Reference

Protocol Documentation

• Wayland protocol documentation
• Tablet protocol XML, unstable, v2
• Wayland pointer protocol documentation (for touchpad input and fallback emulation)
• Wayland touch protocol documentation (for touchscreen input)

Reference Implementations

Name	Role	URLs
wlroots	Server library	Documentation: https://github.com/swaywm/wlroots https://github.com/swaywm/wlroots/wiki/Getting-started https://drewdevault.com/2018/07/17/Input-handling-in-wlroots.html Commits: 2285e36b0c10 ("Add zwp-tablet-unstable-v2 client support") 47a30957d1ce ("backend/wayland: scale tablet tool position into [0, 1] range") Files: https://github.com/swaywm/wlroots/blob/master/backend/wayland/tablet_v2.c
Mutter	Server	Files: https://gitlab.gnome.org/GNOME/mutter/-/blob/master/src/wayland/meta-wayland-tablet-manager.c https://gitlab.gnome.org/GNOME/mutter/-/blob/master/src/wayland/meta-wayland-tablet-seat.c https://gitlab.gnome.org/GNOME/mutter/-/blob/master/src/wayland/meta-wayland-tablet.c https://gitlab.gnome.org/GNOME/mutter/-/blob/master/src/wayland/meta-wayland-tablet-tool.c https://gitlab.gnome.org/GNOME/mutter/-/blob/master/src/wayland/meta-wayland-tablet-pad.c https://gitlab.gnome.org/GNOME/mutter/-/blob/master/src/wayland/meta-wayland-tablet-pad-group.c https://gitlab.gnome.org/GNOME/mutter/-/blob/master/src/wayland/meta-wayland-tablet-pad-ring.c https://gitlab.gnome.org/GNOME/mutter/-/blob/master/src/wayland/meta-wayland-tablet-pad-strip.c
Sway	Server (based on wlroots)	Commits: 9114d3b84cf4 ("Implement tablet tool support") 7e420cb6e4a3 ("input: Add support for tablet protocol.") Files: https://github.com/swaywm/sway/blob/master/sway/input/tablet.c https://github.com/swaywm/sway/blob/master/sway/input/cursor.c https://github.com/swaywm/sway/blob/master/sway/input/seat.c
KWin	Server	Commits: f5a73b87e3e7 ("Initial support for tablets on Wayland") f6128ec8757b ("Provide a fake approach to tablet event propagation") e0052cedcb9c ("Implement the tablet wayland protocol in kwin") 43969122a2b1 ("Remove changes from a patch from the future") 6abd23ed0220 ("Make it possible to have a separate cursor for the tablet") 89fca06bdb26 ("Make sure tablet coordinates take decorations into account") 3a85b57ec2ab ("Send out an additional TabletMove event before TabletPress.") 1ad88bdf7c65 ("tablet: acknowledge that findTabletSeat might return nullptr") Files: https://invent.kde.org/plasma/kwin/-/blob/master/input.cpp https://invent.kde.org/plasma/kwin/-/blob/master/input_event.cpp https://invent.kde.org/plasma/kwin/-/blob/master/tablet_input.cpp https://invent.kde.org/plasma/kwin/-/blob/master/libinput/device.cpp https://invent.kde.org/plasma/kwin/-/blob/master/libinput/connection.cpp
Xwayland	Client	Files: https://gitlab.freedesktop.org/xorg/xserver/-/blob/master/hw/xwayland/xwayland-input.c
GTK+3 / GDK	Client	Files: https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gdk/wayland/gdkdevice-wayland.c https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gdk/gdkevents.c https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gdk/gdkdevicetool.c https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gdk/gdkdevicepad.c https://gitlab.gnome.org/GNOME/gtk/-/blob/master/gtk/gtkpadcontroller.c
Qt	Client	Commits: 222455cd643c ("Client: Add basic support for tablet-unstable-v2") Files: https://github.com/qt/qtwayland/blob/dev/src/client/qwaylandtabletv2.cpp

Miscellaneous

Chrome OS Stylus Protocol (non-recommended "alternative" to the tablet protocol available only on Chrome OS).