Fix joystick support for Qt build

CMakeLists.txt

@@ -682,6 +682,16 @@ elseif(USING_QT_UI)
     include_directories(${CMAKE_CURRENT_BINARY_DIR} Qt Qt/Debugger)
 	set(nativeExtraLibs ${nativeExtraLibs} Qt5::Multimedia Qt5::OpenGL Qt5::Gui Qt5::Core)
 	set(TargetBin PPSSPPQt)
+
+    # Enable SDL if found
+    if (SDL2_FOUND)
+        add_definitions(-DSDL)
+        set(nativeExtra ${nativeExtra}
+            SDL/SDLJoystick.h
+            SDL/SDLJoystick.cpp)
+        set(nativeExtraLibs ${nativeExtraLibs} SDL2::SDL2)
+    endif()
+
 elseif(TARGET SDL2::SDL2)
 	set(TargetBin PPSSPPSDL)
 	# Require SDL

SDL/SDLJoystick.cpp

@@ -7,15 +7,13 @@
 
 using namespace std;
 
-extern "C" {
-	int SDLJoystickThreadWrapper(void *SDLJoy){
-		SDLJoystick *stick = static_cast<SDLJoystick *>(SDLJoy);
-		stick->runLoop();
-		return 0;
-	}
+static int SDLJoystickEventHandlerWrapper(void* userdata, SDL_Event* event)
+{
+	static_cast<SDLJoystick *>(userdata)->ProcessInput(*event);
+	return 0;
 }
 
-SDLJoystick::SDLJoystick(bool init_SDL ): thread(NULL), running(true) {
+SDLJoystick::SDLJoystick(bool init_SDL ) : registeredAsEventHandler(false) {
 	if (init_SDL) {
 		SDL_SetHint(SDL_HINT_JOYSTICK_ALLOW_BACKGROUND_EVENTS, "1");
 		SDL_Init(SDL_INIT_JOYSTICK | SDL_INIT_VIDEO | SDL_INIT_GAMECONTROLLER);
@@ -81,20 +79,17 @@ void SDLJoystick::setUpController(int deviceIndex) {
 }
 
 SDLJoystick::~SDLJoystick() {
-	if (thread) {
-		running = false;
-		SDL_Event evt;
-		evt.type = SDL_USEREVENT;
-		SDL_PushEvent(&evt);
-		SDL_WaitThread(thread,0);
+	if (registeredAsEventHandler) {
+		SDL_DelEventWatch(SDLJoystickEventHandlerWrapper, this);
 	}
 	for (auto & controller : controllers) {
 		SDL_GameControllerClose(controller);
 	}
 }
 
-void SDLJoystick::startEventLoop() {
-	thread = SDL_CreateThread(SDLJoystickThreadWrapper, "joystick",static_cast<void *>(this));
+void SDLJoystick::registerEventHandler() {
+	SDL_AddEventWatch(SDLJoystickEventHandlerWrapper, this);
+	registeredAsEventHandler = true;
 }
 
 keycode_t SDLJoystick::getKeycodeForButton(SDL_GameControllerButton button) {
@@ -199,13 +194,3 @@ int SDLJoystick::getDeviceIndex(int instanceId) {
 	}
 	return it->second;
 }
-
-void SDLJoystick::runLoop() {
-	while (running) {
-		SDL_Event evt;
-		int res = SDL_WaitEvent(&evt);
-		if (res) {
-			ProcessInput(evt);
-		}
-	}
-}

SDL/SDLJoystick.h

@@ -12,28 +12,20 @@
 #include "net/resolve.h"
 #include "base/NativeApp.h"
 
-extern "C" {
-	int SDLJoystickThreadWrapper(void *SDLJoy);
-}
-
 class SDLJoystick{
-	friend int ::SDLJoystickThreadWrapper(void *);
 public:
 	SDLJoystick(bool init_SDL = false);
 	~SDLJoystick();
 
-	void startEventLoop();
+	void registerEventHandler();
 	void ProcessInput(SDL_Event &event);
 
 private:
-
-	void runLoop();
 	void setUpController(int deviceIndex);
 	void setUpControllers();
 	keycode_t getKeycodeForButton(SDL_GameControllerButton button);
 	int getDeviceIndex(int instanceId);
-	SDL_Thread *thread ;
-	bool running ;
+	bool registeredAsEventHandler;
 	std::vector<SDL_GameController *> controllers;
 	std::map<int, int> controllerDeviceMap;
 };

ext/native/base/QtMain.cpp

@@ -139,7 +139,7 @@ static int mainInternal(QApplication &a)
 
 #ifdef SDL
 	SDLJoystick joy(true);
-	joy.startEventLoop();
+	joy.registerEventHandler();
 	SDL_Init(SDL_INIT_AUDIO);
 	SDL_AudioSpec fmt, ret_fmt;
 	memset(&fmt, 0, sizeof(fmt));
@@ -334,6 +334,9 @@ void MainUI::initializeGL()
 
 void MainUI::paintGL()
 {
+#ifdef SDL
+    SDL_PumpEvents();
+#endif
     updateAccelerometer();
     UpdateInputState(&input_state);
     time_update();