3DS: Initial commit

15 files changed, 1638 insertions, 0 deletions

diff --git a/backends/platform/3ds/3ds.mk b/backends/platform/3ds/3ds.mk
new file mode 100644
index 0000000000..bd8e743e14
--- /dev/null
+++ b/backends/platform/3ds/3ds.mk
@@ -0,0 +1,53 @@
+TARGET := scummvm
+
+APP_TITLE       := ScummVM
+APP_DESCRIPTION := Point-and-click adventure game engines
+APP_AUTHOR      := ScummVM Team
+APP_ICON        := backends/platform/3ds/icon.png
+
+ARCH     := -march=armv6k -mtune=mpcore -mfloat-abi=hard -mtp=soft
+CXXFLAGS += -std=gnu++11
+ASFLAGS  += -mfloat-abi=hard
+LDFLAGS  += -specs=3dsx.specs $(ARCH) -L$(DEVKITPRO)/libctru/lib -L$(DEVKITPRO)/portlibs/3ds/lib
+
+.PHONY: clean_3ds
+
+all: $(TARGET).3dsx
+
+clean: clean_3ds
+
+clean_3ds:
+	$(RM) $(TARGET).3dsx
+
+$(TARGET).smdh: $(APP_ICON) $(MAKEFILE_LIST)
+	@smdhtool --create "$(APP_TITLE)" "$(APP_DESCRIPTION)" "$(APP_AUTHOR)" $(APP_ICON) $@
+	@echo built ... $(notdir $@)
+
+$(TARGET).3dsx: $(EXECUTABLE) $(TARGET).smdh
+	@3dsxtool $< $@ --smdh=$(TARGET).smdh
+	@echo built ... $(notdir $@)
+
+#---------------------------------------------------------------------------------
+# rules for assembling GPU shaders
+#---------------------------------------------------------------------------------
+define shader-as
+	$(eval FILEPATH := $(patsubst %.shbin.o,%.shbin,$@))
+	$(eval FILE := $(patsubst %.shbin.o,%.shbin,$(notdir $@)))
+	picasso -o $(FILEPATH) $1
+	bin2s $(FILEPATH) | $(AS) -o $@
+	echo "extern const u8" `(echo $(FILE) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(FILEPATH) | tr . _)`.h
+	echo "extern const u8" `(echo $(FILE) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(FILEPATH) | tr . _)`.h
+	echo "extern const u32" `(echo $(FILE) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(FILEPATH) | tr . _)`.h
+endef
+
+%.shbin.o : %.v.pica %.g.pica
+	@echo $(notdir $^)
+	@$(call shader-as,$^)
+
+%.shbin.o : %.v.pica
+	@echo $(notdir $<)
+	@$(call shader-as,$<)
+
+%.shbin.o : %.shlist
+	@echo $(notdir $<)
+	@$(call shader-as,$(foreach file,$(shell cat $<),$(dir $<)/$(file)))
diff --git a/backends/platform/3ds/gui.cpp b/backends/platform/3ds/gui.cpp
new file mode 100644
index 0000000000..0883d5a102
--- /dev/null
+++ b/backends/platform/3ds/gui.cpp
@@ -0,0 +1,46 @@
+/* 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 "backends/platform/3ds/gui.h"
+#include "common/system.h"
+
+StatusMessageDialog* StatusMessageDialog::_opened = 0;
+
+StatusMessageDialog::StatusMessageDialog(const Common::String &message, uint32 duration)
+	: MessageDialog(message, 0, 0) {
+	_timer = g_system->getMillis() + duration;
+	if (_opened)
+		_opened->close();
+	_opened = this;
+}
+
+void StatusMessageDialog::handleTickle() {
+	MessageDialog::handleTickle();
+	if (g_system->getMillis() > _timer)
+		close();
+}
+
+void StatusMessageDialog::close() {
+    GUI::Dialog::close();
+	if (_opened)
+		_opened = 0;
+}
diff --git a/backends/platform/3ds/gui.h b/backends/platform/3ds/gui.h
new file mode 100644
index 0000000000..66c6547139
--- /dev/null
+++ b/backends/platform/3ds/gui.h
@@ -0,0 +1,41 @@
+/* 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 GUI_3DS_H
+#define GUI_3DS_H
+
+#include "gui/message.h"
+
+class StatusMessageDialog : public GUI::MessageDialog {
+public:
+	StatusMessageDialog(const Common::String &message, uint32 duration);
+
+	void handleTickle();
+
+protected:
+	virtual void close();
+	
+	uint32 _timer;
+	static StatusMessageDialog* _opened;
+};
+
+#endif // GUI_3DS_H
diff --git a/backends/platform/3ds/icon.png b/backends/platform/3ds/icon.png
new file mode 100644
index 0000000000..07022fbac1
--- /dev/null
+++ b/backends/platform/3ds/icon.png
diff --git a/backends/platform/3ds/main.cpp b/backends/platform/3ds/main.cpp
new file mode 100644
index 0000000000..4b5dbbbbd2
--- /dev/null
+++ b/backends/platform/3ds/main.cpp
@@ -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.
+ *
+ */
+
+#define FORBIDDEN_SYMBOL_ALLOW_ALL
+
+#include "osystem.h"
+#include <3ds.h>
+
+int main(int argc, char *argv[]) {
+	// Initialize basic libctru stuff
+	gfxInitDefault();
+	cfguInit();
+	osSetSpeedupEnable(true);
+// 	consoleInit(GFX_TOP, NULL);
+
+	g_system = new OSystem_3DS();
+	assert(g_system);
+
+	// Invoke the actual ScummVM main entry point
+// 	if (argc > 2)
+// 		res = scummvm_main(argc-2, &argv[2]);
+// 	else
+// 		res = scummvm_main(argc, argv);
+	scummvm_main(0, nullptr);
+
+	delete dynamic_cast<OSystem_3DS*>(g_system);
+
+	cfguExit();
+	gfxExit();
+	return 0;
+}
diff --git a/backends/platform/3ds/module.mk b/backends/platform/3ds/module.mk
new file mode 100644
index 0000000000..9c1e26b181
--- /dev/null
+++ b/backends/platform/3ds/module.mk
@@ -0,0 +1,16 @@
+MODULE := backends/platform/3ds
+
+MODULE_OBJS := \
+	main.o \
+	shader.shbin.o \
+	sprite.o \
+	gui.o \
+	osystem.o \
+	osystem-graphics.o \
+	osystem-audio.o \
+	osystem-events.o
+
+# We don't use rules.mk but rather manually update OBJS and MODULE_DIRS.
+MODULE_OBJS := $(addprefix $(MODULE)/, $(MODULE_OBJS))
+OBJS := $(MODULE_OBJS) $(OBJS)
+MODULE_DIRS += $(sort $(dir $(MODULE_OBJS)))
diff --git a/backends/platform/3ds/osystem-audio.cpp b/backends/platform/3ds/osystem-audio.cpp
new file mode 100644
index 0000000000..7ff788b430
--- /dev/null
+++ b/backends/platform/3ds/osystem-audio.cpp
@@ -0,0 +1,107 @@
+/* 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 "osystem.h"
+
+static bool exitAudioThread = false;
+static bool hasAudio = false;
+
+static void audioThreadFunc(void* arg) {
+	Audio::MixerImpl *mixer = (Audio::MixerImpl *) arg;
+	OSystem_3DS *osys = (OSystem_3DS*)g_system;
+
+	int i;
+	const int channel = 0;
+	int bufferIndex = 0;
+	const int bufferCount = 3;
+	const int bufferSize = 80000; // Can't be too small, based on delayMillis duration
+	const int sampleRate = 22050;
+	int sampleLen = 0;
+	uint32 lastTime = osys->getMillis(true);
+	uint32 time = lastTime;
+	ndspWaveBuf buffers[bufferCount];
+	
+	for(i = 0; i < bufferCount; ++i) {
+		memset(&buffers[i], 0, sizeof(ndspWaveBuf));
+		buffers[i].data_vaddr = linearAlloc(bufferSize);
+		buffers[i].looping = false;
+		buffers[i].status = NDSP_WBUF_FREE;
+	}
+	
+	ndspChnReset(channel);
+	ndspChnSetInterp(channel, NDSP_INTERP_LINEAR);
+	ndspChnSetRate(channel, sampleRate);
+	ndspChnSetFormat(channel, NDSP_FORMAT_STEREO_PCM16);
+
+	while(!exitAudioThread) {
+		bufferIndex++;
+		bufferIndex %= bufferCount;
+		ndspWaveBuf* buf = &buffers[bufferIndex];
+		
+		osys->delayMillis(100); // Note: Increasing the delay requires a bigger buffer
+		
+		time = osys->getMillis(true);
+		sampleLen = (time - lastTime) * 22 * 4; // sampleRate / 1000 * channelCount * sizeof(int16);
+		lastTime = time;
+		
+		if (sampleLen > 0) {
+			buf->nsamples = mixer->mixCallback(buf->data_adpcm, sampleLen);
+			if (buf->nsamples > 0) {
+				DSP_FlushDataCache(buf->data_vaddr, bufferSize);
+				ndspChnWaveBufAdd(channel, buf);
+			}
+		}
+	}
+	
+	for(i = 0; i < bufferCount; ++i)
+		linearFree(buffers[i].data_pcm8);
+}
+
+void OSystem_3DS::initAudio() {
+	_mixer = new Audio::MixerImpl(this, 22050);
+	
+	hasAudio = R_SUCCEEDED(ndspInit());
+	_mixer->setReady(false);
+
+	if (hasAudio) {
+		s32 prio = 0;
+		svcGetThreadPriority(&prio, CUR_THREAD_HANDLE);
+		audioThread = threadCreate(&audioThreadFunc, _mixer, 32*1048, prio-1, -2, false);
+	}
+}
+
+void OSystem_3DS::destroyAudio() {
+	if (hasAudio) {
+		exitAudioThread = true;
+		threadJoin(audioThread, U64_MAX);
+		threadFree(audioThread);
+		ndspExit();
+	}
+	
+	delete _mixer;
+	_mixer = 0;
+}
+
+Audio::Mixer *OSystem_3DS::getMixer() {
+	assert(_mixer);
+	return _mixer;
+}
diff --git a/backends/platform/3ds/osystem-events.cpp b/backends/platform/3ds/osystem-events.cpp
new file mode 100644
index 0000000000..a4ce92c394
--- /dev/null
+++ b/backends/platform/3ds/osystem-events.cpp
@@ -0,0 +1,194 @@
+/* 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_ALLOW_ALL
+#include "backends/platform/3ds/gui.h"
+#include "osystem.h"
+
+static Common::Mutex *eventMutex;
+static bool exitEventThread = false;
+static InputMode inputMode = MODE_DRAG;
+
+static void pushEventQueue(Common::Queue<Common::Event>* queue, Common::Event& event) {
+	Common::StackLock lock(*eventMutex);
+	queue->push(event);
+}
+
+static void eventThreadFunc(void* arg) {
+	OSystem_3DS* osys = (OSystem_3DS*) g_system;
+	auto eventQueue = (Common::Queue<Common::Event>*) arg;
+	
+	uint32 touchStartTime = osys->getMillis();
+	touchPosition lastTouch = {0,0};
+	bool isRightClick = false;
+	Common::Event event;
+	
+	while(!exitEventThread) {
+		osys->delayMillis(10);
+		
+		hidScanInput();
+		touchPosition touch;
+		u32 held = hidKeysHeld();
+		u32 keysPressed = hidKeysDown();
+		u32 keysReleased = hidKeysUp();
+		
+		if (!aptMainLoop()) {
+			event.type = Common::EVENT_QUIT;
+			pushEventQueue(eventQueue, event);
+		}
+		if (held & KEY_TOUCH) {
+			hidTouchRead(&touch);
+			osys->transformPoint(touch);
+
+			osys->warpMouse(touch.px, touch.py);
+			event.mouse.x = touch.px;
+			event.mouse.y = touch.py;
+			
+			if (keysPressed & KEY_TOUCH) {
+				touchStartTime = osys->getMillis();
+				isRightClick = (held & KEY_X || held & KEY_DUP);
+				if (inputMode == MODE_DRAG) {
+					event.type = isRightClick ? Common::EVENT_RBUTTONDOWN : Common::EVENT_LBUTTONDOWN;
+					pushEventQueue(eventQueue, event);
+				}
+			}
+			else if (touch.px != lastTouch.px || touch.py != lastTouch.py) {
+				event.type = Common::EVENT_MOUSEMOVE;
+				pushEventQueue(eventQueue, event);
+			}
+			
+			lastTouch = touch;
+		}
+		else if (keysReleased & KEY_TOUCH) {
+			event.mouse.x = lastTouch.px;
+			event.mouse.y = lastTouch.py;
+			printf("clicked %u, %u\n", lastTouch.px, lastTouch.py);
+			if (inputMode == MODE_DRAG) {
+				event.type = isRightClick ? Common::EVENT_RBUTTONUP : Common::EVENT_LBUTTONUP;
+				pushEventQueue(eventQueue, event);
+			}
+			else if (osys->getMillis() - touchStartTime < 200) {
+				// Process click in MODE_HOVER
+				event.type = Common::EVENT_MOUSEMOVE;
+				pushEventQueue(eventQueue, event);
+				event.type = isRightClick ? Common::EVENT_RBUTTONDOWN : Common::EVENT_LBUTTONDOWN;
+				pushEventQueue(eventQueue, event);
+				event.type = isRightClick ? Common::EVENT_RBUTTONUP : Common::EVENT_LBUTTONUP;
+				pushEventQueue(eventQueue, event);
+			}
+		}
+		if (keysPressed & KEY_R) {
+			if (inputMode == MODE_DRAG) {
+				inputMode = MODE_HOVER;
+				osys->displayMessageOnOSD("Hover Mode");
+			} else {
+				inputMode = MODE_DRAG;
+				osys->displayMessageOnOSD("Drag Mode");
+			}
+		}
+		if (keysPressed & KEY_A || keysPressed & KEY_DLEFT) {
+			// SIMULATE LEFT CLICK
+			event.mouse.x = lastTouch.px;
+			event.mouse.y = lastTouch.py;
+			event.type = Common::EVENT_LBUTTONDOWN;
+			pushEventQueue(eventQueue, event);
+			event.type = Common::EVENT_LBUTTONUP;
+			pushEventQueue(eventQueue, event);
+		}
+		if (keysPressed & KEY_X || keysPressed & KEY_DUP) {
+			// SIMULATE RIGHT CLICK
+			event.mouse.x = lastTouch.px;
+			event.mouse.y = lastTouch.py;
+			event.type = Common::EVENT_RBUTTONDOWN;
+			pushEventQueue(eventQueue, event);
+			event.type = Common::EVENT_RBUTTONUP;
+			pushEventQueue(eventQueue, event);
+		}
+		if (keysPressed & KEY_L) {
+			event.type = Common::EVENT_VIRTUAL_KEYBOARD;
+			pushEventQueue(eventQueue, event);
+		}
+		if (keysPressed & KEY_START) {
+			event.type = Common::EVENT_MAINMENU;
+			pushEventQueue(eventQueue, event);
+		}
+		if (keysPressed & KEY_SELECT) {
+			event.type = Common::EVENT_RTL;
+			pushEventQueue(eventQueue, event);
+		}
+		if (keysPressed & KEY_B || keysReleased & KEY_B || keysPressed & KEY_DDOWN || keysReleased & KEY_DDOWN) {
+			if (keysPressed & KEY_B || keysPressed & KEY_DDOWN)
+				event.type = Common::EVENT_KEYDOWN;
+			else
+				event.type = Common::EVENT_KEYUP;
+			event.kbd.keycode = Common::KEYCODE_ESCAPE;
+			event.kbd.ascii = Common::ASCII_ESCAPE;
+			event.kbd.flags = 0;
+			pushEventQueue(eventQueue, event);
+		}
+
+		// TODO: EVENT_PREDICTIVE_DIALOG
+		// EVENT_SCREEN_CHANGED
+	}
+}
+
+void OSystem_3DS::initEvents() {
+	eventMutex = new Common::Mutex();
+	s32 prio = 0;
+	svcGetThreadPriority(&prio, CUR_THREAD_HANDLE);
+	_eventThread = threadCreate(&eventThreadFunc, &_eventQueue, 2048, prio-1, -2, false);
+}
+
+void OSystem_3DS::destroyEvents() {
+	exitEventThread = true;
+	threadJoin(_eventThread, U64_MAX);
+	threadFree(_eventThread);
+	delete eventMutex;
+}
+
+void OSystem_3DS::transformPoint(touchPosition &point) {
+	if (!_overlayVisible) {
+		point.px = static_cast<float>(point.px) / _gameTexture.getScaleX() - _gameX;
+		point.py = static_cast<float>(point.py) / _gameTexture.getScaleY() - _gameY;
+	}
+}
+
+void OSystem_3DS::displayMessageOnOSD(const char *msg) {
+	_messageOSD = msg;
+	_showMessageOSD = true;
+}
+
+bool OSystem_3DS::pollEvent(Common::Event &event) {
+	if (_showMessageOSD) {
+		_showMessageOSD = false;
+		StatusMessageDialog dialog(_messageOSD, 800);
+		dialog.runModal();
+	}
+	
+	Common::StackLock lock(*eventMutex);
+	
+	if (_eventQueue.empty())
+		return false;
+	
+	event = _eventQueue.pop();
+	return true;
+}
diff --git a/backends/platform/3ds/osystem-graphics.cpp b/backends/platform/3ds/osystem-graphics.cpp
new file mode 100644
index 0000000000..5e70dced73
--- /dev/null
+++ b/backends/platform/3ds/osystem-graphics.cpp
@@ -0,0 +1,465 @@
+/* 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_ALLOW_ALL
+#include "backends/platform/3ds/osystem.h"
+#include "backends/platform/3ds/shader_shbin.h"
+#include <common/rect.h>
+#include <algorithm>
+
+// Used to transfer the final rendered display to the framebuffer
+#define DISPLAY_TRANSFER_FLAGS                                                 \
+	(GX_TRANSFER_FLIP_VERT(0) | GX_TRANSFER_OUT_TILED(0) |                     \
+	 GX_TRANSFER_RAW_COPY(0) | GX_TRANSFER_IN_FORMAT(GX_TRANSFER_FMT_RGBA8) |  \
+	 GX_TRANSFER_OUT_FORMAT(GX_TRANSFER_FMT_RGB8) |                            \
+	 GX_TRANSFER_SCALING(GX_TRANSFER_SCALE_NO))
+
+void OSystem_3DS::initGraphics() {
+	_pfGame = Graphics::PixelFormat::createFormatCLUT8();
+	_pfGameTexture = Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0);
+
+	C3D_Init(C3D_DEFAULT_CMDBUF_SIZE);
+
+	// Initialize the render targets
+	_renderTargetTop =
+	    C3D_RenderTargetCreate(240, 400, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
+	C3D_RenderTargetSetClear(_renderTargetTop, C3D_CLEAR_ALL, 0x0000000, 0);
+	C3D_RenderTargetSetOutput(_renderTargetTop, GFX_TOP, GFX_LEFT,
+	                          DISPLAY_TRANSFER_FLAGS);
+
+	_renderTargetBottom =
+	    C3D_RenderTargetCreate(240, 320, GPU_RB_RGBA8, GPU_RB_DEPTH24_STENCIL8);
+	C3D_RenderTargetSetClear(_renderTargetBottom, C3D_CLEAR_ALL, 0x00000000, 0);
+	C3D_RenderTargetSetOutput(_renderTargetBottom, GFX_BOTTOM, GFX_LEFT,
+	                          DISPLAY_TRANSFER_FLAGS);
+
+	// Load and bind simple default shader (shader.v.pica)
+	_dvlb = DVLB_ParseFile((u32*)shader_shbin, shader_shbin_size);
+	shaderProgramInit(&_program);
+	shaderProgramSetVsh(&_program, &_dvlb->DVLE[0]);
+	C3D_BindProgram(&_program);
+	
+	_projectionLocation = shaderInstanceGetUniformLocation(_program.vertexShader, "projection");
+	_modelviewLocation = shaderInstanceGetUniformLocation(_program.vertexShader, "modelView");
+	
+	C3D_AttrInfo* attrInfo = C3D_GetAttrInfo();
+	AttrInfo_Init(attrInfo);
+	AttrInfo_AddLoader(attrInfo, 0, GPU_FLOAT, 3); // v0=position
+	AttrInfo_AddLoader(attrInfo, 1, GPU_FLOAT, 2); // v1=texcoord
+	
+	Mtx_OrthoTilt(&_projectionTop, 0.0, 400.0, 240.0, 0.0, 0.0, 1.0);
+	Mtx_OrthoTilt(&_projectionBottom, 0.0, 320.0, 240.0, 0.0, 0.0, 1.0);
+	
+	C3D_TexEnv* env = C3D_GetTexEnv(0);
+	C3D_TexEnvSrc(env, C3D_Both, GPU_TEXTURE0, 0, 0);
+	C3D_TexEnvOp(env, C3D_Both, 0, 0, 0);
+	C3D_TexEnvFunc(env, C3D_Both, GPU_REPLACE);
+	
+	C3D_DepthTest(false, GPU_GEQUAL, GPU_WRITE_ALL);
+	C3D_CullFace(GPU_CULL_NONE);
+}
+
+void OSystem_3DS::destroyGraphics() {
+	_gameScreen.free();
+	_gameTexture.free();
+	_overlay.free();
+
+	shaderProgramFree(&_program);
+	DVLB_Free(_dvlb);
+
+	C3D_RenderTargetDelete(_renderTargetTop);
+	C3D_RenderTargetDelete(_renderTargetBottom);
+
+	C3D_Fini();
+}
+
+bool OSystem_3DS::hasFeature(OSystem::Feature f) {
+	return (f == OSystem::kFeatureFullscreenMode ||
+	        f == OSystem::kFeatureCursorPalette ||
+	        f == OSystem::kFeatureOverlaySupportsAlpha);
+}
+
+void OSystem_3DS::setFeatureState(OSystem::Feature f, bool enable) {
+	switch (f) {
+	case OSystem::kFeatureFullscreenMode:
+		_isFullscreen = enable;
+		break;
+	case OSystem::kFeatureCursorPalette:
+		_cursorPaletteEnabled = enable;
+		flushCursor();
+		break;
+	default:
+		break;
+	}
+}
+
+bool OSystem_3DS::getFeatureState(OSystem::Feature f) {
+	switch (f) {
+	case OSystem::kFeatureFullscreenMode:
+		return _isFullscreen;
+	case OSystem::kFeatureCursorPalette:
+		return _cursorPaletteEnabled;
+	default:
+		return false;
+	}
+}
+
+const OSystem::GraphicsMode *
+OSystem_3DS::getSupportedGraphicsModes() const {
+	return s_graphicsModes;
+}
+
+int OSystem_3DS::getDefaultGraphicsMode() const {
+	return GFX_LINEAR;
+}
+
+bool OSystem_3DS::setGraphicsMode(int mode) {
+	return true;
+}
+
+void OSystem_3DS::resetGraphicsScale() {
+	printf("resetGraphicsScale\n");
+}
+
+int OSystem_3DS::getGraphicsMode() const {
+	return GFX_LINEAR;
+}
+void OSystem_3DS::initSize(uint width, uint height,
+                                   const Graphics::PixelFormat *format) {
+	printf("3ds initsize w:%d h:%d\n", width, height);
+	_gameWidth = width;
+	_gameHeight = height;
+	_gameTexture.create(width, height, _pfGameTexture);
+	_overlay.create(getOverlayWidth(), getOverlayHeight(), _pfGameTexture);
+	
+	if (format) {
+		printf("pixelformat: %d %d %d %d %d\n", format->bytesPerPixel, format->rBits(), format->gBits(), format->bBits(), format->aBits());;
+		_pfGame = *format;
+	}
+
+	_gameScreen.create(width, height, _pfGame);
+	
+	_focusDirty = true;
+	_focusRect = Common::Rect(_gameWidth, _gameHeight);
+
+	if (_isFullscreen) {
+		_gameRatio = 320.f / 240.f;
+		_gameX = _gameY = 0;
+		_gameTexture.setScale(320.f / width, 240.f / height);
+	} else {
+		_gameRatio = static_cast<float>(width) / height;
+		if (width > height) {
+			_gameX = 0;
+			_gameY = (240.f - 320.f / width * height) / 2.f;
+		} else {
+			_gameY = 0;
+			_gameX = (320.f - 240.f / height * width) / 2.f;
+		}
+		_gameTexture.setScale((width > 320) ? 320.f / width : 1.f,
+		                      (height > 240) ? 240.f / height : 1.f);
+	}
+	_gameTexture.setPosition(_gameX, _gameY);
+	_cursorTexture.setScale(_gameTexture.getScaleX(), _gameTexture.getScaleY());
+}
+
+Common::List<Graphics::PixelFormat> OSystem_3DS::getSupportedFormats() const {
+	Common::List<Graphics::PixelFormat> list;
+	list.push_back(Graphics::PixelFormat(4, 8, 8, 8, 8, 24, 16, 8, 0)); // GPU_RGBA8
+	list.push_back(Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0)); // GPU_RGB565
+// 		list.push_back(Graphics::PixelFormat(3, 0, 0, 0, 8, 0, 8, 16, 0)); // GPU_RGB8
+	list.push_back(Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0)); // RGB555 (needed for FMTOWNS?)
+	list.push_back(Graphics::PixelFormat(2, 5, 5, 5, 1, 11, 6, 1, 0)); // GPU_RGBA5551
+	list.push_back(Graphics::PixelFormat::createFormatCLUT8());
+	return list;
+}
+
+void OSystem_3DS::beginGFXTransaction() {
+	//
+}
+OSystem::TransactionError OSystem_3DS::endGFXTransaction() {
+	return OSystem::kTransactionSuccess;
+}
+
+void OSystem_3DS::setPalette(const byte *colors, uint start, uint num) {
+// 	printf("setPalette\n");
+	assert(start + num <= 256);
+	memcpy(_palette + 3 * start, colors, 3 * num);
+	
+	// Manually update all color that were changed
+	if (_gameScreen.format.bytesPerPixel == 1) {
+		flushGameScreen();
+	}
+}
+void OSystem_3DS::grabPalette(byte *colors, uint start, uint num) {
+// 	printf("grabPalette\n");
+	assert(start + num <= 256);
+	memcpy(colors, _palette + 3 * start, 3 * num);
+}
+
+void OSystem_3DS::copyRectToScreen(const void *buf, int pitch, int x,
+                                           int y, int w, int h) {
+	Common::Rect rect(x, y, x+w, y+h);
+	_gameScreen.copyRectToSurface(buf, pitch, x, y, w, h);
+	Graphics::Surface subSurface = _gameScreen.getSubArea(rect);
+	
+	Graphics::Surface *convertedSubSurface = subSurface.convertTo(_pfGameTexture, _palette);
+	_gameTexture.copyRectToSurface(*convertedSubSurface, x, y, Common::Rect(w, h));
+	
+	convertedSubSurface->free();
+	delete convertedSubSurface;
+	_gameTexture.markDirty();
+}
+
+void OSystem_3DS::flushGameScreen() {
+	Graphics::Surface *converted = _gameScreen.convertTo(_pfGameTexture, _palette);
+	_gameTexture.copyRectToSurface(*converted, 0, 0, Common::Rect(converted->w, converted->h));
+	_gameTexture.markDirty();
+	converted->free();
+	delete converted;
+}
+
+Graphics::Surface *OSystem_3DS::lockScreen() {
+	printf("lockScreen\n");
+	return &_gameScreen;
+}
+void OSystem_3DS::unlockScreen() {
+	printf("unlockScreen\n");
+	flushGameScreen();
+}
+
+void OSystem_3DS::updateScreen() {
+	
+	updateFocus();
+
+	C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
+		// Render top screen
+		C3D_FrameDrawOn(_renderTargetTop);
+		C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, _projectionLocation, &_projectionTop);
+		C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, _modelviewLocation, &_focusMatrix);
+		_gameTexture.render();
+		_gameTexture.render();
+		
+		// Render bottom screen
+		C3D_FrameDrawOn(_renderTargetBottom);
+		C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, _projectionLocation, &_projectionBottom);
+		C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, _modelviewLocation, _gameTexture.getMatrix());
+		_gameTexture.render();
+		if (_overlayVisible) {
+			C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, _modelviewLocation, _overlay.getMatrix());
+			_overlay.render();
+		}
+		if (_cursorVisible) {
+			C3D_FVUnifMtx4x4(GPU_VERTEX_SHADER, _modelviewLocation, _cursorTexture.getMatrix());
+			_cursorTexture.render();
+		}
+	C3D_FrameEnd(0);
+}
+
+void OSystem_3DS::setShakePos(int shakeOffset) {
+	// TODO: implement this in overlay, top screen, and mouse too
+	_screenShakeOffset = shakeOffset;
+	_gameTexture.setPosition(_gameX, _gameY + shakeOffset);
+}
+
+void OSystem_3DS::setFocusRectangle(const Common::Rect &rect) {
+// 	printf("setfocus: %d %d %d %d\n", rect.left, rect.top, rect.width(), rect.height());
+	_focusRect = rect;
+	_focusDirty = true;
+	_focusClearTime = 0;
+}
+
+void OSystem_3DS::clearFocusRectangle() {
+	_focusClearTime = getMillis();
+}
+
+void OSystem_3DS::updateFocus() {
+	
+	if (_focusClearTime && getMillis() - _focusClearTime > 5000) {
+		_focusClearTime = 0;
+		_focusDirty = true;
+		_focusRect = Common::Rect(_gameWidth, _gameHeight);
+	}
+
+	if (_focusDirty) {
+		float duration = 1.f / 20.f; // Focus animation in frame duration
+		float w = 400.f;
+		float h = 240.f;
+		float ratio = _focusRect.width() / _focusRect.height();
+		if (ratio > w/h) {
+			_focusTargetScaleX = w / _focusRect.width();
+			float newHeight = (float)_focusRect.width() / w/h;
+			_focusTargetScaleY = h / newHeight;
+			_focusTargetPosX = _focusTargetScaleX * _focusRect.left;
+			_focusTargetPosY = _focusTargetScaleY * ((float)_focusRect.top - (newHeight - _focusRect.height())/2.f);
+		} else {
+			_focusTargetScaleY = h / _focusRect.height();
+			float newWidth = (float)_focusRect.height() * w/h;
+			_focusTargetScaleX = w / newWidth;
+			_focusTargetPosY = _focusTargetScaleY * _focusRect.top;
+			_focusTargetPosX = _focusTargetScaleX * ((float)_focusRect.left - (newWidth - _focusRect.width())/2.f);
+		}
+		if (_focusTargetPosX < 0 && _focusTargetScaleY != 240.f / _gameHeight)
+			_focusTargetPosX = 0;
+		if (_focusTargetPosY < 0 && _focusTargetScaleX != 400.f / _gameWidth)
+			_focusTargetPosY = 0;
+		_focusStepPosX = duration * (_focusTargetPosX - _focusPosX);
+		_focusStepPosY = duration * (_focusTargetPosY - _focusPosY);
+		_focusStepScaleX = duration * (_focusTargetScaleX - _focusScaleX);
+		_focusStepScaleY = duration * (_focusTargetScaleY - _focusScaleY);
+	}
+	
+	if (_focusDirty || _focusPosX != _focusTargetPosX || _focusPosY != _focusTargetPosY ||
+			_focusScaleX != _focusTargetScaleX || _focusScaleY != _focusTargetScaleY) {
+		_focusDirty = false;
+	
+		if ((_focusStepPosX > 0 && _focusPosX > _focusTargetPosX) || (_focusStepPosX < 0 && _focusPosX < _focusTargetPosX))
+			_focusPosX = _focusTargetPosX;
+		else if (_focusPosX != _focusTargetPosX)
+			_focusPosX += _focusStepPosX;
+		
+		if ((_focusStepPosY > 0 && _focusPosY > _focusTargetPosY) || (_focusStepPosY < 0 && _focusPosY < _focusTargetPosY))
+			_focusPosY = _focusTargetPosY;
+		else if (_focusPosY != _focusTargetPosY)
+			_focusPosY += _focusStepPosY;
+		
+		if ((_focusStepScaleX > 0 && _focusScaleX > _focusTargetScaleX) || (_focusStepScaleX < 0 && _focusScaleX < _focusTargetScaleX))
+			_focusScaleX = _focusTargetScaleX;
+		else if (_focusScaleX != _focusTargetScaleX)
+			_focusScaleX += _focusStepScaleX;
+		
+		if ((_focusStepScaleY > 0 && _focusScaleY > _focusTargetScaleY) || (_focusStepScaleY < 0 && _focusScaleY < _focusTargetScaleY))
+			_focusScaleY = _focusTargetScaleY;
+		else if (_focusScaleY != _focusTargetScaleY)
+			_focusScaleY += _focusStepScaleY;
+
+		Mtx_Identity(&_focusMatrix);
+		Mtx_Translate(&_focusMatrix, -_focusPosX, -_focusPosY, 0);
+		Mtx_Scale(&_focusMatrix, _focusScaleX, _focusScaleY, 1.f);
+	}
+}
+
+void OSystem_3DS::showOverlay() {
+	_overlayVisible = true;
+	_cursorTexture.setScale(1.f, 1.f);
+	updateScreen();
+}
+
+void OSystem_3DS::hideOverlay() {
+	_overlayVisible = false;
+	_cursorTexture.setScale(_gameTexture.getScaleX(), _gameTexture.getScaleY());
+	updateScreen();
+}
+
+Graphics::PixelFormat OSystem_3DS::getOverlayFormat() const {
+	return _pfGameTexture;
+}
+
+void OSystem_3DS::clearOverlay() {
+	_overlay.clear();
+}
+
+void OSystem_3DS::grabOverlay(void *buf, int pitch) {
+	for(int y = 0; y < getOverlayHeight(); ++y) {
+		memcpy(buf, _overlay.getBasePtr(0, y), pitch);
+	}
+}
+
+void OSystem_3DS::copyRectToOverlay(const void *buf, int pitch, int x,
+                                            int y, int w, int h) {
+	_overlay.copyRectToSurface(buf, pitch, x, y, w, h);
+	_overlay.markDirty();
+}
+
+int16 OSystem_3DS::getOverlayHeight() {
+	return 240;
+}
+
+int16 OSystem_3DS::getOverlayWidth() {
+	return 320;
+}
+
+bool OSystem_3DS::showMouse(bool visible) {
+	_cursorVisible = visible;
+	flushCursor();
+	return !visible;
+}
+
+void OSystem_3DS::warpMouse(int x, int y) {
+	_cursorX = x;
+	_cursorY = y;
+	// TODO: adjust for _cursorScalable ?
+	_cursorTexture.setPosition(x - _cursorHotspotX + (_overlayVisible ? 0 : _gameX),
+							   y - _cursorHotspotY + (_overlayVisible ? 0 : _gameY));
+}
+
+void OSystem_3DS::setMouseCursor(const void *buf, uint w, uint h,
+                                         int hotspotX, int hotspotY,
+                                         uint32 keycolor, bool dontScale,
+                                         const Graphics::PixelFormat *format) {
+	_cursorScalable = !dontScale;
+	_cursorHotspotX = hotspotX;
+	_cursorHotspotY = hotspotY;
+	_cursorKeyColor = keycolor;
+	_pfCursor = !format ? Graphics::PixelFormat::createFormatCLUT8() : *format;
+
+	if (w != _cursor.w || h != _cursor.h || _cursor.format != _pfCursor) {
+		_cursor.create(w, h, _pfCursor);
+		_cursorTexture.create(w, h, _pfGameTexture);
+	}
+	
+	_cursor.copyRectToSurface(buf, w, 0, 0, w, h);
+	flushCursor();
+	
+	warpMouse(_cursorX, _cursorY);
+}
+
+void OSystem_3DS::setCursorPalette(const byte *colors, uint start, uint num) {
+	assert(start + num <= 256);
+	memcpy(_cursorPalette + 3 * start, colors, 3 * num);
+	_cursorPaletteEnabled = true;
+	flushCursor();
+}
+
+void OSystem_3DS::flushCursor() {
+	if (_cursor.getPixels()) {
+		Graphics::Surface *converted = _cursor.convertTo(_pfGameTexture, _cursorPaletteEnabled ? _cursorPalette : _palette);
+		_cursorTexture.copyRectToSurface(*converted, 0, 0, Common::Rect(converted->w, converted->h));
+		_cursorTexture.markDirty();
+		converted->free();
+		delete converted;
+	
+		if (_pfCursor.bytesPerPixel == 1) {
+			uint* dest = (uint*) _cursorTexture.getPixels();
+			byte* src = (byte*) _cursor.getPixels();
+			for (int y = 0; y < _cursor.h; ++y) {
+				for (int x = 0; x < _cursor.w; ++x) {
+					if (*src++ == _cursorKeyColor)
+						*dest++ = 0;
+					else
+						dest++;
+				}
+				dest += _cursorTexture.w - _cursorTexture.actualWidth;
+			}
+		}
+	}
+}
diff --git a/backends/platform/3ds/osystem.cpp b/backends/platform/3ds/osystem.cpp
new file mode 100644
index 0000000000..fa2980a361
--- /dev/null
+++ b/backends/platform/3ds/osystem.cpp
@@ -0,0 +1,173 @@
+/* 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_ALLOW_ALL
+
+#include "osystem.h"
+
+#include "backends/saves/default/default-saves.h"
+#include "backends/timer/default/default-timer.h"
+#include "backends/events/default/default-events.h"
+#include "audio/mixer_intern.h"
+#include "common/scummsys.h"
+#include "common/config-manager.h"
+#include "common/str.h"
+
+#include "backends/fs/posix/posix-fs-factory.h"
+#include "backends/fs/posix/posix-fs.h"
+#include <unistd.h>
+#include <time.h>
+
+OSystem_3DS::OSystem_3DS():
+_focusDirty(true),
+_focusRect(Common::Rect(1,1)),
+_focusPosX(0),
+_focusPosY(0),
+_focusTargetPosX(0),
+_focusTargetPosY(0),
+_focusStepPosX(0),
+_focusStepPosY(0),
+_focusScaleX(1.f),
+_focusScaleY(1.f),
+_focusTargetScaleX(1.f),
+_focusTargetScaleY(1.f),
+_focusStepScaleX(0.f),
+_focusStepScaleY(0.f),
+_focusClearTime(0),
+_showMessageOSD(false),
+_isFullscreen(false),
+_cursorVisible(false),
+_cursorScalable(false),
+_cursorPaletteEnabled(false),
+_cursorX(0),
+_cursorY(0),
+_cursorHotspotX(0),
+_cursorHotspotY(0),
+_gameX(0),
+_gameY(0),
+_gameWidth(320),
+_gameHeight(240) {
+	chdir("/");
+	_fsFactory = new POSIXFilesystemFactory();
+	Posix::assureDirectoryExists("/3ds/scummvm/saves/");
+}
+
+OSystem_3DS::~OSystem_3DS() {
+	destroyEvents();
+	destroyAudio();
+	destroyGraphics();
+	
+	delete _timerManager;
+	_timerManager = 0;
+}
+
+void OSystem_3DS::quit() {
+	//
+}
+
+void OSystem_3DS::initBackend() {
+	ConfMan.registerDefault("fullscreen", true);
+	ConfMan.registerDefault("aspect_ratio", true);
+	if (!ConfMan.hasKey("vkeybd_pack_name"))
+		ConfMan.set("vkeybd_pack_name", "vkeybd_small");
+	if (!ConfMan.hasKey("vkeybdpath"))
+		ConfMan.set("vkeybdpath", "/3ds/scummvm/kb");
+	if (!ConfMan.hasKey("themepath"))
+		ConfMan.set("themepath", "/3ds/scummvm");
+	if (!ConfMan.hasKey("gui_theme"))
+		ConfMan.set("gui_theme", "builtin");
+
+	_timerManager = new DefaultTimerManager();
+	_savefileManager = new DefaultSaveFileManager("/3ds/scummvm/saves/");
+	
+	initGraphics();
+	initAudio();
+	initEvents();
+	EventsBaseBackend::initBackend();
+}
+
+Common::String OSystem_3DS::getDefaultConfigFileName() {
+	return "/3ds/scummvm/scummvm.ini";
+}
+
+uint32 OSystem_3DS::getMillis(bool skipRecord) {
+	return svcGetSystemTick() / TICKS_PER_MSEC;
+}
+
+void OSystem_3DS::delayMillis(uint msecs) {
+	svcSleepThread(msecs * 1000000);
+}
+
+void OSystem_3DS::getTimeAndDate(TimeDate& td) const {
+	time_t curTime = time(0);
+	struct tm t = *localtime(&curTime);
+	td.tm_sec = t.tm_sec;
+	td.tm_min = t.tm_min;
+	td.tm_hour = t.tm_hour;
+	td.tm_mday = t.tm_mday;
+	td.tm_mon = t.tm_mon;
+	td.tm_year = t.tm_year;
+	td.tm_wday = t.tm_wday;
+}
+
+OSystem::MutexRef OSystem_3DS::createMutex() {
+	RecursiveLock* mutex = new RecursiveLock();
+	RecursiveLock_Init(mutex);
+	return (OSystem::MutexRef) mutex;
+}
+void OSystem_3DS::lockMutex(MutexRef mutex) {
+	RecursiveLock_Lock((RecursiveLock *)mutex);
+}
+void OSystem_3DS::unlockMutex(MutexRef mutex) {
+	RecursiveLock_Unlock((RecursiveLock *)mutex);
+}
+void OSystem_3DS::deleteMutex(MutexRef mutex) {
+	delete (RecursiveLock *)mutex;
+}
+
+Common::String OSystem_3DS::getSystemLanguage() const {
+	u8 langcode;
+	CFGU_GetSystemLanguage(&langcode);
+	switch (langcode) {
+		case CFG_LANGUAGE_JP: return "ja_JP";
+		case CFG_LANGUAGE_EN: return "en_US";
+		case CFG_LANGUAGE_FR: return "fr_FR";
+		case CFG_LANGUAGE_DE: return "de_DE";
+		case CFG_LANGUAGE_IT: return "it_IT";
+		case CFG_LANGUAGE_ES: return "es_ES";
+		case CFG_LANGUAGE_ZH: return "zh_CN";
+		case CFG_LANGUAGE_KO: return "ko_KR";
+		case CFG_LANGUAGE_NL: return "nl_NL";
+		case CFG_LANGUAGE_PT: return "pt_BR";
+		case CFG_LANGUAGE_RU: return "ru_RU";
+		case CFG_LANGUAGE_TW: return "zh_HK";
+		default:              return "en_US";
+	}
+}
+
+void OSystem_3DS::fatalError() {
+	printf("FatalError!\n");
+}
+
+void OSystem_3DS::logMessage(LogMessageType::Type type, const char *message) {
+	printf("3DS log: %s\n", message);
+}
diff --git a/backends/platform/3ds/osystem.h b/backends/platform/3ds/osystem.h
new file mode 100644
index 0000000000..98d9ad0cb6
--- /dev/null
+++ b/backends/platform/3ds/osystem.h
@@ -0,0 +1,210 @@
+/* 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_3DS_H
+#define PLATFORM_3DS_H
+
+#include <citro3d.h>
+#include "backends/mutex/mutex.h"
+#include "backends/base-backend.h"
+#include "graphics/palette.h"
+#include "base/main.h"
+#include "audio/mixer_intern.h"
+#include "backends/graphics/graphics.h"
+#include "backends/platform/3ds/sprite.h"
+#include "common/rect.h"
+#include "common/queue.h"
+
+#define TICKS_PER_MSEC 268123
+	
+enum {
+	GFX_LINEAR = 0,
+	GFX_NEAREST = 1
+};
+
+enum InputMode {
+	MODE_HOVER,
+	MODE_DRAG,
+};
+
+static const OSystem::GraphicsMode s_graphicsModes[] = {
+	{"default", "Default Test", GFX_LINEAR},
+	{ 0, 0, 0 }
+};
+
+class OSystem_3DS : public EventsBaseBackend, public PaletteManager {
+public:
+	OSystem_3DS();
+	~OSystem_3DS();
+
+	virtual void initBackend();
+	
+	virtual bool hasFeature(OSystem::Feature f);
+	virtual void setFeatureState(OSystem::Feature f, bool enable);
+	virtual bool getFeatureState(OSystem::Feature f);
+
+	virtual bool pollEvent(Common::Event &event);
+
+	virtual uint32 getMillis(bool skipRecord = false);
+	virtual void delayMillis(uint msecs);
+	virtual void getTimeAndDate(TimeDate &t) const;
+	
+	virtual MutexRef createMutex();
+	virtual void lockMutex(MutexRef mutex);
+	virtual void unlockMutex(MutexRef mutex);
+	virtual void deleteMutex(MutexRef mutex);
+
+	virtual void logMessage(LogMessageType::Type type, const char *message);
+	
+	virtual Audio::Mixer *getMixer();
+	virtual PaletteManager *getPaletteManager() { return this; }
+	virtual Common::String getSystemLanguage() const;
+	virtual void fatalError();
+	virtual void quit();
+	
+	virtual Common::String getDefaultConfigFileName();
+	
+	// Graphics
+	virtual const OSystem::GraphicsMode *getSupportedGraphicsModes() const;
+	int getDefaultGraphicsMode() const;
+	bool setGraphicsMode(int mode);
+	void resetGraphicsScale();
+	int getGraphicsMode() const;
+	inline Graphics::PixelFormat getScreenFormat() const { return _pfGame; }
+	virtual Common::List<Graphics::PixelFormat> getSupportedFormats() const;
+	void initSize(uint width, uint height,
+	              const Graphics::PixelFormat *format = NULL);
+	virtual int getScreenChangeID() const { return 0; };
+
+	void beginGFXTransaction();
+	OSystem::TransactionError endGFXTransaction();
+	int16 getHeight(){ return _gameHeight; }
+	int16 getWidth(){ return _gameWidth; }
+	void setPalette(const byte *colors, uint start, uint num);
+	void grabPalette(byte *colors, uint start, uint num);
+	void copyRectToScreen(const void *buf, int pitch, int x, int y, int w,
+	                      int h);
+	Graphics::Surface *lockScreen();
+	void unlockScreen();
+	void updateScreen();
+	void setShakePos(int shakeOffset);
+	void setFocusRectangle(const Common::Rect &rect);
+	void clearFocusRectangle();
+	void showOverlay();
+	void hideOverlay();
+	Graphics::PixelFormat getOverlayFormat() const;
+	void clearOverlay();
+	void grabOverlay(void *buf, int pitch);
+	void copyRectToOverlay(const void *buf, int pitch, int x, int y, int w,
+	                       int h);
+	virtual int16 getOverlayHeight();
+	virtual int16 getOverlayWidth();
+	virtual void displayMessageOnOSD(const char *msg);
+
+	bool showMouse(bool visible);
+	void warpMouse(int x, int y);
+	void setMouseCursor(const void *buf, uint w, uint h, int hotspotX,
+	                    int hotspotY, uint32 keycolor, bool dontScale = false,
+	                    const Graphics::PixelFormat *format = NULL);
+	void setCursorPalette(const byte *colors, uint start, uint num);
+	
+	void transformPoint(touchPosition &point);
+	
+	void updateFocus();
+	
+private:
+	void initGraphics();
+	void destroyGraphics();
+	void initAudio();
+	void destroyAudio();
+	void initEvents();
+	void destroyEvents();
+	
+	void flushGameScreen();
+	void flushCursor();
+	
+protected:
+	Audio::MixerImpl *_mixer;
+	
+private:
+	u16 _gameWidth, _gameHeight;
+	u16 _gameX, _gameY;
+	float _gameRatio;
+	
+	// Audio
+	Thread audioThread;
+
+	// Graphics
+	Graphics::PixelFormat _pfGame;
+	Graphics::PixelFormat _pfGameTexture;
+	Graphics::PixelFormat _pfCursor;
+	byte _palette[3 * 256];
+	byte _cursorPalette[3 * 256];
+	
+	Graphics::Surface _gameScreen;
+	Sprite _gameTexture;
+	Sprite _overlay;
+	
+	int _screenShakeOffset;
+	bool _overlayVisible;
+	bool _isFullscreen;
+	
+	DVLB_s *_dvlb;
+	shaderProgram_s _program;
+	int _projectionLocation;
+	int _modelviewLocation;
+	C3D_Mtx _projectionTop;
+	C3D_Mtx _projectionBottom;
+	C3D_RenderTarget* _renderTargetTop;
+	C3D_RenderTarget* _renderTargetBottom;
+	
+	// Focus
+	Common::Rect _focusRect;
+	bool _focusDirty;
+	C3D_Mtx _focusMatrix;
+	int _focusPosX, _focusPosY;
+	int _focusTargetPosX, _focusTargetPosY;
+	float _focusStepPosX, _focusStepPosY;
+	float _focusScaleX, _focusScaleY;
+	float _focusTargetScaleX, _focusTargetScaleY;
+	float _focusStepScaleX, _focusStepScaleY;
+	uint32 _focusClearTime;
+	
+	// Events
+	Thread _eventThread;
+	Common::Queue<Common::Event> _eventQueue;
+
+	Common::String _messageOSD;
+	bool _showMessageOSD;
+	
+	// Cursor
+	Graphics::Surface _cursor;
+	Sprite _cursorTexture;
+	bool _cursorPaletteEnabled;
+	bool _cursorVisible;
+	bool _cursorScalable;
+	int _cursorX, _cursorY;
+	int _cursorHotspotX, _cursorHotspotY;
+	uint32 _cursorKeyColor;
+};
+
+#endif
diff --git a/backends/platform/3ds/portdefs.h b/backends/platform/3ds/portdefs.h
new file mode 100644
index 0000000000..f58cf5a675
--- /dev/null
+++ b/backends/platform/3ds/portdefs.h
@@ -0,0 +1,28 @@
+/* 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 _PORTDEFS_H_
+#define _PORTDEFS_H_
+
+#define LURE_CLICKABLE_MENUS
+
+#endif
diff --git a/backends/platform/3ds/shader.v.pica b/backends/platform/3ds/shader.v.pica
new file mode 100644
index 0000000000..a359768218
--- /dev/null
+++ b/backends/platform/3ds/shader.v.pica
@@ -0,0 +1,40 @@
+; PICA200 vertex shader
+
+; Uniforms
+.fvec projection[4], modelView[4]
+
+; Constants
+.constf myconst(0.0, 1.0, -1.0, 0.1)
+.alias  zeros myconst.xxxx ; Vector full of zeros
+.alias  ones  myconst.yyyy ; Vector full of ones
+
+; Outputs
+.out outpos position
+.out outtex texcoord0
+
+; Inputs (defined as aliases for convenience)
+.alias inpos v0
+.alias intex v1
+
+.proc main
+	; Force the w component of inpos to be 1.0
+	mov r0.xyz, inpos
+	mov r0.w,   ones
+	
+	; r1 = modelView * inpos
+	dp4 r1.x, modelView[0], r0
+	dp4 r1.y, modelView[1], r0
+	dp4 r1.z, modelView[2], r0
+	dp4 r1.w, modelView[3], r0
+
+	; outpos = projection * r1
+	dp4 outpos.x, projection[0], r1
+	dp4 outpos.y, projection[1], r1
+	dp4 outpos.z, projection[2], r1
+	dp4 outpos.w, projection[3], r1
+
+ 	mov outtex, intex
+
+	end
+.end
+
diff --git a/backends/platform/3ds/sprite.cpp b/backends/platform/3ds/sprite.cpp
new file mode 100644
index 0000000000..d779fa40ff
--- /dev/null
+++ b/backends/platform/3ds/sprite.cpp
@@ -0,0 +1,144 @@
+/* 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_ALLOW_ALL
+#include "backends/platform/3ds/sprite.h"
+#include <algorithm>
+#include <3ds.h>
+
+static uint nextHigher2(uint v) {
+	if (v == 0)
+		return 1;
+	v--;
+	v |= v >> 1;
+	v |= v >> 2;
+	v |= v >> 4;
+	v |= v >> 8;
+	v |= v >> 16;
+	return ++v;
+}
+
+Sprite::Sprite()
+: dirtyPixels(true)
+, dirtyMatrix(true)
+, actualWidth(0)
+, actualHeight(0)
+, posX(0)
+, posY(0)
+, scaleX(1.f)
+, scaleY(1.f)
+{
+	Mtx_Identity(&modelview);
+
+	vertices = (vertex*)linearAlloc(sizeof(vertex) * 4);
+}
+
+Sprite::~Sprite() {
+	//
+}
+
+void Sprite::create(uint16 width, uint16 height, const Graphics::PixelFormat &f) {
+	free();
+	
+	actualWidth = width;
+	actualHeight = height;
+	format = f;
+	w = std::max(nextHigher2(width), 64u);
+	h = std::max(nextHigher2(height), 64u);;
+	pitch = w * format.bytesPerPixel;
+	dirtyPixels = true;
+
+	if (width && height) {
+		pixels = linearAlloc(h * pitch);
+		C3D_TexInit(&texture, w, h, GPU_RGBA8);
+		C3D_TexSetFilter(&texture, GPU_LINEAR, GPU_NEAREST);
+		assert(pixels && texture.data);
+		clear();
+	}
+	
+	float x = 0.f, y = 0.f;
+	float u = (float)width/w;
+	float v = (float)height/h;
+	vertex tmp[4] = {
+		{{x,       y,        0.5f}, {0, 0}},
+		{{x+width, y,        0.5f}, {u, 0}},
+		{{x,       y+height, 0.5f}, {0, v}},
+		{{x+width, y+height, 0.5f}, {u, v}},
+	};
+	memcpy(vertices, tmp, sizeof(vertex) * 4);
+}
+
+
+void Sprite::free() {
+	linearFree(vertices);
+	linearFree(pixels);
+	C3D_TexDelete(&texture);
+	pixels = 0;
+	w = h = pitch = 0;
+	actualWidth = actualHeight = 0;
+	format = Graphics::PixelFormat();
+}
+
+void Sprite::convertToInPlace(const Graphics::PixelFormat &dstFormat, const byte *palette) {
+	//
+}
+
+void Sprite::render() {
+	if (dirtyPixels) {
+		dirtyPixels = false;
+		GSPGPU_FlushDataCache(pixels, w * h * format.bytesPerPixel);
+		C3D_SafeDisplayTransfer((u32*)pixels, GX_BUFFER_DIM(w, h), (u32*)texture.data, GX_BUFFER_DIM(w, h), TEXTURE_TRANSFER_FLAGS);
+		gspWaitForPPF();
+	}
+	C3D_TexBind(0, &texture);
+
+	C3D_BufInfo* bufInfo = C3D_GetBufInfo();
+	BufInfo_Init(bufInfo);
+	BufInfo_Add(bufInfo, vertices, sizeof(vertex), 2, 0x10);
+	C3D_DrawArrays(GPU_TRIANGLE_STRIP, 0, 4);
+}
+
+void Sprite::clear(uint32 color) {
+	dirtyPixels = true;
+	memset(pixels, color, w * h * format.bytesPerPixel);
+}
+
+void Sprite::setScale (float x, float y) {
+	scaleX = x;
+	scaleY = y;
+	dirtyMatrix = true;
+}
+
+void Sprite::setPosition(int x, int y) {
+	posX = x;
+	posY = y;
+	dirtyMatrix = true;
+}
+
+C3D_Mtx* Sprite::getMatrix() {
+	if (dirtyMatrix) {
+		dirtyMatrix = false;
+		Mtx_Identity(&modelview);
+		Mtx_Scale(&modelview, scaleX, scaleY, 1.f);
+		Mtx_Translate(&modelview, posX, posY, 0);
+	}
+	return &modelview;
+}
diff --git a/backends/platform/3ds/sprite.h b/backends/platform/3ds/sprite.h
new file mode 100644
index 0000000000..6d88ae4ce1
--- /dev/null
+++ b/backends/platform/3ds/sprite.h
@@ -0,0 +1,71 @@
+/* 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 GRAPHICS_SPRITE_3DS_H
+#define GRAPHICS_SPRITE_3DS_H
+
+#include <citro3d.h>
+#include "graphics/surface.h"
+
+#define TEXTURE_TRANSFER_FLAGS \
+	(GX_TRANSFER_FLIP_VERT(1) | GX_TRANSFER_OUT_TILED(1) | GX_TRANSFER_RAW_COPY(0) | \
+	GX_TRANSFER_IN_FORMAT(GX_TRANSFER_FMT_RGBA8) | GX_TRANSFER_OUT_FORMAT(GX_TRANSFER_FMT_RGBA8) | \
+	GX_TRANSFER_SCALING(GX_TRANSFER_SCALE_NO))
+
+typedef struct {
+	float position[3];
+	float texcoord[2];
+} vertex;
+
+class Sprite : public Graphics::Surface {
+public:
+	Sprite();
+	~Sprite();
+	void create(uint16 width, uint16 height, const Graphics::PixelFormat &format);
+	void free();
+	void convertToInPlace(const Graphics::PixelFormat &dstFormat, const byte *palette = 0);
+	void render();
+	void clear(uint32 color = 0);
+	void markDirty(){ dirtyPixels = true; }
+	
+	void setPosition(int x, int y);
+	void setScale(float x, float y);
+	float getScaleX(){ return scaleX; }
+	float getScaleY(){ return scaleY; }
+	C3D_Mtx* getMatrix();
+	
+	uint16 actualWidth;
+	uint16 actualHeight;
+	
+private:
+	bool dirtyPixels;
+	bool dirtyMatrix;
+	C3D_Mtx modelview;
+	C3D_Tex texture;
+	vertex* vertices;
+	int posX;
+	int posY;
+	float scaleX;
+	float scaleY;
+};
+
+#endif