libevdev mouse support

src/qt/evdev_mouse.cpp

@@ -0,0 +1,102 @@
+#include "evdev_mouse.hpp"
+#include <libevdev/libevdev.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+#include <vector>
+#include <atomic>
+#include <string>
+#include <tuple>
+
+#include <QThread>
+
+extern "C"
+{
+#include <86box/86box.h>
+#include <86box/plat.h>
+#include <86box/mouse.h>
+}
+
+static std::vector<std::pair<int, libevdev*>> evdev_mice;
+static std::atomic<bool> stopped = false;
+static QThread* evdev_thread;
+
+static std::atomic<int> evdev_mouse_rel_x = 0, evdev_mouse_rel_y = 0;
+
+void evdev_mouse_poll()
+{
+    if (!evdev_mice.size() || !mouse_capture)
+    {
+        evdev_mouse_rel_x = 0;
+        evdev_mouse_rel_y = 0;
+        return;
+    }
+    mouse_x = evdev_mouse_rel_x;
+    mouse_y = evdev_mouse_rel_y;
+    evdev_mouse_rel_x = evdev_mouse_rel_y = 0;
+}
+
+void evdev_thread_func()
+{
+    while (!stopped)
+    {
+        for (int i = 0; i < evdev_mice.size(); i++)
+        {
+            struct input_event ev;
+            int rc = libevdev_next_event(evdev_mice[i].second, LIBEVDEV_READ_FLAG_NORMAL, &ev);
+            if (rc == 0 && ev.type == EV_REL && mouse_capture)
+            {
+                if (ev.code == REL_X) evdev_mouse_rel_x += ev.value;
+                if (ev.code == REL_Y) evdev_mouse_rel_y += ev.value;
+            }
+        }
+    }
+    for (int i = 0; i < evdev_mice.size(); i++)
+    {
+        libevdev_free(evdev_mice[i].second);
+        close(evdev_mice[i].first);
+    }
+    evdev_mice.clear();
+}
+
+void evdev_stop()
+{
+    stopped = true;
+    evdev_thread->wait();
+}
+
+void evdev_init()
+{
+    for (int i = 0; i < 256; i++)
+    {
+        std::string evdev_device_path = "/dev/input/event" + std::to_string(i);
+        int fd = open(evdev_device_path.c_str(), O_NONBLOCK | O_RDONLY);
+        if (fd != -1)
+        {
+            libevdev* input_struct = nullptr;
+            int rc = libevdev_new_from_fd(fd, &input_struct);
+            if (rc <= -1)
+            {
+                close(fd);
+                continue;
+            }
+            else
+            {
+                if (!libevdev_has_event_type(input_struct, EV_REL) || !libevdev_has_event_code(input_struct, EV_KEY, BTN_LEFT))
+                {
+                    libevdev_free(input_struct);
+                    close(fd);
+                    continue;
+                }
+                evdev_mice.push_back(std::make_pair(fd, input_struct));
+            }
+        }
+        else if (errno == ENOENT) break;
+    }
+    if (evdev_mice.size() != 0)
+    {
+        evdev_thread = QThread::create(evdev_thread_func);
+        evdev_thread->start();
+        atexit(evdev_stop);
+    }
+}