<?xml version="1.0" encoding="UTF-8"?>
<protocol name="vsync_feedback_unstable_v1">
<copyright>
Copyright 2016 The Chromium Authors
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>
<description summary="Protocol for providing vertical synchronization timing">
This protocol specifies a set of interfaces used to inform the client about
vertical synchronization timing in a precise way and without unnecessary
overhead.
Warning! The protocol described in this file is experimental and backward
incompatible changes may be made. Backward compatible changes may be added
together with the corresponding interface version bump. Backward
incompatible changes are done by bumping the version number in the protocol
and interface names and resetting the interface version. Once the protocol
is to be declared stable, the version number in the protocol is removed and
the interface version number is reset.
</description>
<interface name="zcr_vsync_feedback_v1" version="1">
<description summary="Protocol for providing vertical synchronization timing">
The global interface that allows clients to subscribe for vertical
synchronization timing data for given wl_output.
</description>
<request name="destroy" type="destructor">
<description summary="destroy vsync feedback object">
Destroy this vsync feedback object. Existing vsync timing objects shall
not be affected by this request.
</description>
</request>
<request name="get_vsync_timing">
<description summary="get vsync timing object for given wl_output">
Create a new vsync timing object that represents a subscription to
vertical synchronization timing updates of given wl_output object.
The newly created object will immediately signal an update to notify
the subscriber of initial timing parameters.
</description>
<arg name="id" type="new_id" interface="zcr_vsync_timing_v1" summary="the new vsync timing interface id"/>
<arg name="output" type="object" interface="wl_output" summary="the wl_output object to subscribe for timings of" allow-null="true"/>
</request>
</interface>
<interface name="zcr_vsync_timing_v1" version="1">
<request name="destroy" type="destructor">
<description summary="destroy vsync timing object">
Destroy this vsync timing object.
</description>
</request>
<event name="update">
<description summary="vsync timing updated">
Notifies client that vertical synchronization timing of given wl_output
has changed.
Timing information consists of two data, timebase and interval. Timebase
is an absolute timestamp of the vsync event that caused the timing to
change. Interval is a period of time between subsequent vsync events.
The unit of all above mentioned time values shall be microseconds and
absolute timestamps should match the realm of the primary system
monotonic counter, i.e. the POSIX clock_gettime(CLOCK_MONOTONIC). Data
type of both values is defined to be a 64-bit unsigned integer, but
since the biggest unsigned integer datatype defined by the Wayland
protocol is the 32-bit uint, both timebase and interval are split into
most significant and least significant part, suffixed by "_h" and "_l"
respectively.
</description>
<arg name="timebase_l" type="uint" summary="new vsync timebase (lower 32 bits)"/>
<arg name="timebase_h" type="uint" summary="new vsync timebase (upper 32 bits)"/>
<arg name="interval_l" type="uint" summary="new vsync interval (lower 32 bits)"/>
<arg name="interval_h" type="uint" summary="new vsync interval (upper 32 bits)"/>
</event>
</interface>
</protocol>
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