For Qt GUI fixed region auto detection logic to preserve dendy mode if an NTSC game is loaded. Also, added an option to enable/disable region auto detection functionality. This allows for the users selection via the GUI to be strictly enforced. Also, added a region select sub menu to the emulation main menu. Fixes issue #335.

src/driver.h

@@ -125,6 +125,7 @@ void FCEUI_SetVidSystem(int a);
 //Set variables for NTSC(0) / PAL(1) / Dendy(2)
 //Dendy has PAL framerate and resolution, but ~NTSC timings, and has 50 dummy scanlines to force 50 fps
 void FCEUI_SetRegion(int region, int notify = 1);
+int  FCEUI_GetRegion(void);
 
 //Convenience function; returns currently emulated video system(0=NTSC, 1=PAL).
 int FCEUI_GetCurrentVidSystem(int *slstart, int *slend);

src/drivers/Qt/ConsoleVideoConf.cpp

@@ -140,6 +140,9 @@ ConsoleVideoConfDialog_t::ConsoleVideoConfDialog_t(QWidget *parent)
 
 	vbox1->addLayout( hbox1 );
 
+	// Enable Region Auto Detection Logic
+	autoRegion  = new QCheckBox( tr("Region Auto Detect") );
+
 	// Enable New PPU Checkbox
 	new_PPU_ena  = new QCheckBox( tr("Enable New PPU") );
 
@@ -161,6 +164,7 @@ ConsoleVideoConfDialog_t::ConsoleVideoConfDialog_t(QWidget *parent)
 	// Square Pixels
 	sqrPixCbx  = new QCheckBox( tr("Square Pixels") );
 
+	setCheckBoxFromProperty( autoRegion   , "SDL.AutoDetectPAL");
 	setCheckBoxFromProperty( new_PPU_ena  , "SDL.NewPPU");
 	setCheckBoxFromProperty( frmskipcbx   , "SDL.Frameskip");
 	setCheckBoxFromProperty( sprtLimCbx   , "SDL.DisableSpriteLimit");
@@ -181,6 +185,7 @@ ConsoleVideoConfDialog_t::ConsoleVideoConfDialog_t(QWidget *parent)
 		}
 	}
 
+	connect(autoRegion  , SIGNAL(stateChanged(int)), this, SLOT(autoRegionChanged(int)) );
 	connect(new_PPU_ena , SIGNAL(stateChanged(int)), this, SLOT(use_new_PPU_changed(int)) );
 	connect(frmskipcbx  , SIGNAL(stateChanged(int)), this, SLOT(frameskip_changed(int)) );
 	connect(sprtLimCbx  , SIGNAL(stateChanged(int)), this, SLOT(useSpriteLimitChanged(int)) );
@@ -189,6 +194,7 @@ ConsoleVideoConfDialog_t::ConsoleVideoConfDialog_t(QWidget *parent)
 	connect(sqrPixCbx   , SIGNAL(stateChanged(int)), this, SLOT(sqrPixChanged(int)) );
 	connect(autoScaleCbx, SIGNAL(stateChanged(int)), this, SLOT(autoScaleChanged(int)) );
 
+	vbox1->addWidget( autoRegion  );
 	vbox1->addWidget( new_PPU_ena );
 	vbox1->addWidget( frmskipcbx  );
 	vbox1->addWidget( sprtLimCbx  );
@@ -387,6 +393,18 @@ void ConsoleVideoConfDialog_t::closeEvent(QCloseEvent *event)
 //----------------------------------------------------------------------------
 void ConsoleVideoConfDialog_t::periodicUpdate(void)
 {
+	int actRegion, selRegion;
+       
+	// Keep region menu selection sync'd to actual state
+	actRegion = FCEUI_GetRegion();
+	selRegion = regionSelect->currentIndex(); 
+
+	if ( actRegion != selRegion )
+	{
+		regionSelect->setCurrentIndex(actRegion); 
+	}
+
+	// Update Window Size Readouts
 	updateReadouts();
 }
 //----------------------------------------------------------------------------
@@ -577,6 +595,13 @@ void ConsoleVideoConfDialog_t::autoScaleChanged( int value )
    }
 }
 
+//----------------------------------------------------
+void ConsoleVideoConfDialog_t::autoRegionChanged( int value )
+{
+	//printf("Value:%i \n", value );
+	g_config->setOption("SDL.AutoDetectPAL", (value == Qt::Checked) );
+	g_config->save ();
+}
 //----------------------------------------------------
 void ConsoleVideoConfDialog_t::use_new_PPU_changed( int value )
 {
@@ -682,18 +707,21 @@ void ConsoleVideoConfDialog_t::scalerChanged(int index)
 void ConsoleVideoConfDialog_t::regionChanged(int index)
 {
 	int region;
+	int actRegion = FCEUI_GetRegion();
 	//printf("Region: %i : %i \n", index, regionSelect->itemData(index).toInt() );
 
 	region = regionSelect->itemData(index).toInt();
 
 	g_config->setOption ("SDL.PAL", region);
-
 	g_config->save ();
 
 	// reset sound subsystem for changes to take effect
-	fceuWrapperLock();
+	if ( actRegion != region )
-	FCEUI_SetRegion (region, true);
+	{
-	fceuWrapperUnLock();
+		fceuWrapperLock();
+		FCEUI_SetRegion (region, true);
+		fceuWrapperUnLock();
+	}
 }
 //----------------------------------------------------
 QSize ConsoleVideoConfDialog_t::calcNewScreenSize(void)

src/drivers/Qt/ConsoleVideoConf.h

@@ -33,6 +33,7 @@ class ConsoleVideoConfDialog_t : public QDialog
 		QComboBox   *driverSelect;
 		QComboBox   *scalerSelect;
 		QComboBox   *regionSelect;
+		QCheckBox   *autoRegion;
 		QCheckBox   *gl_LF_chkBox;
 		QCheckBox   *new_PPU_ena;
 		QCheckBox   *frmskipcbx;
@@ -65,6 +66,7 @@ class ConsoleVideoConfDialog_t : public QDialog
 
 	private slots:
 		void  periodicUpdate(void);
+		void  autoRegionChanged( int value );
 		void  openGL_linearFilterChanged( int value );
 		void  autoScaleChanged( int value );
 		void  sqrPixChanged( int value );

src/drivers/Qt/ConsoleWindow.cpp

@@ -183,6 +183,7 @@ consoleWin_t::consoleWin_t(QWidget *parent)
 		this->showFullScreen();
 	}
 
+	updateCounter = 0;
 	recentRomMenuReset = false;
 }
 
@@ -679,6 +680,43 @@ void consoleWin_t::createMainMenu(void)
 	
 	emuMenu->addSeparator();
 
+	// Emulation -> Region
+	subMenu = emuMenu->addMenu(tr("&Region"));
+	group   = new QActionGroup(this);
+
+	group->setExclusive(true);
+
+	for (int i=0; i<3; i++)
+	{
+		const char *txt;
+
+		if ( i == 1 )
+		{
+			txt = "&PAL";
+		}
+		else if ( i == 2 )
+		{
+			txt = "&Dendy";
+		}
+		else
+		{
+			txt = "&NTSC";
+		}
+
+	        region[i] = new QAction(tr(txt), this);
+	        region[i]->setCheckable(true);
+
+	        group->addAction(region[i]);
+		subMenu->addAction(region[i]);
+	}
+	region[ FCEUI_GetRegion() ]->setChecked(true);
+
+	connect( region[0], SIGNAL(triggered(void)), this, SLOT(setRegionNTSC(void)) );
+	connect( region[1], SIGNAL(triggered(void)), this, SLOT(setRegionPAL(void)) );
+	connect( region[2], SIGNAL(triggered(void)), this, SLOT(setRegionDendy(void)) );
+
+	emuMenu->addSeparator();
+
 	// Emulation -> Enable Game Genie
 	gameGenieAct = new QAction(tr("Enable Game &Genie"), this);
 	//gameGenieAct->setShortcut( QKeySequence(tr("Ctrl+G")));
@@ -1953,6 +1991,42 @@ void consoleWin_t::consolePause(void)
    return;
 }
 
+void consoleWin_t::setRegion(int region)
+{
+	int currentRegion;
+
+	g_config->setOption ("SDL.PAL", region);
+	g_config->save ();
+
+	currentRegion = FCEUI_GetRegion();
+
+	if ( currentRegion != region )
+	{
+		fceuWrapperLock();
+		FCEUI_SetRegion (region, true);
+		fceuWrapperUnLock();
+	}
+	return;
+}
+
+void consoleWin_t::setRegionNTSC(void)
+{
+	setRegion(0);
+	return;
+}
+
+void consoleWin_t::setRegionPAL(void)
+{
+	setRegion(1);
+	return;
+}
+
+void consoleWin_t::setRegionDendy(void)
+{
+	setRegion(2);
+	return;
+}
+
 void consoleWin_t::toggleGameGenie(bool checked)
 {
 	int gg_enabled;
@@ -2567,6 +2641,18 @@ void consoleWin_t::updatePeriodic(void)
 		}
 	}
 
+	// Low Rate Updates
+	if ( (updateCounter % 20) == 0 )
+	{
+		// Keep region menu selection sync'd to actual state
+		int actRegion = FCEUI_GetRegion();
+
+		if ( !region[ actRegion ]->isChecked() )
+		{
+			region[ actRegion ]->setChecked(true);
+		}
+	}
+
 	if ( errorMsgValid )
 	{
 		showErrorMsgWindow();
@@ -2587,6 +2673,8 @@ void consoleWin_t::updatePeriodic(void)
 		closeRequested = false;
 	}
 
+	updateCounter++;
+
    return;
 }
 

src/drivers/Qt/ConsoleWindow.h

@@ -180,6 +180,7 @@ class  consoleWin_t : public QMainWindow
 		QAction *stopMovAct;
 		QAction *recMovAct;
 		QAction *recAsMovAct;
+		QAction *region[3];
 
 		QTimer  *gameTimer;
 
@@ -190,6 +191,7 @@ class  consoleWin_t : public QMainWindow
 
 		std::list <std::string*> romList;
 
+		unsigned int updateCounter;
 	protected:
 		void closeEvent(QCloseEvent *event);
 		void keyPressEvent(QKeyEvent *event);
@@ -202,6 +204,7 @@ class  consoleWin_t : public QMainWindow
 		void buildRecentRomMenu(void);
 		void saveRecentRomMenu(void);
 		void clearRomList(void);
+		void setRegion(int region);
 
 	public slots:
 		void openDebugWindow(void);
@@ -254,6 +257,9 @@ class  consoleWin_t : public QMainWindow
 		void consolePause(void);
 		void toggleGameGenie(bool checked);
 		void loadGameGenieROM(void);
+		void setRegionNTSC(void);
+		void setRegionPAL(void);
+		void setRegionDendy(void);
 		void insertCoin(void);
 		void fdsSwitchDisk(void);
 		void fdsEjectDisk(void);

src/drivers/Qt/config.cpp

@@ -229,6 +229,7 @@ InitConfig()
     
 	config->addOption('g', "gamegenie", "SDL.GameGenie", 0);
 	config->addOption("pal", "SDL.PAL", 0);
+	config->addOption("autoPal", "SDL.AutoDetectPAL", 1);
 	config->addOption("frameskip", "SDL.Frameskip", 0);
 	config->addOption("clipsides", "SDL.ClipSides", 0);
 	config->addOption("nospritelim", "SDL.DisableSpriteLimit", 1);

src/drivers/Qt/fceuWrapper.cpp

@@ -313,10 +313,43 @@ int LoadGame(const char *path, bool silent)
 	}
 	
 	// set pal/ntsc
-	int id;
+	int id, region, autoDetectPAL;
-	id = FCEUI_GetCurrentVidSystem(NULL, NULL);
+	g_config->getOption("SDL.PAL", &region);
-	g_config->setOption("SDL.PAL", id);
+	g_config->getOption("SDL.AutoDetectPAL", &autoDetectPAL);
-	FCEUI_SetRegion(id);
+
+	if ( autoDetectPAL )
+	{
+		id = FCEUI_GetCurrentVidSystem(NULL, NULL);
+
+		if ( region == 2 )
+		{	// Dendy mode:
+			//   Run PAL Games as PAL
+			//   Run NTSC Games as Dendy
+			if ( id == 1 )
+			{
+				g_config->setOption("SDL.PAL", id);
+				FCEUI_SetRegion(id);
+			}
+			else
+			{
+				FCEUI_SetRegion(region);
+			}
+		}
+		else
+		{	// Run NTSC games as NTSC and PAL games as PAL
+			g_config->setOption("SDL.PAL", id);
+			FCEUI_SetRegion(id);
+		}
+	}
+	else
+	{
+		// If not Auto-detection of region,
+		// Strictly enforce region GUI selection
+		// Does not matter what type of game is 
+		// loaded, the current region selection is used 
+		FCEUI_SetRegion(region);
+	}
+
 
 	g_config->getOption("SDL.SwapDuty", &id);
 	swapDuty = id;

src/fceu.cpp

@@ -1073,7 +1073,27 @@ int FCEUI_GetCurrentVidSystem(int *slstart, int *slend) {
 	return(PAL);
 }
 
-void FCEUI_SetRegion(int region, int notify) {
+int  FCEUI_GetRegion(void)
+{
+	int region;
+
+	if ( pal_emulation )
+	{
+		region = 1;
+	}
+	else if ( dendy )
+	{
+		region = 2;
+	}
+	else
+	{
+		region = 0;
+	}
+	return region;
+}
+
+void FCEUI_SetRegion(int region, int notify) 
+{
 	switch (region) {
 		case 0: // NTSC
 			normalscanlines = 240;