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‎chapter25/nbactions.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<actions>
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<action>
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<actionName>run</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.2.1:exec</goal>
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</goals>
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<properties>
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<exec.args>-classpath %classpath org.lwjglb.game.Main</exec.args>
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<exec.executable>java</exec.executable>
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</properties>
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</action>
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<action>
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<actionName>debug</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.2.1:exec</goal>
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</goals>
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<properties>
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<exec.args>-Xdebug -Xrunjdwp:transport=dt_socket,server=n,address=${jpda.address} -classpath %classpath org.lwjglb.game.Main</exec.args>
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<exec.executable>java</exec.executable>
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<jpda.listen>true</jpda.listen>
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</properties>
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</action>
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<action>
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<actionName>profile</actionName>
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<packagings>
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<packaging>jar</packaging>
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</packagings>
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<goals>
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<goal>process-classes</goal>
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<goal>org.codehaus.mojo:exec-maven-plugin:1.2.1:exec</goal>
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</goals>
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<properties>
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<exec.args>-classpath %classpath org.lwjglb.game.Main</exec.args>
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<exec.executable>java</exec.executable>
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</properties>
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</action>
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</actions>

‎chapter25/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<parent>
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<groupId>org.lwjglb</groupId>
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<artifactId>book</artifactId>
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<version>1.0</version>
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<relativePath>../pom.xml</relativePath>
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</parent>
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<artifactId>game-c25</artifactId>
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<version>1.0</version>
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<dependencies>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl</artifactId>
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<version>${lwjgl.version}</version>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-glfw</artifactId>
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<version>${lwjgl.version}</version>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-opengl</artifactId>
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<version>${lwjgl.version}</version>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-openal</artifactId>
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<version>${lwjgl.version}</version>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-stb</artifactId>
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<version>${lwjgl.version}</version>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-nanovg</artifactId>
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<version>${lwjgl.version}</version>
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</dependency>
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<dependency>
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<groupId>org.joml</groupId>
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<artifactId>joml</artifactId>
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<version>${joml.version}</version>
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</dependency>
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<dependency>
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<groupId>org.l33tlabs.twl</groupId>
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<artifactId>pngdecoder</artifactId>
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<version>${pngdecoder.version}</version>
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</dependency>
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<!-- Natives -->
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl</artifactId>
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<version>${lwjgl.version}</version>
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<classifier>${native.target}</classifier>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-opengl</artifactId>
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<version>${lwjgl.version}</version>
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<classifier>${native.target}</classifier>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-glfw</artifactId>
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<version>${lwjgl.version}</version>
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<classifier>${native.target}</classifier>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-openal</artifactId>
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<version>${lwjgl.version}</version>
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<classifier>${native.target}</classifier>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-stb</artifactId>
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<version>${lwjgl.version}</version>
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<classifier>${native.target}</classifier>
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<scope>runtime</scope>
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</dependency>
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<dependency>
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<groupId>org.lwjgl</groupId>
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<artifactId>lwjgl-nanovg</artifactId>
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<version>${lwjgl.version}</version>
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<classifier>${native.target}</classifier>
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<scope>runtime</scope>
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</dependency>
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</dependencies>
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</project>

‎chapter25/src/main/java/org/lwjglb/engine/GameEngine.java‎

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package org.lwjglb.engine;
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import org.lwjglb.engine.sound.SoundManager;
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public class GameEngine implements Runnable {
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public static final int TARGET_FPS = 75;
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public static final int TARGET_UPS = 30;
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private final Window window;
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private final Thread gameLoopThread;
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private final Timer timer;
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private final IGameLogic gameLogic;
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private final MouseInput mouseInput;
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private double lastFps;
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private int fps;
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private String windowTitle;
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public GameEngine(String windowTitle, boolean vSync, Window.WindowOptions opts, IGameLogic gameLogic) throws Exception {
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this(windowTitle, 0, 0, vSync, opts, gameLogic);
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}
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public GameEngine(String windowTitle, int width, int height, boolean vSync, Window.WindowOptions opts, IGameLogic gameLogic) throws Exception {
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this.windowTitle = windowTitle;
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gameLoopThread = new Thread(this, "GAME_LOOP_THREAD");
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window = new Window(windowTitle, width, height, vSync, opts);
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mouseInput = new MouseInput();
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this.gameLogic = gameLogic;
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timer = new Timer();
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}
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public void start() {
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String osName = System.getProperty("os.name");
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if ( osName.contains("Mac") ) {
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gameLoopThread.run();
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} else {
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gameLoopThread.start();
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}
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}
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@Override
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public void run() {
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try {
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init();
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gameLoop();
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} catch (Exception excp) {
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excp.printStackTrace();
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} finally {
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cleanup();
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}
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}
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protected void init() throws Exception {
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window.init();
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timer.init();
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mouseInput.init(window);
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gameLogic.init(window);
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lastFps = timer.getTime();
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fps = 0;
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}
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protected void gameLoop() {
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float elapsedTime;
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float accumulator = 0f;
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float interval = 1f / TARGET_UPS;
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boolean running = true;
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while (running && !window.windowShouldClose()) {
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elapsedTime = timer.getElapsedTime();
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accumulator += elapsedTime;
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input();
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while (accumulator >= interval) {
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update(interval);
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accumulator -= interval;
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}
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render();
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if ( !window.isvSync() ) {
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sync();
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}
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}
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}
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protected void cleanup() {
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gameLogic.cleanup();
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}
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private void sync() {
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float loopSlot = 1f / TARGET_FPS;
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double endTime = timer.getLastLoopTime() + loopSlot;
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while (timer.getTime() < endTime) {
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try {
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Thread.sleep(1);
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} catch (InterruptedException ie) {
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}
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}
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}
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protected void input() {
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mouseInput.input(window);
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gameLogic.input(window, mouseInput);
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}
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protected void update(float interval) {
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gameLogic.update(interval, mouseInput, window);
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}
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protected void render() {
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if ( window.getWindowOptions().showFps && timer.getLastLoopTime() - lastFps > 1 ) {
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lastFps = timer.getLastLoopTime();
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window.setWindowTitle(windowTitle + " - " + fps + " FPS");
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fps = 0;
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}
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fps++;
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gameLogic.render(window);
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window.update();
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}
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}

‎chapter25/src/main/java/org/lwjglb/engine/IGameLogic.java‎

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package org.lwjglb.engine;
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public interface IGameLogic {
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void init(Window window) throws Exception;
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void input(Window window, MouseInput mouseInput);
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void update(float interval, MouseInput mouseInput, Window window);
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void render(Window window);
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void cleanup();
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}

‎chapter25/src/main/java/org/lwjglb/engine/MouseInput.java‎

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package org.lwjglb.engine;
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import org.joml.Vector2d;
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import org.joml.Vector2f;
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import static org.lwjgl.glfw.GLFW.*;
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import org.lwjgl.glfw.GLFWCursorPosCallback;
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import org.lwjgl.glfw.GLFWCursorEnterCallback;
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import org.lwjgl.glfw.GLFWMouseButtonCallback;
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public class MouseInput {
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private final Vector2d previousPos;
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private final Vector2d currentPos;
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private final Vector2f displVec;
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private boolean inWindow = false;
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private boolean leftButtonPressed = false;
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private boolean rightButtonPressed = false;
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private GLFWCursorPosCallback cursorPosCallback;
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private GLFWCursorEnterCallback cursorEnterCallback;
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private GLFWMouseButtonCallback mouseButtonCallback;
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public MouseInput() {
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previousPos = new Vector2d(-1, -1);
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currentPos = new Vector2d(0, 0);
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displVec = new Vector2f();
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}
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public void init(Window window) {
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glfwSetCursorPosCallback(window.getWindowHandle(), cursorPosCallback = new GLFWCursorPosCallback() {
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@Override
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public void invoke(long window, double xpos, double ypos) {
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currentPos.x = xpos;
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currentPos.y = ypos;
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}
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});
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glfwSetCursorEnterCallback(window.getWindowHandle(), cursorEnterCallback = new GLFWCursorEnterCallback() {
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@Override
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public void invoke(long window, boolean entered) {
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inWindow = entered;
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}
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});
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glfwSetMouseButtonCallback(window.getWindowHandle(), mouseButtonCallback = new GLFWMouseButtonCallback() {
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@Override
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public void invoke(long window, int button, int action, int mods) {
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leftButtonPressed = button == GLFW_MOUSE_BUTTON_1 && action == GLFW_PRESS;
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rightButtonPressed = button == GLFW_MOUSE_BUTTON_2 && action == GLFW_PRESS;
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}
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});
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}
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public Vector2f getDisplVec() {
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return displVec;
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}
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public Vector2d getCurrentPos() {
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return currentPos;
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}
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public void input(Window window) {
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displVec.x = 0;
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displVec.y = 0;
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if (previousPos.x > 0 && previousPos.y > 0 && inWindow) {
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double deltax = currentPos.x - previousPos.x;
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double deltay = currentPos.y - previousPos.y;
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boolean rotateX = deltax != 0;
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boolean rotateY = deltay != 0;
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if (rotateX) {
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displVec.y = (float) deltax;
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}
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if (rotateY) {
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displVec.x = (float) deltay;
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}
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}
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previousPos.x = currentPos.x;
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previousPos.y = currentPos.y;
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}
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public boolean isLeftButtonPressed() {
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return leftButtonPressed;
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}
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public boolean isRightButtonPressed() {
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return rightButtonPressed;
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}
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}

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