SWITCH: add nintendo switch support

14 files changed, 825 insertions, 9 deletions

diff --git a/.gitignore b/.gitignore
index 2708700d6a..49ca3b7819 100644
--- a/.gitignore
+++ b/.gitignore
@@ -248,6 +248,12 @@ psp2pkg/
 *.velf
 *.vpk
 
+#Ignore Switch files
+switch_release/
+scummvm.elf
+scummvm.nro
+scummvm_switch.zip
+
 #Ignore gmon.out created by gprof
 gmon.out
 /scummvm_libs_2015
diff --git a/backends/events/switchsdl/switchsdl-events.cpp b/backends/events/switchsdl/switchsdl-events.cpp
new file mode 100644
index 0000000000..64c2b42dfd
--- /dev/null
+++ b/backends/events/switchsdl/switchsdl-events.cpp
@@ -0,0 +1,432 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include "common/scummsys.h"
+
+#if defined(NINTENDO_SWITCH)
+
+#include <math.h>
+
+#include "backends/platform/sdl/switch/switch.h"
+#include "backends/events/switchsdl/switchsdl-events.h"
+#include "backends/timer/sdl/sdl-timer.h"
+#include "backends/platform/sdl/sdl.h"
+#include "engines/engine.h"
+
+#include "common/util.h"
+#include "common/events.h"
+#include "common/config-manager.h"
+
+SwitchEventSource::SwitchEventSource() {
+	for (int port = 0; port < SCE_TOUCH_PORT_MAX_NUM; port++) {
+		for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+			_finger[port][i].id = -1;
+		}
+		_multiFingerDragging[port] = DRAG_NONE;
+	}
+
+	for (int port = 0; port < SCE_TOUCH_PORT_MAX_NUM; port++) {
+		for (int i = 0; i < 2; i++) {
+			_simulatedClickStartTime[port][i] = 0;
+		}
+	}
+}
+
+bool SwitchEventSource::pollEvent(Common::Event &event) {
+	((DefaultTimerManager *) g_system->getTimerManager())->handler();
+	finishSimulatedMouseClicks();
+	return SdlEventSource::pollEvent(event);
+}
+
+void SwitchEventSource::preprocessEvents(SDL_Event *event) {
+
+	// Supported touch gestures:
+	// left mouse click: single finger short tap
+	// right mouse click: second finger short tap while first finger is still down
+	// pointer motion: single finger drag
+	if (event->type == SDL_FINGERDOWN || event->type == SDL_FINGERUP || event->type == SDL_FINGERMOTION) {
+		// front (0) or back (1) panel
+		SDL_TouchID port = event->tfinger.touchId;
+		//debug(0, "touch: %li\n", port);
+		if (port < SCE_TOUCH_PORT_MAX_NUM && port >= 0) {
+			// touchpad_mouse_mode off: use only front panel for direct touch control of pointer
+			// touchpad_mouse_mode on: also enable rear touch with indirect touch control
+			// where the finger can be somewhere else than the pointer and still move it
+			if (port == 0 || ConfMan.getBool("touchpad_mouse_mode")) {
+				switch (event->type) {
+				case SDL_FINGERDOWN:
+					//debug(0, "down[%li]: %i %i", event->tfinger.fingerId, (int) event->tfinger.x, (int) event->tfinger.y);
+					preprocessFingerDown(event);
+					break;
+				case SDL_FINGERUP:
+					//debug(0, "up[%li]: %i %i", event->tfinger.fingerId, (int) event->tfinger.x, (int) event->tfinger.y);
+					preprocessFingerUp(event);
+					break;
+				case SDL_FINGERMOTION:
+					//debug(0, "mov[%li]: %i %i", event->tfinger.fingerId, (int) event->tfinger.x, (int) event->tfinger.y);
+					preprocessFingerMotion(event);
+					break;
+				}
+			}
+		}
+	}
+}
+
+void SwitchEventSource::preprocessFingerDown(SDL_Event *event) {
+	// front (0) or back (1) panel
+	SDL_TouchID port = event->tfinger.touchId;
+	// id (for multitouch)
+	SDL_FingerID id = event->tfinger.fingerId;
+
+	int x = _km.x / MULTIPLIER;
+	int y = _km.y / MULTIPLIER;
+
+	if (port == 0 && !ConfMan.getBool("touchpad_mouse_mode")) {
+		convertTouchXYToGameXY(event->tfinger.x, event->tfinger.y, &x, &y);
+	}
+
+	// make sure each finger is not reported down multiple times
+	for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+		if (_finger[port][i].id == id) {
+			_finger[port][i].id = -1;
+		}
+	}
+
+	// we need the timestamps to decide later if the user performed a short tap (click)
+	// or a long tap (drag)
+	// we also need the last coordinates for each finger to keep track of dragging
+	for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+		if (_finger[port][i].id == -1) {
+			_finger[port][i].id = id;
+			_finger[port][i].timeLastDown = event->tfinger.timestamp;
+			_finger[port][i].lastDownX = event->tfinger.x;
+			_finger[port][i].lastDownY = event->tfinger.y;
+			_finger[port][i].lastX = x;
+			_finger[port][i].lastY = y;
+			break;
+		}
+	}
+}
+
+void SwitchEventSource::preprocessFingerUp(SDL_Event *event) {
+	// front (0) or back (1) panel
+	SDL_TouchID port = event->tfinger.touchId;
+	// id (for multitouch)
+	SDL_FingerID id = event->tfinger.fingerId;
+
+	// find out how many fingers were down before this event
+	int numFingersDown = 0;
+	for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+		if (_finger[port][i].id >= 0) {
+			numFingersDown++;
+		}
+	}
+
+	int x = _km.x / MULTIPLIER;
+	int y = _km.y / MULTIPLIER;
+
+	for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+		if (_finger[port][i].id == id) {
+			_finger[port][i].id = -1;
+			if (!_multiFingerDragging[port]) {
+				if ((event->tfinger.timestamp - _finger[port][i].timeLastDown) <= MAX_TAP_TIME) {
+					// short (<MAX_TAP_TIME ms) tap is interpreted as right/left mouse click depending on # fingers already down
+					// but only if the finger hasn't moved since it was pressed down by more than MAX_TAP_MOTION_DISTANCE pixels
+					float xrel = ((event->tfinger.x * (float) TOUCHSCREEN_WIDTH) - (_finger[port][i].lastDownX * (float) TOUCHSCREEN_WIDTH));
+					float yrel = ((event->tfinger.y * (float) TOUCHSCREEN_HEIGHT) - (_finger[port][i].lastDownY * (float) TOUCHSCREEN_HEIGHT));
+					float maxRSquared = (float) (MAX_TAP_MOTION_DISTANCE * MAX_TAP_MOTION_DISTANCE);
+					if ((xrel * xrel + yrel * yrel) < maxRSquared) {
+						if (numFingersDown == 2 || numFingersDown == 1) {
+							uint8 simulatedButton = 0;
+							if (numFingersDown == 2) {
+								simulatedButton = SDL_BUTTON_RIGHT;
+								// need to raise the button later
+								_simulatedClickStartTime[port][1] = event->tfinger.timestamp;
+							} else if (numFingersDown == 1) {
+								simulatedButton = SDL_BUTTON_LEFT;
+								// need to raise the button later
+								_simulatedClickStartTime[port][0] = event->tfinger.timestamp;
+								if (port == 0 && !ConfMan.getBool("touchpad_mouse_mode")) {
+									convertTouchXYToGameXY(event->tfinger.x, event->tfinger.y, &x, &y);
+								}
+							}
+
+							event->type = SDL_MOUSEBUTTONDOWN;
+							event->button.button = simulatedButton;
+							event->button.x = x;
+							event->button.y = y;
+						}
+					}
+				}
+			} else if (numFingersDown == 1) {
+				// when dragging, and the last finger is lifted, the drag is over
+				if (port == 0 && !ConfMan.getBool("touchpad_mouse_mode")) {
+					convertTouchXYToGameXY(event->tfinger.x, event->tfinger.y, &x, &y);
+				}
+				uint8 simulatedButton = 0;
+				if (_multiFingerDragging[port] == DRAG_THREE_FINGER)
+					simulatedButton = SDL_BUTTON_RIGHT;
+				else {
+					simulatedButton = SDL_BUTTON_LEFT;
+				}
+				event->type = SDL_MOUSEBUTTONUP;
+				event->button.button = simulatedButton;
+				event->button.x = x;
+				event->button.y = y;
+				_multiFingerDragging[port] = DRAG_NONE;
+			}
+		}
+	}
+}
+
+void SwitchEventSource::preprocessFingerMotion(SDL_Event *event) {
+	// front (0) or back (1) panel
+	SDL_TouchID port = event->tfinger.touchId;
+	// id (for multitouch)
+	SDL_FingerID id = event->tfinger.fingerId;
+
+	// find out how many fingers were down before this event
+	int numFingersDown = 0;
+	for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+		if (_finger[port][i].id >= 0) {
+			numFingersDown++;
+		}
+	}
+
+	if (numFingersDown >= 1) {
+		int x = _km.x / MULTIPLIER;
+		int y = _km.y / MULTIPLIER;
+
+		if (port == 0 && !ConfMan.getBool("touchpad_mouse_mode")) {
+			convertTouchXYToGameXY(event->tfinger.x, event->tfinger.y, &x, &y);
+		} else {
+			// for relative mode, use the pointer speed setting
+			float speedFactor = 1.0;
+
+			switch (ConfMan.getInt("kbdmouse_speed")) {
+			case 0:
+				speedFactor = 0.25;
+				break;
+			case 1:
+				speedFactor = 0.5;
+				break;
+			case 2:
+				speedFactor = 0.75;
+				break;
+			case 3:
+				speedFactor = 1.0;
+				break;
+			case 4:
+				speedFactor = 1.25;
+				break;
+			case 5:
+				speedFactor = 1.5;
+				break;
+			case 6:
+				speedFactor = 1.75;
+				break;
+			case 7:
+				speedFactor = 2.0;
+				break;
+			default:
+				speedFactor = 1.0;
+			}
+
+			// convert touch events to relative mouse pointer events
+			// Whenever an SDL_event involving the mouse is processed,
+			// _km.x/y are truncated from subpixel precision to regular pixel precision.
+			// Therefore, there's no need here to deal with subpixel precision in _km.x/y.
+			x = (_km.x / MULTIPLIER + (event->tfinger.dx * 1.25 * speedFactor * _km.x_max));
+			y = (_km.y / MULTIPLIER + (event->tfinger.dy * 1.25 * speedFactor * _km.y_max));
+		}
+
+		x = CLIP(x, 0, (int)_km.x_max);
+		y = CLIP(y, 0, (int)_km.y_max);
+
+		// update the current finger's coordinates so we can track it later
+		for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+			if (_finger[port][i].id == id) {
+				_finger[port][i].lastX = x;
+				_finger[port][i].lastY = y;
+			}
+		}
+
+		// If we are starting a multi-finger drag, start holding down the mouse button
+		if (numFingersDown >= 2) {
+			if (!_multiFingerDragging[port]) {
+				// only start a multi-finger drag if at least two fingers have been down long enough
+				int numFingersDownLong = 0;
+				for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+					if (_finger[port][i].id >= 0) {
+						if (event->tfinger.timestamp - _finger[port][i].timeLastDown > MAX_TAP_TIME) {
+							numFingersDownLong++;
+						}
+					}
+				}
+				if (numFingersDownLong >= 2) {
+					// starting drag, so push mouse down at current location (back) 
+					// or location of "oldest" finger (front)
+					int mouseDownX = _km.x / MULTIPLIER;
+					int mouseDownY = _km.y / MULTIPLIER;
+					if (port == 0 && !ConfMan.getBool("touchpad_mouse_mode")) {
+						for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+							if (_finger[port][i].id == id) {
+								uint32 earliestTime = _finger[port][i].timeLastDown;
+								for (int j = 0; j < MAX_NUM_FINGERS; j++) {
+									if (_finger[port][j].id >= 0 && (i != j) ) {
+										if (_finger[port][j].timeLastDown < earliestTime) {
+											mouseDownX = _finger[port][j].lastX;
+											mouseDownY = _finger[port][j].lastY;
+											earliestTime = _finger[port][j].timeLastDown;
+										}
+									}
+								}
+								break;
+							}
+						}
+					}
+					uint8 simulatedButton = 0;
+					if (numFingersDownLong == 2) {
+						simulatedButton = SDL_BUTTON_LEFT;
+						_multiFingerDragging[port] = DRAG_TWO_FINGER;
+					} else {
+						simulatedButton = SDL_BUTTON_RIGHT;
+						_multiFingerDragging[port] = DRAG_THREE_FINGER;
+					}
+					SDL_Event ev;
+					ev.type = SDL_MOUSEBUTTONDOWN;
+					ev.button.button = simulatedButton;
+					ev.button.x = mouseDownX;
+					ev.button.y = mouseDownY;
+					SDL_PushEvent(&ev);
+				}
+			}
+		}
+
+		//check if this is the "oldest" finger down (or the only finger down), otherwise it will not affect mouse motion
+		bool updatePointer = true;
+		if (numFingersDown > 1) {
+			for (int i = 0; i < MAX_NUM_FINGERS; i++) {
+				if (_finger[port][i].id == id) {
+					for (int j = 0; j < MAX_NUM_FINGERS; j++) {
+						if (_finger[port][j].id >= 0 && (i != j) ) {
+							if (_finger[port][j].timeLastDown < _finger[port][i].timeLastDown) {
+								updatePointer = false;
+							}
+						}
+					}
+				}
+			}
+		}
+		if (updatePointer) {
+			event->type = SDL_MOUSEMOTION;
+			event->motion.x = x;
+			event->motion.y = y;
+		}
+	}
+}
+
+void SwitchEventSource::convertTouchXYToGameXY(float touchX, float touchY, int *gameX, int *gameY) {
+	int screenH = _km.y_max;
+	int screenW = _km.x_max;
+
+	int windowH = g_system->getHeight();
+	//int windowW = g_system->getWidth();
+
+	bool fullscreen = ConfMan.getBool("fullscreen");
+	bool aspectRatioCorrection = ConfMan.getBool("aspect_ratio");
+
+	const int dispW = TOUCHSCREEN_WIDTH;
+	const int dispH = TOUCHSCREEN_HEIGHT;
+
+	int x, y, w, h;
+	float sx, sy;
+	float ratio = (float)screenW / (float)screenH;
+
+	if (aspectRatioCorrection && (windowH == 200 || windowH == 400)) {
+		ratio = 4.0f / 3.0f;
+	}
+
+	if (fullscreen || screenH >= dispH) {
+		h = dispH;
+		if (aspectRatioCorrection && (windowH == 200 || windowH == 400)) {
+			ratio = ratio * 1.1f;
+		}
+		w = h * ratio;
+	} else {
+		if (screenH <= dispH / 2 && screenW <= dispW / 2) {
+			h = screenH * 2;
+			w = screenW * 2;
+		} else {
+			h = screenH;
+			w = screenW;
+		}
+		if (aspectRatioCorrection && (windowH == 200 || windowH == 400)) {
+			// stretch the height only if it fits, otherwise make the width smaller
+			if (((float)w * (1.0f / ratio)) <= (float)dispH) {
+				h = w * (1.0f / ratio);
+			} else {
+				w = h * ratio;
+			}
+		}
+	}
+
+	x = (dispW - w) / 2;
+	y = (dispH - h) / 2;
+
+	sy = (float)h / (float)screenH;
+	sx = (float)w / (float)screenW;
+
+	// Find touch coordinates in terms of screen pixels
+	float dispTouchX = (touchX * (float)dispW);
+	float dispTouchY = (touchY * (float)dispH);
+
+	*gameX = CLIP((int)((dispTouchX - x) / sx), 0, (int)_km.x_max);
+	*gameY = CLIP((int)((dispTouchY - y) / sy), 0, (int)_km.y_max);
+}
+
+void SwitchEventSource::finishSimulatedMouseClicks() {
+	for (int port = 0; port < SCE_TOUCH_PORT_MAX_NUM; port++) {
+		for (int i = 0; i < 2; i++) {
+			if (_simulatedClickStartTime[port][i] != 0) {
+				uint32 currentTime = SDL_GetTicks();
+				if (currentTime - _simulatedClickStartTime[port][i] >= SIMULATED_CLICK_DURATION) {
+					int simulatedButton;
+					if (i == 0) {
+						simulatedButton = SDL_BUTTON_LEFT;
+					} else {
+						simulatedButton = SDL_BUTTON_RIGHT;
+					}
+					SDL_Event ev;
+					ev.type = SDL_MOUSEBUTTONUP;
+					ev.button.button = simulatedButton;
+					ev.button.x = _km.x / MULTIPLIER;
+					ev.button.y = _km.y / MULTIPLIER;
+					SDL_PushEvent(&ev);
+
+					_simulatedClickStartTime[port][i] = 0;
+				}
+			}
+		}
+	}
+}
+#endif
diff --git a/backends/events/switchsdl/switchsdl-events.h b/backends/events/switchsdl/switchsdl-events.h
new file mode 100644
index 0000000000..6a5076bac3
--- /dev/null
+++ b/backends/events/switchsdl/switchsdl-events.h
@@ -0,0 +1,78 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#if !defined(DISABLE_DEFAULT_EVENTMANAGER)
+#define BACKEND_EVENTS_SWITCH_H
+
+#include "backends/events/sdl/sdl-events.h"
+
+#define SCE_TOUCH_PORT_MAX_NUM 1
+#define TOUCHSCREEN_WIDTH 1280
+#define TOUCHSCREEN_HEIGHT 720
+
+/**
+ * SDL Events manager for the SWITCH.
+ */
+class SwitchEventSource : public SdlEventSource {
+public:
+	SwitchEventSource();
+	bool pollEvent(Common::Event &event) override;
+protected:
+	void preprocessEvents(SDL_Event *event) override;
+private:
+
+	enum {
+		MAX_NUM_FINGERS = 3, // number of fingers to track per panel
+		MAX_TAP_TIME = 250, // taps longer than this will not result in mouse click events
+		MAX_TAP_MOTION_DISTANCE = 10, // max distance finger motion in Vita screen pixels to be considered a tap
+		SIMULATED_CLICK_DURATION = 50, // time in ms how long simulated mouse clicks should be
+	}; // track three fingers per panel
+
+	typedef struct {
+		int id; // -1: no touch
+		uint32 timeLastDown;
+		int lastX; // last known screen coordinates
+		int lastY; // last known screen coordinates
+		float lastDownX; // SDL touch coordinates when last pressed down
+		float lastDownY; // SDL touch coordinates when last pressed down
+	} Touch;
+
+	Touch _finger[SCE_TOUCH_PORT_MAX_NUM][MAX_NUM_FINGERS]; // keep track of finger status
+
+	typedef enum DraggingType {
+		DRAG_NONE = 0,
+		DRAG_TWO_FINGER,
+		DRAG_THREE_FINGER,
+	} DraggingType;
+
+	DraggingType _multiFingerDragging[SCE_TOUCH_PORT_MAX_NUM]; // keep track whether we are currently drag-and-dropping
+
+	unsigned int _simulatedClickStartTime[SCE_TOUCH_PORT_MAX_NUM][2]; // initiation time of last simulated left or right click (zero if no click)
+
+	void preprocessFingerDown(SDL_Event *event);
+	void preprocessFingerUp(SDL_Event *event);
+	void preprocessFingerMotion(SDL_Event *event);
+	void convertTouchXYToGameXY(float touchX, float touchY, int *gameX, int *gameY);
+	void finishSimulatedMouseClicks(void);
+};
+
+#endif /* BACKEND_EVENTS_SWITCH_H */
diff --git a/backends/mixer/sdl/sdl-mixer.cpp b/backends/mixer/sdl/sdl-mixer.cpp
index 11a45ebcb2..0af0748a2a 100644
--- a/backends/mixer/sdl/sdl-mixer.cpp
+++ b/backends/mixer/sdl/sdl-mixer.cpp
@@ -32,7 +32,7 @@
 
 #if defined(GP2X)
 #define SAMPLES_PER_SEC 11025
-#elif defined(PLAYSTATION3) || defined(PSP2)
+#elif defined(PLAYSTATION3) || defined(PSP2) || defined(NINTENDO_SWITCH)
 #define SAMPLES_PER_SEC 48000
 #else
 #define SAMPLES_PER_SEC 44100
diff --git a/backends/module.mk b/backends/module.mk
index f19b9ed6e7..e85e9d1901 100644
--- a/backends/module.mk
+++ b/backends/module.mk
@@ -341,6 +341,11 @@ MODULE_OBJS += \
 	plugins/wii/wii-provider.o
 endif
 
+ifeq ($(BACKEND),switch)
+MODULE_OBJS += \
+	events/switchsdl/switchsdl-events.o
+endif
+
 ifdef ENABLE_EVENTRECORDER
 MODULE_OBJS += \
 	mixer/nullmixer/nullsdl-mixer.o \
diff --git a/backends/platform/sdl/module.mk b/backends/platform/sdl/module.mk
index e9533ab711..62ef94f19a 100644
--- a/backends/platform/sdl/module.mk
+++ b/backends/platform/sdl/module.mk
@@ -52,6 +52,12 @@ MODULE_OBJS += \
 	psp2/psp2.o
 endif
 
+ifdef SWITCH
+MODULE_OBJS += \
+	switch/switch-main.o \
+	switch/switch.o
+endif
+
 # We don't use rules.mk but rather manually update OBJS and MODULE_DIRS.
 MODULE_OBJS := $(addprefix $(MODULE)/, $(MODULE_OBJS))
 OBJS := $(MODULE_OBJS) $(OBJS)
diff --git a/backends/platform/sdl/posix/posix-main.cpp b/backends/platform/sdl/posix/posix-main.cpp
index 7105ac69c3..72b1a66443 100644
--- a/backends/platform/sdl/posix/posix-main.cpp
+++ b/backends/platform/sdl/posix/posix-main.cpp
@@ -22,7 +22,7 @@
 
 #include "common/scummsys.h"
 
-#if defined(POSIX) && !defined(MACOSX) && !defined(SAMSUNGTV) && !defined(MAEMO) && !defined(WEBOS) && !defined(LINUXMOTO) && !defined(GPH_DEVICE) && !defined(GP2X) && !defined(DINGUX) && !defined(OPENPANDORA) && !defined(PLAYSTATION3) && !defined(PSP2) && !defined(ANDROIDSDL)
+#if defined(POSIX) && !defined(MACOSX) && !defined(SAMSUNGTV) && !defined(MAEMO) && !defined(WEBOS) && !defined(LINUXMOTO) && !defined(GPH_DEVICE) && !defined(GP2X) && !defined(DINGUX) && !defined(OPENPANDORA) && !defined(PLAYSTATION3) && !defined(PSP2) && !defined(ANDROIDSDL) && !defined(NINTENDO_SWITCH)
 
 #include "backends/platform/sdl/posix/posix.h"
 #include "backends/plugins/sdl/sdl-provider.h"
diff --git a/backends/platform/sdl/switch/switch-main.cpp b/backends/platform/sdl/switch/switch-main.cpp
new file mode 100644
index 0000000000..411d5608be
--- /dev/null
+++ b/backends/platform/sdl/switch/switch-main.cpp
@@ -0,0 +1,62 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include <switch.h>
+
+#define FORBIDDEN_SYMBOL_EXCEPTION_stdout
+#define FORBIDDEN_SYMBOL_EXCEPTION_stderr
+
+#include "common/scummsys.h"
+#include "backends/platform/sdl/switch/switch.h"
+#include "backends/plugins/sdl/sdl-provider.h"
+#include "base/main.h"
+
+int main(int argc, char *argv[]) {
+
+#ifdef __SWITCH_DEBUG__
+	socketInitializeDefault();
+	nxlinkStdio();
+#endif
+
+	// Create our OSystem instance
+	g_system = new OSystem_Switch();
+	assert(g_system);
+
+	// Pre initialize the backend
+	((OSystem_Switch *)g_system)->init();
+
+#ifdef DYNAMIC_MODULES
+	PluginManager::instance().addPluginProvider(new SDLPluginProvider());
+#endif
+
+	// Invoke the actual ScummVM main entry point:
+	int res = scummvm_main(argc, argv);
+
+	// Free OSystem
+	delete (OSystem_Switch *)g_system;
+
+#ifdef __SWITCH_DEBUG__
+	socketExit();
+#endif
+
+	return res;
+}
diff --git a/backends/platform/sdl/switch/switch.cpp b/backends/platform/sdl/switch/switch.cpp
new file mode 100644
index 0000000000..7ce3372d8d
--- /dev/null
+++ b/backends/platform/sdl/switch/switch.cpp
@@ -0,0 +1,111 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#define FORBIDDEN_SYMBOL_EXCEPTION_printf
+#define FORBIDDEN_SYMBOL_EXCEPTION_unistd_h
+
+#include <sys/stat.h>
+#include "common/scummsys.h"
+#include "common/config-manager.h"
+#include "backends/platform/sdl/switch/switch.h"
+#include "backends/events/switchsdl/switchsdl-events.h"
+#include "backends/saves/posix/posix-saves.h"
+#include "backends/fs/posix/posix-fs-factory.h"
+#include "backends/fs/posix/posix-fs.h"
+
+OSystem_Switch::OSystem_Switch(Common::String baseConfigName)
+	: _baseConfigName(baseConfigName) {
+}
+
+void OSystem_Switch::init() {
+	
+	// Initialze File System Factory
+	_fsFactory = new POSIXFilesystemFactory();
+
+	// Invoke parent implementation of this method
+	OSystem_SDL::init();
+}
+
+void OSystem_Switch::initBackend() {
+
+	ConfMan.registerDefault("joystick_num", 0);
+	ConfMan.registerDefault("fullscreen", true);
+	ConfMan.registerDefault("aspect_ratio", false);
+	ConfMan.registerDefault("gfx_mode", "2x");
+	ConfMan.registerDefault("output_rate", 48000);
+	ConfMan.registerDefault("touchpad_mouse_mode", true);
+
+	if (!ConfMan.hasKey("joystick_num")) {
+		ConfMan.setInt("joystick_num", 0);
+	}
+	if (!ConfMan.hasKey("fullscreen")) {
+		ConfMan.setBool("fullscreen", true);
+	}
+	if (!ConfMan.hasKey("aspect_ratio")) {
+		ConfMan.setBool("aspect_ratio", false);
+	}
+	if (!ConfMan.hasKey("gfx_mode")) {
+		ConfMan.set("gfx_mode", "2x");
+	}
+	if (!ConfMan.hasKey("output_rate")) {
+		ConfMan.setInt("output_rate", 48000);
+	}
+	if (!ConfMan.hasKey("touchpad_mouse_mode")) {
+		ConfMan.setBool("touchpad_mouse_mode", true);
+	}
+
+	// Create the savefile manager
+	if (_savefileManager == 0) {
+		_savefileManager = new POSIXSaveFileManager();
+	}
+
+	// Event source
+	if (_eventSource == 0) {
+		_eventSource = new SwitchEventSource();
+	}
+
+	// Invoke parent implementation of this method
+	OSystem_SDL::initBackend();
+}
+
+bool OSystem_Switch::hasFeature(Feature f) {
+	
+	if (f == kFeatureDisplayLogFile)
+		return false;
+	if (f == kFeatureOpenUrl)
+		return false;
+
+	return OSystem_SDL::hasFeature(f);
+}
+
+void OSystem_Switch::logMessage(LogMessageType::Type type, const char *message) {
+	printf("%s\n", message);
+}
+
+Common::String OSystem_Switch::getDefaultConfigFileName() {
+	return _baseConfigName;
+}
+
+Common::WriteStream *OSystem_Switch::createLogFile() {
+	Common::FSNode file("scummvm.log");
+	return file.createWriteStream();
+}
diff --git a/backends/platform/sdl/switch/switch.h b/backends/platform/sdl/switch/switch.h
new file mode 100644
index 0000000000..6578463897
--- /dev/null
+++ b/backends/platform/sdl/switch/switch.h
@@ -0,0 +1,50 @@
+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef PLATFORM_SDL_SWITCH_H
+#define PLATFORM_SDL_SWITCH_H
+
+#include "backends/platform/sdl/sdl.h"
+
+class OSystem_Switch : public OSystem_SDL {
+public:
+	// Let the subclasses be able to change _baseConfigName in the constructor
+	OSystem_Switch(Common::String baseConfigName = "scummvm.ini");
+	virtual ~OSystem_Switch() {}
+
+	virtual void init() override;
+	virtual void initBackend() override;
+	virtual bool hasFeature(Feature f) override;
+	virtual void logMessage(LogMessageType::Type type, const char *message) override;
+
+protected:
+	// Base string for creating the default path and filename
+	// for the configuration file
+	Common::String _baseConfigName;
+
+	virtual Common::String getDefaultConfigFileName() override;
+
+	virtual Common::WriteStream *createLogFile() override;
+};
+
+#endif
+
diff --git a/backends/platform/sdl/switch/switch.mk b/backends/platform/sdl/switch/switch.mk
new file mode 100644
index 0000000000..9c978a7917
--- /dev/null
+++ b/backends/platform/sdl/switch/switch.mk
@@ -0,0 +1,19 @@
+scummvm.nro: $(EXECUTABLE)
+	mkdir -p $(srcdir)/switch_release/scummvm/data
+	mkdir -p $(srcdir)/switch_release/scummvm/doc
+	nacptool --create "ScummVM" "Cpasjuste" "2.12" $(srcdir)/switch_release/scummvm.nacp
+	elf2nro $(EXECUTABLE) $(srcdir)/switch_release/scummvm/scummvm.nro --icon=$(srcdir)/dists/switch/icon.jpg --nacp=$(srcdir)/switch_release/scummvm.nacp
+
+scummvm_switch.zip: scummvm.nro
+	rm -f $(srcdir)/switch_release/scummvm.nacp
+	cp $(srcdir)/backends/vkeybd/packs/vkeybd_default.zip $(srcdir)/switch_release/scummvm/data
+	cp $(srcdir)/backends/vkeybd/packs/vkeybd_small.zip $(srcdir)/switch_release/scummvm/data
+	cp $(DIST_FILES_THEMES) $(srcdir)/switch_release/scummvm/data
+ifdef DIST_FILES_ENGINEDATA
+	cp $(DIST_FILES_ENGINEDATA) $(srcdir)/switch_release/scummvm/data
+endif
+	cp $(DIST_FILES_DOCS) $(srcdir)/switch_release/scummvm/doc/
+	cd $(srcdir)/switch_release && zip -r ../scummvm_switch.zip . && cd ..
+
+.PHONY: scummvm.nro scummvm_switch.zip
+
diff --git a/backends/saves/posix/posix-saves.cpp b/backends/saves/posix/posix-saves.cpp
index 444aa63f15..35f9fa2050 100644
--- a/backends/saves/posix/posix-saves.cpp
+++ b/backends/saves/posix/posix-saves.cpp
@@ -47,6 +47,9 @@ POSIXSaveFileManager::POSIXSaveFileManager() {
 	// Register default savepath.
 #if defined(SAMSUNGTV)
 	ConfMan.registerDefault("savepath", "/mtd_wiselink/scummvm savegames");
+#elif defined(NINTENDO_SWITCH)
+	Posix::assureDirectoryExists("./saves", nullptr);
+	ConfMan.registerDefault("savepath", "./saves");
 #else
 	Common::String savePath;
 
diff --git a/configure b/configure
index b4e8224fc5..d5883e9695 100755
--- a/configure
+++ b/configure
@@ -526,7 +526,7 @@ get_system_exe_extension() {
 	riscos)
 		_exeext=",e1f"
 		;;
-	3ds | dreamcast | ds | gamecube | n64 | ps2 | psp | wii)
+	3ds | dreamcast | ds | gamecube | n64 | ps2 | psp | switch | wii)
 		_exeext=".elf"
 		;;
 	gph-linux)
@@ -919,7 +919,7 @@ Configuration:
   -h, --help              display this help and exit
   --backend=BACKEND       backend to build (3ds, android, dc, dingux, ds, gcw0,
                           gph, iphone, ios7, linuxmoto, maemo, n64, null, openpandora,
-                          ps2, psp, psp2, samsungtv, sdl, tizen, webos, wii, wince) [sdl]
+                          ps2, psp, psp2, samsungtv, sdl, switch, tizen, webos, wii, wince) [sdl]
 
 Installation directories:
   --prefix=PREFIX         install architecture-independent files in PREFIX
@@ -972,6 +972,7 @@ Special configuration feature:
                                            psp2 for PlayStation Vita
                                            psp for PlayStation Portable
                                            samsungtv for Samsung TV
+                                           switch for Nintendo Switch
                                            tizen for Samsung Tizen
                                            webos for HP Palm WebOS
                                            wii for Nintendo Wii
@@ -1685,6 +1686,16 @@ samsungtv)
 	_host_cpu=arm
 	_host_alias=arm-linux-gnueabi
 	;;
+switch)
+	_host_os=switch
+	_host_cpu=arm
+	_host_alias=aarch64-none-elf
+	test "x$prefix" = xNONE && prefix=.
+	datarootdir='${prefix}/data'
+	datadir='${datarootdir}'
+	docdir='${prefix}/doc'
+	PKG_CONFIG_LIBDIR=$DEVKITPRO/portlibs/switch/lib/pkgconfig
+	;;
 tizen)
  	_host_os=tizen
 	_host_cpu=arm
@@ -1784,7 +1795,7 @@ android)
 		exit 1
 	fi
 	;;
-3ds | ds | gamecube | wii)
+3ds | ds | gamecube | switch | wii)
 	if test -z "$DEVKITPRO"; then
 		echo "Please set DEVKITPRO in your environment. export DEVKITPRO=<path to devkitPRO>"
 		exit 1
@@ -2101,7 +2112,7 @@ if test "$have_gcc" = yes ; then
 			case $_host_os in
 			# newlib-based system include files suppress non-C89 function
 			# declarations under __STRICT_ANSI__
-			3ds | amigaos* | android | androidsdl | dreamcast | ds | gamecube | mingw* | mint* | n64 | psp | ps2 | ps3 | psp2 | tizen | wii | wince )
+			3ds | amigaos* | android | androidsdl | dreamcast | ds | gamecube | mingw* | mint* | n64 | psp | ps2 | ps3 | psp2 | switch | tizen | wii | wince )
 				;;
 			*)
 				append_var CXXFLAGS "-ansi"
@@ -2175,7 +2186,7 @@ fi
 # However, some platforms use GNU extensions in system header files, so
 # for these we must not use -pedantic.
 case $_host_os in
-3ds | android | androidsdl | gamecube | ps2 | psp | tizen | wii | webos)
+3ds | android | androidsdl | gamecube | ps2 | psp | switch | tizen | wii | webos)
 	;;
 *)
 	# ICC does not support pedantic, while GCC and clang do.
@@ -2883,6 +2894,22 @@ case $_host_os in
 		# Needs -lbind -lsocket for the timidity MIDI driver
 		append_var LIBS "-lnsl -lsocket"
 		;;
+	switch)
+		_pkgconfig="$DEVKITPRO/portlibs/switch/bin/aarch64-none-elf-pkg-config"
+		_sdlpath="$DEVKITPRO/portlibs/switch/bin"
+		append_var DEFINES "-DSWITCH -D__SWITCH__ -DNINTENDO_SWITCH"
+		append_var CXXFLAGS "-march=armv8-a -mtune=cortex-a57 -mtp=soft -fPIE -ftls-model=local-exec"
+		append_var CXXFLAGS "-ffunction-sections -fdata-sections"
+		append_var CXXFLAGS "-I$DEVKITPRO/libnx/include -I$DEVKITPRO/portlibs/switch/include"
+		append_var LDFLAGS "-L$DEVKITPRO/libnx/lib -L$DEVKITPRO/portlibs/switch/lib"
+		append_var LDFLAGS "-specs=$DEVKITPRO/libnx/switch.specs"
+		add_line_to_config_mk 'SWITCH = 1'
+		if test "$_debug_build" = yes; then
+			append_var DEFINES "-D__SWITCH_DEBUG__"
+		else
+			_optimization_level=-O3
+		fi
+		;;
 	tizen)
 		add_line_to_config_mk "TIZEN_ROOTSTRAP = $TIZEN_ROOTSTRAP"
 		append_var LDFLAGS "--sysroot=${TIZEN_ROOTSTRAP}"
@@ -3374,6 +3401,19 @@ if test -n "$_host"; then
 			_mt32emu=no
 			_vkeybd=yes
 			;;
+		switch)
+			_backend="switch"
+			_opengl_mode=gles2
+			_build_scalers=yes
+			_build_hq_scalers=yes
+			_dynamic_modules=no
+			_vkeybd=yes
+			_mt32emu=yes
+			_vorbis=yes
+			_tremor=no
+			_eventrec=no
+			_port_mk="backends/platform/sdl/switch/switch.mk"
+			;;
 		tizen)
 			_unix=yes
 			_backend="tizen"
@@ -3566,6 +3606,10 @@ case $_backend in
 	sdl)
 		_sdl=auto
 		;;
+	switch)
+		_sdl=auto
+		append_var MODULES "backends/platform/sdl"
+		;;
 	tizen)
 		# dirent.h not available. NONSTANDARD_PORT==ensure portdefs.h is included
 		append_var DEFINES "-DTIZEN -DDISABLE_STDIO_FILESTREAM -DNONSTANDARD_PORT"
@@ -3686,7 +3730,7 @@ fi
 # Enable 16bit support only for backends which support it
 #
 case $_backend in
-	3ds | android | androidsdl | dingux | dc | gph | iphone | ios7 | maemo | openpandora | psp | psp2 | samsungtv | sdl | tizen | webos | wii)
+	3ds | android | androidsdl | dingux | dc | gph | iphone | ios7 | maemo | openpandora | psp | psp2 | samsungtv | sdl | switch | tizen | webos | wii)
 		if test "$_16bit" = auto ; then
 			_16bit=yes
 		else
@@ -3765,7 +3809,7 @@ case $_host_os in
 	amigaos* | cygwin* | dreamcast | ds | gamecube | mingw* | n64 | ps2 | ps3 | psp2 | psp | riscos | wii | wince)
 		_posix=no
 		;;
-	3ds | android | androidsdl | beos* | bsd* | darwin* | freebsd* | gnu* | gph-linux | haiku* | hpux* | iphone | ios7 | irix*| k*bsd*-gnu* | linux* | maemo | mint* | netbsd* | openbsd* | solaris* | sunos* | uclinux* | webos)
+	3ds | android | androidsdl | beos* | bsd* | darwin* | freebsd* | gnu* | gph-linux | haiku* | hpux* | iphone | ios7 | irix*| k*bsd*-gnu* | linux* | maemo | mint* | netbsd* | openbsd* | solaris* | sunos* | switch | uclinux* | webos)
 		_posix=yes
 		;;
 	os2-emx*)
diff --git a/dists/switch/icon.jpg b/dists/switch/icon.jpg
new file mode 100644
index 0000000000..a4df2811ef
--- /dev/null
+++ b/dists/switch/icon.jpg