Add support for Unicode input messages on Windows

src/input.cpp

@@ -197,6 +197,14 @@ void print(PNV_KEYBOARD_PACKET packet) {
     << "--end keyboard packet--"sv;
 }
 
+void print(PNV_UNICODE_PACKET packet) {
+  std::string text(packet->text, util::endian::big(packet->header.size) - sizeof(packet->header.magic));
+  BOOST_LOG(debug)
+    << "--begin unicode packet--"sv << std::endl
+    << "text ["sv << text << ']' << std::endl
+    << "--end unicode packet--"sv;
+}
+
 void print(PNV_MULTI_CONTROLLER_PACKET packet) {
   // Moonlight spams controller packet even when not necessary
   BOOST_LOG(verbose)
@@ -234,6 +242,9 @@ void print(void *payload) {
   case KEY_UP_EVENT_MAGIC:
     print((PNV_KEYBOARD_PACKET)payload);
     break;
+  case UTF8_TEXT_EVENT_MAGIC:
+    print((PNV_UNICODE_PACKET)payload);
+    break;
   case MULTI_CONTROLLER_MAGIC_GEN5:
     print((PNV_MULTI_CONTROLLER_PACKET)payload);
     break;
@@ -448,6 +459,11 @@ void passthrough(PNV_SCROLL_PACKET packet) {
   platf::scroll(platf_input, util::endian::big(packet->scrollAmt1));
 }
 
+void passthrough(PNV_UNICODE_PACKET packet) {
+  auto size = util::endian::big(packet->header.size) - sizeof(packet->header.magic);
+  platf::unicode(platf_input, packet->text, size);
+}
+
 int updateGamepads(std::vector<gamepad_t> &gamepads, std::int16_t old_state, std::int16_t new_state, const platf::rumble_queue_t &rumble_queue) {
   auto xorGamepadMask = old_state ^ new_state;
   if(!xorGamepadMask) {
@@ -609,6 +625,9 @@ void passthrough_helper(std::shared_ptr<input_t> input, std::vector<std::uint8_t
   case KEY_UP_EVENT_MAGIC:
     passthrough(input, (PNV_KEYBOARD_PACKET)payload);
     break;
+  case UTF8_TEXT_EVENT_MAGIC:
+    passthrough((PNV_UNICODE_PACKET)payload);
+    break;
   case MULTI_CONTROLLER_MAGIC_GEN5:
     passthrough(input, (PNV_MULTI_CONTROLLER_PACKET)payload);
     break;

src/platform/common.h

@@ -296,6 +296,7 @@ void button_mouse(input_t &input, int button, bool release);
 void scroll(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);
 
 int alloc_gamepad(input_t &input, int nr, rumble_queue_t rumble_queue);
 void free_gamepad(input_t &input, int nr);

src/platform/linux/input.cpp

@@ -994,6 +994,10 @@ void keyboard(input_t &input, uint16_t modcode, bool release) {
   keycode.pressed = 1;
 }
 
+void unicode(input_t &input, char *utf8, int size) {
+  BOOST_LOG(info) << "unicode: Unicode input not yet implemented for Linux."sv;
+}
+
 int alloc_gamepad(input_t &input, int nr, rumble_queue_t rumble_queue) {
   return ((input_raw_t *)input.get())->alloc_gamepad(nr, std::move(rumble_queue));
 }

src/platform/macos/input.cpp

@@ -277,6 +277,10 @@ void keyboard(input_t &input, uint16_t modcode, bool release) {
   CGEventPost(kCGHIDEventTap, event);
 }
 
+void unicode(input_t &input, char *utf8, int size) {
+  BOOST_LOG(info) << "unicode: Unicode input not yet implemented for MacOS."sv;
+}
+
 int alloc_gamepad(input_t &input, int nr, rumble_queue_t rumble_queue) {
   BOOST_LOG(info) << "alloc_gamepad: Gamepad not yet implemented for MacOS."sv;
   return -1;

src/platform/windows/input.cpp

@@ -326,6 +326,34 @@ void keyboard(input_t &input, uint16_t modcode, bool release) {
   send_input(i);
 }
 
+void unicode(input_t &input, char *utf8, int size) {
+  // We can do no worse than one UTF-16 character per byte of UTF-8
+  WCHAR wide[size];
+
+  int chars = MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, utf8, size, wide, size);
+  if(chars <= 0) {
+    return;
+  }
+
+  // Send all key down events
+  for(int i = 0; i < chars; i++) {
+    INPUT input {};
+    input.type       = INPUT_KEYBOARD;
+    input.ki.wScan   = wide[i];
+    input.ki.dwFlags = KEYEVENTF_UNICODE;
+    send_input(input);
+  }
+
+  // Send all key up events
+  for(int i = 0; i < chars; i++) {
+    INPUT input {};
+    input.type       = INPUT_KEYBOARD;
+    input.ki.wScan   = wide[i];
+    input.ki.dwFlags = KEYEVENTF_UNICODE | KEYEVENTF_KEYUP;
+    send_input(input);
+  }
+}
+
 int alloc_gamepad(input_t &input, int nr, rumble_queue_t rumble_queue) {
   if(!input) {
     return 0;