Implement horizontal scrolling and Sunshine detection for Moonlight (#793)

src/platform/common.h

@@ -363,6 +363,7 @@ void move_mouse(input_t &input, int deltaX, int deltaY);
 void abs_mouse(input_t &input, const touch_port_t &touch_port, float x, float y);
 void button_mouse(input_t &input, int button, bool release);
 void scroll(input_t &input, int distance);
+void hscroll(input_t &input, int distance);
 void keyboard(input_t &input, uint16_t modcode, bool release);
 void gamepad(input_t &input, int nr, const gamepad_state_t &gamepad_state);
 void unicode(input_t &input, char *utf8, int size);

src/platform/linux/input.cpp

@@ -982,6 +982,19 @@ void scroll(input_t &input, int high_res_distance) {
   libevdev_uinput_write_event(mouse, EV_SYN, SYN_REPORT, 0);
 }
 
+void hscroll(input_t &input, int high_res_distance) {
+  int distance = high_res_distance / 120;
+
+  auto mouse = ((input_raw_t *)input.get())->mouse_input.get();
+  if(!mouse) {
+    return;
+  }
+
+  libevdev_uinput_write_event(mouse, EV_REL, REL_HWHEEL, distance);
+  libevdev_uinput_write_event(mouse, EV_REL, REL_HWHEEL_HI_RES, high_res_distance);
+  libevdev_uinput_write_event(mouse, EV_SYN, SYN_REPORT, 0);
+}
+
 static keycode_t keysym(std::uint16_t modcode) {
   if(modcode <= keycodes.size()) {
     return keycodes[modcode];

src/platform/macos/input.cpp

@@ -417,6 +417,10 @@ void scroll(input_t &input, int high_res_distance) {
   CFRelease(upEvent);
 }
 
+void hscroll(input_t &input, int high_res_distance) {
+  // Unimplemented
+}
+
 input_t input() {
   input_t result { new macos_input_t() };
 

src/platform/windows/input.cpp

@@ -303,6 +303,18 @@ void scroll(input_t &input, int distance) {
   send_input(i);
 }
 
+void hscroll(input_t &input, int distance) {
+  INPUT i {};
+
+  i.type   = INPUT_MOUSE;
+  auto &mi = i.mi;
+
+  mi.dwFlags   = MOUSEEVENTF_HWHEEL;
+  mi.mouseData = distance;
+
+  send_input(i);
+}
+
 void keyboard(input_t &input, uint16_t modcode, bool release) {
   auto raw = (input_raw_t *)input.get();