Game.java

package chu.engine;
import static org.lwjgl.opengl.GL11.GL_ALPHA_TEST;
import static org.lwjgl.opengl.GL11.GL_BLEND;
import static org.lwjgl.opengl.GL11.GL_DEPTH_TEST;
import static org.lwjgl.opengl.GL11.GL_GREATER;
import static org.lwjgl.opengl.GL11.GL_LEQUAL;
import static org.lwjgl.opengl.GL11.GL_MODELVIEW;
import static org.lwjgl.opengl.GL11.GL_ONE_MINUS_SRC_ALPHA;
import static org.lwjgl.opengl.GL11.GL_PROJECTION;
import static org.lwjgl.opengl.GL11.GL_SMOOTH;
import static org.lwjgl.opengl.GL11.GL_SRC_ALPHA;
import static org.lwjgl.opengl.GL11.GL_TEXTURE_2D;
import static org.lwjgl.opengl.GL11.glAlphaFunc;
import static org.lwjgl.opengl.GL11.glBlendFunc;
import static org.lwjgl.opengl.GL11.glClearColor;
import static org.lwjgl.opengl.GL11.glClearDepth;
import static org.lwjgl.opengl.GL11.glDepthFunc;
import static org.lwjgl.opengl.GL11.glEnable;
import static org.lwjgl.opengl.GL11.glLoadIdentity;
import static org.lwjgl.opengl.GL11.glMatrixMode;
import static org.lwjgl.opengl.GL11.glOrtho;
import static org.lwjgl.opengl.GL11.glShadeModel;
import static org.lwjgl.opengl.GL11.glViewport;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;

import net.fe.network.Message;

import org.lwjgl.LWJGLException;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;


public abstract class Game {
	
	protected static int windowWidth = 640;
	protected static int windowHeight = 480;
	protected static int scaleX = 2;
	protected static int scaleY = 2;
	protected boolean paused = false;
	protected static List<KeyboardEvent> keys;
	protected static List<MouseEvent> mouseEvents;
	protected static CopyOnWriteArrayList<Message> messages;
	protected long time;
	protected static long timeDelta;
	protected static boolean glContextExists;
	
	public void init(int width, int height, String name) {
		time = System.nanoTime();
		
		windowWidth = width*scaleX;
		windowHeight = height*scaleY;

		try {
			Display.setDisplayMode(new DisplayMode(windowWidth, windowHeight));
			Display.create();
			Display.setTitle(name);
			Keyboard.create();
			Keyboard.enableRepeatEvents(true);
			Mouse.create();
			glContextExists = true;
		} catch (LWJGLException e) {
			e.printStackTrace();
			System.exit(0);
		}
		
		//init OpenGL
		glEnable(GL_DEPTH_TEST);
		glDepthFunc(GL_LEQUAL);
		glEnable(GL_ALPHA_TEST);
		glAlphaFunc(GL_GREATER, 0.01f);
		glEnable(GL_TEXTURE_2D);
		glShadeModel(GL_SMOOTH);
		glClearDepth(1.0f);
		glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		glViewport(0, 0, windowWidth, windowHeight);
		glMatrixMode(GL_PROJECTION);
		glLoadIdentity();
		glOrtho(0, windowWidth/scaleX, windowHeight/scaleY, 0, 1, -1);		//It's basically a camera
		glMatrixMode(GL_MODELVIEW);
		
		keys = new ArrayList<KeyboardEvent>();
		mouseEvents = new ArrayList<MouseEvent>();
	}
	
	public abstract void loop();


	public static void getInput() {
		Keyboard.poll();
		keys.clear();
		while(Keyboard.next()) {
			KeyboardEvent ke = new KeyboardEvent(
					Keyboard.getEventKey(),
					Keyboard.getEventCharacter(),
					Keyboard.isRepeatEvent(),
					Keyboard.getEventKeyState());
			keys.add(ke);
		}
		Mouse.poll();
		mouseEvents.clear();
		while(Mouse.next()) {
			MouseEvent me = new MouseEvent(
					Mouse.getEventX(),
					Mouse.getEventY(),
					Mouse.getEventDWheel(),
					Mouse.getEventButton(),
					Mouse.getEventButtonState());
			mouseEvents.add(me);
		}
	}
	
	public static List<KeyboardEvent> getKeys() {
		return keys;
	}
	
	public static List<MouseEvent> getMouseEvents() {
		return mouseEvents;
	}
	
	public static List<Message> getMessages() {
		return messages;
	}

	public static long getDelta() {
		return timeDelta;
	}
	
	public static float getDeltaMillis() {
		return timeDelta/1000000.0f;
	}
	
	public static float getDeltaSeconds() {
		return timeDelta/1000000000.0f;
	}
	
	public static int getWindowWidth() {
		return windowWidth;
	}
	
	public static int getWindowHeight() {
		return windowHeight;
	}

	public static boolean glContextExists() {
		return glContextExists;
	}
	
	public static int getScaleX() {
		return scaleX;
	}
	
	public static int getScaleY() {
		return scaleY;
	}
}