Added on state loaded callback function to core so that driver code can be notified of a new state being loaded. In Qt driver, emit a signal on state loads that objects can connect to. For a resync of all netplay clients when server detects a new state load.

src/drivers/Qt/ConsoleWindow.cpp

@@ -274,6 +274,17 @@ consoleWin_t::consoleWin_t(QWidget *parent)
 	aviDiskThread = new AviRecordDiskThread_t(this);
 
 	scrHandlerConnected = false;
+
+	// Register State Load Callback with Emulation Core
+	auto stateLoadCallback = []( bool loadSuccess )
+	{
+		//printf("State Loaded: %i \n", loadSuccess );
+		if (loadSuccess && (consoleWindow != nullptr) )
+		{
+			emit consoleWindow->stateLoaded();
+		}
+	};
+	FCEUSS_SetLoadCallback( stateLoadCallback );
 }
 
 consoleWin_t::~consoleWin_t(void)

src/drivers/Qt/ConsoleWindow.h

@@ -328,6 +328,7 @@ class  consoleWin_t : public QMainWindow
 	public:
 	signals:
 		void romLoaded(void);
+		void stateLoaded(void);
 		void nesResetOccurred(void);
 
 	public slots:

src/drivers/Qt/NetPlay.cpp

@@ -176,6 +176,7 @@ NetPlayServer::NetPlayServer(QObject *parent)
 	connect(this, SIGNAL(newConnection(void)), this, SLOT(newConnectionRdy(void)));
 
 	connect(consoleWindow, SIGNAL(romLoaded(void)), this, SLOT(onRomLoad(void)));
+	connect(consoleWindow, SIGNAL(stateLoaded(void)), this, SLOT(onStateLoad(void)));
 	connect(consoleWindow, SIGNAL(nesResetOccurred(void)), this, SLOT(onNesReset(void)));
 
 	FCEU_WRAPPER_LOCK();
@@ -454,9 +455,26 @@ void NetPlayServer::onRomLoad()
 	FCEU_WRAPPER_UNLOCK();
 }
 //-----------------------------------------------------------------------------
+void NetPlayServer::onStateLoad()
+{
+	//printf("New State Loaded!\n");
+	FCEU_WRAPPER_LOCK();
+
+	inputClear();
+	inputFrameCount = static_cast<uint32_t>(currFrameCounter);
+
+	// New State has been loaded by server, signal clients to load and sync
+	for (auto& client : clientList )
+	{
+		//sendRomLoadReq( client );
+		sendStateSyncReq( client );
+	}
+	FCEU_WRAPPER_UNLOCK();
+}
+//-----------------------------------------------------------------------------
 void NetPlayServer::onNesReset()
 {
-	//printf("New ROM Loaded!\n");
+	//printf("NES Reset Event!\n");
 	FCEU_WRAPPER_LOCK();
 
 	inputClear();

src/drivers/Qt/NetPlay.h

@@ -175,6 +175,7 @@ class NetPlayServer : public QTcpServer
 	public slots:
 		void newConnectionRdy(void);
 		void onRomLoad(void);
+		void onStateLoad(void);
 		void onNesReset(void);
 };
 

src/state.cpp

@@ -63,6 +63,7 @@ using namespace std;
 
 static void (*SPreSave)(void) = NULL;
 static void (*SPostSave)(void) = NULL;
+static void (*SPostLoad)(bool) = NULL;
 
 static int SaveStateStatus[10];
 static int StateShow;
@@ -640,8 +641,8 @@ int FCEUSS_LoadFP_old(EMUFILE* is, ENUM_SSLOADPARAMS params)
 }
 
 #ifdef __QT_DRIVER__
-// Qt Driver NetPlay state load handler. This is to control state loading,
+// Qt Driver NetPlay state load handler. This is to control state loading
-// only hosts can load states and clients can request loads.
+// during netplay, only hosts can load states and clients can request loads.
 bool NetPlayStateLoadReq(EMUFILE* is);
 #endif
 
@@ -730,9 +731,18 @@ bool FCEUSS_LoadFP(EMUFILE* is, ENUM_SSLOADPARAMS params)
 		FCEUSS_LoadFP(&msBackupSavestate,SSLOADPARAM_NOBACKUP);
 	}
 
+	// Post state load callback that is used to notify driver code that a new state load occurred.
+	if (SPostLoad != NULL)
+	{
+		SPostLoad(x);
+	}
 	return x;
 }
 
+void FCEUSS_SetLoadCallback( void (*cb)(bool) )
+{
+	SPostLoad = cb;
+}
 
 bool FCEUSS_Load(const char *fname, bool display_message)
 {

src/state.h

@@ -28,6 +28,7 @@ enum ENUM_SSLOADPARAMS
 
 void FCEUSS_Save(const char *, bool display_message=true);
 bool FCEUSS_Load(const char *, bool display_message=true);
+void FCEUSS_SetLoadCallback( void (*cb)(bool) );
 
  //zlib values: 0 (none) through 9 (max) or -1 (default)
 bool FCEUSS_SaveMS(EMUFILE* outstream, int compressionLevel);