diff --git a/chapter2/README.md b/chapter2/README.md
new file mode 100644
index 0000000..9be265b
--- /dev/null
+++ b/chapter2/README.md
@@ -0,0 +1,23 @@
+# Chapter2
+
+## 前提条件
+
+`Homebrew` などで SDL2 をインストール
+
+```
+brew install sdl2 sdl2_image
+```
+
+## ビルド・実行
+
+Assets ディレクトリに [画像ファイル](https://github.com/gameprogcpp/code/tree/master/Chapter02/Assets)を用意
+
+```
+./gradlew assemble
+./gradlew runDebugExecutableChapter2
+```
+
+と gradle を実行
+
+## 実行結果
+![](chapter2.png)
\ No newline at end of file
diff --git a/chapter2/build.gradle.kts b/chapter2/build.gradle.kts
new file mode 100644
index 0000000..c059ef0
--- /dev/null
+++ b/chapter2/build.gradle.kts
@@ -0,0 +1,63 @@
+plugins {
+    kotlin("multiplatform") version "1.5.10"
+}
+
+repositories {
+    mavenCentral()
+}
+
+kotlin {
+    macosX64("chapter2") { // on macOS
+        // linuxX64("native") // on Linux
+        // mingwX64("native") // on Windows
+        compilations["main"].cinterops {
+            val sdl by creating {
+                if (file("/usr/local/include/SDL").exists()) {
+                    includeDirs("/usr/local/include/SDL")
+                } else {
+                    includeDirs("/usr/local/include/SDL2")
+                }
+                includeDirs.headerFilterOnly("/usr/local/include")
+            }
+        }
+        compilations["main"].enableEndorsedLibs = true
+        binaries {
+            executable {
+                entryPoint = "chapter2.main"
+
+                val distTaskName = linkTaskName.replaceFirst("link", "dist")
+                val distTask = tasks.register<Copy>(distTaskName) {
+                    from("src/chapter2Main/resources")
+                    into(linkTask.outputFile.get().parentFile)
+                    dependsOn(linkTask)
+                }
+                tasks["assemble"].dependsOn(distTask)
+
+                runTask?.workingDir(project.provider { outputDirectory })
+            }
+        }
+    }
+    sourceSets {
+        commonMain {
+            dependencies {
+                implementation("org.jetbrains.kotlinx:kotlinx-cli:0.3.2")
+            }
+        }
+    }
+}
+
+buildscript {
+    dependencies {
+        classpath("org.jlleitschuh.gradle:ktlint-gradle:10.1.0")
+    }
+}
+
+tasks.withType<Wrapper> {
+    gradleVersion = "6.7.1"
+    distributionType = Wrapper.DistributionType.BIN
+}
+
+apply {
+    plugin("org.jlleitschuh.gradle.ktlint")
+    from("ktlint.gradle.kt")
+}
diff --git a/chapter2/chapter2.png b/chapter2/chapter2.png
new file mode 100644
index 0000000..b790ebf
Binary files /dev/null and b/chapter2/chapter2.png differ
diff --git a/chapter2/gradle.properties b/chapter2/gradle.properties
new file mode 100644
index 0000000..5dade1f
--- /dev/null
+++ b/chapter2/gradle.properties
@@ -0,0 +1,50 @@
+#
+# Copyright 2010-2019 JetBrains s.r.o.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# A version of the Kotlin compiler that is used to build Kotlin/Native.
+buildKotlinVersion=1.5.0-RC-556
+buildKotlinCompilerRepo=https://cache-redirector.jetbrains.com/maven.pkg.jetbrains.space/kotlin/p/kotlin/bootstrap
+remoteRoot=konan_tests
+kotlinCompilerRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_KotlinPublic_Compiler),number:1.5.10-871,branch:default:any,pinned:true/artifacts/content/maven
+kotlinVersion=1.5.10-871
+kotlinStdlibRepo=https://teamcity.jetbrains.com/guestAuth/app/rest/builds/buildType:(id:Kotlin_KotlinPublic_Compiler),number:1.5.10-871,branch:default:any,pinned:true/artifacts/content/maven
+kotlinStdlibVersion=1.5.10-871
+kotlinStdlibTestsVersion=1.5.10-871
+testKotlinCompilerVersion=1.5.10-871
+konanVersion=1.5.10
+
+# A version of Xcode required to build the Kotlin/Native compiler.
+xcodeMajorVersion=12
+
+# A GTest revision used to test the runtime.
+# The latest release GTest (1.10.0) doesn't properly register skipped tests in an XML-report.
+# Therefore we use a fixed commit form the master branch where this problem is already fixed.
+# https://github.com/google/googletest/commit/07f4869221012b16b7f9ee685d94856e1fc9f361
+gtestRevision=07f4869221012b16b7f9ee685d94856e1fc9f361
+
+org.gradle.jvmargs='-Dfile.encoding=UTF-8'
+org.gradle.workers.max=4
+slackApiVersion=1.2.0
+ktorVersion=1.2.1
+shadowVersion=5.1.0
+metadataVersion=0.0.1-dev-10
+
+# Uncomment to compile Kotlin/Native backend modules with JVM IR backend.
+# kotlin.build.useIR=true
+
+# Uncomment to enable composite build
+#kotlinProjectPath=<insert the path to Kotlin project root here>
+kotlin.native.cacheKind.macosX64=none
\ No newline at end of file
diff --git a/chapter2/gradle/kotlinGradlePlugin.gradle b/chapter2/gradle/kotlinGradlePlugin.gradle
new file mode 100644
index 0000000..2a53ac3
--- /dev/null
+++ b/chapter2/gradle/kotlinGradlePlugin.gradle
@@ -0,0 +1,37 @@
+def properties = ['buildKotlinVersion', 'buildKotlinCompilerRepo', 'kotlinVersion', 'kotlinCompilerRepo']
+
+for (prop in properties) {
+    if (!hasProperty(prop)) {
+        throw new GradleException("Please ensure the '$prop' property is defined before applying this script.")
+    }
+}
+
+project.buildscript.repositories {
+    maven {
+        url buildKotlinCompilerRepo
+    }
+    maven {
+        url kotlinCompilerRepo
+    }
+    maven {
+        url 'https://cache-redirector.jetbrains.com/maven-central'
+    }
+    mavenCentral()
+}
+
+project.buildscript.dependencies {
+    classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlinVersion"
+}
+configurations {
+    kotlinCompilerClasspath
+}
+project.repositories {
+    maven { url buildKotlinCompilerRepo }
+    maven {
+        url kotlinCompilerRepo
+    }
+}
+
+project.dependencies {
+    kotlinCompilerClasspath("org.jetbrains.kotlin:kotlin-compiler-embeddable:$buildKotlinVersion")
+}
diff --git a/chapter2/gradle/loadRootProperties.gradle b/chapter2/gradle/loadRootProperties.gradle
new file mode 100644
index 0000000..25edb22
--- /dev/null
+++ b/chapter2/gradle/loadRootProperties.gradle
@@ -0,0 +1,16 @@
+if (!project.hasProperty("rootBuildDirectory")) {
+    throw new GradleException('Please ensure the "rootBuildDirectory" property is defined before applying this script.')
+}
+
+ext.distDir = file("$rootBuildDirectory/dist")
+
+def rootProperties = new Properties()
+def rootDir = file(rootBuildDirectory).absolutePath
+file("$rootDir/gradle.properties").withReader {
+    rootProperties.load(it)
+}
+rootProperties.each { k, v ->
+    if (!project.hasProperty(k)) {
+        ext.set(k, v)
+    }
+}
diff --git a/chapter2/gradle/wrapper/gradle-wrapper.jar b/chapter2/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..e708b1c
Binary files /dev/null and b/chapter2/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/chapter2/gradle/wrapper/gradle-wrapper.properties b/chapter2/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..14e30f7
--- /dev/null
+++ b/chapter2/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,5 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.7-all.zip
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/chapter2/gradlew b/chapter2/gradlew
new file mode 100755
index 0000000..4f906e0
--- /dev/null
+++ b/chapter2/gradlew
@@ -0,0 +1,185 @@
+#!/usr/bin/env sh
+
+#
+# Copyright 2015 the original author or authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+##
+##  Gradle start up script for UN*X
+##
+##############################################################################
+
+# Attempt to set APP_HOME
+# Resolve links: $0 may be a link
+PRG="$0"
+# Need this for relative symlinks.
+while [ -h "$PRG" ] ; do
+    ls=`ls -ld "$PRG"`
+    link=`expr "$ls" : '.*-> \(.*\)$'`
+    if expr "$link" : '/.*' > /dev/null; then
+        PRG="$link"
+    else
+        PRG=`dirname "$PRG"`"/$link"
+    fi
+done
+SAVED="`pwd`"
+cd "`dirname \"$PRG\"`/" >/dev/null
+APP_HOME="`pwd -P`"
+cd "$SAVED" >/dev/null
+
+APP_NAME="Gradle"
+APP_BASE_NAME=`basename "$0"`
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD="maximum"
+
+warn () {
+    echo "$*"
+}
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+}
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "`uname`" in
+  CYGWIN* )
+    cygwin=true
+    ;;
+  Darwin* )
+    darwin=true
+    ;;
+  MINGW* )
+    msys=true
+    ;;
+  NONSTOP* )
+    nonstop=true
+    ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD="$JAVA_HOME/jre/sh/java"
+    else
+        JAVACMD="$JAVA_HOME/bin/java"
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD="java"
+    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+fi
+
+# Increase the maximum file descriptors if we can.
+if [ "$cygwin" = "false" -a "$darwin" = "false" -a "$nonstop" = "false" ] ; then
+    MAX_FD_LIMIT=`ulimit -H -n`
+    if [ $? -eq 0 ] ; then
+        if [ "$MAX_FD" = "maximum" -o "$MAX_FD" = "max" ] ; then
+            MAX_FD="$MAX_FD_LIMIT"
+        fi
+        ulimit -n $MAX_FD
+        if [ $? -ne 0 ] ; then
+            warn "Could not set maximum file descriptor limit: $MAX_FD"
+        fi
+    else
+        warn "Could not query maximum file descriptor limit: $MAX_FD_LIMIT"
+    fi
+fi
+
+# For Darwin, add options to specify how the application appears in the dock
+if $darwin; then
+    GRADLE_OPTS="$GRADLE_OPTS \"-Xdock:name=$APP_NAME\" \"-Xdock:icon=$APP_HOME/media/gradle.icns\""
+fi
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if [ "$cygwin" = "true" -o "$msys" = "true" ] ; then
+    APP_HOME=`cygpath --path --mixed "$APP_HOME"`
+    CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
+
+    JAVACMD=`cygpath --unix "$JAVACMD"`
+
+    # We build the pattern for arguments to be converted via cygpath
+    ROOTDIRSRAW=`find -L / -maxdepth 1 -mindepth 1 -type d 2>/dev/null`
+    SEP=""
+    for dir in $ROOTDIRSRAW ; do
+        ROOTDIRS="$ROOTDIRS$SEP$dir"
+        SEP="|"
+    done
+    OURCYGPATTERN="(^($ROOTDIRS))"
+    # Add a user-defined pattern to the cygpath arguments
+    if [ "$GRADLE_CYGPATTERN" != "" ] ; then
+        OURCYGPATTERN="$OURCYGPATTERN|($GRADLE_CYGPATTERN)"
+    fi
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    i=0
+    for arg in "$@" ; do
+        CHECK=`echo "$arg"|egrep -c "$OURCYGPATTERN" -`
+        CHECK2=`echo "$arg"|egrep -c "^-"`                                 ### Determine if an option
+
+        if [ $CHECK -ne 0 ] && [ $CHECK2 -eq 0 ] ; then                    ### Added a condition
+            eval `echo args$i`=`cygpath --path --ignore --mixed "$arg"`
+        else
+            eval `echo args$i`="\"$arg\""
+        fi
+        i=`expr $i + 1`
+    done
+    case $i in
+        0) set -- ;;
+        1) set -- "$args0" ;;
+        2) set -- "$args0" "$args1" ;;
+        3) set -- "$args0" "$args1" "$args2" ;;
+        4) set -- "$args0" "$args1" "$args2" "$args3" ;;
+        5) set -- "$args0" "$args1" "$args2" "$args3" "$args4" ;;
+        6) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" ;;
+        7) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" ;;
+        8) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" ;;
+        9) set -- "$args0" "$args1" "$args2" "$args3" "$args4" "$args5" "$args6" "$args7" "$args8" ;;
+    esac
+fi
+
+# Escape application args
+save () {
+    for i do printf %s\\n "$i" | sed "s/'/'\\\\''/g;1s/^/'/;\$s/\$/' \\\\/" ; done
+    echo " "
+}
+APP_ARGS=`save "$@"`
+
+# Collect all arguments for the java command, following the shell quoting and substitution rules
+eval set -- $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS "\"-Dorg.gradle.appname=$APP_BASE_NAME\"" -classpath "\"$CLASSPATH\"" org.gradle.wrapper.GradleWrapperMain "$APP_ARGS"
+
+exec "$JAVACMD" "$@"
diff --git a/chapter2/gradlew.bat b/chapter2/gradlew.bat
new file mode 100644
index 0000000..ac1b06f
--- /dev/null
+++ b/chapter2/gradlew.bat
@@ -0,0 +1,89 @@
+@rem
+@rem Copyright 2015 the original author or authors.
+@rem
+@rem Licensed under the Apache License, Version 2.0 (the "License");
+@rem you may not use this file except in compliance with the License.
+@rem You may obtain a copy of the License at
+@rem
+@rem      https://www.apache.org/licenses/LICENSE-2.0
+@rem
+@rem Unless required by applicable law or agreed to in writing, software
+@rem distributed under the License is distributed on an "AS IS" BASIS,
+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+@rem See the License for the specific language governing permissions and
+@rem limitations under the License.
+@rem
+
+@if "%DEBUG%" == "" @echo off
+@rem ##########################################################################
+@rem
+@rem  Gradle startup script for Windows
+@rem
+@rem ##########################################################################
+
+@rem Set local scope for the variables with windows NT shell
+if "%OS%"=="Windows_NT" setlocal
+
+set DIRNAME=%~dp0
+if "%DIRNAME%" == "" set DIRNAME=.
+set APP_BASE_NAME=%~n0
+set APP_HOME=%DIRNAME%
+
+@rem Resolve any "." and ".." in APP_HOME to make it shorter.
+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi
+
+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
+
+@rem Find java.exe
+if defined JAVA_HOME goto findJavaFromJavaHome
+
+set JAVA_EXE=java.exe
+%JAVA_EXE% -version >NUL 2>&1
+if "%ERRORLEVEL%" == "0" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:findJavaFromJavaHome
+set JAVA_HOME=%JAVA_HOME:"=%
+set JAVA_EXE=%JAVA_HOME%/bin/java.exe
+
+if exist "%JAVA_EXE%" goto execute
+
+echo.
+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%
+echo.
+echo Please set the JAVA_HOME variable in your environment to match the
+echo location of your Java installation.
+
+goto fail
+
+:execute
+@rem Setup the command line
+
+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar
+
+
+@rem Execute Gradle
+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*
+
+:end
+@rem End local scope for the variables with windows NT shell
+if "%ERRORLEVEL%"=="0" goto mainEnd
+
+:fail
+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of
+rem the _cmd.exe /c_ return code!
+if  not "" == "%GRADLE_EXIT_CONSOLE%" exit 1
+exit /b 1
+
+:mainEnd
+if "%OS%"=="Windows_NT" endlocal
+
+:omega
diff --git a/chapter2/ktlint.gradle.kt b/chapter2/ktlint.gradle.kt
new file mode 100644
index 0000000..c00b5ca
--- /dev/null
+++ b/chapter2/ktlint.gradle.kt
@@ -0,0 +1,3 @@
+ktlint {
+    disabledRules = ["no-wildcard-imports"]
+}
\ No newline at end of file
diff --git a/chapter2/settings.gradle.kts b/chapter2/settings.gradle.kts
new file mode 100644
index 0000000..e69de29
diff --git a/chapter2/src/chapter2Main/kotlin/Actor.kt b/chapter2/src/chapter2Main/kotlin/Actor.kt
new file mode 100644
index 0000000..e3739c2
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/Actor.kt
@@ -0,0 +1,54 @@
+package chapter2
+
+import kotlin.collections.*
+
+open class Actor(val game: Game) {
+
+    enum class State {
+        Active,
+        Paused,
+        Dead
+    }
+
+    var position: Vector2 = Vector2.zero
+    var scale: Float = 1.0f
+    var rotation: Float = 0.0f
+    var state: State = State.Active
+    private var components = mutableListOf<Component>()
+
+    init {
+        game.addActor(this)
+    }
+
+    fun update(deltaTime: Float) {
+        if (state == State.Active) {
+            updateComponents(deltaTime)
+            updateActor(deltaTime)
+        }
+    }
+
+    private fun updateComponents(deltaTime: Float) {
+        for (component in components) {
+            component.update(deltaTime)
+        }
+    }
+
+    open fun updateActor(deltaTime: Float) {
+    }
+
+    fun addComponent(component: Component) {
+        components.add(component)
+        components.sortBy { it.updateOrder }
+    }
+
+    fun removeComponent(component: Component) {
+        components.remove(component)
+    }
+
+    fun dispose() {
+        game.removeActor(this)
+        for (component in components) {
+            component.dispose()
+        }
+    }
+}
diff --git a/chapter2/src/chapter2Main/kotlin/AnimSpriteComponent.kt b/chapter2/src/chapter2Main/kotlin/AnimSpriteComponent.kt
new file mode 100644
index 0000000..d7e8cfb
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/AnimSpriteComponent.kt
@@ -0,0 +1,38 @@
+package chapter2
+
+import kotlinx.cinterop.*
+import sdl.*
+
+class AnimSpriteComponent(owner: Actor, drawOrder: Int = 100) : SpriteComponent(owner, drawOrder) {
+
+    private var animationTextures: List<CPointer<SDL_Texture>?> = listOf()
+    private var currentFrame = 0.0f
+    private var animationFps = 2.4f
+
+    override fun update(deltaTime: Float) {
+        super.update(deltaTime)
+
+        if (animationTextures.isNotEmpty()) {
+            // Update the current frame based on frame rate
+            // and delta time
+            currentFrame += animationFps * deltaTime
+
+            // Wrap current frame if needed
+            while (currentFrame >= animationTextures.size) {
+                currentFrame -= animationTextures.size
+            }
+
+            // Set the current texture
+            setTexture(animationTextures[currentFrame.toInt()])
+        }
+    }
+
+    fun setAnimationTextures(textures: List<CPointer<SDL_Texture>?>) {
+        animationTextures = textures
+
+        if (animationTextures.isNotEmpty()) {
+            currentFrame = 0.0f
+            setTexture(animationTextures[0])
+        }
+    }
+}
diff --git a/chapter2/src/chapter2Main/kotlin/BGSpriteComponent.kt b/chapter2/src/chapter2Main/kotlin/BGSpriteComponent.kt
new file mode 100644
index 0000000..3f10a0b
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/BGSpriteComponent.kt
@@ -0,0 +1,52 @@
+package chapter2
+
+import kotlinx.cinterop.*
+import sdl.*
+
+class BGSpriteComponent(owner: Actor, drawOrder: Int = 10) : SpriteComponent(owner, drawOrder) {
+
+    data class BGTexture(val texture: CPointer<SDL_Texture>, val offset: Vector2)
+
+    val bgTextureList = mutableListOf<BGTexture>()
+    var screenSize: Vector2 = Vector2.zero
+    var scrollSpeed: Float = 0.0f
+
+    override fun update(deltaTime: Float) {
+        super.update(deltaTime)
+        for (bg in bgTextureList) {
+            // Update the x offset
+            bg.offset.x += scrollSpeed * deltaTime
+            // If this is completely off the screen, reset offset to
+            // the right of the last bg texture
+            if (bg.offset.x < -screenSize.x) {
+                bg.offset.x = (bgTextureList.size - 1) * screenSize.x - 1
+            }
+        }
+    }
+
+    override fun draw(renderer: CPointer<SDL_Renderer>?) {
+        for (bg in bgTextureList) {
+            memScoped {
+                val r = alloc<SDL_Rect>().apply {
+                    // Assume screen size dimensions
+                    w = screenSize.x.toInt()
+                    h = screenSize.y.toInt()
+                    // Center the rectangle around the position of the owner
+                    x = (owner.position.x - w / 2 + bg.offset.x).toInt()
+                    y = (owner.position.y - h / 2 + bg.offset.y).toInt()
+                }
+                // Draw this background
+                SDL_RenderCopy(renderer, bg.texture, null, r.ptr.reinterpret())
+            }
+        }
+    }
+
+    fun setBGTextures(textures: List<CPointer<SDL_Texture>?>) {
+        for ((count, tex) in textures.withIndex()) {
+            tex ?: continue
+            val offset = Vector2(x = count * screenSize.x, 0f)
+            val temp = BGTexture(texture = tex, offset = offset)
+            bgTextureList.add(temp)
+        }
+    }
+}
diff --git a/chapter2/src/chapter2Main/kotlin/Component.kt b/chapter2/src/chapter2Main/kotlin/Component.kt
new file mode 100644
index 0000000..4f42b39
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/Component.kt
@@ -0,0 +1,15 @@
+package chapter2
+
+open class Component constructor(private val owner: Actor, var updateOrder: Int = 100) {
+
+    init {
+        owner.addComponent(this)
+    }
+
+    open fun update(deltaTime: Float) {
+    }
+
+    open fun dispose() {
+        owner.removeComponent(this)
+    }
+}
diff --git a/chapter2/src/chapter2Main/kotlin/Game.kt b/chapter2/src/chapter2Main/kotlin/Game.kt
new file mode 100644
index 0000000..f654b3a
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/Game.kt
@@ -0,0 +1,226 @@
+package chapter2
+
+import kotlinx.cinterop.*
+import sdl.*
+
+class Game {
+
+    private var isRunning: Boolean = true
+    private var ticksCount: UInt = 0u
+    private var window: CPointer<SDL_Window>? = null
+    private var renderer: CPointer<SDL_Renderer>? = null
+    private var ship: Ship? = null
+    private var actorList = mutableListOf<Actor>()
+    private var pendingActorList = mutableListOf<Actor>()
+    private var spriteList = mutableListOf<SpriteComponent>()
+    private var textureMap = mutableMapOf<String, CPointer<SDL_Texture>>()
+    private var updateActors = false
+
+    fun initialize(): Boolean {
+        val result = SDL_Init(SDL_INIT_VIDEO.toUInt() or SDL_INIT_AUDIO.toUInt())
+        if (result != 0) {
+            throw Error("Unable to initialize SDL: ${SDL_GetError()}")
+        }
+
+        window = SDL_CreateWindow(
+            "Game Programming in Kotlin/Native (Chapter 2)", // Window title
+            100,	// Top left x-coordinate of window
+            100,	// Top left y-coordinate of window
+            1024,	// Width of window
+            768,	// Height of window
+            SDL_WINDOW_SHOWN // Flags (0 for no flags set)
+        )
+
+        if (window == null) {
+            throw Error("Failed to create window: ${SDL_GetError()}")
+        }
+
+        renderer = SDL_CreateRenderer(
+            window, // Window to create renderer for
+            -1, // Usually -1
+            SDL_RENDERER_ACCELERATED or SDL_RENDERER_PRESENTVSYNC
+        )
+
+        if (renderer == null) {
+            throw Error("Failed to create renderer: ${SDL_GetError()}")
+        }
+
+        if (IMG_Init(IMG_INIT_PNG.toInt()) == 0) {
+            throw Error("Unable to initialize SDL_image: ${SDL_GetError()}")
+        }
+
+        loadData()
+
+        ticksCount = SDL_GetTicks()
+
+        return true
+    }
+
+    fun runloop() {
+        while (isRunning) {
+            processInput()
+            updateGame()
+            generateOutput()
+        }
+    }
+
+    private fun processInput() {
+        memScoped {
+            val event = alloc<SDL_Event>()
+            while (SDL_PollEvent(event.ptr.reinterpret()) != 0) {
+                when (event.type) {
+                    SDL_QUIT -> isRunning = false
+                }
+            }
+        }
+
+        val state = SDL_GetKeyboardState(null)
+        state ?: return
+        if (state[SDL_SCANCODE_ESCAPE.toInt()].toInt() != 0) {
+            isRunning = false
+        }
+
+        ship?.processKeyboard(state)
+    }
+
+    private fun updateGame() {
+        // Wait until 16ms has elapsed since last frame
+        while (!SDL_TICKS_PASSED(SDL_GetTicks().toInt(), ticksCount.toInt() + 16)) Unit
+
+        // Delta time is the difference in ticks from last frame
+        // (converted to seconds)
+        var deltaTime = (SDL_GetTicks() - ticksCount).toFloat() / 1000.0f
+
+        // Clamp maximum delta time value
+        if (deltaTime > 0.05f) {
+            deltaTime = 0.05f
+        }
+
+        // Update tick counts (for next frame)
+        ticksCount = SDL_GetTicks()
+
+        updateActors = true
+
+        for (actor in actorList) {
+            actor.update(deltaTime)
+        }
+
+        updateActors = false
+
+        actorList.addAll(pendingActorList)
+        pendingActorList.clear()
+
+        val deadActor = mutableListOf<Actor>()
+
+        for (actor in actorList) {
+            if (actor.state == Actor.State.Dead) {
+                deadActor.add(actor)
+            }
+        }
+
+        deadActor.forEach {
+            it.dispose()
+        }
+    }
+
+    private fun generateOutput() {
+        SDL_SetRenderDrawColor(renderer, 0, 0, 0, 255)
+        SDL_RenderClear(renderer)
+
+        spriteList.forEach { it.draw(renderer) }
+
+        // Swap front buffer and back buffer
+        SDL_RenderPresent(renderer)
+    }
+
+    fun shutdown() {
+        unloadData()
+        IMG_Quit()
+        SDL_DestroyRenderer(renderer)
+        SDL_DestroyWindow(window)
+        SDL_Quit()
+    }
+
+    private fun loadData() {
+        ship = Ship(this).apply {
+            position = Vector2(100f, 384f)
+            scale = 1.5f
+        }
+
+        val actor = Actor(this).apply {
+            position = Vector2(512f, 384f)
+        }
+
+        BGSpriteComponent(actor).apply {
+            screenSize = Vector2(1024f, 768f)
+            setBGTextures(
+                listOf(
+                    getTexture("Assets/Farback01.png"),
+                    getTexture("Assets/Farback02.png")
+                )
+            )
+            scrollSpeed = -100f
+        }
+        BGSpriteComponent(actor, 50).apply {
+            screenSize = Vector2(1024f, 768f)
+            setBGTextures(
+                listOf(
+                    getTexture("Assets/Stars.png"),
+                    getTexture("Assets/Stars.png")
+                )
+            )
+            scrollSpeed = -200f
+        }
+    }
+
+    private fun unloadData() {
+        actorList.forEach {
+            it.dispose()
+        }
+        textureMap.forEach {
+            SDL_DestroyTexture(it.value)
+        }
+        textureMap.clear()
+    }
+
+    fun addActor(actor: Actor) {
+        if (updateActors) {
+            pendingActorList
+        } else {
+            actorList
+        }.add(actor)
+    }
+
+    fun removeActor(actor: Actor) {
+        pendingActorList.remove(actor)
+        actorList.remove(actor)
+    }
+
+    fun addSprite(sprite: SpriteComponent) {
+        spriteList.add(sprite)
+        spriteList.sortBy { it.drawOrder }
+    }
+
+    fun removeSprite(sprite: SpriteComponent) {
+        spriteList.remove(sprite)
+    }
+
+    fun getTexture(path: String): CPointer<SDL_Texture> {
+        var texture = textureMap[path]
+        if (texture != null) {
+            return texture
+        } else {
+            val surface = IMG_Load(path) ?: throw Error("Failed to load texture file $path")
+
+            texture = SDL_CreateTextureFromSurface(renderer, surface)
+            SDL_FreeSurface(surface)
+            if (texture == null) {
+                throw Error("Failed to convert surface to texture for $path")
+            }
+            textureMap[path] = texture
+        }
+        return texture
+    }
+
+    private inline fun SDL_TICKS_PASSED(a: Int, b: Int): Boolean = (b - a) <= 0
+}
diff --git a/chapter2/src/chapter2Main/kotlin/Math.kt b/chapter2/src/chapter2Main/kotlin/Math.kt
new file mode 100644
index 0000000..6ac729b
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/Math.kt
@@ -0,0 +1,6 @@
+package chapter2
+
+const val pi = 3.1415926535f
+
+fun toDegree(radian: Float): Float = radian * 180f / pi
+fun Float.toDegree(): Float = toDegree(this)
diff --git a/chapter2/src/chapter2Main/kotlin/Ship.kt b/chapter2/src/chapter2Main/kotlin/Ship.kt
new file mode 100644
index 0000000..709e78d
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/Ship.kt
@@ -0,0 +1,62 @@
+package chapter2
+
+import kotlinx.cinterop.*
+import sdl.*
+
+class Ship(game: Game) : Actor(game) {
+
+    private var rightSpeed = 0.0f
+    private var downSpeed = 0.0f
+
+    init {
+        val component = AnimSpriteComponent(this)
+        component.setAnimationTextures(
+            listOf(
+                game.getTexture("Assets/Ship01.png"),
+                game.getTexture("Assets/Ship02.png"),
+                game.getTexture("Assets/Ship03.png"),
+                game.getTexture("Assets/Ship04.png")
+            )
+        )
+    }
+
+    override fun updateActor(deltaTime: Float) {
+        super.updateActor(deltaTime)
+        val pos: Vector2 = position
+        pos.x += rightSpeed * deltaTime
+        pos.y += downSpeed * deltaTime
+        // Restrict position to left half of screen
+        // Restrict position to left half of screen
+        if (pos.x < 25.0f) {
+            pos.x = 25.0f
+        } else if (pos.x > 500.0f) {
+            pos.x = 500.0f
+        }
+        if (pos.y < 25.0f) {
+            pos.y = 25.0f
+        } else if (pos.y > 743.0f) {
+            pos.y = 743.0f
+        }
+        position = pos
+    }
+
+    fun processKeyboard(state: CPointer<Uint8Var>?) {
+        state ?: return
+        rightSpeed = 0.0f
+        downSpeed = 0.0f
+        // right/left
+        if (state[SDL_SCANCODE_D.toInt()].toInt() != 0) {
+            rightSpeed += 250.0f
+        }
+        if (state[SDL_SCANCODE_A.toInt()].toInt() != 0) {
+            rightSpeed -= 250.0f
+        }
+        // up/down
+        if (state[SDL_SCANCODE_S.toInt()].toInt() != 0) {
+            downSpeed += 300.0f
+        }
+        if (state[SDL_SCANCODE_W.toInt()].toInt() != 0) {
+            downSpeed -= 300.0f
+        }
+    }
+}
diff --git a/chapter2/src/chapter2Main/kotlin/SpriteComponent.kt b/chapter2/src/chapter2Main/kotlin/SpriteComponent.kt
new file mode 100644
index 0000000..caef51f
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/SpriteComponent.kt
@@ -0,0 +1,44 @@
+package chapter2
+
+import kotlinx.cinterop.*
+import sdl.*
+
+open class SpriteComponent(val owner: Actor, var drawOrder: Int = 100) : Component(owner) {
+
+    private var texture: CPointer<SDL_Texture>? = null
+    private var textureWidth: Int = 0
+    private var textureHeight: Int = 0
+
+    init {
+        owner.game.addSprite(this)
+    }
+
+    open fun draw(renderer: CPointer<SDL_Renderer>?) {
+        memScoped {
+            val r = alloc<SDL_Rect>().apply {
+                w = (textureWidth.toFloat() * owner.scale).toInt()
+                h = (textureHeight.toFloat() * owner.scale).toInt()
+                x = (owner.position.x - w / 2).toInt()
+                y = (owner.position.y - h / 2).toInt()
+            }
+
+            SDL_RenderCopyEx(renderer, texture, null, r.ptr.reinterpret(), -owner.rotation.toDegree().toDouble(), null, SDL_FLIP_NONE)
+        }
+    }
+
+    fun setTexture(tex: CPointer<SDL_Texture>?) {
+        texture = tex
+        memScoped {
+            val width = alloc<IntVar>()
+            val height = alloc<IntVar>()
+            SDL_QueryTexture(texture, null, null, width.ptr.reinterpret(), height.ptr.reinterpret())
+            textureWidth = width.value
+            textureHeight = height.value
+        }
+    }
+
+    override fun dispose() {
+        super.dispose()
+        owner.game.removeSprite(this)
+    }
+}
diff --git a/chapter2/src/chapter2Main/kotlin/Vector2.kt b/chapter2/src/chapter2Main/kotlin/Vector2.kt
new file mode 100644
index 0000000..3924329
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/Vector2.kt
@@ -0,0 +1,7 @@
+package chapter2
+
+data class Vector2(var x: Float, var y: Float) {
+    companion object {
+        val zero = Vector2(0f, 0f)
+    }
+}
diff --git a/chapter2/src/chapter2Main/kotlin/main.kt b/chapter2/src/chapter2Main/kotlin/main.kt
new file mode 100644
index 0000000..6dcdbe6
--- /dev/null
+++ b/chapter2/src/chapter2Main/kotlin/main.kt
@@ -0,0 +1,14 @@
+package chapter2
+
+fun main() {
+    val game = Game()
+    val result = game.initialize()
+
+    if (result) {
+        game.runloop()
+    }
+
+    game.shutdown()
+
+    return
+}
diff --git a/chapter2/src/chapter2Main/resources/Assets/.gitkeep b/chapter2/src/chapter2Main/resources/Assets/.gitkeep
new file mode 100644
index 0000000..e69de29
diff --git a/chapter2/src/nativeInterop/cinterop/sdl.def b/chapter2/src/nativeInterop/cinterop/sdl.def
new file mode 100644
index 0000000..34500e3
--- /dev/null
+++ b/chapter2/src/nativeInterop/cinterop/sdl.def
@@ -0,0 +1,7 @@
+headers = SDL.h SDL_Image.h stdlib.h time.h
+entryPoint = SDL_main
+
+headerFilter = SDL* stdlib.h time.h
+
+compilerOpts.osx = -D_POSIX_SOURCE 
+linkerOpts.osx = -L/usr/local/lib -lSDL2 -lSDL2_image
\ No newline at end of file