256 lines
12 KiB
XML
256 lines
12 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
|
|
<protocol name="zwp_linux_explicit_synchronization_unstable_v1">
|
|
|
|
<copyright>
|
|
Copyright 2016 The Chromium Authors
|
|
Copyright 2017 Intel Corporation
|
|
Copyright 2018 Collabora, Ltd
|
|
|
|
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="zwp_linux_explicit_synchronization_v1" version="2">
|
|
<description summary="protocol for providing explicit synchronization">
|
|
This global is a factory interface, allowing clients to request
|
|
explicit synchronization for buffers on a per-surface basis.
|
|
|
|
See zwp_linux_surface_synchronization_v1 for more information.
|
|
|
|
This interface is derived from Chromium's
|
|
zcr_linux_explicit_synchronization_v1.
|
|
|
|
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 'z' prefix and the
|
|
version number in the protocol and interface names are removed and the
|
|
interface version number is reset.
|
|
</description>
|
|
|
|
<request name="destroy" type="destructor">
|
|
<description summary="destroy explicit synchronization factory object">
|
|
Destroy this explicit synchronization factory object. Other objects,
|
|
including zwp_linux_surface_synchronization_v1 objects created by this
|
|
factory, shall not be affected by this request.
|
|
</description>
|
|
</request>
|
|
|
|
<enum name="error">
|
|
<entry name="synchronization_exists" value="0"
|
|
summary="the surface already has a synchronization object associated"/>
|
|
</enum>
|
|
|
|
<request name="get_synchronization">
|
|
<description summary="extend surface interface for explicit synchronization">
|
|
Instantiate an interface extension for the given wl_surface to provide
|
|
explicit synchronization.
|
|
|
|
If the given wl_surface already has an explicit synchronization object
|
|
associated, the synchronization_exists protocol error is raised.
|
|
|
|
Graphics APIs, like EGL or Vulkan, that manage the buffer queue and
|
|
commits of a wl_surface themselves, are likely to be using this
|
|
extension internally. If a client is using such an API for a
|
|
wl_surface, it should not directly use this extension on that surface,
|
|
to avoid raising a synchronization_exists protocol error.
|
|
</description>
|
|
|
|
<arg name="id" type="new_id"
|
|
interface="zwp_linux_surface_synchronization_v1"
|
|
summary="the new synchronization interface id"/>
|
|
<arg name="surface" type="object" interface="wl_surface"
|
|
summary="the surface"/>
|
|
</request>
|
|
</interface>
|
|
|
|
<interface name="zwp_linux_surface_synchronization_v1" version="2">
|
|
<description summary="per-surface explicit synchronization support">
|
|
This object implements per-surface explicit synchronization.
|
|
|
|
Synchronization refers to co-ordination of pipelined operations performed
|
|
on buffers. Most GPU clients will schedule an asynchronous operation to
|
|
render to the buffer, then immediately send the buffer to the compositor
|
|
to be attached to a surface.
|
|
|
|
In implicit synchronization, ensuring that the rendering operation is
|
|
complete before the compositor displays the buffer is an implementation
|
|
detail handled by either the kernel or userspace graphics driver.
|
|
|
|
By contrast, in explicit synchronization, dma_fence objects mark when the
|
|
asynchronous operations are complete. When submitting a buffer, the
|
|
client provides an acquire fence which will be waited on before the
|
|
compositor accesses the buffer. The Wayland server, through a
|
|
zwp_linux_buffer_release_v1 object, will inform the client with an event
|
|
which may be accompanied by a release fence, when the compositor will no
|
|
longer access the buffer contents due to the specific commit that
|
|
requested the release event.
|
|
|
|
Each surface can be associated with only one object of this interface at
|
|
any time.
|
|
|
|
In version 1 of this interface, explicit synchronization is only
|
|
guaranteed to be supported for buffers created with any version of the
|
|
wp_linux_dmabuf buffer factory. Version 2 additionally guarantees
|
|
explicit synchronization support for opaque EGL buffers, which is a type
|
|
of platform specific buffers described in the EGL_WL_bind_wayland_display
|
|
extension. Compositors are free to support explicit synchronization for
|
|
additional buffer types.
|
|
</description>
|
|
|
|
<request name="destroy" type="destructor">
|
|
<description summary="destroy synchronization object">
|
|
Destroy this explicit synchronization object.
|
|
|
|
Any fence set by this object with set_acquire_fence since the last
|
|
commit will be discarded by the server. Any fences set by this object
|
|
before the last commit are not affected.
|
|
|
|
zwp_linux_buffer_release_v1 objects created by this object are not
|
|
affected by this request.
|
|
</description>
|
|
</request>
|
|
|
|
<enum name="error">
|
|
<entry name="invalid_fence" value="0"
|
|
summary="the fence specified by the client could not be imported"/>
|
|
<entry name="duplicate_fence" value="1"
|
|
summary="multiple fences added for a single surface commit"/>
|
|
<entry name="duplicate_release" value="2"
|
|
summary="multiple releases added for a single surface commit"/>
|
|
<entry name="no_surface" value="3"
|
|
summary="the associated wl_surface was destroyed"/>
|
|
<entry name="unsupported_buffer" value="4"
|
|
summary="the buffer does not support explicit synchronization"/>
|
|
<entry name="no_buffer" value="5"
|
|
summary="no buffer was attached"/>
|
|
</enum>
|
|
|
|
<request name="set_acquire_fence">
|
|
<description summary="set the acquire fence">
|
|
Set the acquire fence that must be signaled before the compositor
|
|
may sample from the buffer attached with wl_surface.attach. The fence
|
|
is a dma_fence kernel object.
|
|
|
|
The acquire fence is double-buffered state, and will be applied on the
|
|
next wl_surface.commit request for the associated surface. Thus, it
|
|
applies only to the buffer that is attached to the surface at commit
|
|
time.
|
|
|
|
If the provided fd is not a valid dma_fence fd, then an INVALID_FENCE
|
|
error is raised.
|
|
|
|
If a fence has already been attached during the same commit cycle, a
|
|
DUPLICATE_FENCE error is raised.
|
|
|
|
If the associated wl_surface was destroyed, a NO_SURFACE error is
|
|
raised.
|
|
|
|
If at surface commit time the attached buffer does not support explicit
|
|
synchronization, an UNSUPPORTED_BUFFER error is raised.
|
|
|
|
If at surface commit time there is no buffer attached, a NO_BUFFER
|
|
error is raised.
|
|
</description>
|
|
<arg name="fd" type="fd" summary="acquire fence fd"/>
|
|
</request>
|
|
|
|
<request name="get_release">
|
|
<description summary="release fence for last-attached buffer">
|
|
Create a listener for the release of the buffer attached by the
|
|
client with wl_surface.attach. See zwp_linux_buffer_release_v1
|
|
documentation for more information.
|
|
|
|
The release object is double-buffered state, and will be associated
|
|
with the buffer that is attached to the surface at wl_surface.commit
|
|
time.
|
|
|
|
If a zwp_linux_buffer_release_v1 object has already been requested for
|
|
the surface in the same commit cycle, a DUPLICATE_RELEASE error is
|
|
raised.
|
|
|
|
If the associated wl_surface was destroyed, a NO_SURFACE error
|
|
is raised.
|
|
|
|
If at surface commit time there is no buffer attached, a NO_BUFFER
|
|
error is raised.
|
|
</description>
|
|
<arg name="release" type="new_id" interface="zwp_linux_buffer_release_v1"
|
|
summary="new zwp_linux_buffer_release_v1 object"/>
|
|
</request>
|
|
</interface>
|
|
|
|
<interface name="zwp_linux_buffer_release_v1" version="1">
|
|
<description summary="buffer release explicit synchronization">
|
|
This object is instantiated in response to a
|
|
zwp_linux_surface_synchronization_v1.get_release request.
|
|
|
|
It provides an alternative to wl_buffer.release events, providing a
|
|
unique release from a single wl_surface.commit request. The release event
|
|
also supports explicit synchronization, providing a fence FD for the
|
|
client to synchronize against.
|
|
|
|
Exactly one event, either a fenced_release or an immediate_release, will
|
|
be emitted for the wl_surface.commit request. The compositor can choose
|
|
release by release which event it uses.
|
|
|
|
This event does not replace wl_buffer.release events; servers are still
|
|
required to send those events.
|
|
|
|
Once a buffer release object has delivered a 'fenced_release' or an
|
|
'immediate_release' event it is automatically destroyed.
|
|
</description>
|
|
|
|
<event name="fenced_release">
|
|
<description summary="release buffer with fence">
|
|
Sent when the compositor has finalised its usage of the associated
|
|
buffer for the relevant commit, providing a dma_fence which will be
|
|
signaled when all operations by the compositor on that buffer for that
|
|
commit have finished.
|
|
|
|
Once the fence has signaled, and assuming the associated buffer is not
|
|
pending release from other wl_surface.commit requests, no additional
|
|
explicit or implicit synchronization is required to safely reuse or
|
|
destroy the buffer.
|
|
|
|
This event destroys the zwp_linux_buffer_release_v1 object.
|
|
</description>
|
|
<arg name="fence" type="fd" summary="fence for last operation on buffer"/>
|
|
</event>
|
|
|
|
<event name="immediate_release">
|
|
<description summary="release buffer immediately">
|
|
Sent when the compositor has finalised its usage of the associated
|
|
buffer for the relevant commit, and either performed no operations
|
|
using it, or has a guarantee that all its operations on that buffer for
|
|
that commit have finished.
|
|
|
|
Once this event is received, and assuming the associated buffer is not
|
|
pending release from other wl_surface.commit requests, no additional
|
|
explicit or implicit synchronization is required to safely reuse or
|
|
destroy the buffer.
|
|
|
|
This event destroys the zwp_linux_buffer_release_v1 object.
|
|
</description>
|
|
</event>
|
|
</interface>
|
|
|
|
</protocol> |