The 3D mouse only worked on Linux, through spacenavd. This adds a second
backend that reads the device directly over USB through hidapi, with no
3Dconnexion driver or SDK: the route to Windows and macOS (discussion
#599), and usable on Linux without spacenavd.
SpaceMouseHid decodes the raw reports from the device's own report
descriptor -- where each axis and button sits, its range, absolute or
relative -- so no per-model table is needed, with the classic report
1/2/3 layout as a fallback when the descriptor cannot be read and the
0x1c button list newer devices send. Absolute axes are rescaled to
+-500 exactly as spacenavd does, so both backends give QET the same
values. HidBackend polls from the main thread (fast while moving, slow
when still), emits one sample per poll, and looks for a device every 3 s
so plugging one in or back in needs no restart.
QET_SPACEMOUSE_BACKEND (auto, spnav, hid) picks the backend; auto keeps
libspnav on Linux when it is found and uses hidapi otherwise. hidapi is
found through pkg-config as hidapi-hidraw (Linux) or hidapi (MSYS2,
Homebrew).
A sample arriving in the same millisecond as the previous one now counts
for no time instead of a full period, so a burst of queued samples no
longer moves the view further than the time it covers.
Tested without a device: tst_spacemousehid (descriptor parsing, broken
and hostile descriptors, every report form, recordings from real devices
once they are added to fixtures/spacemouse), and end to end on Linux
through a virtual USB device created with /dev/uhid: the same moves give
byte-identical screenshots through the hidapi and libspnav backends, an
absolute axis is rescaled as spacenavd does, buttons trigger their
bound action, and unplugging and replugging while QET runs (including
with a dialog open that a device button opened) reconnects cleanly.
Not tested on Windows, macOS or real hardware.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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