timer object's surface is
destroyed will generate a "surface_destroyed" error.
</description>
<arg name="tv_sec_hi" type="uint"
summary="high 32 bits of the seconds part of target time"/>
<arg name="tv_sec_lo" type="uint"
summary="low 32 bits of the seconds part of target time"/>
<arg name="tv_nsec" type="uint"
summary="nanoseconds part of target time"/>
</request>
<request name="destroy" type="destructor">
<description summary="Destroy the timer">
Informs the server that the client will no longer be using
this protocol object.
Existing timing constraints are not affected by the destruction.
</description>
</request>
</interface>
</protocol>