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feat(nescope): open the compositor

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A headless Wayland compositor for a single fullscreen client, and the second
component into this repo. Imported as a tree from `nestrilabs/nescope` for the
same reason as the last one: the upstream repo is private, its history has never
been reviewed for publication, and a squash is what keeps that history from
becoming permanent here.

Wired to the workspace — versions from the root, `nesprotocol` by path instead
of a sibling directory. 8 tests pass.

It knows a lot about Steam, and all of it stays. `steam_app_*` window classes,
a launcher that exits before the game it started, a client that shows a login
screen with no Vulkan frames in it: that is third-party behaviour a compositor
for games has to handle, and describing it reveals nothing about how we are put
together. The rule is about topology, not vocabulary.

Two comments still name the transport by its old name and are left for the
commit that renames it, so that rename reads as one change rather than as
noise spread across four imports.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Wanjohi
2026-08-26 18:01:41 +03:00
parent 938f5e6544
commit 37dd985810
21 changed files with 6744 additions and 0 deletions
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194
apps/nescope/src/protocols/gamescope-swapchain.xml Normal file
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<?xml version="1.0" encoding="UTF-8"?>
<protocol name="gamescope_swapchain">
<copyright>
Copyright © 2023 Joshua Ashton for Valve Software
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="gamescope-specific swapchain protocol">
This is a private Gamescope protocol. Regular Wayland clients must not use
it.
</description>
<interface name="gamescope_swapchain_factory_v2" version="1">
<request name="destroy" type="destructor"></request>
<request name="create_swapchain">
<description summary="create Gamescope swapchain interface">
</description>
<arg name="surface" type="object" interface="wl_surface"
summary="target surface"/>
<arg name="callback" type="new_id" interface="gamescope_swapchain"
summary="new swapchain object"/>
</request>
</interface>
<interface name="gamescope_swapchain" version="1">
<request name="destroy" type="destructor"></request>
<request name="override_window_content">
<description summary="override an X11's window wl_surface">
Xwayland creates a wl_surface for each X11 window. It sends a
WL_SURFACE_ID client message to indicate the mapping between the X11
windows and the wl_surface objects.
This request overrides this mapping for a given X11 window, allowing an
X11 client to submit buffers via the Wayland protocol. The override
only affects buffer submission. Everything else (e.g. input events)
still uses Xwayland's WL_SURFACE_ID.
x11_server is gotten by the GAMESCOPE_XWAYLAND_SERVER_ID property on the
root window of the associated server.
</description>
<arg name="gamescope_xwayland_server_id" type="uint" summary="gamescope xwayland server ID"/>
<arg name="x11_window" type="uint" summary="X11 window ID"/>
</request>
<request name="swapchain_feedback">
<description summary="provide swapchain feedback">
Provide swapchain feedback to the compositor.
This is what the useless tearing protocol should have been.
Absolutely not enough information in the final protocol to do what we want for SteamOS --
which is have the Allow Tearing toggle apply to *both* Mailbox + Immediate and NOT fifo,
essentially acting as an override for tearing on/off for games.
The upstream protocol is very useless for our usecase here.
Provides image count ahead of time instead of needing to try and calculate it from
an initial stall if we are doing low latency.
Provides colorspace info for us to do HDR for both HDR10 PQ and scRGB.
The upstream HDR efforts seem to have no interest in supporting scRGB but we *need* that so /shrug
We can do it here now! Yipee!
Swapchain feedback solves so many problems! :D
</description>
<arg name="image_count" type="uint" summary="image count of swapchain"/>
<arg name="vk_format" type="uint" summary="VkFormat of swapchain"/>
<arg name="vk_colorspace" type="uint" summary="VkColorSpaceKHR of swapchain"/>
<arg name="vk_composite_alpha" type="uint" summary="VkCompositeAlphaFlagBitsKHR of swapchain"/>
<arg name="vk_pre_transform" type="uint" summary="VkSurfaceTransformFlagBitsKHR of swapchain"/>
<arg name="vk_clipped" type="uint" summary="clipped (VkBool32) of swapchain"/>
<arg name="vk_engine_name" type="string" summary="Engine name"/>
</request>
<request name="set_present_mode">
<description summary="Add a fifo queue constraint"/>
<arg name="vk_present_mode" type="uint" summary="VkPresentModeKHR"/>
</request>
<request name="set_hdr_metadata">
<description summary="set HDR metadata for a surface">
Forward HDR metadata from Vulkan to the compositor.
HDR Metadata Infoframe as per CTA 861.G spec.
This is expected to match exactly with the spec.
display_primary_*:
Color Primaries of the Data.
Specifies X and Y coordinates.
These are coded as unsigned 16-bit values in units of
0.00002, where 0x0000 represents zero and 0xC350
represents 1.0000.
white_point_*:
White Point of Colorspace Data.
Specifies X and Y coordinates.
These are coded as unsigned 16-bit values in units of
0.00002, where 0x0000 represents zero and 0xC350
represents 1.0000.
max_display_mastering_luminance:
Max Mastering Display Luminance.
This value is coded as an unsigned 16-bit value in units of 1 cd/m2,
where 0x0001 represents 1 cd/m2 and 0xFFFF represents 65535 cd/m2.
max_display_mastering_luminance:
Min Mastering Display Luminance.
This value is coded as an unsigned 16-bit value in units of
0.0001 cd/m2, where 0x0001 represents 0.0001 cd/m2 and 0xFFFF
represents 6.5535 cd/m2.
max_cll:
Max Content Light Level.
This value is coded as an unsigned 16-bit value in units of 1 cd/m2,
where 0x0001 represents 1 cd/m2 and 0xFFFF represents 65535 cd/m2.
max_fall:
Max Frame Average Light Level.
This value is coded as an unsigned 16-bit value in units of 1 cd/m2,
where 0x0001 represents 1 cd/m2 and 0xFFFF represents 65535 cd/m2.
</description>
<arg name="display_primary_red_x" type="uint" summary="red primary x coordinate"/>
<arg name="display_primary_red_y" type="uint" summary="red primary y coordinate"/>
<arg name="display_primary_green_x" type="uint" summary="green primary x coordinate"/>
<arg name="display_primary_green_y" type="uint" summary="green primary y coordinate"/>
<arg name="display_primary_blue_x" type="uint" summary="blue primary x coordinate"/>
<arg name="display_primary_blue_y" type="uint" summary="blue primary y coordinate"/>
<arg name="white_point_x" type="uint" summary="white point x coordinate"/>
<arg name="white_point_y" type="uint" summary="white point y coordinate"/>
<arg name="max_display_mastering_luminance" type="uint" summary="max display mastering luminance"/>
<arg name="min_display_mastering_luminance" type="uint" summary="min display mastering luminance"/>
<arg name="max_cll" type="uint" summary="max content light level"/>
<arg name="max_fall" type="uint" summary="max frame average light level"/>
</request>
<request name="set_present_time">
<description summary="display timing of next commit">
Sets the display timing of the next commit.
This gets reset to 0s in the compositor's state after a commit.
</description>
<arg name="present_id" type="uint" summary="application provided presentation id"/>
<arg name="desired_present_time_hi" type="uint" summary="high part of the desired presentation time for this commit. Uses CLOCK_MONOTONIC. 0 = present as soon as possible."/>
<arg name="desired_present_time_lo" type="uint" summary="low part of the desired presentation time for this commit. Uses CLOCK_MONOTONIC. 0 = present as soon as possible."/>
</request>
<event name="past_present_timing">
<description summary="information about past presentation">
Gives information on the past presentation timing
</description>
<arg name="present_id" type="uint" summary="application provided presentation id"/>
<arg name="desired_present_time_hi" type="uint" summary="high part of the desired presentation time for the commit. (from the app)"/>
<arg name="desired_present_time_lo" type="uint" summary="low part of the desired presentation time for the commit. (from the app)"/>
<arg name="actual_present_time_hi" type="uint" summary="high part of the actual present time for this commit."/>
<arg name="actual_present_time_lo" type="uint" summary="low part of the actual present time for this commit."/>
<arg name="earliest_present_time_hi" type="uint" summary="high part of the refresh time that Gamescope thought this commit was done by."/>
<arg name="earliest_present_time_lo" type="uint" summary="low part of the refresh time that Gamescope thought this commit was done by."/>
<arg name="present_margin_hi" type="uint" summary="high part of the difference between earliest present time and the earliest latch time"/>
<arg name="present_margin_lo" type="uint" summary="low part of the difference between earliest present time and the earliest latch time"/>
</event>
<event name="refresh_cycle">
<description summary="information about refresh cycle for this swapchain">
Gives information on the refresh cycle for this swapchain
</description>
<arg name="refresh_cycle_hi" type="uint" summary="high part of the refresh cycle in nanos"/>
<arg name="refresh_cycle_lo" type="uint" summary="low part of the refresh cycle in nanos"/>
</event>
<event name="retired">
<description summary="Swapchain was remotely retired"></description>
</event>
</interface>
</protocol>

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apps/nescope/src/protocols/mod.rs Normal file
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//! Generated Wayland protocol bindings for the gamescope swapchain protocol.
#![allow(non_upper_case_globals, non_camel_case_types, unused)]
use smithay::reexports::wayland_server;
use wayland_server::protocol::*;
pub mod __interfaces {
use super::wayland_server;
use wayland_server::backend as wayland_backend;
use wayland_server::protocol::__interfaces::*;
wayland_scanner::generate_interfaces!("src/protocols/gamescope-swapchain.xml");
}
use self::__interfaces::*;
wayland_scanner::generate_server_code!("src/protocols/gamescope-swapchain.xml");