From 2a52e88b8d4f3c8c93f7e6779e0adee7ef804d1b Mon Sep 17 00:00:00 2001
From: Rodrigo Alfonso <rodri042@gmail.com>
Date: Thu, 25 Jan 2024 00:50:39 -0300
Subject: [PATCH] Adding LinkWirelessMultiboot_demo

---
 examples/LinkWirelessMultiboot_demo/Makefile  | 289 ++++++++++++++++++
 .../LinkWirelessMultiboot_demo/src/main.cpp   |  45 +++
 .../src/scenes/MultibootScene.cpp             | 209 +++++++++++++
 .../src/scenes/MultibootScene.h               |  35 +++
 .../src/utils/InputHandler.h                  |  39 +++
 .../src/utils/SceneUtils.h                    |  52 ++++
 examples/compile.sh                           |   5 +
 7 files changed, 674 insertions(+)
 create mode 100644 examples/LinkWirelessMultiboot_demo/Makefile
 create mode 100644 examples/LinkWirelessMultiboot_demo/src/main.cpp
 create mode 100644 examples/LinkWirelessMultiboot_demo/src/scenes/MultibootScene.cpp
 create mode 100644 examples/LinkWirelessMultiboot_demo/src/scenes/MultibootScene.h
 create mode 100644 examples/LinkWirelessMultiboot_demo/src/utils/InputHandler.h
 create mode 100644 examples/LinkWirelessMultiboot_demo/src/utils/SceneUtils.h

diff --git a/examples/LinkWirelessMultiboot_demo/Makefile b/examples/LinkWirelessMultiboot_demo/Makefile
new file mode 100644
index 0000000..9ad0b2f
--- /dev/null
+++ b/examples/LinkWirelessMultiboot_demo/Makefile
@@ -0,0 +1,289 @@
+# === SETUP ===========================================================
+
+# --- No implicit rules ---
+.SUFFIXES:
+
+# --- Paths ---
+export TONCLIB := $(DEVKITPRO)/libtonc
+
+# === TONC RULES ======================================================
+#
+# Yes, this is almost, but not quite, completely like to
+# DKP's base_rules and gba_rules
+#
+
+export PATH	:=	$(DEVKITARM)/bin:$(PATH)
+
+
+# --- Executable names ---
+
+PREFIX		?=	arm-none-eabi-
+
+export CC	:=	$(PREFIX)gcc
+export CXX	:=	$(PREFIX)g++
+export AS	:=	$(PREFIX)as
+export AR	:=	$(PREFIX)ar
+export NM	:=	$(PREFIX)nm
+export OBJCOPY	:=	$(PREFIX)objcopy
+
+# LD defined in Makefile
+
+
+# === LINK / TRANSLATE ================================================
+
+%.gba : %.elf
+	@$(OBJCOPY) -O binary $< $@
+	@echo built ... $(notdir $@)
+	@gbafix $@ -t$(TITLE)
+
+#----------------------------------------------------------------------
+
+%.mb.elf :
+	@echo Linking multiboot
+	$(LD) -specs=gba_mb.specs $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@
+	$(NM) -Sn $@ > $(basename $(notdir $@)).map
+
+#----------------------------------------------------------------------
+
+%.elf :
+	@echo Linking cartridge
+	$(LD) -specs=gba.specs $(LDFLAGS) $(OFILES) $(LIBPATHS) $(LIBS) -o $@
+	$(NM) -Sn $@ > $(basename $(notdir $@)).map
+
+#----------------------------------------------------------------------
+
+%.a :
+	@echo $(notdir $@)
+	@rm -f $@
+	$(AR) -crs $@ $^
+
+
+# === OBJECTIFY =======================================================
+
+%.iwram.o : %.iwram.cpp
+	@echo $(notdir $<)
+	$(CXX) -MMD -MP -MF $(DEPSDIR)/$*.d $(CXXFLAGS) $(IARCH) -c $< -o $@
+
+#----------------------------------------------------------------------
+%.iwram.o : %.iwram.c
+	@echo $(notdir $<)
+	$(CC) -MMD -MP -MF $(DEPSDIR)/$*.d $(CFLAGS) $(IARCH) -c $< -o $@
+
+#----------------------------------------------------------------------
+
+%.o : %.cpp
+	@echo $(notdir $<)
+	$(CXX) -MMD -MP -MF $(DEPSDIR)/$*.d $(CXXFLAGS) $(RARCH) -c $< -o $@
+
+#----------------------------------------------------------------------
+
+%.o : %.c
+	@echo $(notdir $<)
+	$(CC) -MMD -MP -MF $(DEPSDIR)/$*.d $(CFLAGS) $(RARCH) -c $< -o $@
+
+#----------------------------------------------------------------------
+
+%.o : %.s
+	@echo $(notdir $<)
+	$(CC) -MMD -MP -MF $(DEPSDIR)/$*.d -x assembler-with-cpp $(ASFLAGS) -c $< -o $@
+
+#----------------------------------------------------------------------
+
+%.o : %.S
+	@echo $(notdir $<)
+	$(CC) -MMD -MP -MF $(DEPSDIR)/$*.d -x assembler-with-cpp $(ASFLAGS) -c $< -o $@
+
+
+#----------------------------------------------------------------------
+# canned command sequence for binary data
+#----------------------------------------------------------------------
+
+define bin2o
+	bin2s $< | $(AS) -o $(@)
+	echo "extern const u8" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"_end[];" > `(echo $(<F) | tr . _)`.h
+	echo "extern const u8" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`"[];" >> `(echo $(<F) | tr . _)`.h
+	echo "extern const u32" `(echo $(<F) | sed -e 's/^\([0-9]\)/_\1/' | tr . _)`_size";" >> `(echo $(<F) | tr . _)`.h
+endef
+# =====================================================================
+
+# === PROJECT DETAILS =================================================
+# PROJ		: Base project name
+# TITLE		: Title for ROM header (12 characters)
+# LIBS		: Libraries to use, formatted as list for linker flags
+# BUILD		: Directory for build process temporaries. Should NOT be empty!
+# SRCDIRS	: List of source file directories
+# DATADIRS	: List of data file directories
+# INCDIRS	: List of header file directories
+# LIBDIRS	: List of library directories
+# General note: use `.' for the current dir, don't leave the lists empty.
+
+export PROJ	?= $(notdir $(CURDIR))
+TITLE		:= $(PROJ)
+
+LIBS		:= -ltonc -lugba -lgba-sprite-engine
+
+BUILD		:= build
+SRCDIRS		:= src ../_lib ../../lib \
+						 src/scenes \
+						 src/utils
+
+DATADIRS	:=
+INCDIRS		:= src
+LIBDIRS		:= $(TONCLIB) $(PWD)/../_lib/libugba $(PWD)/../_lib/libgba-sprite-engine
+
+# --- switches ---
+
+bMB		:= 0	# Multiboot build
+bTEMPS	:= 0	# Save gcc temporaries (.i and .S files)
+bDEBUG2	:= 0	# Generate debug info (bDEBUG2? Not a full DEBUG flag. Yet)
+
+# === BUILD FLAGS =====================================================
+# This is probably where you can stop editing
+# NOTE: I've noticed that -fgcse and -ftree-loop-optimize sometimes muck
+#	up things (gcse seems fond of building masks inside a loop instead of
+#	outside them for example). Removing them sometimes helps
+
+# --- Architecture ---
+
+ARCH    := -mthumb-interwork -mthumb
+RARCH   := -mthumb-interwork -mthumb
+IARCH   := -mthumb-interwork -marm -mlong-calls
+
+# --- Main flags ---
+
+CFLAGS		:= -mcpu=arm7tdmi -mtune=arm7tdmi -Ofast
+CFLAGS		+= -Wall
+CFLAGS		+= $(INCLUDE)
+CFLAGS		+= -ffast-math -fno-strict-aliasing
+
+CXXFLAGS	:= $(CFLAGS) -fno-rtti -fno-exceptions
+
+ASFLAGS		:= $(ARCH) $(INCLUDE)
+LDFLAGS 	:= $(ARCH) -Wl,-Map,$(PROJ).map
+
+# --- switched additions ----------------------------------------------
+
+# --- Multiboot ? ---
+ifeq ($(strip $(bMB)), 1)
+	TARGET	:= $(PROJ).mb
+else
+	TARGET	:= $(PROJ)
+endif
+
+# --- Save temporary files ? ---
+ifeq ($(strip $(bTEMPS)), 1)
+	CFLAGS		+= -save-temps
+	CXXFLAGS	+= -save-temps
+endif
+
+# --- Debug info ? ---
+
+ifeq ($(strip $(bDEBUG)), 1)
+	CFLAGS		+= -DDEBUG -g
+	CXXFLAGS	+= -DDEBUG -g
+	ASFLAGS		+= -DDEBUG -g
+	LDFLAGS		+= -g
+else
+	CFLAGS		+= -DNDEBUG
+	CXXFLAGS	+= -DNDEBUG
+	ASFLAGS		+= -DNDEBUG
+endif
+
+# --- Custom vars ? ---
+
+GAMETITLE=test-multi-link
+GAMEMAKER=AGB
+GAMECODE=AZCE # Megaman Zero (SRAM - 64kb)
+ENV ?= development
+
+ifeq ($(ENV), debug)
+	CXXFLAGS += -DENV_DEBUG=true -DENV_DEVELOPMENT=true
+else ifeq ($(ENV), development)
+	CXXFLAGS += -DENV_DEVELOPMENT=true
+else
+
+endif
+
+# CXXFLAGS += -DCUSTOM_VAR_DEFINE
+
+# === BUILD PROC ======================================================
+
+ifneq ($(BUILD),$(notdir $(CURDIR)))
+
+# Still in main dir:
+# * Define/export some extra variables
+# * Invoke this file again from the build dir
+# PONDER: what happens if BUILD == "" ?
+
+export OUTPUT	:=	$(CURDIR)/$(TARGET)
+export VPATH	:=									\
+	$(foreach dir, $(SRCDIRS) , $(CURDIR)/$(dir))	\
+	$(foreach dir, $(DATADIRS), $(CURDIR)/$(dir))
+
+export DEPSDIR	:=	$(CURDIR)/$(BUILD)
+
+# --- List source and data files ---
+
+CFILES		:=	$(foreach dir, $(SRCDIRS) , $(notdir $(wildcard $(dir)/*.c)))
+CPPFILES	:=	$(foreach dir, $(SRCDIRS) , $(notdir $(wildcard $(dir)/*.cpp)))
+SFILES		:=	$(foreach dir, $(SRCDIRS) , $(notdir $(wildcard $(dir)/*.S)))
+BINFILES	:=	$(foreach dir, $(DATADIRS), $(notdir $(wildcard $(dir)/*.*)))
+
+# --- Set linker depending on C++ file existence ---
+ifeq ($(strip $(CPPFILES)),)
+	export LD	:= $(CC)
+else
+	export LD	:= $(CXX)
+endif
+
+# --- Define object file list ---
+export OFILES	:=	$(addsuffix .o, $(BINFILES))					\
+					$(CFILES:.c=.o) $(CPPFILES:.cpp=.o)				\
+					$(SFILES:.S=.o)
+
+# --- Create include and library search paths ---
+export INCLUDE	:=	$(foreach dir,$(INCDIRS),-I$(CURDIR)/$(dir))	\
+					$(foreach dir,$(LIBDIRS),-I$(dir)/include)		\
+					-I$(CURDIR)/$(BUILD)
+
+export LIBPATHS	:=	-L$(CURDIR) $(foreach dir,$(LIBDIRS),-L$(dir)/lib)
+
+# --- Create BUILD if necessary, and run this makefile from there ---
+
+$(BUILD):
+	@[ -d $@ ] || mkdir -p $@
+	@make --no-print-directory -C $(BUILD) -f $(CURDIR)/Makefile
+	arm-none-eabi-nm -Sn $(OUTPUT).elf > $(BUILD)/$(TARGET).map
+
+all	: $(BUILD)
+
+clean:
+	@echo clean ...
+	@rm -rf $(BUILD) $(TARGET).elf $(TARGET).gba $(TARGET).sav
+
+else		# If we're here, we should be in the BUILD dir
+
+DEPENDS	:= $(OFILES:.o=.d)
+
+# --- Main targets ----
+
+$(OUTPUT).gba	:	$(OUTPUT).elf
+
+$(OUTPUT).elf	:	$(OFILES)
+
+-include $(DEPENDS)
+
+endif		# End BUILD switch
+
+# --- More targets ----------------------------------------------------
+
+.PHONY: clean rebuild start
+
+rebuild: clean $(BUILD)
+
+start:
+	start "$(TARGET).gba"
+
+restart: rebuild start
+
+# EOF
diff --git a/examples/LinkWirelessMultiboot_demo/src/main.cpp b/examples/LinkWirelessMultiboot_demo/src/main.cpp
new file mode 100644
index 0000000..d5418d0
--- /dev/null
+++ b/examples/LinkWirelessMultiboot_demo/src/main.cpp
@@ -0,0 +1,45 @@
+#include <libgba-sprite-engine/gba_engine.h>
+#include <tonc.h>
+#include "../../../lib/LinkRawWireless.hpp"
+#include "../../_lib/interrupt.h"
+#include "scenes/MultibootScene.h"
+#include "utils/SceneUtils.h"
+
+void setUpInterrupts();
+void printTutorial();
+static std::shared_ptr<GBAEngine> engine{new GBAEngine()};
+static std::unique_ptr<MultibootScene> multibootScene{
+    new MultibootScene(engine)};
+
+LinkRawWireless* linkRawWireless = new LinkRawWireless();
+
+int main() {
+  setUpInterrupts();
+
+  engine->setScene(multibootScene.get());
+
+  while (true) {
+    engine->update();
+
+    VBlankIntrWait();
+  }
+
+  return 0;
+}
+
+inline void ISR_reset() {
+  RegisterRamReset(RESET_REG | RESET_VRAM);
+  SoftReset();
+}
+
+inline void setUpInterrupts() {
+  interrupt_init();
+
+  interrupt_set_handler(INTR_VBLANK, [] {});
+  interrupt_enable(INTR_VBLANK);
+
+  // A+B+START+SELECT
+  REG_KEYCNT = 0b1100000000001111;
+  interrupt_set_handler(INTR_KEYPAD, ISR_reset);
+  interrupt_enable(INTR_KEYPAD);
+}
diff --git a/examples/LinkWirelessMultiboot_demo/src/scenes/MultibootScene.cpp b/examples/LinkWirelessMultiboot_demo/src/scenes/MultibootScene.cpp
new file mode 100644
index 0000000..cccda8c
--- /dev/null
+++ b/examples/LinkWirelessMultiboot_demo/src/scenes/MultibootScene.cpp
@@ -0,0 +1,209 @@
+#include "MultibootScene.h"
+
+#include <libgba-sprite-engine/background/text_stream.h>
+#include <tonc.h>
+#include <algorithm>
+#include <functional>
+
+#include "../../../../lib/LinkRawWireless.hpp"
+#include "utils/InputHandler.h"
+#include "utils/SceneUtils.h"
+
+MultibootScene::MultibootScene(std::shared_ptr<GBAEngine> engine)
+    : Scene(engine) {}
+
+static std::unique_ptr<InputHandler> aHandler =
+    std::unique_ptr<InputHandler>(new InputHandler());
+static std::unique_ptr<InputHandler> bHandler =
+    std::unique_ptr<InputHandler>(new InputHandler());
+static std::unique_ptr<InputHandler> upHandler =
+    std::unique_ptr<InputHandler>(new InputHandler());
+static std::unique_ptr<InputHandler> downHandler =
+    std::unique_ptr<InputHandler>(new InputHandler());
+static std::unique_ptr<InputHandler> lHandler =
+    std::unique_ptr<InputHandler>(new InputHandler());
+static std::unique_ptr<InputHandler> rHandler =
+    std::unique_ptr<InputHandler>(new InputHandler());
+static std::unique_ptr<InputHandler> selectHandler =
+    std::unique_ptr<InputHandler>(new InputHandler());
+
+static std::vector<std::string> logLines;
+static u32 currentLogLine = 0;
+static bool useVerboseLog = true;
+
+#define MAX_LINES 20
+#define DRAW_LINE 0
+
+void printScrollableText(u32 currentLine,
+                         std::vector<std::string> lines,
+                         bool withCursor = false) {
+  for (u32 i = 0; i < MAX_LINES; i++) {
+    u32 lastLineIndex = MAX_LINES - 1;
+    u32 index = max(currentLine, lastLineIndex) - lastLineIndex + i;
+    if (index < lines.size()) {
+      std::string cursor = currentLine == index ? "> " : "  ";
+      TextStream::instance().setText((withCursor ? cursor : "") + lines[index],
+                                     DRAW_LINE + i, -3);
+    } else {
+      TextStream::instance().setText("                              ",
+                                     DRAW_LINE + i, -3);
+    }
+  }
+}
+
+void print() {
+  printScrollableText(currentLogLine, logLines);
+}
+
+void scrollBack() {
+  if (currentLogLine <= 0)
+    return;
+  currentLogLine--;
+  print();
+}
+
+void scrollForward() {
+  if (currentLogLine < MAX_LINES - 1)
+    currentLogLine = min(MAX_LINES - 1, logLines.size() - 1);
+  if (currentLogLine == logLines.size() - 1)
+    return;
+  currentLogLine++;
+  print();
+}
+
+void scrollPageUp() {
+  currentLogLine = max(currentLogLine - MAX_LINES, 0);
+  print();
+}
+
+void scrollPageDown() {
+  currentLogLine = min(currentLogLine + MAX_LINES, logLines.size() - 1);
+  print();
+}
+
+void scrollToTop() {
+  currentLogLine = 0;
+  print();
+}
+
+void scrollToBottom() {
+  currentLogLine = logLines.size() - 1;
+  print();
+}
+
+void clear() {
+  logLines.clear();
+  currentLogLine = 0;
+  print();
+}
+
+void log(std::string string) {
+  logLines.push_back(string);
+  scrollPageDown();
+}
+
+std::vector<Background*> MultibootScene::backgrounds() {
+  return {};
+}
+
+std::vector<Sprite*> MultibootScene::sprites() {
+  std::vector<Sprite*> sprites;
+  return sprites;
+}
+
+void MultibootScene::load() {
+  SCENE_init();
+  BACKGROUND_enable(true, false, false, false);
+
+  linkRawWireless->logger = [](std::string string) {
+    if (useVerboseLog)
+      log(string);
+  };
+
+  log("---");
+  log("LinkWirelessMultiboot demo");
+  log("");
+  log("A: send ROM");
+  log("B: toggle log level");
+  log("UP/DOWN: scroll up/down");
+  log("L/R: scroll page up/down");
+  log("UP+L/DOWN+R: scroll to top/bottom");
+  log("SELECT: clear");
+  log("---");
+  log("");
+  toggleLogLevel();
+}
+
+void MultibootScene::tick(u16 keys) {
+  if (engine->isTransitioning())
+    return;
+
+  processKeys(keys);
+  processButtons();
+
+  __qran_seed += keys;
+  __qran_seed += REG_RCNT;
+  __qran_seed += REG_SIOCNT;
+}
+
+void MultibootScene::processKeys(u16 keys) {
+  aHandler->setIsPressed(keys & KEY_A);
+  bHandler->setIsPressed(keys & KEY_B);
+  upHandler->setIsPressed(keys & KEY_UP);
+  downHandler->setIsPressed(keys & KEY_DOWN);
+  lHandler->setIsPressed(keys & KEY_L);
+  rHandler->setIsPressed(keys & KEY_R);
+  selectHandler->setIsPressed(keys & KEY_SELECT);
+}
+
+void MultibootScene::processButtons() {
+  if (bHandler->hasBeenPressedNow())
+    toggleLogLevel();
+
+  if (aHandler->hasBeenPressedNow()) {
+    // TODO: IMPLEMENT
+    print();
+  }
+
+  if (lHandler->hasBeenPressedNow()) {
+    if (upHandler->getIsPressed())
+      scrollToTop();
+    else
+      scrollPageUp();
+  }
+
+  if (rHandler->hasBeenPressedNow()) {
+    if (downHandler->getIsPressed())
+      scrollToBottom();
+    else
+      scrollPageDown();
+  }
+
+  if (upHandler->getIsPressed())
+    scrollBack();
+
+  if (downHandler->getIsPressed())
+    scrollForward();
+
+  if (selectHandler->hasBeenPressedNow())
+    clear();
+}
+
+void MultibootScene::toggleLogLevel() {
+  if (useVerboseLog) {
+    useVerboseLog = false;
+    log("! setting log level to NORMAL");
+  } else {
+    useVerboseLog = true;
+    log("! setting log level to VERBOSE");
+  }
+  log("");
+}
+
+void MultibootScene::logOperation(std::string name,
+                                  std::function<bool()> operation) {
+  log("> " + name + "...");
+  bool success = operation();
+  log(success ? "< success :)" : "< failure :(");
+  log("");
+}
diff --git a/examples/LinkWirelessMultiboot_demo/src/scenes/MultibootScene.h b/examples/LinkWirelessMultiboot_demo/src/scenes/MultibootScene.h
new file mode 100644
index 0000000..0c0cca4
--- /dev/null
+++ b/examples/LinkWirelessMultiboot_demo/src/scenes/MultibootScene.h
@@ -0,0 +1,35 @@
+#ifndef MULTIBOOT_SCENE_H
+#define MULTIBOOT_SCENE_H
+
+#include <libgba-sprite-engine/background/background.h>
+#include <libgba-sprite-engine/gba_engine.h>
+#include <libgba-sprite-engine/scene.h>
+#include <libgba-sprite-engine/sprites/sprite.h>
+
+#include <string>
+#include <vector>
+
+class MultibootScene : public Scene {
+ public:
+  MultibootScene(std::shared_ptr<GBAEngine> engine);
+
+  std::vector<Background*> backgrounds() override;
+  std::vector<Sprite*> sprites() override;
+
+  void load() override;
+  void tick(u16 keys) override;
+
+ private:
+  struct CommandMenuOption {
+    std::string name;
+    u8 command;
+  };
+  int lastSelectedCommandIndex = 0;
+
+  void processKeys(u16 keys);
+  void processButtons();
+  void toggleLogLevel();
+  void logOperation(std::string name, std::function<bool()> operation);
+};
+
+#endif  // MULTIBOOT_SCENE_H
diff --git a/examples/LinkWirelessMultiboot_demo/src/utils/InputHandler.h b/examples/LinkWirelessMultiboot_demo/src/utils/InputHandler.h
new file mode 100644
index 0000000..163e02e
--- /dev/null
+++ b/examples/LinkWirelessMultiboot_demo/src/utils/InputHandler.h
@@ -0,0 +1,39 @@
+#ifndef INPUT_HANDLER_H
+#define INPUT_HANDLER_H
+
+#include <libgba-sprite-engine/gba_engine.h>
+
+class InputHandler {
+ public:
+  InputHandler() {
+    this->isPressed = false;
+    this->isWaiting = true;
+  }
+
+  inline bool getIsPressed() { return isPressed; }
+
+  inline bool hasBeenPressedNow() { return isNewPressEvent; }
+  inline bool hasBeenReleasedNow() { return isNewReleaseEvent; }
+
+  inline bool getHandledFlag() { return handledFlag; }
+  inline void setHandledFlag(bool value) { handledFlag = value; }
+
+  inline void setIsPressed(bool isPressed) {
+    bool isNewPressEvent = !this->isWaiting && !this->isPressed && isPressed;
+    bool isNewReleaseEvent = !this->isWaiting && this->isPressed && !isPressed;
+    this->isPressed = isPressed;
+    this->isWaiting = this->isWaiting && isPressed;
+
+    this->isNewPressEvent = isNewPressEvent;
+    this->isNewReleaseEvent = isNewReleaseEvent;
+  }
+
+ protected:
+  bool isPressed = false;
+  bool isNewPressEvent = false;
+  bool isNewReleaseEvent = false;
+  bool handledFlag = false;
+  bool isWaiting = false;
+};
+
+#endif  // INPUT_HANDLER_H
\ No newline at end of file
diff --git a/examples/LinkWirelessMultiboot_demo/src/utils/SceneUtils.h b/examples/LinkWirelessMultiboot_demo/src/utils/SceneUtils.h
new file mode 100644
index 0000000..32258be
--- /dev/null
+++ b/examples/LinkWirelessMultiboot_demo/src/utils/SceneUtils.h
@@ -0,0 +1,52 @@
+#ifndef SCENE_UTILS_H
+#define SCENE_UTILS_H
+
+#include <libgba-sprite-engine/background/text_stream.h>
+#include <tonc_memdef.h>
+#include <tonc_memmap.h>
+#include <string>
+
+const u32 TEXT_MIDDLE_COL = 12;
+
+inline std::string asStr(u16 data) {
+  return std::to_string(data);
+}
+
+inline void BACKGROUND_enable(bool bg0, bool bg1, bool bg2, bool bg3) {
+  REG_DISPCNT = bg0 ? REG_DISPCNT | DCNT_BG0 : REG_DISPCNT & ~DCNT_BG0;
+  REG_DISPCNT = bg1 ? REG_DISPCNT | DCNT_BG1 : REG_DISPCNT & ~DCNT_BG1;
+  REG_DISPCNT = bg2 ? REG_DISPCNT | DCNT_BG2 : REG_DISPCNT & ~DCNT_BG2;
+  REG_DISPCNT = bg3 ? REG_DISPCNT | DCNT_BG3 : REG_DISPCNT & ~DCNT_BG3;
+}
+
+inline void SPRITE_disable() {
+  REG_DISPCNT = REG_DISPCNT & ~DCNT_OBJ;
+}
+
+inline void SCENE_init() {
+  TextStream::instance().clear();
+  TextStream::instance().scroll(0, 0);
+  TextStream::instance().setMosaic(false);
+
+  BACKGROUND_enable(false, false, false, false);
+  SPRITE_disable();
+}
+
+inline void SCENE_write(std::string text, u32 row) {
+  TextStream::instance().setText(text, row,
+                                 TEXT_MIDDLE_COL - text.length() / 2);
+}
+
+inline void SCENE_wait(u32 verticalLines) {
+  u32 count = 0;
+  u32 vCount = REG_VCOUNT;
+
+  while (count < verticalLines) {
+    if (REG_VCOUNT != vCount) {
+      count++;
+      vCount = REG_VCOUNT;
+    }
+  };
+}
+
+#endif  // SCENE_UTILS_H
diff --git a/examples/compile.sh b/examples/compile.sh
index 1877194..5e541b4 100644
--- a/examples/compile.sh
+++ b/examples/compile.sh
@@ -86,3 +86,8 @@ mv backup.gba LinkWireless_demo.gba
 sed -i -e "s/#define LINK_WIRELESS_PUT_ISR_IN_IWRAM/\/\/ #define LINK_WIRELESS_PUT_ISR_IN_IWRAM/g" ../../lib/LinkWireless.hpp
 sed -i -e "s/#define PROFILING_ENABLED/\/\/ #define PROFILING_ENABLED/g" ../../lib/LinkWireless.hpp
 cd ..
+
+cd LinkWirelessMultiboot_demo/
+make rebuild
+cp LinkWirelessMultiboot_demo.gba ../
+cd ..