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The desktop forced a software cursor (WLR_NO_HARDWARE_CURSORS=1) because
labwc's cursor never showed when handed to the app's compositor. With a
software cursor wlroots never scans out: every frame of a full-screen game
was composited by labwc first ("Direct scan-out disabled by software
cursor", 2284 times in one Adreno 825 report).
Why the cursor never showed: wlroots' Wayland backend attaches and commits
its cursor surface before wl_pointer.set_cursor gives it the cursor role,
and sets it again with nothing new committed each time the pointer enters.
The compositor released a role-less surface's buffer on commit, so the
cursor surface had no image by the time it became the cursor.
- A role-less surface's last buffer (cursor-sized only) is held until the
next commit; set_cursor publishes it, and a repeat set_cursor of the
surface already shown unhides its last image.
- A dma-buf cursor is read back after the client's implicit render fence,
as the zero-copy path waits for it.
- The desktop no longer forces a software cursor.
Device-tested on the AYN Thor (Adreno 740, 1920x1080): labwc's own cursor
is drawn, with its shapes (I-beam over a terminal); wlroots logs "Direct
scan-out enabled" for a full-screen glxgears. At the same 60 fps on screen
the GPU is 3.0 % busy against 4.6 % with the software cursor, both at
550 MHz.
DroidDeck brings the SteamOS experience to Android: Valve's Steam client in Big Picture on your Adreno handheld, with Windows games through Valve's ARM64 Proton.
Requirements and install
Use Android 9 or newer on a supported Adreno device (730 or newer, or 8xx). Mali, Xclipse, PowerVR, and Adreno 710 are unsupported. No root is required. Allow about 3 GB for the runtime and 1.1 GB more for the desktop and emulators. Install the APK from Releases, install the Linux runtime, then press Play and sign in. Steam downloads on first launch. Install Desktop & apps to use the desktop and emulators.
On Android 12+, if Steam exits without a log, turn off Restrict child processes in Developer options.
Build
Run tools/build_local.sh with Docker, Java 17, the Android SDK/NDK, and zstd installed. It builds the ARM64 audio sinks from PulseAudio 13.0 and packages them into the APK at app/build/outputs/apk/release/app-release.apk. Set DROIDDECK_PA13_SOURCE_DIR to an existing PulseAudio 13.0 source directory to skip downloading it. To install the APK on an attached device, run tools/deploy_local.sh.
Limits
Compatibility and performance vary by device; hardware validation is limited. Desktop compositing uses software rendering. Firefox sandboxing is reduced under proot. See the session logs in Download/DroidDeck/ when diagnosing problems.
Credits and licence
GPL-3.0. Runtime, shim, input, and controller work build on WinNative and Bannerlator (maxjivi05). See LICENSE. Steam and Proton belong to Valve Corporation; this project is not affiliated with Valve.