Copyright © 2021 Xaver Hugl 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. This global is a factory interface, allowing clients to request the compositor to use asynchronous page flips on a per-surface basis. 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 tearing_control_exists protocol error. 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. Destroy this tearing control factory object. Other objects, including gamescope_surface_tearing_control_v1 objects created by this factory, shall not be affected by this request. Instantiate an interface extension for the given wl_surface to request asynchronous page flips for presentation. If the given wl_surface already has a gamescope_surface_tearing_control_v1 object associated, the tearing_control_exists protocol error is raised. An additional interface to a wl_surface object, which allows the client to hint to the compositor if and when it should use asynchronous page flips for presentation. This enum provides information for if and when submitted frames from the client may be presented with tearing. The possible values are: VSYNC: Presentation should be synchronized to the vertical retrace by the display hardware so that tearing doesn't happen. VSYNC_RELAXED: Presentation should be synchronized to the vertical retrace by the display hardware so that tearing doesn't happen as long as the client submits new frame fast enough. If a frame is late for presentation, that is, if more than one vertical retrace has occurred since the last commit then the compositor should use asynchronous page flips to immediately present the frame. This may cause visible tearing. The compositor is encouraged to send requested frame callbacks as soon as possible after such a late commit to make sure clients have as much time as possible to render their next frame. ASYNC: Presentation should not be synchronized to the vertical retrace, committed frames are meant to be immediately presented with asynchronous page flips with as little delay as possible. Tearing will be visible. The compositor is encouraged to send requested frame callbacks as soon as possible after every commit. Set the presentation hint for the associated wl_surface. See presentation_hint for the description. This state is double-buffered and is applied on the next wl_surface.commit. The compositor is free to dynamically respect or ignore this hint based on various conditions, including GPU capabilities and surface window state. Destroy this surface tearing object and remove the presentation hint. The change will be applied on the next wl_surface.commit.