diff --git a/src/blitter/32bpp_anim.cpp b/src/blitter/32bpp_anim.cpp
index 80ec54da43..61c2758221 100644
--- a/src/blitter/32bpp_anim.cpp
+++ b/src/blitter/32bpp_anim.cpp
@@ -480,7 +480,7 @@ void Blitter_32bppAnim::PaletteAnimate(const Palette &palette)
 	}
 
 	/* Make sure the backend redraws the whole screen */
-	_video_driver->MakeDirty(0, 0, _screen.width, _screen.height);
+	VideoDriver::GetInstance()->MakeDirty(0, 0, _screen.width, _screen.height);
 }
 
 Blitter::PaletteAnimation Blitter_32bppAnim::UsePaletteAnimation()
diff --git a/src/bootstrap_gui.cpp b/src/bootstrap_gui.cpp
index c2b76f0b1c..5e2af004d1 100644
--- a/src/bootstrap_gui.cpp
+++ b/src/bootstrap_gui.cpp
@@ -244,7 +244,7 @@ bool HandleBootstrap()
 	new BootstrapAskForDownloadWindow();
 
 	/* Process the user events. */
-	_video_driver->MainLoop();
+	VideoDriver::GetInstance()->MainLoop();
 
 	/* _exit_game is used to get out of the video driver's main loop.
 	 * In case GM_BOOTSTRAP is still set we did not exit it via the
diff --git a/src/console_gui.cpp b/src/console_gui.cpp
index c3dcdaa122..ff3c509c95 100644
--- a/src/console_gui.cpp
+++ b/src/console_gui.cpp
@@ -185,7 +185,7 @@ struct IConsoleWindow : Window
 	~IConsoleWindow()
 	{
 		_iconsole_mode = ICONSOLE_CLOSED;
-		_video_driver->EditBoxLostFocus();
+		VideoDriver::GetInstance()->EditBoxLostFocus();
 	}
 
 	/**
@@ -374,7 +374,7 @@ struct IConsoleWindow : Window
 
 	virtual void OnFocusLost()
 	{
-		_video_driver->EditBoxLostFocus();
+		VideoDriver::GetInstance()->EditBoxLostFocus();
 	}
 };
 
diff --git a/src/crashlog.cpp b/src/crashlog.cpp
index 986736bb3e..7bb30e583b 100644
--- a/src/crashlog.cpp
+++ b/src/crashlog.cpp
@@ -138,14 +138,14 @@ char *CrashLog::LogConfiguration(char *buffer, const char *last) const
 			BaseGraphics::GetUsedSet() == NULL ? "none" : BaseGraphics::GetUsedSet()->name,
 			BaseGraphics::GetUsedSet() == NULL ? UINT32_MAX : BaseGraphics::GetUsedSet()->version,
 			_current_language == NULL ? "none" : _current_language->file,
-			_music_driver == NULL ? "none" : _music_driver->GetName(),
+			MusicDriver::GetInstance() == NULL ? "none" : MusicDriver::GetInstance()->GetName(),
 			BaseMusic::GetUsedSet() == NULL ? "none" : BaseMusic::GetUsedSet()->name,
 			BaseMusic::GetUsedSet() == NULL ? UINT32_MAX : BaseMusic::GetUsedSet()->version,
 			_networking ? (_network_server ? "server" : "client") : "no",
-			_sound_driver == NULL ? "none" : _sound_driver->GetName(),
+			SoundDriver::GetInstance() == NULL ? "none" : SoundDriver::GetInstance()->GetName(),
 			BaseSounds::GetUsedSet() == NULL ? "none" : BaseSounds::GetUsedSet()->name,
 			BaseSounds::GetUsedSet() == NULL ? UINT32_MAX : BaseSounds::GetUsedSet()->version,
-			_video_driver == NULL ? "none" : _video_driver->GetName()
+			VideoDriver::GetInstance() == NULL ? "none" : VideoDriver::GetInstance()->GetName()
 	);
 
 	buffer += seprintf(buffer, last,
@@ -482,7 +482,7 @@ bool CrashLog::MakeCrashLog() const
  */
 /* static */ void CrashLog::AfterCrashLogCleanup()
 {
-	if (_music_driver != NULL) _music_driver->Stop();
-	if (_sound_driver != NULL) _sound_driver->Stop();
-	if (_video_driver != NULL) _video_driver->Stop();
+	if (MusicDriver::GetInstance() != NULL) MusicDriver::GetInstance()->Stop();
+	if (SoundDriver::GetInstance() != NULL) SoundDriver::GetInstance()->Stop();
+	if (VideoDriver::GetInstance() != NULL) VideoDriver::GetInstance()->Stop();
 }
diff --git a/src/driver.cpp b/src/driver.cpp
index dd03e5e7b6..6ef0563f7d 100644
--- a/src/driver.cpp
+++ b/src/driver.cpp
@@ -16,17 +16,14 @@
 #include "video/video_driver.hpp"
 #include "string_func.h"
 
-VideoDriver *_video_driver; ///< The currently active video driver.
 char *_ini_videodriver;     ///< The video driver a stored in the configuration file.
 int _num_resolutions;       ///< The number of resolutions.
 Dimension _resolutions[32]; ///< List of resolutions.
 Dimension _cur_resolution;  ///< The current resolution.
 bool _rightclick_emulate;   ///< Whether right clicking is emulated.
 
-SoundDriver *_sound_driver; ///< The currently active sound driver.
 char *_ini_sounddriver;     ///< The sound driver a stored in the configuration file.
 
-MusicDriver *_music_driver; ///< The currently active music driver.
 char *_ini_musicdriver;     ///< The music driver a stored in the configuration file.
 
 char *_ini_blitter;         ///< The blitter as stored in the configuration file.
@@ -86,9 +83,25 @@ int GetDriverParamInt(const char * const *parm, const char *name, int def)
  * @param type the type of driver to select
  * @post Sets the driver so GetCurrentDriver() returns it too.
  */
-Driver *DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
+void DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
 {
-	if (GetDrivers().size() == 0) return NULL;
+	if (!DriverFactoryBase::SelectDriverImpl(name, type)) {
+		StrEmpty(name) ?
+			usererror("Failed to autoprobe %s driver", GetDriverTypeName(type)) :
+			usererror("Failed to select requested %s driver '%s'", GetDriverTypeName(type), name);
+	}
+}
+
+/**
+ * Find the requested driver and return its class.
+ * @param name the driver to select.
+ * @param type the type of driver to select
+ * @post Sets the driver so GetCurrentDriver() returns it too.
+ * @return True upon success, otherwise false.
+ */
+bool DriverFactoryBase::SelectDriverImpl(const char *name, Driver::Type type)
+{
+	if (GetDrivers().size() == 0) return false;
 
 	if (StrEmpty(name)) {
 		/* Probe for this driver, but do not fall back to dedicated/null! */
@@ -101,15 +114,18 @@ Driver *DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
 				if (d->type != type) continue;
 				if (d->priority != priority) continue;
 
+				Driver *oldd = *GetActiveDriver(type);
 				Driver *newd = d->CreateInstance();
+				*GetActiveDriver(type) = newd;
+
 				const char *err = newd->Start(NULL);
 				if (err == NULL) {
 					DEBUG(driver, 1, "Successfully probed %s driver '%s'", GetDriverTypeName(type), d->name);
-					delete *GetActiveDriver(type);
-					*GetActiveDriver(type) = newd;
-					return newd;
+					delete oldd;
+					return true;
 				}
 
+				*GetActiveDriver(type) = oldd;
 				DEBUG(driver, 1, "Probing %s driver '%s' failed with error: %s", GetDriverTypeName(type), d->name, err);
 				delete newd;
 			}
@@ -158,7 +174,7 @@ Driver *DriverFactoryBase::SelectDriver(const char *name, Driver::Type type)
 			DEBUG(driver, 1, "Successfully loaded %s driver '%s'", GetDriverTypeName(type), d->name);
 			delete *GetActiveDriver(type);
 			*GetActiveDriver(type) = newd;
-			return newd;
+			return true;
 		}
 		usererror("No such %s driver: %s\n", GetDriverTypeName(type), buffer);
 	}
diff --git a/src/driver.h b/src/driver.h
index a466d67d00..12ca4474d4 100644
--- a/src/driver.h
+++ b/src/driver.h
@@ -59,6 +59,10 @@ DECLARE_POSTFIX_INCREMENT(Driver::Type)
 /** Base for all driver factories. */
 class DriverFactoryBase {
 private:
+	friend class MusicDriver;
+	friend class SoundDriver;
+	friend class VideoDriver;
+
 	Driver::Type type;       ///< The type of driver.
 	int priority;            ///< The priority of this factory.
 	const char *name;        ///< The name of the drivers of this factory.
@@ -97,6 +101,8 @@ private:
 		return driver_type_name[type];
 	}
 
+	static bool SelectDriverImpl(const char *name, Driver::Type type);
+
 protected:
 	DriverFactoryBase(Driver::Type type, int priority, const char *name, const char *description);
 
@@ -114,7 +120,7 @@ public:
 		}
 	}
 
-	static Driver *SelectDriver(const char *name, Driver::Type type);
+	static void SelectDriver(const char *name, Driver::Type type);
 	static char *GetDriversInfo(char *p, const char *last);
 
 	/**
diff --git a/src/genworld.cpp b/src/genworld.cpp
index 822fe141fa..c2f4c518b5 100644
--- a/src/genworld.cpp
+++ b/src/genworld.cpp
@@ -98,7 +98,7 @@ static void _GenerateWorld(void *)
 	try {
 		_generating_world = true;
 		_modal_progress_work_mutex->BeginCritical();
-		if (_network_dedicated) DEBUG(net, 0, "Generating map, please wait...");
+		if (_network_dedicated) DEBUG(net, 1, "Generating map, please wait...");
 		/* Set the Random() seed to generation_seed so we produce the same map with the same seed */
 		if (_settings_game.game_creation.generation_seed == GENERATE_NEW_SEED) _settings_game.game_creation.generation_seed = _settings_newgame.game_creation.generation_seed = InteractiveRandom();
 		_random.SetSeed(_settings_game.game_creation.generation_seed);
@@ -195,7 +195,7 @@ static void _GenerateWorld(void *)
 
 		ShowNewGRFError();
 
-		if (_network_dedicated) DEBUG(net, 0, "Map generated, starting game");
+		if (_network_dedicated) DEBUG(net, 1, "Map generated, starting game");
 		DEBUG(desync, 1, "new_map: %08x", _settings_game.game_creation.generation_seed);
 
 		if (_debug_desync_level > 0) {
@@ -328,7 +328,7 @@ void GenerateWorld(GenWorldMode mode, uint size_x, uint size_y, bool reset_setti
 		_gw.thread = NULL;
 	}
 
-	if (!_video_driver->HasGUI() || !ThreadObject::New(&_GenerateWorld, NULL, &_gw.thread)) {
+	if (!VideoDriver::GetInstance()->HasGUI() || !ThreadObject::New(&_GenerateWorld, NULL, &_gw.thread)) {
 		DEBUG(misc, 1, "Cannot create genworld thread, reverting to single-threaded mode");
 		_gw.threaded = false;
 		_modal_progress_work_mutex->EndCritical();
diff --git a/src/gfx.cpp b/src/gfx.cpp
index adc644d205..9a034c1726 100644
--- a/src/gfx.cpp
+++ b/src/gfx.cpp
@@ -85,7 +85,7 @@ void GfxScroll(int left, int top, int width, int height, int xo, int yo)
 
 	blitter->ScrollBuffer(_screen.dst_ptr, left, top, width, height, xo, yo);
 	/* This part of the screen is now dirty. */
-	_video_driver->MakeDirty(left, top, width, height);
+	VideoDriver::GetInstance()->MakeDirty(left, top, width, height);
 }
 
 
@@ -1183,7 +1183,7 @@ void UndrawMouseCursor()
 		Blitter *blitter = BlitterFactory::GetCurrentBlitter();
 		_cursor.visible = false;
 		blitter->CopyFromBuffer(blitter->MoveTo(_screen.dst_ptr, _cursor.draw_pos.x, _cursor.draw_pos.y), _cursor_backup.GetBuffer(), _cursor.draw_size.x, _cursor.draw_size.y);
-		_video_driver->MakeDirty(_cursor.draw_pos.x, _cursor.draw_pos.y, _cursor.draw_size.x, _cursor.draw_size.y);
+		VideoDriver::GetInstance()->MakeDirty(_cursor.draw_pos.x, _cursor.draw_pos.y, _cursor.draw_size.x, _cursor.draw_size.y);
 	}
 }
 
@@ -1243,7 +1243,7 @@ void DrawMouseCursor()
 	_cur_dpi = &_screen;
 	DrawSprite(_cursor.sprite, _cursor.pal, _cursor.pos.x + _cursor.short_vehicle_offset, _cursor.pos.y);
 
-	_video_driver->MakeDirty(_cursor.draw_pos.x, _cursor.draw_pos.y, _cursor.draw_size.x, _cursor.draw_size.y);
+	VideoDriver::GetInstance()->MakeDirty(_cursor.draw_pos.x, _cursor.draw_pos.y, _cursor.draw_size.x, _cursor.draw_size.y);
 
 	_cursor.visible = true;
 	_cursor.dirty = false;
@@ -1267,7 +1267,7 @@ void RedrawScreenRect(int left, int top, int right, int bottom)
 
 	DrawOverlappedWindowForAll(left, top, right, bottom);
 
-	_video_driver->MakeDirty(left, top, right - left, bottom - top);
+	VideoDriver::GetInstance()->MakeDirty(left, top, right - left, bottom - top);
 }
 
 /**
@@ -1576,12 +1576,12 @@ void SetAnimatedMouseCursor(const AnimCursor *table)
 
 bool ChangeResInGame(int width, int height)
 {
-	return (_screen.width == width && _screen.height == height) || _video_driver->ChangeResolution(width, height);
+	return (_screen.width == width && _screen.height == height) || VideoDriver::GetInstance()->ChangeResolution(width, height);
 }
 
 bool ToggleFullScreen(bool fs)
 {
-	bool result = _video_driver->ToggleFullscreen(fs);
+	bool result = VideoDriver::GetInstance()->ToggleFullscreen(fs);
 	if (_fullscreen != fs && _num_resolutions == 0) {
 		DEBUG(driver, 0, "Could not find a suitable fullscreen resolution");
 	}
diff --git a/src/gfxinit.cpp b/src/gfxinit.cpp
index 109db2e08a..3151a76715 100644
--- a/src/gfxinit.cpp
+++ b/src/gfxinit.cpp
@@ -282,9 +282,9 @@ static bool SwitchNewGRFBlitter()
 		break;
 	}
 
-	if (!_video_driver->AfterBlitterChange()) {
+	if (!VideoDriver::GetInstance()->AfterBlitterChange()) {
 		/* Failed to switch blitter, let's hope we can return to the old one. */
-		if (BlitterFactory::SelectBlitter(cur_blitter) == NULL || !_video_driver->AfterBlitterChange()) usererror("Failed to reinitialize video driver. Specify a fixed blitter in the config");
+		if (BlitterFactory::SelectBlitter(cur_blitter) == NULL || !VideoDriver::GetInstance()->AfterBlitterChange()) usererror("Failed to reinitialize video driver. Specify a fixed blitter in the config");
 	}
 
 	return true;
diff --git a/src/music/extmidi.cpp b/src/music/extmidi.cpp
index 93492aa996..367b2e4645 100644
--- a/src/music/extmidi.cpp
+++ b/src/music/extmidi.cpp
@@ -35,8 +35,8 @@ static FMusicDriver_ExtMidi iFMusicDriver_ExtMidi;
 
 const char *MusicDriver_ExtMidi::Start(const char * const * parm)
 {
-	if (strcmp(_video_driver->GetName(), "allegro") == 0 ||
-			strcmp(_sound_driver->GetName(), "allegro") == 0) {
+	if (strcmp(VideoDriver::GetInstance()->GetName(), "allegro") == 0 ||
+			strcmp(SoundDriver::GetInstance()->GetName(), "allegro") == 0) {
 		return "the extmidi driver does not work when Allegro is loaded.";
 	}
 
diff --git a/src/music/music_driver.hpp b/src/music/music_driver.hpp
index 03c70d5691..be09d3ea2b 100644
--- a/src/music/music_driver.hpp
+++ b/src/music/music_driver.hpp
@@ -39,9 +39,15 @@ public:
 	 * @param vol The new volume.
 	 */
 	virtual void SetVolume(byte vol) = 0;
+
+	/**
+	 * Get the currently active instance of the music driver.
+	 */
+	static MusicDriver *GetInstance() {
+		return static_cast<MusicDriver*>(*DriverFactoryBase::GetActiveDriver(Driver::DT_MUSIC));
+	}
 };
 
-extern MusicDriver *_music_driver;
 extern char *_ini_musicdriver;
 
 #endif /* MUSIC_MUSIC_DRIVER_HPP */
diff --git a/src/music_gui.cpp b/src/music_gui.cpp
index 896624cb7d..1e20716512 100644
--- a/src/music_gui.cpp
+++ b/src/music_gui.cpp
@@ -174,7 +174,7 @@ static void SkipToNextSong()
 
 static void MusicVolumeChanged(byte new_vol)
 {
-	_music_driver->SetVolume(new_vol);
+	MusicDriver::GetInstance()->SetVolume(new_vol);
 }
 
 static void DoPlaySong()
@@ -183,13 +183,13 @@ static void DoPlaySong()
 	if (FioFindFullPath(filename, lengthof(filename), BASESET_DIR, BaseMusic::GetUsedSet()->files[_music_wnd_cursong - 1].filename) == NULL) {
 		FioFindFullPath(filename, lengthof(filename), OLD_GM_DIR, BaseMusic::GetUsedSet()->files[_music_wnd_cursong - 1].filename);
 	}
-	_music_driver->PlaySong(filename);
+	MusicDriver::GetInstance()->PlaySong(filename);
 	SetWindowDirty(WC_MUSIC_WINDOW, 0);
 }
 
 static void DoStopMusic()
 {
-	_music_driver->StopSong();
+	MusicDriver::GetInstance()->StopSong();
 	SetWindowDirty(WC_MUSIC_WINDOW, 0);
 }
 
@@ -271,7 +271,7 @@ void MusicLoop()
 
 	if (!_song_is_active) return;
 
-	if (!_music_driver->IsSongPlaying()) {
+	if (!MusicDriver::GetInstance()->IsSongPlaying()) {
 		if (_game_mode != GM_MENU) {
 			StopMusic();
 			SkipToNextSong();
diff --git a/src/network/network_chat_gui.cpp b/src/network/network_chat_gui.cpp
index 8b965feff2..d7d2d59a39 100644
--- a/src/network/network_chat_gui.cpp
+++ b/src/network/network_chat_gui.cpp
@@ -167,7 +167,7 @@ void NetworkUndrawChatMessage()
 		/* Put our 'shot' back to the screen */
 		blitter->CopyFromBuffer(blitter->MoveTo(_screen.dst_ptr, x, y), _chatmessage_backup, width, height);
 		/* And make sure it is updated next time */
-		_video_driver->MakeDirty(x, y, width, height);
+		VideoDriver::GetInstance()->MakeDirty(x, y, width, height);
 
 		_chatmessage_dirty = true;
 	}
@@ -254,7 +254,7 @@ void NetworkDrawChatMessage()
 	}
 
 	/* Make sure the data is updated next flush */
-	_video_driver->MakeDirty(x, y, width, height);
+	VideoDriver::GetInstance()->MakeDirty(x, y, width, height);
 
 	_chatmessage_visible = true;
 	_chatmessage_dirty = false;
diff --git a/src/newgrf_config.cpp b/src/newgrf_config.cpp
index 337b3edd11..d1ace81c15 100644
--- a/src/newgrf_config.cpp
+++ b/src/newgrf_config.cpp
@@ -773,7 +773,7 @@ void ScanNewGRFFiles(NewGRFScanCallback *callback)
 	/* Only then can we really start, especially by marking the whole screen dirty. Get those other windows hidden!. */
 	MarkWholeScreenDirty();
 
-	if (!_video_driver->HasGUI() || !ThreadObject::New(&DoScanNewGRFFiles, callback, NULL)) {
+	if (!VideoDriver::GetInstance()->HasGUI() || !ThreadObject::New(&DoScanNewGRFFiles, callback, NULL)) {
 		_modal_progress_work_mutex->EndCritical();
 		_modal_progress_paint_mutex->EndCritical();
 		DoScanNewGRFFiles(callback);
diff --git a/src/openttd.cpp b/src/openttd.cpp
index c901272c57..d4b47dda79 100644
--- a/src/openttd.cpp
+++ b/src/openttd.cpp
@@ -95,7 +95,7 @@ void CDECL usererror(const char *s, ...)
 	va_end(va);
 
 	ShowOSErrorBox(buf, false);
-	if (_video_driver != NULL) _video_driver->Stop();
+	if (VideoDriver::GetInstance() != NULL) VideoDriver::GetInstance()->Stop();
 
 	exit(1);
 }
@@ -341,7 +341,7 @@ static void LoadIntroGame(bool load_newgrfs = true)
 	CheckForMissingGlyphs();
 
 	/* Play main theme */
-	if (_music_driver->IsSongPlaying()) ResetMusic();
+	if (MusicDriver::GetInstance()->IsSongPlaying()) ResetMusic();
 }
 
 void MakeNewgameSettingsLive()
@@ -434,7 +434,7 @@ struct AfterNewGRFScan : NewGRFScanCallback {
 		*save_config_ptr = save_config;
 
 		/* restore saved music volume */
-		_music_driver->SetVolume(_settings_client.music.music_vol);
+		MusicDriver::GetInstance()->SetVolume(_settings_client.music.music_vol);
 
 		if (startyear != INVALID_YEAR) _settings_newgame.game_creation.starting_year = startyear;
 		if (generation_seed != GENERATE_NEW_SEED) _settings_newgame.game_creation.generation_seed = generation_seed;
@@ -766,12 +766,7 @@ int openttd_main(int argc, char *argv[])
 	free(blitter);
 
 	if (videodriver == NULL && _ini_videodriver != NULL) videodriver = strdup(_ini_videodriver);
-	_video_driver = (VideoDriver*)DriverFactoryBase::SelectDriver(videodriver, Driver::DT_VIDEO);
-	if (_video_driver == NULL) {
-		StrEmpty(videodriver) ?
-			usererror("Failed to autoprobe video driver") :
-			usererror("Failed to select requested video driver '%s'", videodriver);
-	}
+	DriverFactoryBase::SelectDriver(videodriver, Driver::DT_VIDEO);
 	free(videodriver);
 
 	InitializeSpriteSorter();
@@ -802,7 +797,7 @@ int openttd_main(int argc, char *argv[])
 		goto exit_bootstrap;
 	}
 
-	_video_driver->ClaimMousePointer();
+	VideoDriver::GetInstance()->ClaimMousePointer();
 
 	/* initialize screenshot formats */
 	InitializeScreenshotFormats();
@@ -834,21 +829,11 @@ int openttd_main(int argc, char *argv[])
 	free(music_set);
 
 	if (sounddriver == NULL && _ini_sounddriver != NULL) sounddriver = strdup(_ini_sounddriver);
-	_sound_driver = (SoundDriver*)DriverFactoryBase::SelectDriver(sounddriver, Driver::DT_SOUND);
-	if (_sound_driver == NULL) {
-		StrEmpty(sounddriver) ?
-			usererror("Failed to autoprobe sound driver") :
-			usererror("Failed to select requested sound driver '%s'", sounddriver);
-	}
+	DriverFactoryBase::SelectDriver(sounddriver, Driver::DT_SOUND);
 	free(sounddriver);
 
 	if (musicdriver == NULL && _ini_musicdriver != NULL) musicdriver = strdup(_ini_musicdriver);
-	_music_driver = (MusicDriver*)DriverFactoryBase::SelectDriver(musicdriver, Driver::DT_MUSIC);
-	if (_music_driver == NULL) {
-		StrEmpty(musicdriver) ?
-			usererror("Failed to autoprobe music driver") :
-			usererror("Failed to select requested music driver '%s'", musicdriver);
-	}
+	DriverFactoryBase::SelectDriver(musicdriver, Driver::DT_MUSIC);
 	free(musicdriver);
 
 	/* Take our initial lock on whatever we might want to do! */
@@ -866,7 +851,7 @@ int openttd_main(int argc, char *argv[])
 	ScanNewGRFFiles(scanner);
 	scanner = NULL;
 
-	_video_driver->MainLoop();
+	VideoDriver::GetInstance()->MainLoop();
 
 	WaitTillSaved();
 
@@ -934,7 +919,7 @@ static void MakeNewGameDone()
 	SettingsDisableElrail(_settings_game.vehicle.disable_elrails);
 
 	/* In a dedicated server, the server does not play */
-	if (!_video_driver->HasGUI()) {
+	if (!VideoDriver::GetInstance()->HasGUI()) {
 		SetLocalCompany(COMPANY_SPECTATOR);
 		if (_settings_client.gui.pause_on_newgame) DoCommandP(0, PM_PAUSED_NORMAL, 1, CMD_PAUSE);
 		IConsoleCmdExec("exec scripts/game_start.scr 0");
@@ -1500,6 +1485,6 @@ void GameLoop()
 
 	InputLoop();
 
-	_sound_driver->MainLoop();
+	SoundDriver::GetInstance()->MainLoop();
 	MusicLoop();
 }
diff --git a/src/os/unix/unix.cpp b/src/os/unix/unix.cpp
index 09bf6c6e70..c9c98ea9f4 100644
--- a/src/os/unix/unix.cpp
+++ b/src/os/unix/unix.cpp
@@ -337,9 +337,18 @@ uint GetCPUCoreCount()
 	int ncpu = 0;
 	size_t len = sizeof(ncpu);
 
+#ifdef OPENBSD
+	int name[2];
+	name[0] = CTL_HW;
+	name[1] = HW_NCPU;
+	if (sysctl(name, 2, &ncpu, &len, NULL, 0) < 0) {
+	        ncpu = 0;
+	}
+#else
 	if (sysctlbyname("hw.availcpu", &ncpu, &len, NULL, 0) < 0) {
 		sysctlbyname("hw.ncpu", &ncpu, &len, NULL, 0);
 	}
+#endif /* #ifdef OPENBSD */
 
 	if (ncpu > 0) count = ncpu;
 #elif defined(_SC_NPROCESSORS_ONLN)
diff --git a/src/os/windows/crashlog_win.cpp b/src/os/windows/crashlog_win.cpp
index 41f83b60ba..2a44aeb1d7 100644
--- a/src/os/windows/crashlog_win.cpp
+++ b/src/os/windows/crashlog_win.cpp
@@ -521,7 +521,7 @@ static LONG WINAPI ExceptionHandler(EXCEPTION_POINTERS *ep)
 	/* Close any possible log files */
 	CloseConsoleLogIfActive();
 
-	if ((_video_driver == NULL || _video_driver->HasGUI()) && _safe_esp != NULL) {
+	if ((VideoDriver::GetInstance() == NULL || VideoDriver::GetInstance()->HasGUI()) && _safe_esp != NULL) {
 #ifdef _M_AMD64
 		ep->ContextRecord->Rip = (DWORD64)ShowCrashlogWindow;
 		ep->ContextRecord->Rsp = (DWORD64)_safe_esp;
diff --git a/src/osk_gui.cpp b/src/osk_gui.cpp
index 2516c4dbf6..7ed5554634 100644
--- a/src/osk_gui.cpp
+++ b/src/osk_gui.cpp
@@ -206,7 +206,7 @@ struct OskWindow : public Window {
 
 	virtual void OnFocusLost()
 	{
-		_video_driver->EditBoxLostFocus();
+		VideoDriver::GetInstance()->EditBoxLostFocus();
 		delete this;
 	}
 };
diff --git a/src/sound/sound_driver.hpp b/src/sound/sound_driver.hpp
index 2b9cf145d0..0df69b8b45 100644
--- a/src/sound/sound_driver.hpp
+++ b/src/sound/sound_driver.hpp
@@ -19,9 +19,15 @@ class SoundDriver : public Driver {
 public:
 	/** Called once every tick */
 	virtual void MainLoop() {}
+
+	/**
+	 * Get the currently active instance of the sound driver.
+	 */
+	static SoundDriver *GetInstance() {
+		return static_cast<SoundDriver*>(*DriverFactoryBase::GetActiveDriver(Driver::DT_SOUND));
+	}
 };
 
-extern SoundDriver *_sound_driver;
 extern char *_ini_sounddriver;
 
 #endif /* SOUND_SOUND_DRIVER_HPP */
diff --git a/src/strgen/strgen.cpp b/src/strgen/strgen.cpp
index c407f23454..01692d47e9 100644
--- a/src/strgen/strgen.cpp
+++ b/src/strgen/strgen.cpp
@@ -122,7 +122,7 @@ struct FileStringReader : StringReader {
 
 	/* virtual */ char *ReadLine(char *buffer, size_t size)
 	{
-		return fgets(buffer, size, this->fh);
+		return fgets(buffer, ClampToU16(size), this->fh);
 	}
 
 	/* virtual */ void HandlePragma(char *str);
diff --git a/src/video/cocoa/cocoa_v.mm b/src/video/cocoa/cocoa_v.mm
index 4a95d1901b..ed9d3a91fa 100644
--- a/src/video/cocoa/cocoa_v.mm
+++ b/src/video/cocoa/cocoa_v.mm
@@ -597,16 +597,16 @@ void CocoaDialog(const char *title, const char *message, const char *buttonLabel
 	_cocoa_video_dialog = true;
 
 	bool wasstarted = _cocoa_video_started;
-	if (_video_driver == NULL) {
+	if (VideoDriver::GetInstance() == NULL) {
 		setupApplication(); // Setup application before showing dialog
-	} else if (!_cocoa_video_started && _video_driver->Start(NULL) != NULL) {
+	} else if (!_cocoa_video_started && VideoDriver::GetInstance()->Start(NULL) != NULL) {
 		fprintf(stderr, "%s: %s\n", title, message);
 		return;
 	}
 
 	NSRunAlertPanel([ NSString stringWithUTF8String:title ], [ NSString stringWithUTF8String:message ], [ NSString stringWithUTF8String:buttonLabel ], nil, nil);
 
-	if (!wasstarted && _video_driver != NULL) _video_driver->Stop();
+	if (!wasstarted && VideoDriver::GetInstance() != NULL) VideoDriver::GetInstance()->Stop();
 
 	_cocoa_video_dialog = false;
 }
diff --git a/src/video/cocoa/event.mm b/src/video/cocoa/event.mm
index b4f171a98a..78785f8d0c 100644
--- a/src/video/cocoa/event.mm
+++ b/src/video/cocoa/event.mm
@@ -287,7 +287,7 @@ static bool QZ_KeyEvent(unsigned short keycode, unsigned short unicode, BOOL dow
 		case QZ_RETURN:
 		case QZ_f:
 			if (down && (_current_mods & NSCommandKeyMask)) {
-				_video_driver->ToggleFullscreen(!_fullscreen);
+				VideoDriver::GetInstance()->ToggleFullscreen(!_fullscreen);
 			}
 			break;
 	}
diff --git a/src/video/sdl_v.cpp b/src/video/sdl_v.cpp
index cad21955d0..c9935e8a36 100644
--- a/src/video/sdl_v.cpp
+++ b/src/video/sdl_v.cpp
@@ -409,7 +409,7 @@ bool VideoDriver_SDL::CreateMainSurface(uint w, uint h)
 			break;
 
 		case Blitter::PALETTE_ANIMATION_BLITTER:
-			if (_video_driver != NULL) blitter->PaletteAnimate(_local_palette);
+			if (VideoDriver::GetInstance() != NULL) blitter->PaletteAnimate(_local_palette);
 			break;
 
 		default:
diff --git a/src/video/video_driver.hpp b/src/video/video_driver.hpp
index 190bfcc10f..916044d358 100644
--- a/src/video/video_driver.hpp
+++ b/src/video/video_driver.hpp
@@ -78,9 +78,15 @@ public:
 	 * An edit box lost the input focus. Abort character compositing if necessary.
 	 */
 	virtual void EditBoxLostFocus() {}
+
+	/**
+	 * Get the currently active instance of the video driver.
+	 */
+	static VideoDriver *GetInstance() {
+		return static_cast<VideoDriver*>(*DriverFactoryBase::GetActiveDriver(Driver::DT_VIDEO));
+	}
 };
 
-extern VideoDriver *_video_driver;
 extern char *_ini_videodriver;
 extern int _num_resolutions;
 extern Dimension _resolutions[32];
diff --git a/src/video/win32_v.cpp b/src/video/win32_v.cpp
index c0da6db54e..fc1a3a064a 100644
--- a/src/video/win32_v.cpp
+++ b/src/video/win32_v.cpp
@@ -1003,7 +1003,7 @@ static LRESULT CALLBACK WndProcGdi(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lP
 				if (active && minimized) {
 					/* Restore the game window */
 					ShowWindow(hwnd, SW_RESTORE);
-					static_cast<VideoDriver_Win32 *>(_video_driver)->MakeWindow(true);
+					static_cast<VideoDriver_Win32 *>(VideoDriver::GetInstance())->MakeWindow(true);
 				} else if (!active && !minimized) {
 					/* Minimise the window and restore desktop */
 					ShowWindow(hwnd, SW_MINIMIZE);
diff --git a/src/window.cpp b/src/window.cpp
index 8f97693f60..d39bc494e9 100644
--- a/src/window.cpp
+++ b/src/window.cpp
@@ -446,7 +446,7 @@ bool EditBoxInGlobalFocus()
 void Window::UnfocusFocusedWidget()
 {
 	if (this->nested_focus != NULL) {
-		if (this->nested_focus->type == WWT_EDITBOX) _video_driver->EditBoxLostFocus();
+		if (this->nested_focus->type == WWT_EDITBOX) VideoDriver::GetInstance()->EditBoxLostFocus();
 
 		/* Repaint the widget that lost focus. A focused edit box may else leave the caret on the screen. */
 		this->nested_focus->SetDirty(this);
@@ -470,7 +470,7 @@ bool Window::SetFocusedWidget(int widget_index)
 
 		/* Repaint the widget that lost focus. A focused edit box may else leave the caret on the screen. */
 		this->nested_focus->SetDirty(this);
-		if (this->nested_focus->type == WWT_EDITBOX) _video_driver->EditBoxLostFocus();
+		if (this->nested_focus->type == WWT_EDITBOX) VideoDriver::GetInstance()->EditBoxLostFocus();
 	}
 	this->nested_focus = this->GetWidget<NWidgetCore>(widget_index);
 	return true;
@@ -481,7 +481,7 @@ bool Window::SetFocusedWidget(int widget_index)
  */
 void Window::OnFocusLost()
 {
-	if (this->nested_focus != NULL && this->nested_focus->type == WWT_EDITBOX) _video_driver->EditBoxLostFocus();
+	if (this->nested_focus != NULL && this->nested_focus->type == WWT_EDITBOX) VideoDriver::GetInstance()->EditBoxLostFocus();
 }
 
 /**