src/com/plusminus/craft/XRay.java

package com.plusminus.craft;

import java.awt.AlphaComposite;
import java.awt.BasicStroke;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.awt.Rectangle;
import java.awt.geom.Rectangle2D;
import java.awt.RenderingHints;
import java.io.File;
import java.io.IOException;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.nio.ByteBuffer;
import java.nio.FloatBuffer;
import java.util.HashMap;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.Properties;
import java.util.Enumeration;
import java.util.Vector;
import java.util.Collections;

import javax.imageio.ImageIO;
import javax.swing.JOptionPane;
import javax.swing.JFileChooser;

import org.lwjgl.Sys;
import org.lwjgl.opengl.Display;
import org.lwjgl.opengl.DisplayMode;
import org.lwjgl.opengl.GL11;
import org.lwjgl.util.glu.*;
import org.lwjgl.input.Keyboard;
import org.lwjgl.input.Mouse;

import com.plusminus.craft.WorldInfo;
import static com.plusminus.craft.MineCraftConstants.*;

public class XRay {

	/**
	 * Private class to provide a sorted properties list in our config file.
	 * Taken from http://www.rgagnon.com/javadetails/java-0614.html
	 */
	private class SortedProperties extends Properties {

		// Added at the behest of Eclipse (or, well, presumably Java itself)
		private static final long serialVersionUID = 2578311914423692774L;

		/**
		 * Overrides, called by the store method.
		 */
		@SuppressWarnings({ "unchecked", "rawtypes" })
		public synchronized Enumeration keys() {
			Enumeration keysEnum = super.keys();
			Vector keyList = new Vector();
			while (keysEnum.hasMoreElements()) {
				keyList.add(keysEnum.nextElement());
			}
			Collections.sort(keyList);
			return keyList.elements();
		}
	}

	// number of chunks around the camera which are visible (Square)
	private int visible_chunk_range = 5;

	private static final int[] CHUNK_RANGES_KEYS = new int[6];
	private static final int[] CHUNK_RANGES = new int[] { 3, 4, 5, 6, 7, 8 };
	private int currentChunkRange = 4;

	// highlight distance
	private static final int[] HIGHLIGHT_RANGES_KEYS = new int[7];
	private static final int[] HIGHLIGHT_RANGES = new int[] { 2, 3, 4, 5, 6, 7,
			8 };
	private int currentHighlightDistance = 1;

	// ore highlight vars
	private static BLOCK[] HIGHLIGHT_ORES = new BLOCK[preferred_highlight_ores.length];
	private static final int[] HIGHLIGHT_ORE_KEYS = new int[preferred_highlight_ores.length];

	// By default we'll keep 20x20 chunks in our cache, which should hopefully
	// let
	// us stay ahead of the camera
	// TODO: keep this at 8, or back up to 10?
	private final int loadChunkRange = 8;

	// set to true when the program is finished
	private boolean done = false;
	// are we full screen
	private boolean fullscreen = false;
	// window title
	private final String app_version = "2.7 Maintenance Branch 8";
	private final String app_name = "Minecraft X-Ray";
	private final String windowTitle = app_name + " " + app_version;

	// Minimap size - I did try increasing this but there were some performance
	// issues
	private final int minimap_dim = 2048;
	private final float minimap_dim_f = (float) minimap_dim;
	private final int minimap_dim_h = minimap_dim / 2;
	private final float minimap_dim_h_f = (float) minimap_dim_h;
	private boolean minimap_needs_updating = false;

	// current display mode
	private DisplayMode displayMode;

	// last system time in the main loop (to calculate delta for camera
	// movement)
	private long lastTime;

	// our camera
	private FirstPersonCameraController camera;
	private boolean camera_lock = false;

	// the current mouseX and mouseY on the screen
	private int mouseX;
	private int mouseY;

	// the sprite sheet for all textures
	public Texture minecraftTexture;
	public Texture paintingTexture;
	public Texture portalTexture;
	public Texture loadingTextTexture;

	// the textures used by the minimap
	private Texture minimapTexture;
	private Texture minimapArrowTexture;
	private Graphics2D minimapGraphics;

	// Whether or not we're showing bedrock/water/explored areas
	private boolean render_bedrock = false;
	private boolean render_water = true;
	private boolean highlight_explored = false;

	// the minecraft level we are exploring
	private MinecraftLevel level;

	// the current block (universal coordinate) where the camera is hovering on
	private int levelBlockX, levelBlockZ;

	// the current and previous chunk coordinates where the camera is hovering
	// on
	private int currentLevelX, currentLevelZ;

	// we render to a display list and use that later for quick drawing, this is
	// the index
	private int worldDisplayListNum;
	private int visibleOresListNum;

	// wheter we need to reload the world
	private boolean needToReloadWorld = false;

	// the width and height of the current screen resolution
	private int screenWidth, screenHeight;

	// the current camera position
	private int currentCameraPosX;
	private int currentCameraPosZ;

	// wheter we show the big map or the mini map
	private boolean mapBig = false;

	// wheter we are done with loading the map data (just for the mini map
	// really)
	private boolean map_load_started = false;

	// the available world numbers
	private ArrayList<WorldInfo> availableWorlds;
	private int selectedWorld;

	// the world chunks we still need to load
	private LinkedList<Block> mapChunksToLoad;

	// the current (selected) world number
	private WorldInfo world = null;

	// the currently pressed key
	private int keyPressed = -1;

	// the current fps we are 'doing'
	private int fps;

	// the laste time fps was updated
	private long lastFpsTime = -1;

	// the number of frames since the last fps update
	private int framesSinceLastFps;

	// the fps display texture
	private Texture fpsTexture;

	// far too many fps calculation variables (copied this from another project)
	public long previousTime;
	public long timeDelta;
	private boolean updateFPSText;
	private long time;

	private boolean[] mineralToggle;
	private Texture[] mineralToggleTextures;

	// lighting on or of (its actually fog, but hey...)
	private boolean lightMode = true;

	// highlight the ores by making them blink
	private boolean highlightOres = true;

	// level info texture
	private boolean levelInfoToggle = false;
	private Texture levelInfoTexture;
	private boolean renderDetailsToggle = true;
	private Texture renderDetailsTexture;
	private int renderDetails_w = 160;
	private int cur_renderDetails_h;

	// light level
	private int[] lightLevelEnd = new int[] { 30, 50, 70, 100, 130 };
	private int[] lightLevelStart = new int[] { 0, 20, 30, 40, 60 };
	private int currentLightLevel = 2;

	// vars to keep track of our current chunk coordinates
	private int cur_chunk_x = 0;
	private int cur_chunk_z = 0;
	private boolean initial_load_done = false;
	private boolean initial_load_queued = false;

	// vars to keep track of how much the camera has moved since our last
	// minimap trim.
	private int total_dX = 0;
	private int total_dZ = 0;
	private int minimap_trim_chunks = 10;
	private int minimap_trim_chunk_distance = 64;

	// How long are we allowed to spend loading chunks before we update?
	private long max_chunkload_time = Sys.getTimerResolution() / 10; // a tenth
																		// of a
																		// second

	// The current camera position that we're at
	private CameraPreset currentPosition;
	private String cameraTextOverride = null;

	private HashMap<KEY_ACTIONS, Integer> key_mapping;
	private SortedProperties xray_properties;

	// lets start with the program
	public static void main(String args[]) {
		new XRay().run();
	}

	// go
	public void run() {
		try {
			// check whether we can access minecraft
			// and if we have worlds to load
			checkMinecraftFiles();

			// Load our preferences (this includes key mappings)
			setPreferenceDefaults();
			loadPreferences();

			// prompt for the resolution and initialize the window
			createWindow();

			// Save any prefs which may have changed
			savePreferences();

			// basic opengl initialization
			initGL();

			// init our program
			initialize();

			// And now load our world
			this.setMinecraftWorld(availableWorlds.get(this.selectedWorld));
			this.triggerChunkLoads();
			
			// Render details
			updateRenderDetails();

			// main loop
			while (!done) {
				long time = Sys.getTime();
				float timeDelta = (time - lastTime) / 1000.0f;
				lastTime = time;

				// handle input given the timedelta (for mouse control)
				handleInput(timeDelta);

				// Load chunks if needed
				if (mapChunksToLoad != null) {
					loadPendingChunks();
				}

				// render whatever we need to render
				render(timeDelta);

				// update our minimap if we need to (new chunks loaded, etc)
				if (minimap_needs_updating) {
					minimapTexture.update();
					minimap_needs_updating = false;
				}

				// Sleep a bit if we're not visible, to save on CPU
				// This is especially important when isVisible() is false,
				// because
				// Display.update() does NOT vSync in that case.
				if (!Display.isVisible()) {
					Thread.sleep(100);
				} else if (!Display.isActive()) {
					Thread.sleep(33);
				}

				// Push to screen
				Display.update();

			}
			// cleanup
			cleanup();
		} catch (Exception e) {
			// bah some error happened
			e.printStackTrace();
			System.exit(0);
		}
	}

	/**
	 * Loads our preferences. This also sets our default keybindings if they're
	 * not overridden somewhere.
	 */
	public void loadPreferences() {
		xray_properties = new SortedProperties();

		// First load our defaults into the prefs object
		for (KEY_ACTIONS action : KEY_ACTIONS.values()) {
			xray_properties.setProperty("KEY_" + action.toString(),
					Keyboard.getKeyName(this.key_mapping.get(action)));
		}

		// Here's where we would load from our prefs file
		File prefs = MineCraftEnvironment.getXrayConfigFile();
		if (prefs.exists() && prefs.canRead()) {
			try {
				xray_properties.load(new FileInputStream(prefs));
			} catch (IOException e) {
				// Just report and continue
				System.out.println("Could not load configuration file: "
						+ e.toString());
			}
		}

		// Loop through the key mappings that we just loaded
		int newkey;
		String prefskey;
		for (KEY_ACTIONS action : KEY_ACTIONS.values()) {
			prefskey = xray_properties.getProperty("KEY_" + action.toString());
			if (prefskey.equalsIgnoreCase("none")) {
				// If the user actually specified "NONE" in the config file,
				// unbind the key
				newkey = Keyboard.KEY_NONE;
			} else {
				newkey = Keyboard.getKeyIndex(prefskey);
				if (newkey == Keyboard.KEY_NONE) {
					// TODO: Should output something more visible to the user
					System.out
							.println("Warning: key '"
									+ prefskey
									+ "' for action "
									+ action
									+ " in the config file is unknown.  Default key assigned.");
					continue;
				}
			}
			this.key_mapping.put(action, newkey);
		}

		// Populate our key ranges
		int i;
		for (i = 0; i < CHUNK_RANGES.length; i++) {
			CHUNK_RANGES_KEYS[i] = this.key_mapping.get(KEY_ACTIONS
					.valueOf("CHUNK_RANGE_" + (i + 1)));
		}
		for (i = 0; i < HIGHLIGHT_RANGES.length; i++) {
			HIGHLIGHT_RANGES_KEYS[i] = this.key_mapping.get(KEY_ACTIONS
					.valueOf("HIGHLIGHT_RANGE_" + (i + 1)));
		}
		for (i = 0; i < HIGHLIGHT_ORES.length; i++) {
			HIGHLIGHT_ORE_KEYS[i] = this.key_mapping.get(KEY_ACTIONS
					.valueOf("TOGGLE_ORE_" + (i + 1)));
		}

		// Populate our list of ores to highlight
		String prefs_highlight;
		String prefs_highlight_key;
		for (i = 0; i < preferred_highlight_ores.length; i++) {
			prefs_highlight_key = "HIGHLIGHT_" + (i + 1);
			prefs_highlight = xray_properties.getProperty(prefs_highlight_key);
			try {
				HIGHLIGHT_ORES[i] = BLOCK.valueOf(prefs_highlight);
			} catch (Exception e) {
				// no worries, just populate with our default
			}
			xray_properties.put(prefs_highlight_key,
					HIGHLIGHT_ORES[i].toString());
		}

		// Save the file immediately, in case we picked up new defaults which
		// weren't present
		// previously
		this.savePreferences();
	}

	/**
	 * Saves our preferences out
	 */
	public void savePreferences() {
		File prefs = MineCraftEnvironment.getXrayConfigFile();
		try {
			xray_properties
					.store(new FileOutputStream(prefs),
							"Feel free to edit.  Use \"NONE\" to disable an action.  Keys taken from http://www.lwjgl.org/javadoc/constant-values.html#org.lwjgl.input.Keyboard.KEY_1");
		} catch (IOException e) {
			// Just report on the console and move on
			System.out.println("Could not save preferences to file: "
					+ e.toString());
		}
	}

	/**
	 * Sets our default preferences
	 */
	public void setPreferenceDefaults() {
		// First do the default key mappings
		key_mapping = new HashMap<KEY_ACTIONS, Integer>();
		for (KEY_ACTIONS action : KEY_ACTIONS.values()) {
			key_mapping.put(action, action.def_key);
		}

		// Then populate our highlight blocks
		for (int i = 0; i < preferred_highlight_ores.length; i++) {
			XRay.HIGHLIGHT_ORES[i] = preferred_highlight_ores[i];
		}
	}

	/**
	 * Loads any pending chunks, but won't exceed max_chunkload_time timer ticks
	 * (unless we're doing the initial load).
	 */
	public void loadPendingChunks() {
		Block b;
		long time = Sys.getTime();
		int total = 0;
		int counter = 0;
		if (!initial_load_done) {
			total = mapChunksToLoad.size();
			setOrthoOn();

			GL11.glDisable(GL11.GL_BLEND);
			GL11.glDisable(GL11.GL_TEXTURE_2D);
			GL11.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
			GL11.glLineWidth(20);

			BufferedImage i = loadingTextTexture.getImage();
			Graphics2D g = i.createGraphics();
			g.setColor(new Color(0f, 0f, 0f, 0f));
			g.setComposite(AlphaComposite.Src);
			g.fillRect(0, 0, i.getWidth(), i.getHeight());
			String statusmessage;
			if (this.cameraTextOverride == null) {
				statusmessage = "Moving camera to " + this.currentPosition.name;
			} else {
				statusmessage = "Moving camera to " + this.cameraTextOverride;
				this.cameraTextOverride = null;
			}
			Rectangle2D bounds = HEADERFONT.getStringBounds(statusmessage,
					g.getFontRenderContext());
			g.setFont(HEADERFONT);
			g.setColor(Color.white);
			g.setRenderingHint(RenderingHints.KEY_TEXT_ANTIALIASING,
					RenderingHints.VALUE_TEXT_ANTIALIAS_ON);
			g.drawString(statusmessage,
					(screenWidth / 2) - ((float) bounds.getWidth() / 2), 40f);
			loadingTextTexture.update();
		}

		// There's various cases where parts of our crosshairs may be covered
		// over by
		// other blocks, or bits of the crosshairs left on the map when
		// wrapping, etc.
		// Whatever.
		boolean got_spawn_chunk = false;
		boolean got_playerpos_chunk = false;
		CameraPreset spawn = level.getSpawnPoint();
		CameraPreset playerpos = level.getPlayerPosition();
		Chunk c;
		while (!mapChunksToLoad.isEmpty()) {
			// Load and draw the chunk
			b = (Block) mapChunksToLoad.pop();
			// System.out.println("Loading chunk " + b.x + "," + b.z);

			// There may be some circumstances where a chunk we're going to load
			// is already loaded.
			// Mostly while moving diagonally, I think. I'm actually not
			// convinced that it's worth
			// checking for, as it doesn't happen TOO often.
			c = level.getChunk(b.x, b.z);
			if (c != null) {
				if (c.x == b.x && c.z == b.z) {
					continue;
				}
			}
			level.loadChunk(b.x, b.z);
			drawChunkToMap(b.x, b.z);
			if (spawn.block.cx == b.x && spawn.block.cz == b.z) {
				got_spawn_chunk = true;
			}
			if (playerpos.block.cx == b.x && playerpos.block.cz == b.z) {
				got_playerpos_chunk = true;
			}

			// Make sure we update the minimap
			minimap_needs_updating = true;

			// Draw a progress bar if we're doing the initial load
			if (!initial_load_done) {
				counter++;
				if (counter % 5 == 0) {
					float progress = ((float) counter / (float) total);

					float bx = 100;
					float ex = screenWidth - 100;
					float by = (screenHeight / 2.0f) - 50;
					float ey = (screenHeight / 2.0f) + 50;

					float px = ((ex - bx) * progress) + bx;

					// progress bar outer box
					GL11.glBegin(GL11.GL_LINE_LOOP);
					GL11.glVertex2f(bx, by);
					GL11.glVertex2f(ex, by);
					GL11.glVertex2f(ex, ey);
					GL11.glVertex2f(bx, ey);
					GL11.glEnd();

					// progress bar 'progress'
					GL11.glBegin(GL11.GL_TRIANGLE_STRIP);
					GL11.glVertex2f(bx, by);
					GL11.glVertex2f(px, by);
					GL11.glVertex2f(bx, ey);
					GL11.glVertex2f(px, ey);
					GL11.glEnd();

					// Draw our message
					GL11.glEnable(GL11.GL_BLEND);
					GL11.glEnable(GL11.GL_TEXTURE_2D);
					SpriteTool.drawSpriteAbsoluteXY(loadingTextTexture, 0f,
							by - 100);
					GL11.glDisable(GL11.GL_BLEND);
					GL11.glDisable(GL11.GL_TEXTURE_2D);
					Display.update();
				}
			} else {
				// Otherwise (if our initial load is done), mark any existing
				// adjacent chunks
				// as dirty so that they re-render. This is needed so that we
				// don't get gaps
				// in our terrain because the adjacent chunks weren't ready yet.
				level.markChunkAsDirty(b.x + 1, b.z);
				level.markChunkAsDirty(b.x - 1, b.z);
				level.markChunkAsDirty(b.x, b.z + 1);
				level.markChunkAsDirty(b.x, b.z - 1);
			}

			// If we've taken too long, break out so the GUI can update
			if (initial_load_done && Sys.getTime() - time > max_chunkload_time) {
				break;
			}
		}
		if (got_spawn_chunk) {
			drawSpawnMarkerToMinimap();
		}
		if (got_playerpos_chunk) {
			drawPlayerposMarkerToMinimap();
		}
		if (!initial_load_done) {
			GL11.glEnable(GL11.GL_BLEND);
			GL11.glEnable(GL11.GL_TEXTURE_2D);
			setOrthoOff();
		}
		initial_load_done = true;
	}

	public void incLightLevel() {
		this.currentLightLevel++;
		if (this.currentLightLevel >= this.lightLevelStart.length) {
			this.currentLightLevel = this.lightLevelStart.length - 1;
		}
	}

	public void decLightLevel() {
		this.currentLightLevel--;
		if (this.currentLightLevel <= 0) {
			this.currentLightLevel = 0;
		}
	}

	public void setLightLevel() {
		this.setLightLevel(0);
	}

	public void setLightLevel(int diff) {
		int min = this.lightLevelStart[this.currentLightLevel];
		int max = this.lightLevelEnd[this.currentLightLevel];

		min = min + diff;
		max = max + diff;

		if (min <= 0) {
			min = 0;
		}
		if (max <= 0) {
			max = 0;
		}

		GL11.glFogf(GL11.GL_FOG_START, min);
		GL11.glFogf(GL11.GL_FOG_END, max);
	}

	/***
	 * Initialize the basic openGL environment
	 */
	private void initGL() {
		GL11.glEnable(GL11.GL_TEXTURE_2D); // Enable Texture Mapping
		GL11.glShadeModel(GL11.GL_FLAT); // Disable Smooth Shading
		GL11.glClearColor(0.0f, 0.3f, 1.0f, 0.3f); // Blue Background
		GL11.glClearDepth(1.0); // Depth Buffer Setup
		GL11.glEnable(GL11.GL_DEPTH_TEST); // Enables Depth Testing
		GL11.glDepthFunc(GL11.GL_LEQUAL); // The Type Of Depth Testing To Do
		// GL11.glDepthFunc(GL11.GL_ALWAYS);

		GL11.glEnable(GL11.GL_BLEND);
		GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
		// GL11.glBlendFunc(GL11.GL_ONE, GL11.GL_ONE);

		GL11.glMatrixMode(GL11.GL_PROJECTION); // Select The Projection Matrix
		GL11.glLoadIdentity(); // Reset The Projection Matrix

		// Calculate The Aspect Ratio Of The Window
		GLU.gluPerspective(90.0f, (float) displayMode.getWidth()
				/ (float) displayMode.getHeight(), 0.1f, 400.0f);
		GL11.glMatrixMode(GL11.GL_MODELVIEW); // Select The Modelview Matrix

		// Really Nice Perspective Calculations
		GL11.glHint(GL11.GL_PERSPECTIVE_CORRECTION_HINT, GL11.GL_NICEST);

		GL11.glDisable(GL11.GL_FOG);
		GL11.glFogi(GL11.GL_FOG_MODE, GL11.GL_LINEAR);
		float[] color = new float[] { 0.0f, 0.3f, 1.0f, 0.3f };
		ByteBuffer colorBytes = ByteBuffer.allocateDirect(64);
		FloatBuffer colorBuffer = colorBytes.asFloatBuffer();
		colorBuffer.rewind();
		colorBuffer.put(color);
		colorBuffer.rewind();
		GL11.glFog(GL11.GL_FOG_COLOR, colorBytes.asFloatBuffer());
		GL11.glFogf(GL11.GL_FOG_DENSITY, 0.3f);
		GL11.glHint(GL11.GL_FOG_HINT, GL11.GL_NICEST);
		setLightLevel();

	}

	/***
	 * Load textures init precalc tables determine available worlds init misc
	 * variables
	 */
	private void initialize() {
		// init the precalc tables

		mineralToggle = new boolean[HIGHLIGHT_ORES.length];
		mineralToggleTextures = new Texture[HIGHLIGHT_ORES.length];

		// world display list
		worldDisplayListNum = GL11.glGenLists(1);
		visibleOresListNum = GL11.glGenLists(1);

		// camera
		camera = new FirstPersonCameraController(0, 0, 0);

		// textures
		try {
			// ui textures
			minimapTexture = TextureTool.allocateTexture(minimap_dim,
					minimap_dim);
			minimapGraphics = minimapTexture.getImage().createGraphics();
			minimapArrowTexture = TextureTool.allocateTexture(32, 32);
			fpsTexture = TextureTool.allocateTexture(128, 32);
			levelInfoTexture = TextureTool.allocateTexture(128, 144);
			loadingTextTexture = TextureTool.allocateTexture(screenWidth, 50);
			renderDetailsTexture = TextureTool.allocateTexture(256, 256);

			createMinimapSprites();

			// minecraft textures
			BufferedImage minecraftTextureImage = MineCraftEnvironment
					.getMinecraftTexture();
			minecraftTexture = TextureTool.allocateTexture(
					minecraftTextureImage, GL11.GL_NEAREST);
			minecraftTexture.update();

			// painting textures
			BufferedImage minecraftPaintingImage = MineCraftEnvironment
					.getMinecraftPaintings();
			paintingTexture = TextureTool.allocateTexture(
					minecraftPaintingImage, GL11.GL_NEAREST);
			paintingTexture.update();

			// Nether portal texture to use for drawing those, since there's no
			// actual texture for it
			portalTexture = TextureTool.allocateTexture(16, 16);
			BufferedImage bi = portalTexture.getImage();
			Graphics2D pg = bi.createGraphics();
			pg.setColor(new Color(.839f, .203f, .952f, .4f));
			pg.fill(new Rectangle(0, 0, 16, 16));
			pg.drawImage(bi, null, 0, 0);
			portalTexture.update();

			// mineral textures
			for (int i = 0; i < HIGHLIGHT_ORES.length; i++) {
				mineralToggleTextures[i] = TextureTool.allocateTexture(128, 32);
				Graphics2D g = mineralToggleTextures[i].getImage()
						.createGraphics();
				g.setFont(ARIALFONT);
				g.setColor(Color.white);
				g.drawString("[F" + (i + 1) + "] " + HIGHLIGHT_ORES[i].name,
						10, 16);
				mineralToggleTextures[i].update();
			}

		} catch (IOException e1) {
			// TODO Auto-generated catch block
			e1.printStackTrace();
		}

		// level data
		levelBlockX = Integer.MIN_VALUE;
		levelBlockZ = Integer.MIN_VALUE;

		// set mouse grabbed so we can get x/y coordinates
		Mouse.setGrabbed(true);
	}

	private BufferedImage resizeImage(Image baseImage, int newWidth,
			int newHeight) {
		BufferedImage newImage = new BufferedImage(newWidth, newHeight,
				BufferedImage.TYPE_4BYTE_ABGR);
		Graphics2D g = newImage.createGraphics();
		g.drawImage(baseImage, 0, 0, newWidth, newHeight, null);

		return newImage;
	}

	private byte[] convertIcon(byte[] icon) {
		byte[] newIcon = new byte[icon.length];
		for (int i = 0; i < newIcon.length; i += 4) {
			newIcon[i + 3] = icon[i + 0];
			newIcon[i + 2] = icon[i + 1];
			newIcon[i + 1] = icon[i + 2];
			newIcon[i + 0] = icon[i + 3];
		}

		return newIcon;
	}

	/***
	 * Creates the window and initializes the lwjgl display object
	 * 
	 * @throws Exception
	 */
	private void createWindow() throws Exception {

		// set icon buffers
		// stupid conversions needed
		File iconFile = new File("xray_icon.png");
		ByteBuffer[] icons = null;
		if (iconFile.exists() || iconFile.canRead()) {
			BufferedImage iconTexture128 = ImageIO.read(iconFile);
			iconTexture128 = resizeImage(iconTexture128, 128, 128); // just to
																	// be sure
																	// all icons
																	// are the
																	// same
																	// imagetype
			BufferedImage iconTexture64 = resizeImage(iconTexture128, 64, 64);
			BufferedImage iconTexture32 = resizeImage(iconTexture128, 32, 32);
			BufferedImage iconTexture16 = resizeImage(iconTexture128, 16, 16);

			byte[] iconBuffer128d = ((DataBufferByte) iconTexture128
					.getRaster().getDataBuffer()).getData();
			byte[] iconBuffer64d = ((DataBufferByte) iconTexture64.getRaster()
					.getDataBuffer()).getData();
			byte[] iconBuffer32d = ((DataBufferByte) iconTexture32.getRaster()
					.getDataBuffer()).getData();
			byte[] iconBuffer16d = ((DataBufferByte) iconTexture16.getRaster()
					.getDataBuffer()).getData();

			iconBuffer128d = convertIcon(iconBuffer128d); // LWJGL (opengl?)
															// needs RGBA ...
															// imagetype
															// available is ABGR
			iconBuffer64d = convertIcon(iconBuffer64d);
			iconBuffer32d = convertIcon(iconBuffer32d);
			iconBuffer16d = convertIcon(iconBuffer16d);

			ByteBuffer iconBuffer128 = ByteBuffer.wrap(iconBuffer128d);
			ByteBuffer iconBuffer64 = ByteBuffer.wrap(iconBuffer64d);
			ByteBuffer iconBuffer32 = ByteBuffer.wrap(iconBuffer32d);
			ByteBuffer iconBuffer16 = ByteBuffer.wrap(iconBuffer16d);

			iconBuffer128.rewind();
			iconBuffer64.rewind();
			iconBuffer32.rewind();
			iconBuffer16.rewind();

			icons = new ByteBuffer[] { iconBuffer128, iconBuffer64,
					iconBuffer32, iconBuffer16 };

			ResolutionDialog.iconImage = iconTexture128;
		}

		// We loop on this dialog "forever" because
		while (true) {
			if (ResolutionDialog.presentDialog(windowTitle, availableWorlds,
					(Properties) xray_properties) == ResolutionDialog.DIALOG_BUTTON_EXIT) {
				System.exit(0);
			}

			// Mark which world to load (which will happen later during
			// initialize()
			this.selectedWorld = ResolutionDialog.selectedWorld;

			// The last option will always be "Other..." If that's been chosen,
			// open a chooser dialog.
			if (this.selectedWorld == availableWorlds.size() - 1) {
				JFileChooser chooser = new JFileChooser();
				chooser.setFileHidingEnabled(false);
				chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
				if (xray_properties.getProperty("LAST_WORLD") != null) {
					chooser.setCurrentDirectory(new File(xray_properties
							.getProperty("LAST_WORLD")));
				} else {
					chooser.setCurrentDirectory(new File("."));
				}
				chooser.setDialogTitle("Select a Minecraft World Directory");
				if (chooser.showOpenDialog(null) == JFileChooser.APPROVE_OPTION) {
					WorldInfo customWorld = availableWorlds
							.get(this.selectedWorld);
					customWorld.setBasePath(chooser.getSelectedFile()
							.getCanonicalPath());
					File leveldat = customWorld.getLevelDatFile();
					if (leveldat.exists() && leveldat.canRead()) {
						// We appear to have a valid level; break and continue.
						break;
					} else {
						// Invalid, show an error and then re-open the main
						// dialog.
						JOptionPane
								.showMessageDialog(
										null,
										"Couldn't find a valid level.dat file for the specified directory",
										"Minecraft XRAY error",
										JOptionPane.ERROR_MESSAGE);
					}
				}
			} else {
				// We chose one of the auto-detected worlds, continue.
				break;
			}
		}

		// Update our preferences
		this.xray_properties.setProperty("LAST_WORLD",
				availableWorlds.get(this.selectedWorld).getBasePath());

		// set fullscreen from the dialog
		fullscreen = ResolutionDialog.selectedFullScreenValue;

		if (icons != null)
			Display.setIcon(icons);

		// Display.setIcon();
		Display.setFullscreen(fullscreen);
		displayMode = ResolutionDialog.selectedDisplayMode;
		Display.setDisplayMode(displayMode);
		Display.setTitle(windowTitle);
		// TODO: actually do what the user requests here
		Display.setVSyncEnabled(true);
		Display.create();
		screenWidth = displayMode.getWidth();
		screenHeight = displayMode.getHeight();
	}

	/***
	 * Checks for sanity of the minecraft environment
	 */
	private void checkMinecraftFiles() {
		if (MineCraftEnvironment.getMinecraftDirectory() == null) {
			JOptionPane.showMessageDialog(null,
					"OS not supported (" + System.getProperty("os.name")
							+ "), please report.", "Minecraft XRAY error",
					JOptionPane.ERROR_MESSAGE);
			System.exit(0);
		}
		if (!MineCraftEnvironment.getMinecraftDirectory().exists()) {
			JOptionPane.showMessageDialog(null,
					"Minecraft directory not found: "
							+ MineCraftEnvironment.getMinecraftDirectory()
									.getAbsolutePath(), "Minecraft XRAY error",
					JOptionPane.ERROR_MESSAGE);
			System.exit(0);
		}
		if (!MineCraftEnvironment.getMinecraftDirectory().canRead()) {
			JOptionPane.showMessageDialog(null,
					"Minecraft directory not readable: "
							+ MineCraftEnvironment.getMinecraftDirectory()
									.getAbsolutePath(), "Minecraft XRAY error",
					JOptionPane.ERROR_MESSAGE);
			System.exit(0);
		}

		availableWorlds = MineCraftEnvironment.getAvailableWorlds();
		// Add in a custom "Other..." world
		availableWorlds.add(new WorldInfo(true));

		// Since we're adding our custom world, this'll actually never get hit.
		// Ah well.
		if (availableWorlds.size() == 0) {
			JOptionPane
					.showMessageDialog(
							null,
							"Minecraft directory found, but no minecraft levels available.",
							"Minecraft XRAY error", JOptionPane.ERROR_MESSAGE);
			System.exit(0);
		}
	}

	private void setChunkRange(int n) {
		if (n >= CHUNK_RANGES.length)
			n = CHUNK_RANGES.length - 1;
		if (n <= 0)
			n = 0;
		if (n == currentChunkRange) {
			return;
		}
		this.currentChunkRange = n;
		this.visible_chunk_range = CHUNK_RANGES[n];
		this.needToReloadWorld = true;
	}

	private void setHighlightRange(int n) {
		if (n >= HIGHLIGHT_RANGES.length)
			n = HIGHLIGHT_RANGES.length - 1;
		if (n <= 0)
			n = 0;
		if (n == currentHighlightDistance) {
			return;
		}
		this.currentHighlightDistance = n;
	}

	/***
	 * Sets the world number we want to view
	 * 
	 * @param world
	 */
	private void setMinecraftWorld(WorldInfo world) {
		this.world = world;
		this.level = new MinecraftLevel(world, minecraftTexture,
				paintingTexture, portalTexture, HIGHLIGHT_ORES);

		// determine which chunks are available in this world
		mapChunksToLoad = new LinkedList<Block>();

		moveCameraToPlayerPos();
	}

	/**
	 * Sets the world number we want, and moves the camera to the specified
	 * coordinates. There's a bit of code duplication going on here; should fix
	 * that.
	 * 
	 * @param world
	 * @param camera_x
	 * @param camera_z
	 */
	private void setMinecraftWorld(WorldInfo world,
			FirstPersonCameraController camera) {
		this.world = world;
		this.level = new MinecraftLevel(world, minecraftTexture,
				paintingTexture, portalTexture, HIGHLIGHT_ORES);

		// determine which chunks are available in this world
		mapChunksToLoad = new LinkedList<Block>();

		this.camera = camera;
		initial_load_queued = false;
		initial_load_done = false;
		this.removeChunklistFromMap(level.removeAllChunksFromMinimap());
		this.triggerChunkLoads();

	}

	private void moveCameraToPosition(CameraPreset playerPos) {
		this.camera.getPosition().set(playerPos.block.x, playerPos.block.y,
				playerPos.block.z);
		this.camera.setYawAndPitch(180 + playerPos.yaw, playerPos.pitch);
		initial_load_queued = false;
		initial_load_done = false;
		this.removeChunklistFromMap(level.removeAllChunksFromMinimap());
		this.triggerChunkLoads();
		this.currentPosition = playerPos;
	}

	private void moveCameraToSpawnPoint() {
		this.moveCameraToPosition(level.getSpawnPoint());
	}

	private void moveCameraToPlayerPos() {
		this.moveCameraToPosition(level.getPlayerPosition());
	}

	private void moveCameraToNextPlayer() {
		this.moveCameraToPosition(level
				.getNextPlayerPosition(this.currentPosition));
	}

	private void moveCameraToPreviousPlayer() {
		this.moveCameraToPosition(level
				.getPrevPlayerPosition(this.currentPosition));
	}

	/**
	 * Populates mapChunksToLoad with a list of chunks that need adding, based
	 * on how far we've moved since our last known position. Realistically this
	 * is never going to be more than one line at a time, though if someone's
	 * getting hit with ridiculously low FPS or something, perhaps there could
	 * end up being more.
	 */
	private void triggerChunkLoads() {
		int chunkX = level.getChunkX((int) -camera.getPosition().x);
		int chunkZ = level.getChunkZ((int) -camera.getPosition().z);

		if (initial_load_queued) {
			Chunk tempchunk;
			int dx = chunkX - cur_chunk_x;
			int dz = chunkZ - cur_chunk_z;

			int top_x = 0;
			int bot_x = 0;
			int top_z = 0;
			int bot_z = 0;

			// X
			if (dx < 0) {
				// System.out.println("Loading in chunks from the X range " +
				// (cur_chunk_x-1-loadChunkRange) + " to " +
				// (chunkX-loadChunkRange) + " (going down)");
				top_x = cur_chunk_x - 1 - loadChunkRange;
				bot_x = chunkX - loadChunkRange;
			} else if (dx > 0) {
				// System.out.println("Loading in chunks from the X range " +
				// (cur_chunk_x+1+loadChunkRange) + " to " +
				// (chunkX+loadChunkRange) + " (going up)");
				top_x = chunkX + loadChunkRange;
				bot_x = cur_chunk_x + 1 + loadChunkRange;
			}
			if (dx != 0) {
				for (int lx = bot_x; lx <= top_x; lx++) {
					for (int lz = chunkZ - loadChunkRange; lz <= chunkZ
							+ loadChunkRange; lz++) {
						tempchunk = level.getChunk(lx, lz);
						if (tempchunk != null) {
							if (tempchunk.x == lx && tempchunk.z == lz) {
								if (!tempchunk.isOnMinimap) {
									drawChunkToMap(tempchunk.x, tempchunk.z);
									// minimap_changed = true;
								}
								continue;
							}
							level.clearChunk(lx, lz);
						}
						mapChunksToLoad.add(new Block(lx, 0, lz));
					}
				}
			}

			// Z
			if (dz < 0) {
				// System.out.println("Loading in chunks from the Z range " +
				// (cur_chunk_z-1-loadChunkRange) + " to " +
				// (chunkZ-loadChunkRange) + " (going down)");
				top_z = cur_chunk_z - 1 - loadChunkRange;
				bot_z = chunkZ - loadChunkRange;
			} else if (dz > 0) {
				// System.out.println("Loading in chunks from the Z range " +
				// (cur_chunk_z+1+loadChunkRange) + " to " +
				// (chunkZ+loadChunkRange) + " (going up)");
				top_z = chunkZ + loadChunkRange;
				bot_z = cur_chunk_z + 1 + loadChunkRange;
			}
			if (dz != 0) {
				for (int lx = chunkX - loadChunkRange; lx <= chunkX
						+ loadChunkRange; lx++) {
					for (int lz = bot_z; lz <= top_z; lz++) {
						tempchunk = level.getChunk(lx, lz);
						if (tempchunk != null) {
							if (tempchunk.x == lx && tempchunk.z == lz) {
								if (!tempchunk.isOnMinimap) {
									drawChunkToMap(tempchunk.x, tempchunk.z);
									// minimap_changed = true;
								}
								continue;
							}
							level.clearChunk(lx, lz);
						}
						mapChunksToLoad.add(new Block(lx, 0, lz));
					}
				}
			}

			// Figure out if we need to trim our minimap (to prevent wrapping
			// around)
			total_dX += dx;
			total_dZ += dz;
			ArrayList<Chunk> trimList = new ArrayList<Chunk>();
			int i;
			if (Math.abs(total_dX) >= minimap_trim_chunks) {
				if (total_dX < 0) {
					// System.out.println("Clearing X from " +
					// (chunkX-minimap_trim_chunk_distance+minimap_trim_chunks)
					// + " to " + (chunkX-minimap_trim_chunk_distance));
					for (i = chunkX - minimap_trim_chunk_distance
							+ minimap_trim_chunks; i >= chunkX
							- minimap_trim_chunk_distance; i--) {
						trimList.addAll(level.removeChunkRowXFromMinimap(i));
					}
					total_dX = -(Math.abs(total_dX) % minimap_trim_chunks);
				} else {
					// System.out.println("Clearing X from " +
					// (chunkX+minimap_trim_chunk_distance-minimap_trim_chunks)
					// + " to " + (chunkX+minimap_trim_chunk_distance));
					for (i = chunkX + minimap_trim_chunk_distance
							- minimap_trim_chunks; i <= chunkX
							+ minimap_trim_chunk_distance; i++) {
						trimList.addAll(level.removeChunkRowXFromMinimap(i));
					}
					total_dX = total_dX % minimap_trim_chunks;
				}
			}
			if (Math.abs(total_dZ) >= minimap_trim_chunks) {
				if (total_dZ < 0) {
					// System.out.println("Clearing Z from " +
					// (chunkZ-minimap_trim_chunk_distance+minimap_trim_chunks)
					// + " to " + (chunkZ-minimap_trim_chunk_distance));
					for (i = chunkZ - minimap_trim_chunk_distance
							+ minimap_trim_chunks; i >= chunkZ
							- minimap_trim_chunk_distance; i--) {
						trimList.addAll(level.removeChunkRowZFromMinimap(i));
					}
					total_dZ = -(Math.abs(total_dZ) % minimap_trim_chunks);
				} else {
					// System.out.println("Clearing Z from " +
					// (chunkZ+minimap_trim_chunk_distance-minimap_trim_chunks)
					// + " to " + (chunkZ+minimap_trim_chunk_distance));
					for (i = chunkZ + minimap_trim_chunk_distance
							- minimap_trim_chunks; i <= chunkZ
							+ minimap_trim_chunk_distance; i++) {
						trimList.addAll(level.removeChunkRowZFromMinimap(i));
					}
					total_dZ = total_dZ % minimap_trim_chunks;
				}
			}

			removeChunklistFromMap(trimList);
		} else {
			// System.out.println("Loading world from X: " +
			// (chunkX-loadChunkRange) + " - " + (chunkX+loadChunkRange) +
			// ", Z: " + (chunkZ-loadChunkRange) + " - " +
			// (chunkZ+loadChunkRange));
			for (int lx = chunkX - loadChunkRange; lx <= chunkX
					+ loadChunkRange; lx++) {
				for (int lz = chunkZ - loadChunkRange; lz <= chunkZ
						+ loadChunkRange; lz++) {
					level.clearChunk(lx, lz);
					mapChunksToLoad.add(new Block(lx, 0, lz));
				}
			}
			initial_load_queued = true;
		}
		cur_chunk_x = chunkX;
		cur_chunk_z = chunkZ;
	}

	/***
	 * handles all input on all screens
	 * 
	 * @param timeDelta
	 */
	private void handleInput(float timeDelta) {

		int key;

		// distance in mouse movement from the last getDX() call.
		mouseX = Mouse.getDX();
		// distance in mouse movement from the last getDY() call.
		mouseY = Mouse.getDY();

		// we are on the main world screen or the level loading screen
		// update the camera (but only if the mouse is grabbed)
		if (Mouse.isGrabbed()) {
			camera.incYaw(mouseX * MOUSE_SENSITIVITY);
			camera.incPitch(-mouseY * MOUSE_SENSITIVITY);
		}

		//
		// Keyboard commands (well, and mouse presses)
		//

		// Speed shifting
		if (Mouse.isButtonDown(0)
				|| Keyboard.isKeyDown(key_mapping
						.get(KEY_ACTIONS.SPEED_INCREASE))) {
			MOVEMENT_SPEED = 30.0f;
		} else if (Mouse.isButtonDown(1)
				|| Keyboard.isKeyDown(key_mapping
						.get(KEY_ACTIONS.SPEED_DECREASE))) {
			MOVEMENT_SPEED = 3.0f;
		} else {
			MOVEMENT_SPEED = 10.0f;
		}

		// Move forward
		if (Keyboard.isKeyDown(key_mapping.get(KEY_ACTIONS.MOVE_FORWARD))) {
			camera.walkForward(MOVEMENT_SPEED * timeDelta, camera_lock);
			triggerChunkLoads();
		}

		// Move backwards
		if (Keyboard.isKeyDown(key_mapping.get(KEY_ACTIONS.MOVE_BACKWARD))) {
			camera.walkBackwards(MOVEMENT_SPEED * timeDelta, camera_lock);
			triggerChunkLoads();
		}

		// Strafe Left
		if (Keyboard.isKeyDown(key_mapping.get(KEY_ACTIONS.MOVE_LEFT))) {
			camera.strafeLeft(MOVEMENT_SPEED * timeDelta);
			triggerChunkLoads();
		}

		// Strafe right
		if (Keyboard.isKeyDown(key_mapping.get(KEY_ACTIONS.MOVE_RIGHT))) {
			camera.strafeRight(MOVEMENT_SPEED * timeDelta);
			triggerChunkLoads();
		}

		// Fly Up
		if (Keyboard.isKeyDown(key_mapping.get(KEY_ACTIONS.MOVE_UP))) {
			camera.moveUp(MOVEMENT_SPEED * timeDelta);
			triggerChunkLoads();
		}

		// Fly Down
		if (Keyboard.isKeyDown(key_mapping.get(KEY_ACTIONS.MOVE_DOWN))) {
			camera.moveUp(-MOVEMENT_SPEED * timeDelta);
			triggerChunkLoads();
		}

		// Toggle minimap/largemap
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_MINIMAP);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			mapBig = !mapBig;
			keyPressed = key;
		}

		// Toggle highlightable ores
		needToReloadWorld = false;
		for (int i = 0; i < mineralToggle.length; i++) {
			if (Keyboard.isKeyDown(HIGHLIGHT_ORE_KEYS[i])
					&& keyPressed != HIGHLIGHT_ORE_KEYS[i]) {
				keyPressed = HIGHLIGHT_ORE_KEYS[i];
				mineralToggle[i] = !mineralToggle[i];
				needToReloadWorld = true;
			}
		}
		if (needToReloadWorld) {
			invalidateSelectedChunks();
		}

		// Fullscreen
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_FULLSCREEN);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			switchFullScreenMode();
		}

		// Toggle fullbright
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_FULLBRIGHT);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			setLightMode(!lightMode);
			updateRenderDetails();
		}

		// Toggle ore highlighting
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_ORE_HIGHLIGHTING);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			highlightOres = !highlightOres;
			updateRenderDetails();
		}

		// Move camera to spawn point
		key = key_mapping.get(KEY_ACTIONS.MOVE_TO_SPAWN);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			moveCameraToSpawnPoint();
		}

		// Move camera to player position
		key = key_mapping.get(KEY_ACTIONS.MOVE_TO_PLAYER);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			moveCameraToPlayerPos();
		}

		// Switch to the next available camera preset
		key = key_mapping.get(KEY_ACTIONS.MOVE_NEXT_CAMERAPOS);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			moveCameraToNextPlayer();
		}

		// Switch to the previous camera preset
		key = key_mapping.get(KEY_ACTIONS.MOVE_PREV_CAMERAPOS);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			moveCameraToPreviousPlayer();
		}

		// Increase light level
		key = key_mapping.get(KEY_ACTIONS.LIGHT_INCREASE);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			incLightLevel();
			updateRenderDetails();
		}

		// Decrease light level
		key = key_mapping.get(KEY_ACTIONS.LIGHT_DECREASE);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			decLightLevel();
			updateRenderDetails();
		}

		// Toggle position info popup
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_POSITION_INFO);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			levelInfoToggle = !levelInfoToggle;
		}

		// Toggle rendering info popup
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_RENDER_DETAILS);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			renderDetailsToggle = !renderDetailsToggle;
		}
		
		// Toggle bedrock rendering
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_BEDROCK);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			render_bedrock = !render_bedrock;
			invalidateSelectedChunks(true);
			updateRenderDetails();
		}

		// Toggle explored-area highlighting
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_HIGHLIGHT_EXPLORED);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			highlight_explored = !highlight_explored;
			invalidateSelectedChunks(true);
			updateRenderDetails();
		}

		// Toggle water rendering
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_WATER);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			render_water = !render_water;
			invalidateSelectedChunks(true);
			updateRenderDetails();
		}

		// Toggle camera lock
		key = key_mapping.get(KEY_ACTIONS.TOGGLE_CAMERA_LOCK);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			camera_lock = !camera_lock;
		}

		// Toggle between Nether and Overworld
		key = key_mapping.get(KEY_ACTIONS.SWITCH_NETHER);
		if (Keyboard.isKeyDown(key) && keyPressed != key) {
			keyPressed = key;
			switchNether();
		}

		// Temp routine to write the minimap out to a PNG (for debugging
		// purposes)
		/*
		 * if (Keyboard.isKeyDown(Keyboard.KEY_P) && keyPressed !=
		 * Keyboard.KEY_P) { keyPressed = Keyboard.KEY_P; BufferedImage bi =
		 * minimapTexture.getImage(); try { ImageIO.write(bi, "PNG", new
		 * File("/home/pez/xray.png"));
		 * System.out.println("Wrote minimap to disk."); } catch (Exception e) {
		 * // whatever } }
		 */

		// Handle changing chunk ranges (how far out we draw from the camera
		for (int i = 0; i < CHUNK_RANGES.length; i++) {
			if (Keyboard.isKeyDown(CHUNK_RANGES_KEYS[i])
					&& keyPressed != CHUNK_RANGES_KEYS[i]) {
				keyPressed = CHUNK_RANGES_KEYS[i];
				setChunkRange(i);
				updateRenderDetails();
			}
		}

		// Handle changing the ore highlight distances
		for (int i = 0; i < HIGHLIGHT_RANGES.length; i++) {
			if (Keyboard.isKeyDown(HIGHLIGHT_RANGES_KEYS[i])
					&& keyPressed != HIGHLIGHT_RANGES_KEYS[i]) {
				keyPressed = HIGHLIGHT_RANGES_KEYS[i];
				setHighlightRange(i);
				updateRenderDetails();
			}
		}

		// Release the mouse
		if (Keyboard.isKeyDown(key_mapping.get(KEY_ACTIONS.RELEASE_MOUSE))) {
			Mouse.setGrabbed(false);
		}

		// Grab the mouse on a click
		if (Mouse.isButtonDown(0)) {
			Mouse.setGrabbed(true);
		}

		// Quit
		if (Keyboard.isKeyDown(key_mapping.get(KEY_ACTIONS.QUIT))
				&& Keyboard.isKeyDown(Keyboard.KEY_LCONTROL)) {
			done = true;
		}

		// Handle a requested window close
		if (Display.isCloseRequested()) {
			done = true;
		}

		// Clear out our keyPressed var if it's improperly-set
		if (keyPressed != -1) {
			if (!Keyboard.isKeyDown(keyPressed)) {
				keyPressed = -1;
			}
		}
	}

	/**
	 * If we can, switches to/from nether. This will attempt to do an
	 * approximate translation of your position, though that hasn't been tested
	 * much, and won't totally line up with what Minecraft does. Note that
	 * height is unaffected by this, so the adjacent portal might show up higher
	 * or lower, depending on the local terrain.
	 */
	private void switchNether() {
		WorldInfo newworld = null;
		float camera_mult = 1.0f;
		if (world.isNether() && world.hasOverworld()) {
			this.cameraTextOverride = "equivalent Overworld location (approx.)";
			newworld = world.getOverworldInfo();
			camera_mult = 8.0f;
		} else if (!world.isNether() && world.hasNether()) {
			this.cameraTextOverride = "equivalent Nether location (approx.)";
			newworld = world.getNetherInfo();
			camera_mult = 1.0f / 8.0f;
		}
		if (newworld != null) {
			// A full reinitialization is kind of overkill, but whatever.
			FirstPersonCameraController cur_camera = this.camera;
			this.camera.processNetherWarp(camera_mult);
			initialize();
			this.setMinecraftWorld(newworld, cur_camera);
			this.triggerChunkLoads();
		}
	}

	private void invalidateSelectedChunks() {
		level.invalidateSelected(false);
	}

	private void invalidateSelectedChunks(boolean main_dirty) {
		level.invalidateSelected(main_dirty);
	}

	private void setLightMode(boolean lightMode) {
		this.lightMode = lightMode;
		if (lightMode) {
			GL11.glClearColor(0.0f, 0.0f, 0.0f, 0.0f); // Black Background
			GL11.glEnable(GL11.GL_FOG);
		} else {
			GL11.glClearColor(0.0f, 0.3f, 1.0f, 0.3f); // Blue Background
			GL11.glDisable(GL11.GL_FOG);
		}
	}

	/***
	 * Switches full screen mode
	 */
	private void switchFullScreenMode() {
		fullscreen = !fullscreen;
		try {
			Display.setFullscreen(fullscreen);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/***
	 * Draw the spawn position to the minimap
	 */
	private void drawSpawnMarkerToMinimap() {
		Graphics2D g = minimapGraphics;

		CameraPreset spawn = level.getSpawnPoint();
		int sy = getMinimapBaseY(spawn.block.cx) - (spawn.block.x % 16);
		int sx = (getMinimapBaseX(spawn.block.cz) + (spawn.block.z % 16))
				% minimap_dim;

		g.setStroke(new BasicStroke(2));
		g.setColor(Color.red.brighter());
		g.drawOval(sx - 6, sy - 6, 11, 11);
		g.drawLine(sx - 8, sy, sx + 8, sy);
		g.drawLine(sx, sy - 8, sx, sy + 8);
		minimapTexture.update();
	}

	/***
	 * Draw the current position to the minimap
	 */
	private void drawPlayerposMarkerToMinimap() {
		Graphics2D g = minimapGraphics;

		CameraPreset player = level.getPlayerPosition();
		int py = getMinimapBaseY(player.block.cx) - (player.block.x % 16);
		int px = getMinimapBaseX(player.block.cz) + (player.block.z % 16);

		g.setStroke(new BasicStroke(2));
		g.setColor(Color.yellow.brighter());
		g.drawOval(px - 6, py - 6, 11, 11);
		g.drawLine(px - 8, py, px + 8, py);
		g.drawLine(px, py - 8, px, py + 8);
		minimapTexture.update();
	}

	/***
	 * Main render loop
	 * 
	 * @param timeDelta
	 * @return
	 */
	private boolean render(float timeDelta) {
		// GL11.glLoadIdentity();
		GL11.glLoadIdentity();
		GL11.glClear(GL11.GL_COLOR_BUFFER_BIT | GL11.GL_DEPTH_BUFFER_BIT); // Clear
																			// The
																			// Screen
																			// And
																			// The
																			// Depth
																			// Buffer

		// are we still loading the map?
		if (!map_load_started) {
			map_load_started = true;
			// drawMapMarkersToMinimap();
			// minimapTexture.update();
			setLightMode(true); // basically enable fog etc
		}

		// we are viewing a world
		GL11.glPushMatrix();

		// change the camera to point a the right direction
		camera.applyCameraTransformation();

		currentCameraPosX = (int) -camera.getPosition().x;
		currentCameraPosZ = (int) -camera.getPosition().z;

		// determine if we need to load new map chunks
		if (currentCameraPosX != levelBlockX
				|| currentCameraPosZ != levelBlockZ || needToReloadWorld) {
			levelBlockX = currentCameraPosX;
			levelBlockZ = currentCameraPosZ;
			currentLevelX = level.getChunkX(levelBlockX);
			currentLevelZ = level.getChunkZ(levelBlockZ);
		}

		// draw the visible world
		int chunk_range = visible_chunk_range;
		if (HIGHLIGHT_RANGES[currentHighlightDistance] < chunk_range) {
			chunk_range = HIGHLIGHT_RANGES[currentHighlightDistance];
		}

		GL11.glEnable(GL11.GL_TEXTURE_2D);
		GL11.glColor3f(1.0f, 1.0f, 1.0f);
		minecraftTexture.bind();
		for (int lx = currentLevelX - visible_chunk_range; lx < currentLevelX
				+ visible_chunk_range; lx++) {
			for (int lz = currentLevelZ - visible_chunk_range; lz < currentLevelZ
					+ visible_chunk_range; lz++) {
				Chunk k = level.getChunk(lx, lz);

				if (k != null) {
					k.renderSolid(render_bedrock, render_water,
							highlight_explored);
					k.renderSelected(this.mineralToggle);
					paintingTexture.bind();
					k.renderPaintings();
					minecraftTexture.bind();
				}
			}
		}
		for (int lx = currentLevelX - visible_chunk_range; lx < currentLevelX
				+ visible_chunk_range; lx++) {
			for (int lz = currentLevelZ - visible_chunk_range; lz < currentLevelZ
					+ visible_chunk_range; lz++) {
				Chunk k = level.getChunk(lx, lz);

				if (k != null)
					k.renderTransparency();
			}
		}

		if (highlightOres) {

			GL11.glDisable(GL11.GL_DEPTH_TEST);
			long time = System.currentTimeMillis();
			float alpha = (time % 1000) / 1000.0f;
			if (time % 2000 > 1000)
				alpha = 1.0f - alpha;
			alpha = 0.1f + (alpha * 0.8f);
			GL11.glColor4f(alpha, alpha, alpha, alpha);
			setLightLevel(20);
			GL11.glBlendFunc(GL11.GL_ONE, GL11.GL_ONE);
			for (int lx = currentLevelX - chunk_range; lx < currentLevelX
					+ chunk_range; lx++) {
				for (int lz = currentLevelZ - chunk_range; lz < currentLevelZ
						+ chunk_range; lz++) {
					Chunk k = level.getChunk(lx, lz);
					if (k != null)
						k.renderSelected(this.mineralToggle);
				}
			}
			GL11.glEnable(GL11.GL_DEPTH_TEST);
			GL11.glBlendFunc(GL11.GL_SRC_ALPHA, GL11.GL_ONE_MINUS_SRC_ALPHA);
		}

		setLightLevel();

		GL11.glPopMatrix();

		// draw the user interface (fps and map)
		drawUI();

		return true;
	}

	/***
	 * Draw the ui
	 */
	private void drawUI() {
		framesSinceLastFps++;

		setOrthoOn(); // 2d mode

		drawMinimap();
		drawFPSCounter();
		drawMineralToggle();
		if (levelInfoToggle)
		{
			drawLevelInfo();
		}
		if (renderDetailsToggle)
		{
			drawRenderDetails();
		}

		setOrthoOff(); // back to 3d mode
	}

	private void updateLevelInfo() {
		int labelX = 5;
		int valueX = 70;
		Graphics2D g = levelInfoTexture.getImage().createGraphics();
		g.setBackground(Color.BLUE);
		g.clearRect(0, 0, 128, 144);
		g.setColor(Color.WHITE);
		g.fillRect(2, 2, 124, 140);
		g.setFont(ARIALFONT);
		int chunkX = level.getChunkX(levelBlockX);
		int chunkZ = level.getChunkZ(levelBlockZ);
		g.setColor(Color.BLACK);
		g.drawString("Chunk X:", labelX, 22);
		g.setColor(Color.RED.darker());
		g.drawString(Integer.toString(chunkX), valueX, 22);

		g.setColor(Color.BLACK);
		g.drawString("Chunk Z:", labelX, 22 + 16);
		g.setColor(Color.RED.darker());
		g.drawString(Integer.toString(chunkZ), valueX, 22 + 16);

		g.setColor(Color.BLACK);
		g.drawString("World X:", labelX, 22 + 32);
		g.setColor(Color.RED.darker());
		g.drawString(Integer.toString(levelBlockX), valueX, 22 + 32);

		g.setColor(Color.BLACK);
		g.drawString("World Z:", labelX, 22 + 16 + 32);
		g.setColor(Color.RED.darker());
		g.drawString(Integer.toString(levelBlockZ), valueX, 22 + 16 + 32);

		g.setColor(Color.BLACK);
		g.drawString("World Y:", labelX, 22 + 16 + 32 + 16);
		g.setColor(Color.RED.darker());
		g.drawString(Integer.toString((int) -camera.getPosition().y), valueX,
				22 + 16 + 32 + 16);

		long heapSize = Runtime.getRuntime().totalMemory();
		g.setColor(Color.BLACK);
		g.drawString("Memory Used", labelX, 22 + 16 + 32 + 16 + 25);
		g.setColor(Color.RED.darker());
		g.drawString(Integer.toString((int) (heapSize / 1024 / 1024)) + " MB",
				20, 22 + 16 + 32 + 16 + 25 + 20);

		levelInfoTexture.update();
	}
	
	private void updateRenderDetails()
	{
		int line_h = 20;
		int x_off = 5;
		int line_count = 0;
		Graphics2D g = renderDetailsTexture.getImage().createGraphics();
		g.setBackground(Color.WHITE);
		g.clearRect(0, 0, renderDetails_w, renderDetailsTexture.getTextureWidth());
		g.setFont(DETAILFONT);
		g.setColor(Color.BLACK);
		if (!lightMode)
		{
			line_count++; g.drawString("Fullbright Enabled", x_off, line_count*line_h);
		}
		else
		{
			line_count++; g.drawString("Light Level: " + (currentLightLevel+1) + "/" + (lightLevelEnd.length), x_off, line_count*line_h);
		}
		line_count++; g.drawString("Render Distance: " + CHUNK_RANGES[currentChunkRange] + "/" + CHUNK_RANGES[CHUNK_RANGES.length-1], x_off, line_count*line_h);
		line_count++; g.drawString("Highlight Distance: " + HIGHLIGHT_RANGES[currentHighlightDistance] + "/" + HIGHLIGHT_RANGES[HIGHLIGHT_RANGES.length-1], x_off, line_count*line_h);
		if (highlightOres)
		{
			line_count++; g.drawString("Highlighting Ores", x_off, line_count*line_h);
		}
		else
		{
			line_count++; g.drawString("Not Highlighting Ores", x_off, line_count*line_h);			
		}
		if (highlight_explored)
		{
			line_count++; g.drawString("Marking Explored Areas", x_off, line_count*line_h);			
		}
		if (render_bedrock)
		{
			line_count++; g.drawString("Rendering Bedrock", x_off, line_count*line_h);
		}
		if (!render_water)
		{
			line_count++; g.drawString("Not Rendering Water", x_off, line_count*line_h);
		}
		cur_renderDetails_h = (line_count+1)*line_h-8;
		g.setColor(Color.BLUE);
		g.setStroke(new BasicStroke(2));
		g.drawRect(1, 1, renderDetails_w-2, cur_renderDetails_h-2);
		renderDetailsTexture.update();
	}

	/***
	 * 
	 */
	private void drawLevelInfo() {
		int y = 48;
		if (renderDetailsToggle)
		{
			y += cur_renderDetails_h + 16;
		}
		GL11.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
		SpriteTool.drawSpriteAbsoluteXY(levelInfoTexture, 0, y);
	}

	/***
	 * 
	 */
	private void drawRenderDetails() {
		renderDetailsTexture.bind();
		GL11.glColor4f(1.0f, 1.0f, 1.0f, .7f);
		SpriteTool.drawCurrentSprite(0, 48, renderDetails_w, cur_renderDetails_h, 0, 0, renderDetails_w/256f, cur_renderDetails_h/256f);
		GL11.glColor4f(1.0f, 1.0f, 1.0f, 1f);
	}

	/***
	 * Draw the mineral toggles
	 */
	private void drawMineralToggle() {
		int barWidth = 128 + 10 + 32;
		int barHeight = 42;
		int maxCols = 5;
		float mineralTogglebarLength;
		if ((mineralToggleTextures.length % maxCols) == 0) {
			mineralTogglebarLength = maxCols * barWidth;
		} else {
			mineralTogglebarLength = (mineralToggleTextures.length % maxCols)
					* barWidth;
		}
		float curX = (screenWidth / 2.0f) - (mineralTogglebarLength / 2.0f);
		float curY = screenHeight - barHeight;
		if (mineralToggleTextures.length > maxCols) {
			curY -= barHeight;
		}

		for (int i = 0; i < mineralToggleTextures.length; i++) {
			if (i == mineralToggleTextures.length - maxCols) {
				mineralTogglebarLength = maxCols * barWidth;
				curY += barHeight;
				curX = (screenWidth / 2.0f) - (mineralTogglebarLength / 2.0f);
			}
			if (mineralToggle[i]) {
				GL11.glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
				GL11.glDisable(GL11.GL_TEXTURE_2D);
				SpriteTool
						.drawCurrentSprite(
								curX - 2,
								curY - 2,
								36,
								36,
								MineCraftConstants.precalcSpriteSheetToTextureX[blockDataToSpriteSheet[HIGHLIGHT_ORES[i].id]],
								MineCraftConstants.precalcSpriteSheetToTextureY[blockDataToSpriteSheet[HIGHLIGHT_ORES[i].id]],
								MineCraftConstants.precalcSpriteSheetToTextureX[blockDataToSpriteSheet[HIGHLIGHT_ORES[i].id]]
										+ TEX16,
								MineCraftConstants.precalcSpriteSheetToTextureY[blockDataToSpriteSheet[HIGHLIGHT_ORES[i].id]]
										+ TEX32);
				GL11.glEnable(GL11.GL_TEXTURE_2D);
			} else {
				GL11.glColor4f(0.5f, 0.5f, 0.5f, 1.0f);
			}
			minecraftTexture.bind();
			SpriteTool
					.drawCurrentSprite(
							curX,
							curY,
							32,
							32,
							MineCraftConstants.precalcSpriteSheetToTextureX[blockDataToSpriteSheet[HIGHLIGHT_ORES[i].id]],
							MineCraftConstants.precalcSpriteSheetToTextureY[blockDataToSpriteSheet[HIGHLIGHT_ORES[i].id]],
							MineCraftConstants.precalcSpriteSheetToTextureX[blockDataToSpriteSheet[HIGHLIGHT_ORES[i].id]]
									+ TEX16,
							MineCraftConstants.precalcSpriteSheetToTextureY[blockDataToSpriteSheet[HIGHLIGHT_ORES[i].id]]
									+ TEX32);

			SpriteTool.drawSpriteAbsoluteXY(mineralToggleTextures[i],
					curX + 32 + 10, curY + 7);
			curX += barWidth;
		}
	}

	/***
	 * Draws a simple fps counter on the top-left of the screen
	 */
	private void drawFPSCounter() {
		previousTime = time;
		time = System.nanoTime();
		timeDelta = time - previousTime;

		if (time - lastFpsTime > NANOSPERSECOND) {
			fps = framesSinceLastFps;
			framesSinceLastFps = 0;
			lastFpsTime = time;
			updateFPSText = true;
		}
		if (updateFPSText) {
			if (levelInfoToggle)
				updateLevelInfo();
			Graphics2D g = fpsTexture.getImage().createGraphics();
			g.setBackground(Color.BLUE);
			g.clearRect(0, 0, 128, 32);
			g.setColor(Color.WHITE);
			g.fillRect(2, 2, 124, 28);
			g.setColor(Color.BLACK);
			g.setFont(ARIALFONT);
			g.drawString("FPS:", 10, 22);
			g.setColor(Color.RED.darker());
			g.drawString(Integer.toString(fps), 60, 22);

			fpsTexture.update();

			updateFPSText = false;
		}

		fpsTexture.bind();

		GL11.glColor4f(1.0f, 1.0f, 1.0f, 0.7f);
		SpriteTool.drawSpriteAbsoluteXY(fpsTexture, 0, 0);
		GL11.glColor4f(1.0f, 1.0f, 1.0f, 1f);
	}

	/***
	 * Sets ortho (2d) mode
	 */
	public void setOrthoOn() {
		// prepare projection matrix to render in 2D
		GL11.glMatrixMode(GL11.GL_PROJECTION);
		GL11.glPushMatrix(); // preserve perspective view
		GL11.glLoadIdentity(); // clear the perspective matrix
		GL11.glOrtho( // turn on 2D mode
				// //viewportX,viewportX+viewportW, // left, right
				// //viewportY,viewportY+viewportH, // bottom, top !!!
				0, screenWidth, // left, right
				screenHeight, 0, // bottom, top
				-500, 500); // Zfar, Znear
		// clear the modelview matrix
		GL11.glMatrixMode(GL11.GL_MODELVIEW);
		GL11.glPushMatrix(); // Preserve the Modelview Matrix
		GL11.glLoadIdentity(); // clear the Modelview Matrix
		// disable depth test so further drawing will go over the current scene
		GL11.glDisable(GL11.GL_DEPTH_TEST);
	}

	/**
	 * Restore the previous mode
	 */
	public static void setOrthoOff() {
		// restore the original positions and views
		GL11.glMatrixMode(GL11.GL_PROJECTION);
		GL11.glPopMatrix();
		GL11.glMatrixMode(GL11.GL_MODELVIEW);
		GL11.glPopMatrix();
		// turn Depth Testing back on
		GL11.glEnable(GL11.GL_DEPTH_TEST);
	}

	/***
	 * draws the minimap or the big map
	 */
	private void drawMinimap() {
		if (mapBig) {
			// the big map
			// just draws the texture, but move the texture so the middle of the
			// screen is where we currently are

			minimapTexture.bind();

			float vSizeFactor = .5f;

			float vTexX = -(1.0f / minimap_dim_f) * currentCameraPosZ;
			float vTexY = (1.0f / minimap_dim_f) * currentCameraPosX;
			float vTexZ = vSizeFactor;

			GL11.glColor4f(1.0f, 1.0f, 1.0f, 0.7f);
			GL11.glPushMatrix();
			GL11.glTranslatef((screenWidth / 2.0f), (screenHeight / 2.0f), 0.0f);
			GL11.glBegin(GL11.GL_TRIANGLE_STRIP);

			GL11.glTexCoord2f(vTexX - vTexZ, vTexY - vTexZ);
			GL11.glVertex2f(-minimap_dim_h_f, -minimap_dim_h_f);

			GL11.glTexCoord2f(vTexX + vTexZ, vTexY - vTexZ);
			GL11.glVertex2f(+minimap_dim_h_f, -minimap_dim_h_f);

			GL11.glTexCoord2f(vTexX - vTexZ, vTexY + vTexZ);
			GL11.glVertex2f(-minimap_dim_h_f, +minimap_dim_h_f);

			GL11.glTexCoord2f(vTexX + vTexZ, vTexY + vTexZ);
			GL11.glVertex2f(+minimap_dim_h_f, +minimap_dim_h_f);

			GL11.glEnd();
			GL11.glPopMatrix();
			GL11.glColor4f(1.0f, 1.0f, 1.0f, 1f);

			SpriteTool.drawSpriteAndRotateAndScale(minimapArrowTexture,
					screenWidth / 2.0f, screenHeight / 2.0f,
					camera.getYaw() + 90, 0.5f);
		} else {
			// the minimap
			// I set the minimap to 200 wide and tall

			// Interestingly, thanks to the fact that we're using GL11.GL_REPEAT
			// on our
			// textures (via glTexParameter), we don't have to worry about
			// checking
			// bounds here, etc. Or in other words, our map will automatically
			// wrap for
			// us. Sweet!
			float vSizeFactor = 200.0f / minimap_dim_f;

			float vTexX = -(1.0f / minimap_dim_f) * currentCameraPosZ;
			float vTexY = (1.0f / minimap_dim_f) * currentCameraPosX;
			float vTexZ = vSizeFactor;

			minimapTexture.bind();
			GL11.glColor4f(1.0f, 1.0f, 1.0f, 0.7f);
			GL11.glPushMatrix();
			GL11.glTranslatef(screenWidth - 100, 100, 0.0f);
			GL11.glBegin(GL11.GL_TRIANGLE_STRIP);

			GL11.glTexCoord2f(vTexX - vTexZ, vTexY - vTexZ);
			GL11.glVertex2f(-100, -100);

			GL11.glTexCoord2f(vTexX + vTexZ, vTexY - vTexZ);
			GL11.glVertex2f(+100, -100);

			GL11.glTexCoord2f(vTexX - vTexZ, vTexY + vTexZ);
			GL11.glVertex2f(-100, +100);

			GL11.glTexCoord2f(vTexX + vTexZ, vTexY + vTexZ);
			GL11.glVertex2f(+100, +100);

			GL11.glEnd();
			GL11.glPopMatrix();
			GL11.glColor4f(1.0f, 1.0f, 1.0f, 1f);

			SpriteTool.drawSpriteAndRotateAndScale(minimapArrowTexture,
					screenWidth - 100, 100, camera.getYaw() + 90, 0.5f);
		}
	}

	/**
	 * Returns the "base" minimap X coordinate, given chunk coordinate Z. The
	 * "base" will be the upper right corner.
	 * 
	 * In Minecraft, Z increases to the West, and decreases to the East, so our
	 * minimap X coordinate will go up as chunkZ goes down.
	 * 
	 * @param chunkZ
	 * @return
	 */
	private int getMinimapBaseX(int chunkZ) {
		if (chunkZ < 0) {
			return ((Math.abs(chunkZ + 1) * 16) % minimap_dim) + 15;
		} else {
			return minimap_dim - (((chunkZ * 16) + 1) % minimap_dim);
		}
	}

	/**
	 * Returns the "base" minimap Y coordinate, given chunk coordinate X. The
	 * "base" will be the upper right corner.
	 * 
	 * In Minecraft, X increases to the South, and decreases to the North, so
	 * our minimap Y coordinate will go up as chunkX goes up (since the origin
	 * of a texture is in the upper-left).
	 * 
	 * @param chunkX
	 * @return
	 */
	private int getMinimapBaseY(int chunkX) {
		if (chunkX < 0) {
			return (minimap_dim - ((Math.abs(chunkX) * 16) % minimap_dim))
					% minimap_dim;
		} else {
			return (chunkX * 16) % minimap_dim;
		}
	}

	/**
	 * Clears out the area on the minimap belonging to this chunk
	 * 
	 * @param x
	 * @param z
	 */
	public void removeMapChunkFromMap(int x, int z) {
		// minimapGraphics.setColor(new Color(0f, 0f, 0f, 1f));
		// minimapGraphics.setComposite(AlphaComposite.Src);
		minimapGraphics.fillRect(getMinimapBaseX(z) - 15, getMinimapBaseY(x),
				16, 16);
		level.getChunk(x, z).isOnMinimap = false;
	}

	/**
	 * Loops through a list of chunks and removes them from the minimap
	 * 
	 * @param trimList
	 */
	private void removeChunklistFromMap(ArrayList<Chunk> trimList) {
		minimapGraphics.setColor(new Color(0f, 0f, 0f, 0f));
		minimapGraphics.setComposite(AlphaComposite.Src);
		boolean minimap_changed = false;
		for (Chunk tempchunk_trim : trimList) {
			removeMapChunkFromMap(tempchunk_trim.x, tempchunk_trim.z);
			minimap_changed = true;
		}
		if (minimap_changed) {
			minimapTexture.update();
		}
	}

	/***
	 * draws a chunk to the (mini) map
	 * 
	 * @param x
	 * @param z
	 */
	public void drawChunkToMap(int x, int z) {

		Chunk c = level.getChunk(x, z);
		if (c != null) {
			c.isOnMinimap = true;
		}
		byte[] chunkData = level.getChunkData(x, z);

		int base_x = getMinimapBaseX(z);
		int base_y = getMinimapBaseY(x);

		Graphics2D g = minimapGraphics;
		for (int zz = 0; zz < 16; zz++) {
			for (int xx = 0; xx < 16; xx++) {
				// determine the top most visible block
				for (int yy = 127; yy >= 0; yy--) {
					int blockOffset = yy + (zz * 128) + (xx * 128 * 16);
					byte blockData = chunkData[blockOffset];

					if (MineCraftConstants.blockDataToSpriteSheet[blockData] > -1) {
						if (blockData > -1) {
							Color blockColor = MineCraftConstants.blockColors[blockData];
							if (blockColor != null) {
								// Previously we were using g.drawLine() here,
								// but a minute-or-so's worth of investigating
								// didn't uncover a way to force that to be
								// pixel-precise (the color would often bleed
								// over
								// into adjoining pixels), so we're using
								// g.fillRect() instead, which actually looks
								// like it
								// is probably a faster operation anyway. I'm
								// sure there'd have been a way to get drawLine
								// to behave, but c'est la vie!
								g.setColor(blockColor);
								g.fillRect(base_x - zz, base_y + xx, 1, 1);
							}
						}
						break;
					}
				}
			}
		}
	}

	/***
	 * Draws the minimap sprites (currently just the arrow image) to their
	 * textures
	 */
	private void createMinimapSprites() {

		// First the arrow
		Graphics2D g = minimapArrowTexture.getImage().createGraphics();
		g.setColor(Color.red);
		g.setStroke(new BasicStroke(5));
		g.drawLine(3, 16, 30, 24);
		g.drawLine(30, 24, 30, 8);
		g.drawLine(30, 8, 3, 16);
		minimapArrowTexture.update();
	}

	/***
	 * cleanup
	 */
	private void cleanup() {
		Display.destroy();
	}

}