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During GDC and general testing on Steam Deck units, we found that single gamepads would often register inputs twice under certain circumstances. This was caused by SteamInput creating a new virtual device, which Godot registers as a second gamepad. This resulted in two gamepad devices reporting the same button presses, often leading to buggy input response on games with no multi-device logic and other-wise could cause intended Steam rebindings to not work as intended (for example, swapping o and x on a playstation pad if that feature isn't supported by the game.) SDL gets around this by taking in a list of devices that are to be ignored. When valve sees a controller that wants to be rebound via SteamInput, they push a new VID/PID entry onto the environment variable `SDL_GAMECONTROLLER_IGNORE_DEVICES` for the original gamepad so that all game inputs can be read from the virtual gamepad instead. This leverages the same logic as we are already using SDL gamepad related HID mappings.
605 lines
18 KiB
C++
605 lines
18 KiB
C++
/**************************************************************************/
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/* joypad_linux.cpp */
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/**************************************************************************/
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/* This file is part of: */
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/* GODOT ENGINE */
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/* https://godotengine.org */
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/**************************************************************************/
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/* Copyright (c) 2014-present Godot Engine contributors (see AUTHORS.md). */
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur. */
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/* */
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/* Permission is hereby granted, free of charge, to any person obtaining */
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/* a copy of this software and associated documentation files (the */
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/* "Software"), to deal in the Software without restriction, including */
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/* without limitation the rights to use, copy, modify, merge, publish, */
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/* distribute, sublicense, and/or sell copies of the Software, and to */
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/* permit persons to whom the Software is furnished to do so, subject to */
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/* the following conditions: */
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/* */
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/* The above copyright notice and this permission notice shall be */
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/* included in all copies or substantial portions of the Software. */
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/* */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, */
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/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF */
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/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. */
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/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY */
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, */
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/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE */
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */
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/**************************************************************************/
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#ifdef JOYDEV_ENABLED
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#include "joypad_linux.h"
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#include "core/os/os.h"
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <linux/input.h>
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#include <unistd.h>
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#ifdef UDEV_ENABLED
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#ifdef SOWRAP_ENABLED
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#include "libudev-so_wrap.h"
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#else
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#include <libudev.h>
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#endif
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#endif
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#define LONG_BITS (sizeof(long) * 8)
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#define test_bit(nr, addr) (((1UL << ((nr) % LONG_BITS)) & ((addr)[(nr) / LONG_BITS])) != 0)
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#define NBITS(x) ((((x)-1) / LONG_BITS) + 1)
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#ifdef UDEV_ENABLED
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static const char *ignore_str = "/dev/input/js";
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#endif
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JoypadLinux::Joypad::~Joypad() {
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for (int i = 0; i < MAX_ABS; i++) {
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if (abs_info[i]) {
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memdelete(abs_info[i]);
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}
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}
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}
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void JoypadLinux::Joypad::reset() {
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dpad = 0;
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fd = -1;
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for (int i = 0; i < MAX_ABS; i++) {
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abs_map[i] = -1;
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curr_axis[i] = 0;
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}
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events.clear();
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}
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#ifdef UDEV_ENABLED
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// This function is derived from SDL:
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// https://github.com/libsdl-org/SDL/blob/main/src/core/linux/SDL_sandbox.c#L28-L45
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static bool detect_sandbox() {
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if (access("/.flatpak-info", F_OK) == 0) {
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return true;
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}
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// For Snap, we check multiple variables because they might be set for
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// unrelated reasons. This is the same thing WebKitGTK does.
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if (OS::get_singleton()->has_environment("SNAP") && OS::get_singleton()->has_environment("SNAP_NAME") && OS::get_singleton()->has_environment("SNAP_REVISION")) {
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return true;
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}
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if (access("/run/host/container-manager", F_OK) == 0) {
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return true;
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}
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return false;
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}
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#endif // UDEV_ENABLED
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JoypadLinux::JoypadLinux(Input *in) {
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#ifdef UDEV_ENABLED
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#ifdef SOWRAP_ENABLED
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#ifdef DEBUG_ENABLED
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int dylibloader_verbose = 1;
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#else
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int dylibloader_verbose = 0;
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#endif
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if (detect_sandbox()) {
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// Linux binaries in sandboxes / containers need special handling because
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// libudev doesn't work there. So we need to fallback to manual parsing
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// of /dev/input in such case.
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use_udev = false;
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print_verbose("JoypadLinux: udev enabled, but detected incompatible sandboxed mode. Falling back to /dev/input to detect joypads.");
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} else {
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use_udev = initialize_libudev(dylibloader_verbose) == 0;
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if (use_udev) {
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if (!udev_new || !udev_unref || !udev_enumerate_new || !udev_enumerate_add_match_subsystem || !udev_enumerate_scan_devices || !udev_enumerate_get_list_entry || !udev_list_entry_get_next || !udev_list_entry_get_name || !udev_device_new_from_syspath || !udev_device_get_devnode || !udev_device_get_action || !udev_device_unref || !udev_enumerate_unref || !udev_monitor_new_from_netlink || !udev_monitor_filter_add_match_subsystem_devtype || !udev_monitor_enable_receiving || !udev_monitor_get_fd || !udev_monitor_receive_device || !udev_monitor_unref) {
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// There's no API to check version, check if functions are available instead.
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use_udev = false;
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print_verbose("JoypadLinux: Unsupported udev library version!");
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} else {
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print_verbose("JoypadLinux: udev enabled and loaded successfully.");
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}
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} else {
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print_verbose("JoypadLinux: udev enabled, but couldn't be loaded. Falling back to /dev/input to detect joypads.");
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}
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}
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#endif
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#else
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print_verbose("JoypadLinux: udev disabled, parsing /dev/input to detect joypads.");
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#endif
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input = in;
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monitor_joypads_thread.start(monitor_joypads_thread_func, this);
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joypad_events_thread.start(joypad_events_thread_func, this);
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}
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JoypadLinux::~JoypadLinux() {
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monitor_joypads_exit.set();
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joypad_events_exit.set();
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monitor_joypads_thread.wait_to_finish();
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joypad_events_thread.wait_to_finish();
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close_joypads();
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}
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void JoypadLinux::monitor_joypads_thread_func(void *p_user) {
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if (p_user) {
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JoypadLinux *joy = static_cast<JoypadLinux *>(p_user);
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joy->monitor_joypads_thread_run();
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}
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}
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void JoypadLinux::monitor_joypads_thread_run() {
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#ifdef UDEV_ENABLED
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if (use_udev) {
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udev *_udev = udev_new();
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if (!_udev) {
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use_udev = false;
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ERR_PRINT("Failed getting an udev context, falling back to parsing /dev/input.");
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monitor_joypads();
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} else {
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enumerate_joypads(_udev);
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monitor_joypads(_udev);
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udev_unref(_udev);
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}
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} else {
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monitor_joypads();
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}
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#else
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monitor_joypads();
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#endif
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}
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#ifdef UDEV_ENABLED
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void JoypadLinux::enumerate_joypads(udev *p_udev) {
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udev_enumerate *enumerate;
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udev_list_entry *devices, *dev_list_entry;
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udev_device *dev;
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enumerate = udev_enumerate_new(p_udev);
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udev_enumerate_add_match_subsystem(enumerate, "input");
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udev_enumerate_scan_devices(enumerate);
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devices = udev_enumerate_get_list_entry(enumerate);
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udev_list_entry_foreach(dev_list_entry, devices) {
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const char *path = udev_list_entry_get_name(dev_list_entry);
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dev = udev_device_new_from_syspath(p_udev, path);
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const char *devnode = udev_device_get_devnode(dev);
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if (devnode) {
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String devnode_str = devnode;
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if (devnode_str.find(ignore_str) == -1) {
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open_joypad(devnode);
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}
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}
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udev_device_unref(dev);
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}
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udev_enumerate_unref(enumerate);
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}
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void JoypadLinux::monitor_joypads(udev *p_udev) {
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udev_device *dev = nullptr;
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udev_monitor *mon = udev_monitor_new_from_netlink(p_udev, "udev");
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udev_monitor_filter_add_match_subsystem_devtype(mon, "input", nullptr);
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udev_monitor_enable_receiving(mon);
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int fd = udev_monitor_get_fd(mon);
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while (!monitor_joypads_exit.is_set()) {
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fd_set fds;
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struct timeval tv;
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int ret;
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FD_ZERO(&fds);
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FD_SET(fd, &fds);
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tv.tv_sec = 0;
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tv.tv_usec = 0;
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ret = select(fd + 1, &fds, nullptr, nullptr, &tv);
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/* Check if our file descriptor has received data. */
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if (ret > 0 && FD_ISSET(fd, &fds)) {
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/* Make the call to receive the device.
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select() ensured that this will not block. */
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dev = udev_monitor_receive_device(mon);
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if (dev && udev_device_get_devnode(dev) != nullptr) {
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String action = udev_device_get_action(dev);
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const char *devnode = udev_device_get_devnode(dev);
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if (devnode) {
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String devnode_str = devnode;
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if (devnode_str.find(ignore_str) == -1) {
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if (action == "add") {
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open_joypad(devnode);
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} else if (String(action) == "remove") {
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close_joypad(devnode);
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}
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}
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}
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udev_device_unref(dev);
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}
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}
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usleep(50000);
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}
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udev_monitor_unref(mon);
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}
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#endif
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void JoypadLinux::monitor_joypads() {
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while (!monitor_joypads_exit.is_set()) {
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DIR *input_directory;
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input_directory = opendir("/dev/input");
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if (input_directory) {
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struct dirent *current;
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char fname[64];
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while ((current = readdir(input_directory)) != nullptr) {
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if (strncmp(current->d_name, "event", 5) != 0) {
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continue;
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}
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sprintf(fname, "/dev/input/%.*s", 16, current->d_name);
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if (attached_devices.find(fname) == -1) {
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open_joypad(fname);
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}
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}
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}
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closedir(input_directory);
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usleep(1000000); // 1s
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}
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}
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void JoypadLinux::close_joypads() {
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for (int i = 0; i < JOYPADS_MAX; i++) {
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MutexLock lock(joypads_mutex[i]);
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Joypad &joypad = joypads[i];
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close_joypad(joypad, i);
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}
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}
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void JoypadLinux::close_joypad(const char *p_devpath) {
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for (int i = 0; i < JOYPADS_MAX; i++) {
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MutexLock lock(joypads_mutex[i]);
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Joypad &joypad = joypads[i];
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if (joypads[i].devpath == p_devpath) {
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close_joypad(joypad, i);
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}
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}
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}
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void JoypadLinux::close_joypad(Joypad &p_joypad, int p_id) {
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if (p_joypad.fd != -1) {
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close(p_joypad.fd);
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p_joypad.fd = -1;
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attached_devices.erase(p_joypad.devpath);
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input->joy_connection_changed(p_id, false, "");
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}
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p_joypad.events.clear();
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}
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static String _hex_str(uint8_t p_byte) {
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static const char *dict = "0123456789abcdef";
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char ret[3];
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ret[2] = 0;
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ret[0] = dict[p_byte >> 4];
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ret[1] = dict[p_byte & 0xF];
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return ret;
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}
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void JoypadLinux::setup_joypad_properties(Joypad &p_joypad) {
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unsigned long keybit[NBITS(KEY_MAX)] = { 0 };
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unsigned long absbit[NBITS(ABS_MAX)] = { 0 };
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int num_buttons = 0;
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int num_axes = 0;
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if ((ioctl(p_joypad.fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
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(ioctl(p_joypad.fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0)) {
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return;
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}
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for (int i = BTN_JOYSTICK; i < KEY_MAX; ++i) {
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if (test_bit(i, keybit)) {
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p_joypad.key_map[i] = num_buttons++;
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}
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}
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for (int i = BTN_MISC; i < BTN_JOYSTICK; ++i) {
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if (test_bit(i, keybit)) {
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p_joypad.key_map[i] = num_buttons++;
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}
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}
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for (int i = 0; i < ABS_MISC; ++i) {
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/* Skip hats */
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if (i == ABS_HAT0X) {
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i = ABS_HAT3Y;
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continue;
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}
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if (test_bit(i, absbit)) {
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p_joypad.abs_map[i] = num_axes++;
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p_joypad.abs_info[i] = memnew(input_absinfo);
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if (ioctl(p_joypad.fd, EVIOCGABS(i), p_joypad.abs_info[i]) < 0) {
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memdelete(p_joypad.abs_info[i]);
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p_joypad.abs_info[i] = nullptr;
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}
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}
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}
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p_joypad.force_feedback = false;
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p_joypad.ff_effect_timestamp = 0;
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unsigned long ffbit[NBITS(FF_CNT)];
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if (ioctl(p_joypad.fd, EVIOCGBIT(EV_FF, sizeof(ffbit)), ffbit) != -1) {
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if (test_bit(FF_RUMBLE, ffbit)) {
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p_joypad.force_feedback = true;
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}
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}
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}
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void JoypadLinux::open_joypad(const char *p_path) {
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int joy_num = input->get_unused_joy_id();
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int fd = open(p_path, O_RDWR | O_NONBLOCK);
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if (fd != -1 && joy_num != -1) {
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unsigned long evbit[NBITS(EV_MAX)] = { 0 };
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unsigned long keybit[NBITS(KEY_MAX)] = { 0 };
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unsigned long absbit[NBITS(ABS_MAX)] = { 0 };
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// add to attached devices so we don't try to open it again
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attached_devices.push_back(String(p_path));
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if ((ioctl(fd, EVIOCGBIT(0, sizeof(evbit)), evbit) < 0) ||
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(ioctl(fd, EVIOCGBIT(EV_KEY, sizeof(keybit)), keybit) < 0) ||
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(ioctl(fd, EVIOCGBIT(EV_ABS, sizeof(absbit)), absbit) < 0)) {
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close(fd);
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return;
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}
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// Check if the device supports basic gamepad events
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bool has_abs_left = (test_bit(ABS_X, absbit) && test_bit(ABS_Y, absbit));
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bool has_abs_right = (test_bit(ABS_RX, absbit) && test_bit(ABS_RY, absbit));
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if (!(test_bit(EV_KEY, evbit) && test_bit(EV_ABS, evbit) && (has_abs_left || has_abs_right))) {
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close(fd);
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return;
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}
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char uid[128];
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char namebuf[128];
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String name = "";
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input_id inpid;
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if (ioctl(fd, EVIOCGNAME(sizeof(namebuf)), namebuf) >= 0) {
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name = namebuf;
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}
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if (ioctl(fd, EVIOCGID, &inpid) < 0) {
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close(fd);
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return;
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}
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uint16_t vendor = BSWAP16(inpid.vendor);
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uint16_t product = BSWAP16(inpid.product);
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uint16_t version = BSWAP16(inpid.version);
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if (input->should_ignore_device(vendor, product)) {
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// This can be true in cases where Steam is passing information into the game to ignore
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// original gamepads when using virtual rebindings (See SteamInput).
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return;
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}
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MutexLock lock(joypads_mutex[joy_num]);
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Joypad &joypad = joypads[joy_num];
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joypad.reset();
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joypad.fd = fd;
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joypad.devpath = String(p_path);
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setup_joypad_properties(joypad);
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sprintf(uid, "%04x%04x", BSWAP16(inpid.bustype), 0);
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if (inpid.vendor && inpid.product && inpid.version) {
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sprintf(uid + String(uid).length(), "%04x%04x%04x%04x%04x%04x", vendor, 0, product, 0, version, 0);
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input->joy_connection_changed(joy_num, true, name, uid);
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} else {
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String uidname = uid;
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int uidlen = MIN(name.length(), 11);
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for (int i = 0; i < uidlen; i++) {
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uidname = uidname + _hex_str(name[i]);
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}
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uidname += "00";
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input->joy_connection_changed(joy_num, true, name, uidname);
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}
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}
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}
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void JoypadLinux::joypad_vibration_start(Joypad &p_joypad, float p_weak_magnitude, float p_strong_magnitude, float p_duration, uint64_t p_timestamp) {
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if (!p_joypad.force_feedback || p_joypad.fd == -1 || p_weak_magnitude < 0.f || p_weak_magnitude > 1.f || p_strong_magnitude < 0.f || p_strong_magnitude > 1.f) {
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return;
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}
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if (p_joypad.ff_effect_id != -1) {
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joypad_vibration_stop(p_joypad, p_timestamp);
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}
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struct ff_effect effect;
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effect.type = FF_RUMBLE;
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effect.id = -1;
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effect.u.rumble.weak_magnitude = floor(p_weak_magnitude * (float)0xffff);
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effect.u.rumble.strong_magnitude = floor(p_strong_magnitude * (float)0xffff);
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effect.replay.length = floor(p_duration * 1000);
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effect.replay.delay = 0;
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if (ioctl(p_joypad.fd, EVIOCSFF, &effect) < 0) {
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return;
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}
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|
|
struct input_event play;
|
|
play.type = EV_FF;
|
|
play.code = effect.id;
|
|
play.value = 1;
|
|
if (write(p_joypad.fd, (const void *)&play, sizeof(play)) == -1) {
|
|
print_verbose("Couldn't write to Joypad device.");
|
|
}
|
|
|
|
p_joypad.ff_effect_id = effect.id;
|
|
p_joypad.ff_effect_timestamp = p_timestamp;
|
|
}
|
|
|
|
void JoypadLinux::joypad_vibration_stop(Joypad &p_joypad, uint64_t p_timestamp) {
|
|
if (!p_joypad.force_feedback || p_joypad.fd == -1 || p_joypad.ff_effect_id == -1) {
|
|
return;
|
|
}
|
|
|
|
if (ioctl(p_joypad.fd, EVIOCRMFF, p_joypad.ff_effect_id) < 0) {
|
|
return;
|
|
}
|
|
|
|
p_joypad.ff_effect_id = -1;
|
|
p_joypad.ff_effect_timestamp = p_timestamp;
|
|
}
|
|
|
|
float JoypadLinux::axis_correct(const input_absinfo *p_abs, int p_value) const {
|
|
int min = p_abs->minimum;
|
|
int max = p_abs->maximum;
|
|
// Convert to a value between -1.0f and 1.0f.
|
|
return 2.0f * (p_value - min) / (max - min) - 1.0f;
|
|
}
|
|
|
|
void JoypadLinux::joypad_events_thread_func(void *p_user) {
|
|
if (p_user) {
|
|
JoypadLinux *joy = (JoypadLinux *)p_user;
|
|
joy->joypad_events_thread_run();
|
|
}
|
|
}
|
|
|
|
void JoypadLinux::joypad_events_thread_run() {
|
|
while (!joypad_events_exit.is_set()) {
|
|
bool no_events = true;
|
|
for (int i = 0; i < JOYPADS_MAX; i++) {
|
|
MutexLock lock(joypads_mutex[i]);
|
|
Joypad &joypad = joypads[i];
|
|
if (joypad.fd == -1) {
|
|
continue;
|
|
}
|
|
input_event event;
|
|
while (read(joypad.fd, &event, sizeof(event)) > 0) {
|
|
no_events = false;
|
|
JoypadEvent joypad_event;
|
|
joypad_event.type = event.type;
|
|
joypad_event.code = event.code;
|
|
joypad_event.value = event.value;
|
|
joypad.events.push_back(joypad_event);
|
|
}
|
|
if (errno != EAGAIN) {
|
|
close_joypad(joypad, i);
|
|
}
|
|
}
|
|
if (no_events) {
|
|
usleep(10000); // 10ms
|
|
}
|
|
}
|
|
}
|
|
|
|
void JoypadLinux::process_joypads() {
|
|
for (int i = 0; i < JOYPADS_MAX; i++) {
|
|
MutexLock lock(joypads_mutex[i]);
|
|
Joypad &joypad = joypads[i];
|
|
if (joypad.fd == -1) {
|
|
continue;
|
|
}
|
|
for (uint32_t j = 0; j < joypad.events.size(); j++) {
|
|
const JoypadEvent &joypad_event = joypad.events[j];
|
|
// joypad_event may be tainted and out of MAX_KEY range, which will cause
|
|
// joypad.key_map[joypad_event.code] to crash
|
|
if (joypad_event.code >= MAX_KEY) {
|
|
return;
|
|
}
|
|
|
|
switch (joypad_event.type) {
|
|
case EV_KEY:
|
|
input->joy_button(i, (JoyButton)joypad.key_map[joypad_event.code], joypad_event.value);
|
|
break;
|
|
|
|
case EV_ABS:
|
|
switch (joypad_event.code) {
|
|
case ABS_HAT0X:
|
|
if (joypad_event.value != 0) {
|
|
if (joypad_event.value < 0) {
|
|
joypad.dpad.set_flag(HatMask::LEFT);
|
|
joypad.dpad.clear_flag(HatMask::RIGHT);
|
|
} else {
|
|
joypad.dpad.set_flag(HatMask::RIGHT);
|
|
joypad.dpad.clear_flag(HatMask::LEFT);
|
|
}
|
|
} else {
|
|
joypad.dpad.clear_flag(HatMask::LEFT);
|
|
joypad.dpad.clear_flag(HatMask::RIGHT);
|
|
}
|
|
input->joy_hat(i, joypad.dpad);
|
|
break;
|
|
|
|
case ABS_HAT0Y:
|
|
if (joypad_event.value != 0) {
|
|
if (joypad_event.value < 0) {
|
|
joypad.dpad.set_flag(HatMask::UP);
|
|
joypad.dpad.clear_flag(HatMask::DOWN);
|
|
} else {
|
|
joypad.dpad.set_flag(HatMask::DOWN);
|
|
joypad.dpad.clear_flag(HatMask::UP);
|
|
}
|
|
} else {
|
|
joypad.dpad.clear_flag(HatMask::UP);
|
|
joypad.dpad.clear_flag(HatMask::DOWN);
|
|
}
|
|
input->joy_hat(i, joypad.dpad);
|
|
break;
|
|
|
|
default:
|
|
if (joypad_event.code >= MAX_ABS) {
|
|
return;
|
|
}
|
|
if (joypad.abs_map[joypad_event.code] != -1 && joypad.abs_info[joypad_event.code]) {
|
|
float value = axis_correct(joypad.abs_info[joypad_event.code], joypad_event.value);
|
|
joypad.curr_axis[joypad.abs_map[joypad_event.code]] = value;
|
|
}
|
|
break;
|
|
}
|
|
break;
|
|
}
|
|
}
|
|
joypad.events.clear();
|
|
|
|
for (int j = 0; j < MAX_ABS; j++) {
|
|
int index = joypad.abs_map[j];
|
|
if (index != -1) {
|
|
input->joy_axis(i, (JoyAxis)index, joypad.curr_axis[index]);
|
|
}
|
|
}
|
|
|
|
if (joypad.force_feedback) {
|
|
uint64_t timestamp = input->get_joy_vibration_timestamp(i);
|
|
if (timestamp > joypad.ff_effect_timestamp) {
|
|
Vector2 strength = input->get_joy_vibration_strength(i);
|
|
float duration = input->get_joy_vibration_duration(i);
|
|
if (strength.x == 0 && strength.y == 0) {
|
|
joypad_vibration_stop(joypad, timestamp);
|
|
} else {
|
|
joypad_vibration_start(joypad, strength.x, strength.y, duration, timestamp);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
#endif // JOYDEV_ENABLED
|