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The main purpose of this libraryis to modernize and maintain the slick2D library.
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package com.github.mathiewz.slick;
import java.applet.Applet;
import java.awt.BorderLayout;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Font;
import java.awt.GridLayout;
import java.awt.Label;
import java.awt.Panel;
import java.awt.TextArea;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.nio.ByteBuffer;
import org.lwjgl.BufferUtils;
import org.lwjgl.LWJGLException;
import org.lwjgl.input.Cursor;
import org.lwjgl.input.Mouse;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.GL11;
import org.lwjgl.opengl.PixelFormat;
import com.github.mathiewz.slick.openal.SoundStore;
import com.github.mathiewz.slick.opengl.CursorLoader;
import com.github.mathiewz.slick.opengl.ImageData;
import com.github.mathiewz.slick.opengl.InternalTextureLoader;
import com.github.mathiewz.slick.util.Log;
/**
* A game container that displays the game as an applet. Note however that the
* actual game container implementation is an internal class which can be
* obtained with the getContainer() method - this is due to the Applet being a
* class wrap than an interface.
*
* @author kevin
*/
public class AppletGameContainer extends Applet {
/** The GL Canvas used for this container */
protected transient ContainerPanel canvas;
/** The actual container implementation */
protected transient Container container;
/** The parent of the display */
protected Canvas displayParent;
/** The thread that is looping for the game */
protected transient Thread gameThread;
/** Alpha background supported */
protected boolean alphaSupport = true;
/**
* @see java.applet.Applet#destroy()
*/
@Override
public void destroy() {
if (displayParent != null) {
remove(displayParent);
}
super.destroy();
Log.info("Clear up");
}
/**
* Clean up the LWJGL resources
*/
private void destroyLWJGL() {
container.stopApplet();
try {
gameThread.join();
} catch (InterruptedException e) {
Log.error(e);
}
}
/**
* Start a thread to run LWJGL in
*/
public void startLWJGL() {
if (gameThread != null) {
return;
}
gameThread = new Thread() {
@Override
public void run() {
try {
canvas.start();
} catch (Exception e) {
Log.error(e);
if (Display.isCreated()) {
Display.destroy();
}
displayParent.setVisible(false);
add(new ConsolePanel(e));
validate();
}
}
};
gameThread.start();
}
/**
* @see java.applet.Applet#init()
*/
@Override
public void init() {
removeAll();
setLayout(new BorderLayout());
setIgnoreRepaint(true);
try {
Game game = (Game) Class.forName(getParameter("game")).newInstance();
container = new Container(game);
canvas = new ContainerPanel(container);
displayParent = new Canvas() {
@Override
public final void addNotify() {
super.addNotify();
startLWJGL();
}
@Override
public final void removeNotify() {
destroyLWJGL();
super.removeNotify();
}
};
displayParent.setSize(getWidth(), getHeight());
add(displayParent);
displayParent.setFocusable(true);
displayParent.requestFocus();
displayParent.setIgnoreRepaint(true);
setVisible(true);
} catch (Exception e) {
Log.error(e);
throw new SlickException("Unable to create game container");
}
}
/**
* Create a new panel to display the GL context
*
* @author kevin
*/
public class ContainerPanel {
/** The container being displayed on this canvas */
private final Container container;
/**
* Create a new panel
*
* @param container
* The container we're running
*/
public ContainerPanel(Container container) {
this.container = container;
}
/**
* Create the LWJGL display
*
* @throws LWJGLException
*
* @throws Exception
* Failure to create display
*/
private void createDisplay() throws LWJGLException {
try {
// create display with alpha
Display.create(new PixelFormat(8, 8, GameContainer.stencil ? 8 : 0));
alphaSupport = true;
} catch (Exception e) {
// if we couldn't get alpha, let us know
alphaSupport = false;
Display.destroy();
// create display without alpha
Display.create();
}
}
/**
* Start the game container
*/
public void start() {
try {
Display.setParent(displayParent);
Display.setVSyncEnabled(true);
createDisplay();
} catch (LWJGLException e) {
Log.error(e);
try {
Thread.sleep(1000);
createDisplay();
} catch (InterruptedException | LWJGLException nestedEx) {
throw new SlickException("Failed to create display", nestedEx);
}
}
initGL();
displayParent.requestFocus();
container.runloop();
}
/**
* Initialise GL state
*/
protected void initGL() {
try {
InternalTextureLoader.get().clear();
SoundStore.get().clear();
container.initApplet();
} catch (Exception e) {
Log.error(e);
container.stopApplet();
}
}
}
/**
* A game container to provide the applet context
*
* @author kevin
*/
public class Container extends GameContainer {
private static final String MOUSE_CURSOR_ERROR = "Failed to set mouse cursor";
/**
* Create a new container wrapped round the game
*
* @param game
* The game to be held in this container
*/
public Container(Game game) {
super(game);
width = AppletGameContainer.this.getWidth();
height = AppletGameContainer.this.getHeight();
}
/**
* Initiliase based on Applet init
*
*/
public void initApplet() {
initSystem();
enterOrtho();
try {
getInput().initControllers();
} catch (Exception e) {
Log.info("Controllers not available");
}
game.init(this);
getDelta();
}
/**
* Check if the applet is currently running
*
* @return True if the applet is running
*/
public boolean isRunning() {
return running;
}
/**
* Stop the applet play back
*/
public void stopApplet() {
running = false;
}
/**
* @see com.github.mathiewz.slick.GameContainer#getScreenHeight()
*/
@Override
public int getScreenHeight() {
return 0;
}
/**
* @see com.github.mathiewz.slick.GameContainer#getScreenWidth()
*/
@Override
public int getScreenWidth() {
return 0;
}
/**
* Check if the display created supported alpha in the back buffer
*
* @return True if the back buffer supported alpha
*/
public boolean supportsAlphaInBackBuffer() {
return alphaSupport;
}
/**
* @see com.github.mathiewz.slick.GameContainer#hasFocus()
*/
@Override
public boolean hasFocus() {
return true;
}
/**
* Returns the Applet Object
*
* @return Applet Object
*/
public Applet getApplet() {
return AppletGameContainer.this;
}
/**
* @see com.github.mathiewz.slick.GameContainer#setIcon(java.lang.String)
*/
@Override
public void setIcon(String ref) {
// unsupported in an applet
}
/**
* @see com.github.mathiewz.slick.GameContainer#setMouseGrabbed(boolean)
*/
@Override
public void setMouseGrabbed(boolean grabbed) {
Mouse.setGrabbed(grabbed);
}
/**
* @see com.github.mathiewz.slick.GameContainer#isMouseGrabbed()
*/
@Override
public boolean isMouseGrabbed() {
return Mouse.isGrabbed();
}
/**
* @see com.github.mathiewz.slick.GameContainer#setMouseCursor(java.lang.String,
* int, int)
*/
@Override
public void setMouseCursor(String ref, int hotSpotX, int hotSpotY) {
try {
Cursor cursor = CursorLoader.get().getCursor(ref, hotSpotX, hotSpotY);
Mouse.setNativeCursor(cursor);
} catch (Exception e) {
throw new SlickException(MOUSE_CURSOR_ERROR, e);
}
}
/**
* Get the closest greater power of 2 to the fold number
*
* @param fold
* The target number
* @return The power of 2
*/
private int get2Fold(int fold) {
int ret = 2;
while (ret < fold) {
ret *= 2;
}
return ret;
}
/**
* {@inheritDoc}
*/
@Override
public void setMouseCursor(Image image, int hotSpotX, int hotSpotY) {
try {
Image temp = new Image(get2Fold(image.getWidth()), get2Fold(image.getHeight()));
Graphics g = temp.getGraphics();
ByteBuffer buffer = BufferUtils.createByteBuffer(temp.getWidth() * temp.getHeight() * 4);
g.drawImage(image.getFlippedCopy(false, true), 0, 0);
g.flush();
g.getArea(0, 0, temp.getWidth(), temp.getHeight(), buffer);
Cursor cursor = CursorLoader.get().getCursor(buffer, hotSpotX, hotSpotY, temp.getWidth(), temp.getHeight());
Mouse.setNativeCursor(cursor);
} catch (Exception e) {
throw new SlickException(MOUSE_CURSOR_ERROR, e);
}
}
/**
* @see com.github.mathiewz.slick.GameContainer#setIcons(java.lang.String[])
*/
@Override
public void setIcons(String[] refs) {
// unsupported in an applet
}
/**
* @see com.github.mathiewz.slick.GameContainer#setMouseCursor(com.github.mathiewz.slick.opengl.ImageData, int, int)
*/
@Override
public void setMouseCursor(ImageData data, int hotSpotX, int hotSpotY) {
try {
Cursor cursor = CursorLoader.get().getCursor(data, hotSpotX, hotSpotY);
Mouse.setNativeCursor(cursor);
} catch (Exception e) {
throw new SlickException(MOUSE_CURSOR_ERROR, e);
}
}
/**
* @see com.github.mathiewz.slick.GameContainer#setMouseCursor(org.lwjgl.input.Cursor, int, int)
*/
@Override
public void setMouseCursor(Cursor cursor, int hotSpotX, int hotSpotY) {
try {
Mouse.setNativeCursor(cursor);
} catch (Exception e) {
throw new SlickException(MOUSE_CURSOR_ERROR, e);
}
}
/**
* @see com.github.mathiewz.slick.GameContainer#setDefaultMouseCursor()
*/
@Override
public void setDefaultMouseCursor() {
// Nothing to do here
}
@Override
public boolean isFullscreen() {
return Display.isFullscreen();
}
@Override
public void setFullscreen(boolean fullscreen) {
if (fullscreen == isFullscreen()) {
return;
}
try {
if (fullscreen) {
// get current screen resolution
int screenWidth = Display.getDisplayMode().getWidth();
int screenHeight = Display.getDisplayMode().getHeight();
// calculate aspect ratio
float gameAspectRatio = (float) width / height;
float screenAspectRatio = (float) screenWidth / screenHeight;
int newWidth;
int newHeight;
// get new screen resolution to match aspect ratio
if (gameAspectRatio >= screenAspectRatio) {
newWidth = screenWidth;
newHeight = (int) (height / ((float) width / screenWidth));
} else {
newWidth = (int) (width / ((float) height / screenHeight));
newHeight = screenHeight;
}
// center new screen
int xoffset = (screenWidth - newWidth) / 2;
int yoffset = (screenHeight - newHeight) / 2;
// scale game to match new resolution
GL11.glViewport(xoffset, yoffset, newWidth, newHeight);
enterOrtho();
// fix input to match new resolution
getInput().setOffset(-xoffset * (float) width / newWidth, -yoffset * (float) height / newHeight);
getInput().setScale((float) width / newWidth, (float) height / newHeight);
width = screenWidth;
height = screenHeight;
Display.setFullscreen(true);
} else {
// restore input
getInput().setOffset(0, 0);
getInput().setScale(1, 1);
width = AppletGameContainer.this.getWidth();
height = AppletGameContainer.this.getHeight();
GL11.glViewport(0, 0, width, height);
enterOrtho();
Display.setFullscreen(false);
}
} catch (LWJGLException e) {
Log.error(e);
}
}
/**
* The running game loop
*
*/
public void runloop() {
while (running) {
int delta = getDelta();
updateAndRender(delta);
updateFPS();
Display.update();
}
Display.destroy();
}
}
/**
* A basic console to display an error message if the applet crashes.
* This will prevent the applet from just freezing in the browser
* and give the end user an a nice gui where the error message can easily
* be viewed and copied.
*/
public class ConsolePanel extends Panel {
/** The area display the console output */
TextArea textArea = new TextArea();
/**
* Create a new panel to display the console output
*
* @param e
* The exception causing the console to be displayed
*/
public ConsolePanel(Exception e) {
setLayout(new BorderLayout());
setBackground(Color.black);
setForeground(Color.white);
Font consoleFont = new Font("Arial", Font.BOLD, 14);
Label slickLabel = new Label("SLICK CONSOLE", Label.CENTER);
slickLabel.setFont(consoleFont);
add(slickLabel, BorderLayout.PAGE_START);
StringWriter sw = new StringWriter();
e.printStackTrace(new PrintWriter(sw));
textArea.setText(sw.toString());
textArea.setEditable(false);
add(textArea, BorderLayout.CENTER);
// add a border on both sides of the console
add(new Panel(), BorderLayout.LINE_START);
add(new Panel(), BorderLayout.LINE_END);
Panel bottomPanel = new Panel();
bottomPanel.setLayout(new GridLayout(0, 1));
Label infoLabel1 = new Label("An error occured while running the applet.", Label.CENTER);
Label infoLabel2 = new Label("Plese contact support to resolve this issue.", Label.CENTER);
infoLabel1.setFont(consoleFont);
infoLabel2.setFont(consoleFont);
bottomPanel.add(infoLabel1);
bottomPanel.add(infoLabel2);
add(bottomPanel, BorderLayout.PAGE_END);
}
}
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