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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>
70 lines
2.1 KiB
C++
70 lines
2.1 KiB
C++
/*
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Copyright 2006-2026 The QElectroTech Team
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This file is part of QElectroTech.
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QElectroTech is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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QElectroTech is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef HIDBACKEND_H
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#define HIDBACKEND_H
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#include "spacemousebackend.h"
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#include "spacemousehid.h"
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class QTimer;
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struct hid_device_;
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/**
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@brief The HidBackend class
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SpaceMouseBackend that reads the device directly over USB through
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hidapi, with no 3Dconnexion driver or SDK: the backend for Windows and
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macOS, and for Linux without spacenavd. Only compiled in when
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QET_SPACEMOUSE_BACKEND_HID is defined (cmake/find_spacemouse.cmake).
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The raw reports are decoded by SpaceMouseHid, from the device's own
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report descriptor, into the same values spacenavd would give.
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hidapi has no event to wait on, so the device is polled from the main
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thread: fast while it is moving, slowly once it has been still for a
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moment. With no device, it looks for one every few seconds, so plugging
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one in works without restarting QElectroTech. As with every backend,
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no device is the normal case and is never reported as an error.
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*/
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class HidBackend : public SpaceMouseBackend
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{
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Q_OBJECT
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public:
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explicit HidBackend(QObject *parent = nullptr);
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~HidBackend() override;
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bool isAvailable() const override { return m_device != nullptr; }
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private slots:
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void scan();
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void readReports();
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private:
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void close();
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bool m_hid_initialised = false;
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hid_device_ *m_device = nullptr;
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SpaceMouseHid::Decoder m_decoder;
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QTimer *m_scan_timer = nullptr;
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QTimer *m_read_timer = nullptr;
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int m_idle_polls = 0;
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bool m_reading = false;
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};
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#endif // HIDBACKEND_H
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