Added block breaking stuff.

client/src/main/java/nl/andrewl/aos2_client/Client.java

@@ -1,15 +1,20 @@
 package nl.andrewl.aos2_client;
 
+import nl.andrewl.aos2_client.control.InputHandler;
 import nl.andrewl.aos2_client.control.PlayerInputKeyCallback;
+import nl.andrewl.aos2_client.control.PlayerInputMouseClickCallback;
 import nl.andrewl.aos2_client.control.PlayerViewCursorCallback;
 import nl.andrewl.aos2_client.render.GameRenderer;
 import nl.andrewl.aos_core.model.Chunk;
 import nl.andrewl.aos_core.model.ColorPalette;
 import nl.andrewl.aos_core.model.World;
 import nl.andrewl.aos_core.net.ChunkDataMessage;
+import nl.andrewl.aos_core.net.ChunkHashMessage;
 import nl.andrewl.aos_core.net.WorldInfoMessage;
+import nl.andrewl.aos_core.net.udp.ChunkUpdateMessage;
 import nl.andrewl.aos_core.net.udp.PlayerUpdateMessage;
 import nl.andrewl.record_net.Message;
+import org.joml.Vector3i;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -25,6 +30,7 @@ public class Client implements Runnable {
 	private final String username;
 
 	private final CommunicationHandler communicationHandler;
+	private final InputHandler inputHandler;
 	private final GameRenderer gameRenderer;
 
 	private int clientId;
@@ -35,6 +41,7 @@ public class Client implements Runnable {
 		this.serverPort = serverPort;
 		this.username = username;
 		this.communicationHandler = new CommunicationHandler(this);
+		this.inputHandler = new InputHandler(communicationHandler);
 		this.world = new ClientWorld();
 		this.gameRenderer = new GameRenderer(world);
 	}
@@ -52,7 +59,8 @@ public class Client implements Runnable {
 
 		gameRenderer.setupWindow(
 				new PlayerViewCursorCallback(gameRenderer.getCamera(), communicationHandler),
-				new PlayerInputKeyCallback(communicationHandler)
+				new PlayerInputKeyCallback(inputHandler),
+				new PlayerInputMouseClickCallback(inputHandler)
 		);
 
 		long lastFrameAt = System.currentTimeMillis();
@@ -82,11 +90,22 @@ public class Client implements Runnable {
 		if (msg instanceof ChunkDataMessage chunkDataMessage) {
 			Chunk chunk = chunkDataMessage.toChunk();
 			world.addChunk(chunk);
-			gameRenderer.getChunkRenderer().addChunkMesh(chunk);
+			gameRenderer.getChunkRenderer().queueChunkMesh(chunk);
+		}
+		if (msg instanceof ChunkUpdateMessage u) {
+			Vector3i chunkPos = new Vector3i(u.cx(), u.cy(), u.cz());
+			Chunk chunk = world.getChunkAt(chunkPos);
+			System.out.println(u);
+			if (chunk != null) {
+				chunk.setBlockAt(u.lx(), u.ly(), u.lz(), u.newBlock());
+				gameRenderer.getChunkRenderer().queueChunkMesh(chunk);
+			} else {
+				communicationHandler.sendMessage(new ChunkHashMessage(u.cx(), u.cy(), u.cz(), -1));
+			}
 		}
 		if (msg instanceof PlayerUpdateMessage playerUpdate) {
 			if (playerUpdate.clientId() == clientId) {
-				float eyeHeight = playerUpdate.crouching() ? 1.1f : 1.7f;
+				float eyeHeight = playerUpdate.crouching() ? 1.3f : 1.7f;
 				gameRenderer.getCamera().setPosition(playerUpdate.px(), playerUpdate.py() + eyeHeight, playerUpdate.pz());
 				gameRenderer.getCamera().setVelocity(playerUpdate.vx(), playerUpdate.vy(), playerUpdate.vz());
 				// TODO: Unload far away chunks and request close chunks we don't have.

client/src/main/java/nl/andrewl/aos2_client/control/InputHandler.java

@@ -0,0 +1,39 @@
+package nl.andrewl.aos2_client.control;
+
+import nl.andrewl.aos2_client.CommunicationHandler;
+import nl.andrewl.aos_core.net.udp.ClientInputState;
+
+import static org.lwjgl.glfw.GLFW.*;
+
+/**
+ * Class which manages the player's input, and sending it to the server.
+ */
+public class InputHandler {
+	private final CommunicationHandler comm;
+
+	private ClientInputState lastInputState = null;
+
+	public InputHandler(CommunicationHandler comm) {
+		this.comm = comm;
+	}
+
+	public void updateInputState(long window) {
+		// TODO: Allow customized keybindings.
+		ClientInputState currentInputState = new ClientInputState(
+				comm.getClientId(),
+				glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS,
+				glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS,
+				glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS,
+				glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS,
+				glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS,
+				glfwGetKey(window, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS,
+				glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS,
+				glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_1) == GLFW_PRESS,
+				glfwGetMouseButton(window, GLFW_MOUSE_BUTTON_2) == GLFW_PRESS
+		);
+		if (!currentInputState.equals(lastInputState)) {
+			comm.sendDatagramPacket(currentInputState);
+			lastInputState = currentInputState;
+		}
+	}
+}

client/src/main/java/nl/andrewl/aos2_client/control/PlayerInputKeyCallback.java

@@ -1,17 +1,14 @@
 package nl.andrewl.aos2_client.control;
 
-import nl.andrewl.aos2_client.CommunicationHandler;
-import nl.andrewl.aos_core.net.udp.ClientInputState;
 import org.lwjgl.glfw.GLFWKeyCallbackI;
 
 import static org.lwjgl.glfw.GLFW.*;
 
 public class PlayerInputKeyCallback implements GLFWKeyCallbackI {
-	private ClientInputState lastInputState = null;
+	private final InputHandler inputHandler;
-	private final CommunicationHandler comm;
 
-	public PlayerInputKeyCallback(CommunicationHandler comm) {
+	public PlayerInputKeyCallback(InputHandler inputHandler) {
-		this.comm = comm;
+		this.inputHandler = inputHandler;
 	}
 
 	@Override
@@ -19,20 +16,6 @@ public class PlayerInputKeyCallback implements GLFWKeyCallbackI {
 		if (key == GLFW_KEY_ESCAPE && action == GLFW_RELEASE) {
 			glfwSetWindowShouldClose(window, true);
 		}
-
+		inputHandler.updateInputState(window);
-		ClientInputState inputState = new ClientInputState(
-				comm.getClientId(),
-				glfwGetKey(window, GLFW_KEY_W) == GLFW_PRESS,
-				glfwGetKey(window, GLFW_KEY_S) == GLFW_PRESS,
-				glfwGetKey(window, GLFW_KEY_A) == GLFW_PRESS,
-				glfwGetKey(window, GLFW_KEY_D) == GLFW_PRESS,
-				glfwGetKey(window, GLFW_KEY_SPACE) == GLFW_PRESS,
-				glfwGetKey(window, GLFW_KEY_LEFT_CONTROL) == GLFW_PRESS,
-				glfwGetKey(window, GLFW_KEY_LEFT_SHIFT) == GLFW_PRESS
-		);
-		if (!inputState.equals(lastInputState)) {
-			comm.sendDatagramPacket(inputState);
-			lastInputState = inputState;
-		}
 	}
 }

client/src/main/java/nl/andrewl/aos2_client/control/PlayerInputMouseClickCallback.java

@@ -0,0 +1,20 @@
+package nl.andrewl.aos2_client.control;
+
+import org.lwjgl.glfw.GLFWMouseButtonCallbackI;
+
+/**
+ * Callback that's called when the player clicks with their mouse.
+ */
+public class PlayerInputMouseClickCallback implements GLFWMouseButtonCallbackI {
+	private final InputHandler inputHandler;
+
+	public PlayerInputMouseClickCallback(InputHandler inputHandler) {
+		this.inputHandler = inputHandler;
+	}
+
+	@Override
+	public void invoke(long window, int button, int action, int mods) {
+		System.out.println("Click: " + button);
+		inputHandler.updateInputState(window);
+	}
+}

client/src/main/java/nl/andrewl/aos2_client/control/PlayerViewCursorCallback.java

@@ -9,6 +9,10 @@ import java.util.concurrent.ForkJoinPool;
 
 import static org.lwjgl.glfw.GLFW.glfwGetCursorPos;
 
+/**
+ * Callback that's called when the player's cursor position updates. This means
+ * the player is looking around.
+ */
 public class PlayerViewCursorCallback implements GLFWCursorPosCallbackI {
 	/**
 	 * The number of milliseconds to wait before sending orientation updates,

client/src/main/java/nl/andrewl/aos2_client/render/ChunkMesh.java

@@ -2,6 +2,8 @@ package nl.andrewl.aos2_client.render;
 
 import nl.andrewl.aos_core.model.Chunk;
 import nl.andrewl.aos_core.model.World;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 import static org.lwjgl.opengl.GL46.*;
 
@@ -9,6 +11,8 @@ import static org.lwjgl.opengl.GL46.*;
  * Represents a 3d mesh for a chunk.
  */
 public class ChunkMesh {
+	private static final Logger log = LoggerFactory.getLogger(ChunkMesh.class);
+
 	private final int vboId;
 	private final int vaoId;
 	private final int eboId;
@@ -50,12 +54,11 @@ public class ChunkMesh {
 		double dur = (System.nanoTime() - start) / 1_000_000.0;
 		this.indexCount = meshData.indexBuffer().limit();
 		// Print some debug information.
-		System.out.printf(
+		log.debug(
-				"Generated mesh for chunk (%d, %d, %d) in %.3f ms. %d vertices, %d indices.%n",
+				"Generated mesh for chunk ({}, {}, {}) in {} ms. {} vertices and {} indices.",
 				chunk.getPosition().x, chunk.getPosition().y, chunk.getPosition().z,
 				dur,
-				meshData.vertexBuffer().limit() / 9,
+				meshData.vertexBuffer().limit() / 9, indexCount
-				indexCount
 		);
 
 		glBindBuffer(GL_ARRAY_BUFFER, vboId);

client/src/main/java/nl/andrewl/aos2_client/render/ChunkRenderer.java

@@ -42,7 +42,7 @@ public class ChunkRenderer {
 		glUniform1i(chunkSizeUniform, Chunk.SIZE);
 	}
 
-	public void addChunkMesh(Chunk chunk) {
+	public void queueChunkMesh(Chunk chunk) {
 		meshGenerationQueue.add(chunk);
 	}
 
@@ -54,6 +54,8 @@ public class ChunkRenderer {
 		while (!meshGenerationQueue.isEmpty()) {
 			Chunk chunk = meshGenerationQueue.remove();
 			ChunkMesh mesh = new ChunkMesh(chunk, world, chunkMeshGenerator);
+			ChunkMesh existingMesh = chunkMeshes.get(chunk.getPosition());
+			if (existingMesh != null) existingMesh.free();
 			chunkMeshes.put(chunk.getPosition(), mesh);
 		}
 		shaderProgram.use();

client/src/main/java/nl/andrewl/aos2_client/render/GameRenderer.java

@@ -1,14 +1,9 @@
 package nl.andrewl.aos2_client.render;
 
 import nl.andrewl.aos2_client.Camera;
-import nl.andrewl.aos2_client.control.PlayerInputKeyCallback;
-import nl.andrewl.aos2_client.control.PlayerViewCursorCallback;
-import nl.andrewl.aos_core.model.Chunk;
 import nl.andrewl.aos_core.model.World;
 import org.joml.Matrix4f;
-import org.lwjgl.glfw.Callbacks;
+import org.lwjgl.glfw.*;
-import org.lwjgl.glfw.GLFWErrorCallback;
-import org.lwjgl.glfw.GLFWVidMode;
 import org.lwjgl.opengl.GL;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
@@ -48,7 +43,7 @@ public class GameRenderer {
 
 	}
 
-	public void setupWindow(PlayerViewCursorCallback viewCursorCallback, PlayerInputKeyCallback inputKeyCallback) {
+	public void setupWindow(GLFWCursorPosCallbackI viewCursorCallback, GLFWKeyCallbackI inputKeyCallback, GLFWMouseButtonCallbackI mouseButtonCallback) {
 		GLFWErrorCallback.createPrint(System.err).set();
 		if (!glfwInit()) throw new IllegalStateException("Could not initialize GLFW.");
 		glfwDefaultWindowHints();
@@ -65,6 +60,7 @@ public class GameRenderer {
 		// Setup callbacks.
 		glfwSetKeyCallback(windowHandle, inputKeyCallback);
 		glfwSetCursorPosCallback(windowHandle, viewCursorCallback);
+		glfwSetMouseButtonCallback(windowHandle, mouseButtonCallback);
 		glfwSetInputMode(windowHandle, GLFW_CURSOR, GLFW_CURSOR_DISABLED);
 		glfwSetInputMode(windowHandle, GLFW_RAW_MOUSE_MOTION, GLFW_TRUE);
 		glfwSetCursorPos(windowHandle, 0, 0);
@@ -118,13 +114,16 @@ public class GameRenderer {
 		updatePerspective();
 	}
 
+	public float getAspectRatio() {
+		return (float) screenWidth / (float) screenHeight;
+	}
+
 	/**
 	 * Updates the rendering perspective used to render the game. Note: only
 	 * call this after calling {@link ChunkRenderer#setupShaderProgram()}.
 	 */
 	private void updatePerspective() {
-		float aspect = (float) screenWidth / (float) screenHeight;
+		perspectiveTransform.setPerspective(fov, getAspectRatio(), Z_NEAR, Z_FAR);
-		perspectiveTransform.setPerspective(fov, aspect, Z_NEAR, Z_FAR);
 		chunkRenderer.setPerspective(perspectiveTransform);
 	}
 

client/src/main/java/nl/andrewl/aos2_client/render/font/Character.java

@@ -0,0 +1,104 @@
+package nl.andrewl.aos2_client.render.font;
+
+/**
+ * Simple data structure class holding information about a certain glyph in the
+ * font texture atlas. All sizes are for a font-size of 1.
+ * 
+ * @author Karl
+ *
+ */
+public class Character {
+
+	private int id;
+	private double xTextureCoord;
+	private double yTextureCoord;
+	private double xMaxTextureCoord;
+	private double yMaxTextureCoord;
+	private double xOffset;
+	private double yOffset;
+	private double sizeX;
+	private double sizeY;
+	private double xAdvance;
+
+	/**
+	 * @param id
+	 *            - the ASCII value of the character.
+	 * @param xTextureCoord
+	 *            - the x texture coordinate for the top left corner of the
+	 *            character in the texture atlas.
+	 * @param yTextureCoord
+	 *            - the y texture coordinate for the top left corner of the
+	 *            character in the texture atlas.
+	 * @param xTexSize
+	 *            - the width of the character in the texture atlas.
+	 * @param yTexSize
+	 *            - the height of the character in the texture atlas.
+	 * @param xOffset
+	 *            - the x distance from the curser to the left edge of the
+	 *            character's quad.
+	 * @param yOffset
+	 *            - the y distance from the curser to the top edge of the
+	 *            character's quad.
+	 * @param sizeX
+	 *            - the width of the character's quad in screen space.
+	 * @param sizeY
+	 *            - the height of the character's quad in screen space.
+	 * @param xAdvance
+	 *            - how far in pixels the cursor should advance after adding
+	 *            this character.
+	 */
+	protected Character(int id, double xTextureCoord, double yTextureCoord, double xTexSize, double yTexSize,
+			double xOffset, double yOffset, double sizeX, double sizeY, double xAdvance) {
+		this.id = id;
+		this.xTextureCoord = xTextureCoord;
+		this.yTextureCoord = yTextureCoord;
+		this.xOffset = xOffset;
+		this.yOffset = yOffset;
+		this.sizeX = sizeX;
+		this.sizeY = sizeY;
+		this.xMaxTextureCoord = xTexSize + xTextureCoord;
+		this.yMaxTextureCoord = yTexSize + yTextureCoord;
+		this.xAdvance = xAdvance;
+	}
+
+	protected int getId() {
+		return id;
+	}
+
+	protected double getxTextureCoord() {
+		return xTextureCoord;
+	}
+
+	protected double getyTextureCoord() {
+		return yTextureCoord;
+	}
+
+	protected double getXMaxTextureCoord() {
+		return xMaxTextureCoord;
+	}
+
+	protected double getYMaxTextureCoord() {
+		return yMaxTextureCoord;
+	}
+
+	protected double getxOffset() {
+		return xOffset;
+	}
+
+	protected double getyOffset() {
+		return yOffset;
+	}
+
+	protected double getSizeX() {
+		return sizeX;
+	}
+
+	protected double getSizeY() {
+		return sizeY;
+	}
+
+	protected double getxAdvance() {
+		return xAdvance;
+	}
+
+}

client/src/main/java/nl/andrewl/aos2_client/render/font/FontRenderer.java

@@ -0,0 +1,20 @@
+package nl.andrewl.aos2_client.render.font;
+
+import nl.andrewl.aos2_client.render.ShaderProgram;
+
+import static org.lwjgl.opengl.GL46.*;
+
+public class FontRenderer {
+	private final ShaderProgram shaderProgram;
+
+	public FontRenderer() {
+		shaderProgram = new ShaderProgram.Builder()
+				.withShader("/shader/text/vertex.glsl", GL_VERTEX_SHADER)
+				.withShader("/shader/text/fragment.glsl", GL_FRAGMENT_SHADER)
+				.build();
+	}
+
+	public void free() {
+		shaderProgram.free();
+	}
+}

client/src/main/java/nl/andrewl/aos2_client/render/font/FontType.java

@@ -0,0 +1,52 @@
+package nl.andrewl.aos2_client.render.font;
+
+import java.io.File;
+
+/**
+ * Represents a font. It holds the font's texture atlas as well as having the
+ * ability to create the quad vertices for any text using this font.
+ * 
+ * @author Karl
+ *
+ */
+public class FontType {
+
+	private final int textureAtlas;
+	private final TextMeshCreator loader;
+
+	/**
+	 * Creates a new font and loads up the data about each character from the
+	 * font file.
+	 * 
+	 * @param textureAtlas
+	 *            - the ID of the font atlas texture.
+	 * @param fontFile
+	 *            - the font file containing information about each character in
+	 *            the texture atlas.
+	 */
+	public FontType(int textureAtlas, File fontFile, float aspectRatio) {
+		this.textureAtlas = textureAtlas;
+		this.loader = new TextMeshCreator(fontFile, aspectRatio);
+	}
+
+	/**
+	 * @return The font texture atlas.
+	 */
+	public int getTextureAtlas() {
+		return textureAtlas;
+	}
+
+	/**
+	 * Takes in an unloaded text and calculate all of the vertices for the quads
+	 * on which this text will be rendered. The vertex positions and texture
+	 * coords and calculated based on the information from the font file.
+	 * 
+	 * @param text
+	 *            - the unloaded text.
+	 * @return Information about the vertices of all the quads.
+	 */
+	public TextMeshData loadText(GUIText text) {
+		return loader.createTextMesh(text);
+	}
+
+}

client/src/main/java/nl/andrewl/aos2_client/render/font/GUIText.java

@@ -0,0 +1,196 @@
+package nl.andrewl.aos2_client.render.font;
+
+import org.joml.Vector2f;
+import org.joml.Vector3f;
+import org.lwjgl.BufferUtils;
+
+import java.nio.FloatBuffer;
+
+import static org.lwjgl.opengl.GL46.*;
+
+/**
+ * Represents a piece of text in the game.
+ * 
+ * @author Karl
+ *
+ */
+public class GUIText {
+
+	private final String textString;
+	private final float fontSize;
+
+	private int textMeshVao;
+	private int textMeshVbo;
+	private int vertexCount;
+	private final Vector3f colour = new Vector3f(0f, 0f, 0f);
+
+	private final Vector2f position;
+	private final float lineMaxSize;
+	private int numberOfLines;
+
+	private final FontType font;
+
+	private boolean centerText;
+
+	/**
+	 * Creates a new text, loads the text's quads into a VAO, and adds the text
+	 * to the screen.
+	 * 
+	 * @param text
+	 *            - the text.
+	 * @param fontSize
+	 *            - the font size of the text, where a font size of 1 is the
+	 *            default size.
+	 * @param font
+	 *            - the font that this text should use.
+	 * @param position
+	 *            - the position on the screen where the top left corner of the
+	 *            text should be rendered. The top left corner of the screen is
+	 *            (0, 0) and the bottom right is (1, 1).
+	 * @param maxLineLength
+	 *            - basically the width of the virtual page in terms of screen
+	 *            width (1 is full screen width, 0.5 is half the width of the
+	 *            screen, etc.) Text cannot go off the edge of the page, so if
+	 *            the text is longer than this length it will go onto the next
+	 *            line. When text is centered it is centered into the middle of
+	 *            the line, based on this line length value.
+	 * @param centered
+	 *            - whether the text should be centered or not.
+	 */
+	public GUIText(String text, float fontSize, FontType font, Vector2f position, float maxLineLength,
+			boolean centered) {
+		this.textString = text;
+		this.fontSize = fontSize;
+		this.font = font;
+		this.position = position;
+		this.lineMaxSize = maxLineLength;
+		this.centerText = centered;
+		// load text
+		TextMeshData meshData = font.loadText(this);
+		textMeshVao = glGenVertexArrays();
+		textMeshVbo = glGenBuffers();
+		glBindBuffer(GL_ARRAY_BUFFER, textMeshVbo);
+//		FloatBuffer buffer1 = BufferUtils.createFloatBuffer(meshData)
+	}
+
+	/**
+	 * Remove the text from the screen.
+	 */
+	public void remove() {
+		// remove text
+	}
+
+	/**
+	 * @return The font used by this text.
+	 */
+	public FontType getFont() {
+		return font;
+	}
+
+	/**
+	 * Set the colour of the text.
+	 * 
+	 * @param r
+	 *            - red value, between 0 and 1.
+	 * @param g
+	 *            - green value, between 0 and 1.
+	 * @param b
+	 *            - blue value, between 0 and 1.
+	 */
+	public void setColour(float r, float g, float b) {
+		colour.set(r, g, b);
+	}
+
+	/**
+	 * @return the colour of the text.
+	 */
+	public Vector3f getColour() {
+		return colour;
+	}
+
+	/**
+	 * @return The number of lines of text. This is determined when the text is
+	 *         loaded, based on the length of the text and the max line length
+	 *         that is set.
+	 */
+	public int getNumberOfLines() {
+		return numberOfLines;
+	}
+
+	/**
+	 * @return The position of the top-left corner of the text in screen-space.
+	 *         (0, 0) is the top left corner of the screen, (1, 1) is the bottom
+	 *         right.
+	 */
+	public Vector2f getPosition() {
+		return position;
+	}
+
+	/**
+	 * @return the ID of the text's VAO, which contains all the vertex data for
+	 *         the quads on which the text will be rendered.
+	 */
+	public int getMesh() {
+		return textMeshVao;
+	}
+
+	/**
+	 * Set the VAO and vertex count for this text.
+	 * 
+	 * @param vao
+	 *            - the VAO containing all the vertex data for the quads on
+	 *            which the text will be rendered.
+	 * @param verticesCount
+	 *            - the total number of vertices in all of the quads.
+	 */
+	public void setMeshInfo(int vao, int verticesCount) {
+		this.textMeshVao = vao;
+		this.vertexCount = verticesCount;
+	}
+
+	/**
+	 * @return The total number of vertices of all the text's quads.
+	 */
+	public int getVertexCount() {
+		return this.vertexCount;
+	}
+
+	/**
+	 * @return the font size of the text (a font size of 1 is normal).
+	 */
+	protected float getFontSize() {
+		return fontSize;
+	}
+
+	/**
+	 * Sets the number of lines that this text covers (method used only in
+	 * loading).
+	 * 
+	 * @param number
+	 */
+	protected void setNumberOfLines(int number) {
+		this.numberOfLines = number;
+	}
+
+	/**
+	 * @return {@code true} if the text should be centered.
+	 */
+	protected boolean isCentered() {
+		return centerText;
+	}
+
+	/**
+	 * @return The maximum length of a line of this text.
+	 */
+	protected float getMaxLineSize() {
+		return lineMaxSize;
+	}
+
+	/**
+	 * @return The string of text.
+	 */
+	protected String getTextString() {
+		return textString;
+	}
+
+}

client/src/main/java/nl/andrewl/aos2_client/render/font/Line.java

@@ -0,0 +1,77 @@
+package nl.andrewl.aos2_client.render.font;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Represents a line of text during the loading of a text.
+ * 
+ * @author Karl
+ *
+ */
+public class Line {
+
+	private final double maxLength;
+	private final double spaceSize;
+
+	private final List<Word> words = new ArrayList<Word>();
+	private double currentLineLength = 0;
+
+	/**
+	 * Creates an empty line.
+	 * 
+	 * @param spaceWidth
+	 *            - the screen-space width of a space character.
+	 * @param fontSize
+	 *            - the size of font being used.
+	 * @param maxLength
+	 *            - the screen-space maximum length of a line.
+	 */
+	protected Line(double spaceWidth, double fontSize, double maxLength) {
+		this.spaceSize = spaceWidth * fontSize;
+		this.maxLength = maxLength;
+	}
+
+	/**
+	 * Attempt to add a word to the line. If the line can fit the word in
+	 * without reaching the maximum line length then the word is added and the
+	 * line length increased.
+	 * 
+	 * @param word
+	 *            - the word to try to add.
+	 * @return {@code true} if the word has successfully been added to the line.
+	 */
+	protected boolean attemptToAddWord(Word word) {
+		double additionalLength = word.getWordWidth();
+		additionalLength += !words.isEmpty() ? spaceSize : 0;
+		if (currentLineLength + additionalLength <= maxLength) {
+			words.add(word);
+			currentLineLength += additionalLength;
+			return true;
+		} else {
+			return false;
+		}
+	}
+
+	/**
+	 * @return The max length of the line.
+	 */
+	protected double getMaxLength() {
+		return maxLength;
+	}
+
+	/**
+	 * @return The current screen-space length of the line.
+	 */
+	protected double getLineLength() {
+		return currentLineLength;
+	}
+
+	/**
+	 * @return The list of words in the line.
+	 */
+	protected List<Word> getWords() {
+		return words;
+	}
+
+}

client/src/main/java/nl/andrewl/aos2_client/render/font/MetaFile.java

@@ -0,0 +1,213 @@
+package nl.andrewl.aos2_client.render.font;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.IOException;
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * Provides functionality for getting the values from a font file.
+ * 
+ * @author Karl
+ *
+ */
+public class MetaFile {
+
+	private static final int PAD_TOP = 0;
+	private static final int PAD_LEFT = 1;
+	private static final int PAD_BOTTOM = 2;
+	private static final int PAD_RIGHT = 3;
+
+	private static final int DESIRED_PADDING = 3;
+
+	private static final String SPLITTER = " ";
+	private static final String NUMBER_SEPARATOR = ",";
+
+	private final double aspectRatio;
+
+	private double verticalPerPixelSize;
+	private double horizontalPerPixelSize;
+	private double spaceWidth;
+	private int[] padding;
+	private int paddingWidth;
+	private int paddingHeight;
+
+	private final Map<Integer, Character> metaData = new HashMap<>();
+
+	private BufferedReader reader;
+	private final Map<String, String> values = new HashMap<>();
+
+	/**
+	 * Opens a font file in preparation for reading.
+	 * 
+	 * @param file
+	 *            - the font file.
+	 */
+	protected MetaFile(File file, float aspectRatio) {
+		this.aspectRatio = aspectRatio;
+		openFile(file);
+		loadPaddingData();
+		loadLineSizes();
+		int imageWidth = getValueOfVariable("scaleW");
+		loadCharacterData(imageWidth);
+		close();
+	}
+
+	protected double getSpaceWidth() {
+		return spaceWidth;
+	}
+
+	protected Character getCharacter(int ascii) {
+		return metaData.get(ascii);
+	}
+
+	/**
+	 * Read in the next line and store the variable values.
+	 * 
+	 * @return {@code true} if the end of the file hasn't been reached.
+	 */
+	private boolean processNextLine() {
+		values.clear();
+		String line = null;
+		try {
+			line = reader.readLine();
+		} catch (IOException e1) {
+		}
+		if (line == null) {
+			return false;
+		}
+		for (String part : line.split(SPLITTER)) {
+			String[] valuePairs = part.split("=");
+			if (valuePairs.length == 2) {
+				values.put(valuePairs[0], valuePairs[1]);
+			}
+		}
+		return true;
+	}
+
+	/**
+	 * Gets the {@code int} value of the variable with a certain name on the
+	 * current line.
+	 * 
+	 * @param variable
+	 *            - the name of the variable.
+	 * @return The value of the variable.
+	 */
+	private int getValueOfVariable(String variable) {
+		return Integer.parseInt(values.get(variable));
+	}
+
+	/**
+	 * Gets the array of ints associated with a variable on the current line.
+	 * 
+	 * @param variable
+	 *            - the name of the variable.
+	 * @return The int array of values associated with the variable.
+	 */
+	private int[] getValuesOfVariable(String variable) {
+		String[] numbers = values.get(variable).split(NUMBER_SEPARATOR);
+		int[] actualValues = new int[numbers.length];
+		for (int i = 0; i < actualValues.length; i++) {
+			actualValues[i] = Integer.parseInt(numbers[i]);
+		}
+		return actualValues;
+	}
+
+	/**
+	 * Closes the font file after finishing reading.
+	 */
+	private void close() {
+		try {
+			reader.close();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+	/**
+	 * Opens the font file, ready for reading.
+	 * 
+	 * @param file
+	 *            - the font file.
+	 */
+	private void openFile(File file) {
+		try {
+			reader = new BufferedReader(new FileReader(file));
+		} catch (Exception e) {
+			e.printStackTrace();
+			System.err.println("Couldn't read font meta file!");
+		}
+	}
+
+	/**
+	 * Loads the data about how much padding is used around each character in
+	 * the texture atlas.
+	 */
+	private void loadPaddingData() {
+		processNextLine();
+		this.padding = getValuesOfVariable("padding");
+		this.paddingWidth = padding[PAD_LEFT] + padding[PAD_RIGHT];
+		this.paddingHeight = padding[PAD_TOP] + padding[PAD_BOTTOM];
+	}
+
+	/**
+	 * Loads information about the line height for this font in pixels, and uses
+	 * this as a way to find the conversion rate between pixels in the texture
+	 * atlas and screen-space.
+	 */
+	private void loadLineSizes() {
+		processNextLine();
+		int lineHeightPixels = getValueOfVariable("lineHeight") - paddingHeight;
+		verticalPerPixelSize = TextMeshCreator.LINE_HEIGHT / (double) lineHeightPixels;
+		horizontalPerPixelSize = verticalPerPixelSize / aspectRatio;
+	}
+
+	/**
+	 * Loads in data about each character and stores the data in the
+	 * {@link Character} class.
+	 * 
+	 * @param imageWidth
+	 *            - the width of the texture atlas in pixels.
+	 */
+	private void loadCharacterData(int imageWidth) {
+		processNextLine();
+		processNextLine();
+		while (processNextLine()) {
+			Character c = loadCharacter(imageWidth);
+			if (c != null) {
+				metaData.put(c.getId(), c);
+			}
+		}
+	}
+
+	/**
+	 * Loads all the data about one character in the texture atlas and converts
+	 * it all from 'pixels' to 'screen-space' before storing. The effects of
+	 * padding are also removed from the data.
+	 * 
+	 * @param imageSize
+	 *            - the size of the texture atlas in pixels.
+	 * @return The data about the character.
+	 */
+	private Character loadCharacter(int imageSize) {
+		int id = getValueOfVariable("id");
+		if (id == TextMeshCreator.SPACE_ASCII) {
+			this.spaceWidth = (getValueOfVariable("xadvance") - paddingWidth) * horizontalPerPixelSize;
+			return null;
+		}
+		double xTex = ((double) getValueOfVariable("x") + (padding[PAD_LEFT] - DESIRED_PADDING)) / imageSize;
+		double yTex = ((double) getValueOfVariable("y") + (padding[PAD_TOP] - DESIRED_PADDING)) / imageSize;
+		int width = getValueOfVariable("width") - (paddingWidth - (2 * DESIRED_PADDING));
+		int height = getValueOfVariable("height") - ((paddingHeight) - (2 * DESIRED_PADDING));
+		double quadWidth = width * horizontalPerPixelSize;
+		double quadHeight = height * verticalPerPixelSize;
+		double xTexSize = (double) width / imageSize;
+		double yTexSize = (double) height / imageSize;
+		double xOff = (getValueOfVariable("xoffset") + padding[PAD_LEFT] - DESIRED_PADDING) * horizontalPerPixelSize;
+		double yOff = (getValueOfVariable("yoffset") + (padding[PAD_TOP] - DESIRED_PADDING)) * verticalPerPixelSize;
+		double xAdvance = (getValueOfVariable("xadvance") - paddingWidth) * horizontalPerPixelSize;
+		return new Character(id, xTex, yTex, xTexSize, yTexSize, xOff, yOff, quadWidth, quadHeight, xAdvance);
+	}
+}

client/src/main/java/nl/andrewl/aos2_client/render/font/TextMeshCreator.java

@@ -0,0 +1,133 @@
+package nl.andrewl.aos2_client.render.font;
+
+import java.io.File;
+import java.util.ArrayList;
+import java.util.List;
+
+public class TextMeshCreator {
+
+	protected static final double LINE_HEIGHT = 0.03f;
+	protected static final int SPACE_ASCII = 32;
+
+	private final MetaFile metaData;
+
+	protected TextMeshCreator(File metaFile, float aspectRatio) {
+		metaData = new MetaFile(metaFile, aspectRatio);
+	}
+
+	protected TextMeshData createTextMesh(GUIText text) {
+		List<Line> lines = createStructure(text);
+		return createQuadVertices(text, lines);
+	}
+
+	private List<Line> createStructure(GUIText text) {
+		char[] chars = text.getTextString().toCharArray();
+		List<Line> lines = new ArrayList<Line>();
+		Line currentLine = new Line(metaData.getSpaceWidth(), text.getFontSize(), text.getMaxLineSize());
+		Word currentWord = new Word(text.getFontSize());
+		for (char c : chars) {
+			if ((int) c == SPACE_ASCII) {
+				boolean added = currentLine.attemptToAddWord(currentWord);
+				if (!added) {
+					lines.add(currentLine);
+					currentLine = new Line(metaData.getSpaceWidth(), text.getFontSize(), text.getMaxLineSize());
+					currentLine.attemptToAddWord(currentWord);
+				}
+				currentWord = new Word(text.getFontSize());
+				continue;
+			}
+			Character character = metaData.getCharacter(c);
+			currentWord.addCharacter(character);
+		}
+		completeStructure(lines, currentLine, currentWord, text);
+		return lines;
+	}
+
+	private void completeStructure(List<Line> lines, Line currentLine, Word currentWord, GUIText text) {
+		boolean added = currentLine.attemptToAddWord(currentWord);
+		if (!added) {
+			lines.add(currentLine);
+			currentLine = new Line(metaData.getSpaceWidth(), text.getFontSize(), text.getMaxLineSize());
+			currentLine.attemptToAddWord(currentWord);
+		}
+		lines.add(currentLine);
+	}
+
+	private TextMeshData createQuadVertices(GUIText text, List<Line> lines) {
+		text.setNumberOfLines(lines.size());
+		double curserX = 0f;
+		double curserY = 0f;
+		List<Float> vertices = new ArrayList<Float>();
+		List<Float> textureCoords = new ArrayList<Float>();
+		for (Line line : lines) {
+			if (text.isCentered()) {
+				curserX = (line.getMaxLength() - line.getLineLength()) / 2;
+			}
+			for (Word word : line.getWords()) {
+				for (Character letter : word.getCharacters()) {
+					addVerticesForCharacter(curserX, curserY, letter, text.getFontSize(), vertices);
+					addTexCoords(textureCoords, letter.getxTextureCoord(), letter.getyTextureCoord(),
+							letter.getXMaxTextureCoord(), letter.getYMaxTextureCoord());
+					curserX += letter.getxAdvance() * text.getFontSize();
+				}
+				curserX += metaData.getSpaceWidth() * text.getFontSize();
+			}
+			curserX = 0;
+			curserY += LINE_HEIGHT * text.getFontSize();
+		}		
+		return new TextMeshData(listToArray(vertices), listToArray(textureCoords));
+	}
+
+	private void addVerticesForCharacter(double curserX, double curserY, Character character, double fontSize,
+										 List<Float> vertices) {
+		double x = curserX + (character.getxOffset() * fontSize);
+		double y = curserY + (character.getyOffset() * fontSize);
+		double maxX = x + (character.getSizeX() * fontSize);
+		double maxY = y + (character.getSizeY() * fontSize);
+		double properX = (2 * x) - 1;
+		double properY = (-2 * y) + 1;
+		double properMaxX = (2 * maxX) - 1;
+		double properMaxY = (-2 * maxY) + 1;
+		addVertices(vertices, properX, properY, properMaxX, properMaxY);
+	}
+
+	private static void addVertices(List<Float> vertices, double x, double y, double maxX, double maxY) {
+		vertices.add((float) x);
+		vertices.add((float) y);
+		vertices.add((float) x);
+		vertices.add((float) maxY);
+		vertices.add((float) maxX);
+		vertices.add((float) maxY);
+		vertices.add((float) maxX);
+		vertices.add((float) maxY);
+		vertices.add((float) maxX);
+		vertices.add((float) y);
+		vertices.add((float) x);
+		vertices.add((float) y);
+	}
+
+	private static void addTexCoords(List<Float> texCoords, double x, double y, double maxX, double maxY) {
+		texCoords.add((float) x);
+		texCoords.add((float) y);
+		texCoords.add((float) x);
+		texCoords.add((float) maxY);
+		texCoords.add((float) maxX);
+		texCoords.add((float) maxY);
+		texCoords.add((float) maxX);
+		texCoords.add((float) maxY);
+		texCoords.add((float) maxX);
+		texCoords.add((float) y);
+		texCoords.add((float) x);
+		texCoords.add((float) y);
+	}
+
+	
+	private static float[] listToArray(List<Float> listOfFloats) {
+		float[] array = new float[listOfFloats.size()];
+		for (int i = 0; i < array.length; i++) {
+			array[i] = listOfFloats.get(i);
+		}
+		return array;
+	}
+
+}

client/src/main/java/nl/andrewl/aos2_client/render/font/TextMeshData.java

@@ -0,0 +1,30 @@
+package nl.andrewl.aos2_client.render.font;
+
+/**
+ * Stores the vertex data for all the quads on which a text will be rendered.
+ * @author Karl
+ *
+ */
+public class TextMeshData {
+	
+	private final float[] vertexPositions;
+	private final float[] textureCoords;
+	
+	protected TextMeshData(float[] vertexPositions, float[] textureCoords){
+		this.vertexPositions = vertexPositions;
+		this.textureCoords = textureCoords;
+	}
+
+	public float[] getVertexPositions() {
+		return vertexPositions;
+	}
+
+	public float[] getTextureCoords() {
+		return textureCoords;
+	}
+
+	public int getVertexCount() {
+		return vertexPositions.length/2;
+	}
+
+}

client/src/main/java/nl/andrewl/aos2_client/render/font/Word.java

@@ -0,0 +1,48 @@
+package nl.andrewl.aos2_client.render.font;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * During the loading of a text this represents one word in the text.
+ * @author Karl
+ *
+ */
+public class Word {
+	
+	private final List<Character> characters = new ArrayList<>();
+	private double width = 0;
+	private final double fontSize;
+	
+	/**
+	 * Create a new empty word.
+	 * @param fontSize - the font size of the text which this word is in.
+	 */
+	protected Word(double fontSize){
+		this.fontSize = fontSize;
+	}
+	
+	/**
+	 * Adds a character to the end of the current word and increases the screen-space width of the word.
+	 * @param character - the character to be added.
+	 */
+	protected void addCharacter(Character character){
+		characters.add(character);
+		width += character.getxAdvance() * fontSize;
+	}
+	
+	/**
+	 * @return The list of characters in the word.
+	 */
+	protected List<Character> getCharacters(){
+		return characters;
+	}
+	
+	/**
+	 * @return The width of the word in terms of screen size.
+	 */
+	protected double getWordWidth(){
+		return width;
+	}
+
+}

client/src/main/resources/text/jetbrains-mono.fnt

@@ -0,0 +1,102 @@
+info face="JetBrains Mono Regular" size=74 bold=0 italic=0 charset="" unicode=0 stretchH=100 smooth=1 aa=1 padding=3,3,3,3 spacing=0,0
+common lineHeight=105 base=76 scaleW=512 scaleH=512 pages=1 packed=0
+page id=0 file="jetbrains-mono.png"
+chars count=97
+char id=0       x=0    y=444  width=48   height=26   xoffset=-1   yoffset=36   xadvance=50   page=0    chnl=0 
+char id=10      x=0    y=0    width=0    height=0    xoffset=-3   yoffset=0    xadvance=6    page=0    chnl=0 
+char id=32      x=0    y=0    width=0    height=0    xoffset=-3   yoffset=0    xadvance=50   page=0    chnl=0 
+char id=33      x=490  y=82   width=18   height=62   xoffset=13   yoffset=18   xadvance=50   page=0    chnl=0 
+char id=34      x=457  y=396  width=29   height=29   xoffset=8    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=36      x=0    y=0    width=41   height=82   xoffset=2    yoffset=7    xadvance=50   page=0    chnl=0 
+char id=37      x=312  y=151  width=49   height=62   xoffset=-2   yoffset=18   xadvance=50   page=0    chnl=0 
+char id=38      x=368  y=82   width=44   height=63   xoffset=1    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=39      x=486  y=396  width=14   height=29   xoffset=15   yoffset=18   xadvance=50   page=0    chnl=0 
+char id=40      x=77   y=0    width=29   height=78   xoffset=10   yoffset=10   xadvance=50   page=0    chnl=0 
+char id=41      x=106  y=0    width=29   height=78   xoffset=5    yoffset=10   xadvance=50   page=0    chnl=0 
+char id=42      x=290  y=396  width=46   height=45   xoffset=-1   yoffset=27   xadvance=50   page=0    chnl=0 
+char id=43      x=336  y=396  width=42   height=41   xoffset=1    yoffset=31   xadvance=50   page=0    chnl=0 
+char id=44      x=483  y=0    width=22   height=30   xoffset=9    yoffset=61   xadvance=50   page=0    chnl=0 
+char id=45      x=179  y=444  width=31   height=12   xoffset=7    yoffset=45   xadvance=50   page=0    chnl=0 
+char id=46      x=137  y=444  width=19   height=19   xoffset=13   yoffset=61   xadvance=50   page=0    chnl=0 
+char id=47      x=149  y=0    width=40   height=77   xoffset=2    yoffset=10   xadvance=50   page=0    chnl=0 
+char id=48      x=328  y=82   width=40   height=63   xoffset=2    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=49      x=460  y=274  width=40   height=61   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=50      x=77   y=151  width=40   height=62   xoffset=2    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=51      x=117  y=151  width=39   height=62   xoffset=2    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=52      x=0    y=335  width=38   height=61   xoffset=2    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=53      x=156  y=151  width=39   height=62   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=54      x=195  y=151  width=42   height=62   xoffset=1    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=55      x=38   y=335  width=42   height=61   xoffset=2    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=56      x=286  y=82   width=42   height=63   xoffset=1    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=57      x=237  y=151  width=42   height=62   xoffset=1    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=58      x=483  y=151  width=19   height=49   xoffset=13   yoffset=31   xadvance=50   page=0    chnl=0 
+char id=59      x=477  y=213  width=23   height=60   xoffset=9    yoffset=31   xadvance=50   page=0    chnl=0 
+char id=60      x=0    y=0    width=0    height=0    xoffset=3    yoffset=0    xadvance=50   page=0    chnl=0 
+char id=61      x=418  y=396  width=39   height=30   xoffset=3    yoffset=36   xadvance=50   page=0    chnl=0 
+char id=62      x=165  y=335  width=110  height=50   xoffset=3    yoffset=27   xadvance=50   page=0    chnl=0 
+char id=63      x=279  y=151  width=33   height=62   xoffset=6    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=64      x=396  y=0    width=45   height=75   xoffset=0    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=65      x=361  y=151  width=44   height=61   xoffset=0    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=66      x=405  y=151  width=40   height=61   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=67      x=129  y=82   width=39   height=63   xoffset=3    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=68      x=445  y=151  width=38   height=61   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=69      x=0    y=213  width=38   height=61   xoffset=4    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=70      x=38   y=213  width=38   height=61   xoffset=4    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=71      x=168  y=82   width=39   height=63   xoffset=3    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=72      x=76   y=213  width=38   height=61   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=73      x=114  y=213  width=36   height=61   xoffset=4    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=74      x=412  y=82   width=40   height=62   xoffset=0    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=75      x=150  y=213  width=42   height=61   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=76      x=192  y=213  width=38   height=61   xoffset=6    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=77      x=230  y=213  width=40   height=61   xoffset=2    yoffset=18   xadvance=50   page=0    chnl=0 
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+char id=79      x=207  y=82   width=38   height=63   xoffset=3    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=80      x=308  y=213  width=41   height=61   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=81      x=356  y=0    width=40   height=75   xoffset=2    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=82      x=349  y=213  width=41   height=61   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=83      x=245  y=82   width=41   height=63   xoffset=2    yoffset=17   xadvance=50   page=0    chnl=0 
+char id=84      x=390  y=213  width=43   height=61   xoffset=1    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=85      x=452  y=82   width=38   height=62   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=86      x=433  y=213  width=44   height=61   xoffset=0    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=87      x=0    y=274  width=48   height=61   xoffset=-2   yoffset=18   xadvance=50   page=0    chnl=0 
+char id=88      x=48   y=274  width=46   height=61   xoffset=-1   yoffset=18   xadvance=50   page=0    chnl=0 
+char id=89      x=94   y=274  width=46   height=61   xoffset=-1   yoffset=18   xadvance=50   page=0    chnl=0 
+char id=90      x=140  y=274  width=39   height=61   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=91      x=229  y=0    width=25   height=76   xoffset=12   yoffset=11   xadvance=50   page=0    chnl=0 
+char id=92      x=189  y=0    width=40   height=77   xoffset=2    yoffset=10   xadvance=50   page=0    chnl=0 
+char id=93      x=254  y=0    width=25   height=76   xoffset=8    yoffset=11   xadvance=50   page=0    chnl=0 
+char id=94      x=378  y=396  width=40   height=36   xoffset=2    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=95      x=0    y=82   width=129  height=69   xoffset=1    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=96      x=156  y=444  width=23   height=17   xoffset=8    yoffset=14   xadvance=50   page=0    chnl=0 
+char id=97      x=275  y=335  width=40   height=49   xoffset=1    yoffset=31   xadvance=50   page=0    chnl=0 
+char id=98      x=0    y=151  width=39   height=62   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=99      x=315  y=335  width=39   height=49   xoffset=3    yoffset=31   xadvance=50   page=0    chnl=0 
+char id=100     x=39   y=151  width=38   height=62   xoffset=3    yoffset=18   xadvance=50   page=0    chnl=0 
+char id=101     x=354  y=335  width=39   height=49   xoffset=3    yoffset=31   xadvance=50   page=0    chnl=0 
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+char id=106     x=41   y=0    width=36   height=78   xoffset=2    yoffset=14   xadvance=50   page=0    chnl=0 
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+char id=108     x=338  y=274  width=45   height=61   xoffset=-1   yoffset=18   xadvance=50   page=0    chnl=0 
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+char id=112     x=383  y=274  width=39   height=61   xoffset=3    yoffset=31   xadvance=50   page=0    chnl=0 
+char id=113     x=422  y=274  width=38   height=61   xoffset=3    yoffset=31   xadvance=50   page=0    chnl=0 
+char id=114     x=42   y=396  width=38   height=48   xoffset=5    yoffset=31   xadvance=50   page=0    chnl=0 
+char id=115     x=432  y=335  width=39   height=49   xoffset=3    yoffset=31   xadvance=50   page=0    chnl=0 
+char id=116     x=124  y=335  width=41   height=59   xoffset=1    yoffset=20   xadvance=50   page=0    chnl=0 
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+char id=121     x=80   y=335  width=44   height=60   xoffset=0    yoffset=32   xadvance=50   page=0    chnl=0 
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+char id=123     x=279  y=0    width=39   height=76   xoffset=2    yoffset=11   xadvance=50   page=0    chnl=0 
+char id=124     x=135  y=0    width=14   height=77   xoffset=15   yoffset=10   xadvance=50   page=0    chnl=0 
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+char id=127     x=48   y=444  width=48   height=25   xoffset=-1   yoffset=36   xadvance=50   page=0    chnl=0 
+kernings count=0

core/src/main/java/nl/andrewl/aos_core/model/Chunk.java

@@ -126,14 +126,4 @@ public class Chunk {
 		}
 		return c;
 	}
-
-	public static Vector3f getColor(byte blockValue) {
-		float v = blockValue / 127.0f;
-		return new Vector3f(v);
-	}
-
-	public static void getColor(byte blockValue, Vector3f vec) {
-		float v = blockValue / 127.0f;
-		vec.set(v);
-	}
 }

core/src/main/java/nl/andrewl/aos_core/model/World.java

@@ -56,9 +56,7 @@ public class World {
 		getChunkPosAt(pos, util);
 		Chunk chunk = chunkMap.get(util);
 		if (chunk == null) return 0;
-		util.x = (int) Math.floor(pos.x - util.x * Chunk.SIZE);
+		getLocalPosAt(pos.x, pos.y, pos.z, util);
-		util.y = (int) Math.floor(pos.y - util.y * Chunk.SIZE);
-		util.z = (int) Math.floor(pos.z - util.z * Chunk.SIZE);
 		return chunk.getBlockAt(util);
 	}
 
@@ -70,11 +68,7 @@ public class World {
 		Vector3i chunkPos = getChunkPosAt(pos);
 		Chunk chunk = chunkMap.get(chunkPos);
 		if (chunk == null) return;
-		Vector3i blockPos = new Vector3i(
+		Vector3i blockPos = getLocalPosAt(pos.x, pos.y, pos.z, chunkPos);
-				(int) Math.floor(pos.x - chunkPos.x * Chunk.SIZE),
-				(int) Math.floor(pos.y - chunkPos.y * Chunk.SIZE),
-				(int) Math.floor(pos.z - chunkPos.z * Chunk.SIZE)
-		);
 		chunk.setBlockAt(blockPos.x, blockPos.y, blockPos.z, block);
 	}
 
@@ -86,6 +80,10 @@ public class World {
 		return chunkMap.get(chunkPos);
 	}
 
+	public Chunk getChunkAt(int x, int y, int z) {
+		return chunkMap.get(new Vector3i(x, y, z));
+	}
+
 	/**
 	 * Gets the position that a system is looking at, within a distance limit.
 	 * Usually used to determine where a player has interacted/clicked in the
@@ -157,18 +155,52 @@ public class World {
 	}
 
 	/**
-	 * Gets the coordinates of a chunk at a given world position.
+	 * Gets the chunk position at the specified world position.
-	 * @param worldPos The world position.
+	 * @param x The x coordinate.
-	 * @return The chunk position. Note that this may not correspond to any existing chunk.
+	 * @param y The y coordinate.
+	 * @param z The z coordinate.
+	 * @param dest The destination vector to place the chunk position in.
+	 * @return The destination vector, for method chaining.
 	 */
+	public static Vector3i getChunkPosAt(float x, float y, float z, Vector3i dest) {
+		dest.x = (int) Math.floor(x / Chunk.SIZE);
+		dest.y = (int) Math.floor(y / Chunk.SIZE);
+		dest.z = (int) Math.floor(z / Chunk.SIZE);
+		return dest;
+	}
+
+	public static Vector3i getChunkPosAt(Vector3f worldPos, Vector3i dest) {
+		return getChunkPosAt(worldPos.x, worldPos.y, worldPos.z, dest);
+	}
+
 	public static Vector3i getChunkPosAt(Vector3f worldPos) {
 		return getChunkPosAt(worldPos, new Vector3i());
 	}
 
-	public static Vector3i getChunkPosAt(Vector3f worldPos, Vector3i dest) {
+	public static Vector3i getChunkPosAt(Vector3i worldPos) {
-		dest.x = (int) Math.floor(worldPos.x / Chunk.SIZE);
+		return getChunkPosAt(worldPos.x, worldPos.y, worldPos.z, new Vector3i());
-		dest.y = (int) Math.floor(worldPos.y / Chunk.SIZE);
+	}
-		dest.z = (int) Math.floor(worldPos.z / Chunk.SIZE);
+
+	/**
+	 * Gets the chunk-local position at the specified world position.
+	 * @param x The x coordinate.
+	 * @param y The y coordinate.
+	 * @param z The z coordinate.
+	 * @param dest The destination vector to place the local position in.
+	 * @return The destination vector, for method chaining.
+	 */
+	public static Vector3i getLocalPosAt(float x, float y, float z, Vector3i dest) {
+		getChunkPosAt(x, y, z, dest);
+		float chunkX = dest.x;
+		float chunkY = dest.y;
+		float chunkZ = dest.z;
+		dest.x = (int) Math.floor(x - chunkX * Chunk.SIZE);
+		dest.y = (int) Math.floor(y - chunkY * Chunk.SIZE);
+		dest.z = (int) Math.floor(z - chunkZ * Chunk.SIZE);
 		return dest;
 	}
+
+	public static Vector3i getLocalPosAt(Vector3i worldPos) {
+		return getLocalPosAt(worldPos.x, worldPos.y, worldPos.z, new Vector3i());
+	}
 }

core/src/main/java/nl/andrewl/aos_core/net/udp/ClientInputState.java

@@ -3,16 +3,21 @@ package nl.andrewl.aos_core.net.udp;
 import nl.andrewl.record_net.Message;
 
 /**
- * A message that' sent periodically by the client when the player's input
+ * A message that's sent periodically by the client when the player's input
  * changes.
  */
 public record ClientInputState(
 		int clientId,
+		// Movement
 		boolean forward,
 		boolean backward,
 		boolean left,
 		boolean right,
 		boolean jumping,
 		boolean crouching,
-		boolean sprinting
+		boolean sprinting,
+
+		// Interaction
+		boolean hitting, // Usually a "left-click" action.
+		boolean interacting // Usually a "right-click" action.
 ) implements Message {}

server/src/main/java/nl/andrewl/aos2_server/ServerPlayer.java

@@ -1,11 +1,14 @@
 package nl.andrewl.aos2_server;
 
+import nl.andrewl.aos_core.model.Chunk;
 import nl.andrewl.aos_core.model.Player;
 import nl.andrewl.aos_core.model.World;
+import nl.andrewl.aos_core.net.udp.ChunkUpdateMessage;
 import nl.andrewl.aos_core.net.udp.ClientInputState;
 import org.joml.Math;
 import org.joml.Vector2i;
 import org.joml.Vector3f;
+import org.joml.Vector3i;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -17,6 +20,8 @@ public class ServerPlayer extends Player {
 
 	public static final float HEIGHT = 1.8f;
 	public static final float HEIGHT_CROUCH = 1.4f;
+	public static final float EYE_HEIGHT = HEIGHT - 0.1f;
+	public static final float EYE_HEIGHT_CROUCH = HEIGHT_CROUCH - 0.1f;
 	public static final float WIDTH = 0.75f;
 	public static final float RADIUS = WIDTH / 2f;
 
@@ -28,13 +33,17 @@ public class ServerPlayer extends Player {
 	public static final float MOVEMENT_DECELERATION = 2f;
 	public static final float JUMP_SPEED = 8f;
 
+	public static final int BLOCK_REMOVE_COOLDOWN = 250;
+
 	private ClientInputState lastInputState;
+	private long lastBlockRemovedAt = 0;
+
 	private boolean updated = false;
 
 	public ServerPlayer(int id, String username) {
 		super(id, username);
 		// Initialize with a default state of no input.
-		lastInputState = new ClientInputState(id, false, false, false, false, false, false, false);
+		lastInputState = new ClientInputState(id, false, false, false, false, false, false, false, false, false);
 	}
 
 	public ClientInputState getLastInputState() {
@@ -49,13 +58,36 @@ public class ServerPlayer extends Player {
 		return updated;
 	}
 
-	public void tick(float dt, World world) {
+	public void tick(float dt, World world, Server server) {
+		long now = System.currentTimeMillis();
+		if (lastInputState.hitting() && now - lastBlockRemovedAt > BLOCK_REMOVE_COOLDOWN) {
+			Vector3f eyePos = new Vector3f(position);
+			eyePos.y += getEyeHeight();
+			Vector3i targetPos = world.getLookingAtPos(eyePos, viewVector, 10);
+			System.out.println(targetPos);
+			if (targetPos != null) {
+				Vector3i chunkPos = World.getChunkPosAt(targetPos);
+				Vector3i localPos = World.getLocalPosAt(targetPos);
+				world.setBlockAt(targetPos.x, targetPos.y, targetPos.z, (byte) 0);
+				lastBlockRemovedAt = now;
+				server.getPlayerManager().broadcastUdpMessage(new ChunkUpdateMessage(
+						chunkPos.x, chunkPos.y, chunkPos.z,
+						localPos.x, localPos.y, localPos.z,
+						(byte) 0
+				));
+			}
+		}
+		tickMovement(dt, world);
+	}
+
+	private void tickMovement(float dt, World world) {
 		updated = false; // Reset the updated flag. This will be set to true if the player was updated in this tick.
+		boolean grounded = isGrounded(world);
+		tickHorizontalVelocity(grounded);
 
 		if (isGrounded(world)) {
-			tickHorizontalVelocity();
 			if (lastInputState.jumping()) {
-				velocity.y = JUMP_SPEED;
+				velocity.y = JUMP_SPEED * (lastInputState.sprinting() ? 1.25f : 1f);
 				updated = true;
 			}
 		} else {
@@ -73,7 +105,7 @@ public class ServerPlayer extends Player {
 		}
 	}
 
-	private void tickHorizontalVelocity() {
+	private void tickHorizontalVelocity(boolean doDeceleration) {
 		Vector3f horizontalVelocity = new Vector3f(
 				velocity.x == velocity.x ? velocity.x : 0f,
 				0,
@@ -101,7 +133,7 @@ public class ServerPlayer extends Player {
 				horizontalVelocity.normalize(maxSpeed);
 			}
 			updated = true;
-		} else if (horizontalVelocity.lengthSquared() > 0) {
+		} else if (doDeceleration && horizontalVelocity.lengthSquared() > 0) {
 			Vector3f deceleration = new Vector3f(horizontalVelocity)
 					.negate().normalize()
 					.mul(Math.min(horizontalVelocity.length(), MOVEMENT_DECELERATION));
@@ -154,105 +186,144 @@ public class ServerPlayer extends Player {
 //				movement.x, movement.y, movement.z,
 //				nextTickPosition.x, nextTickPosition.y, nextTickPosition.z
 //		);
-		checkWallCollision(world, nextTickPosition, movement);
+		float height = getCurrentHeight();
-		checkCeilingCollision(world, nextTickPosition, movement);
+		float delta = 0.00001f;
-		checkFloorCollision(world, nextTickPosition, movement);
+		final Vector3f stepSize = new Vector3f(movement).normalize(1.0f);
+		// The number of steps we'll make towards the next tick position.
+		int stepCount = (int) Math.ceil(movement.length());
+		if (stepCount == 0) return; // No movement, so exit.
+		final Vector3f nextPos = new Vector3f(position);
+		final Vector3f lastPos = new Vector3f(position);
+		for (int i = 0; i < stepCount; i++) {
+			lastPos.set(nextPos);
+			nextPos.add(stepSize);
+			// If we shot past the next tick position, clamp it to that.
+			if (new Vector3f(nextPos).sub(position).length() > movement.length()) {
+				nextPos.set(nextTickPosition);
 			}
 
-	private void checkFloorCollision(World world, Vector3f nextTickPosition, Vector3f movement) {
+			// Check if we collide with anything at this new position.
-		// If the player is moving up or not falling out of their current y level, no point in checking.
-		if (velocity.y >= 0 || Math.floor(position.y) == Math.floor(nextTickPosition.y)) return;
-		float dropHeight = Math.abs(movement.y);
-		int steps = (int) Math.ceil(dropHeight);
-//		System.out.printf("  dropHeight=%.3f, steps=%d%n", dropHeight, steps);
-		// Get a vector describing how much we move for each 1 unit Y decreases.
-		Vector3f stepSize = new Vector3f(movement).div(dropHeight);
-		Vector3f potentialPosition = new Vector3f(position);
-		for (int i = 0; i < steps; i++) {
-			potentialPosition.add(stepSize);
-//			System.out.printf("  Checking: %.3f, %.3f, %.3f%n", potentialPosition.x, potentialPosition.y, potentialPosition.z);
-			if (getHorizontalSpaceOccupied(potentialPosition).stream()
-					.anyMatch(p -> world.getBlockAt(p.x, potentialPosition.y, p.y) != 0)) {
-//				System.out.println("    Occupied!");
-				position.y = Math.ceil(potentialPosition.y);
-				velocity.y = 0;
-				movement.y = 0;
-				updated = true;
-				return; // Exit before doing any extra work.
-			}
-		}
-	}
 
-	private void checkCeilingCollision(World world, Vector3f nextTickPosition, Vector3f movement) {
-		// If the player is moving down, or not moving out of their current y level, no point in checking.
-		if (velocity.y <= 0 || Math.floor(position.y) == Math.floor(nextTickPosition.y)) return;
-		float riseHeight = Math.abs(movement.y);
-		int steps = (int) Math.ceil(riseHeight);
-		Vector3f stepSize = new Vector3f(movement).div(riseHeight);
-		Vector3f potentialPosition = new Vector3f(position);
-		float playerHeight = lastInputState.crouching() ? HEIGHT_CROUCH : HEIGHT;
-		for (int i = 0; i < steps; i++) {
-			potentialPosition.add(stepSize);
-			if (getHorizontalSpaceOccupied(potentialPosition).stream()
-					.anyMatch(p -> world.getBlockAt(p.x, potentialPosition.y + playerHeight, p.y) != 0)) {
-				position.y = Math.floor(potentialPosition.y);
-				velocity.y = 0;
-				movement.y = 0;
-				updated = true;
-				return; // Exit before doing any extra work.
-			}
-		}
-	}
 
-	private void checkWallCollision(World world, Vector3f nextTickPosition, Vector3f movement) {
+			float playerBodyPrevMinZ = lastPos.z - RADIUS;
-		// If the player isn't moving horizontally, no point in checking.
+			float playerBodyPrevMaxZ = lastPos.z + RADIUS;
-		if (velocity.x == 0 && velocity.z == 0) return;
+			float playerBodyPrevMinX = lastPos.x - RADIUS;
-		Vector3f potentialPosition = new Vector3f(position);
+			float playerBodyPrevMaxX = lastPos.x + RADIUS;
-		Vector3f stepSize = new Vector3f(movement).normalize(); // Step by 1 meter each time. This will guarantee we check everything, no matter what.
+			float playerBodyPrevMinY = lastPos.y;
-		int steps = (int) Math.ceil(movement.length());
+			float playerBodyPrevMaxY = lastPos.y + height;
-		for (int i = 0; i < steps; i++) {
-			potentialPosition.add(stepSize);
-			float x = potentialPosition.x;
-			float y = potentialPosition.y + 1f;
-			float z = potentialPosition.z;
 
-			float borderMinZ = z - RADIUS;
+			float playerBodyMinZ = nextPos.z - RADIUS;
-			float borderMaxZ = z + RADIUS;
+			float playerBodyMaxZ = nextPos.z + RADIUS;
-			float borderMinX = x - RADIUS;
+			float playerBodyMinX = nextPos.x - RADIUS;
-			float borderMaxX = x + RADIUS;
+			float playerBodyMaxX = nextPos.x + RADIUS;
+			float playerBodyMinY = nextPos.y;
+			float playerBodyMaxY = nextPos.y + height;
 
-			// -Z
+			// Compute the bounds of all blocks the player is intersecting with.
-			if (world.getBlockAt(x, y, borderMinZ) != 0) {
+			int minX = (int) Math.floor(playerBodyMinX);
-				System.out.println("-z");
+			int minZ = (int) Math.floor(playerBodyMinZ);
-				position.z = Math.ceil(borderMinZ) + RADIUS;
+			int minY = (int) Math.floor(playerBodyMinY);
+			int maxX = (int) Math.floor(playerBodyMaxX);
+			int maxZ = (int) Math.floor(playerBodyMaxZ);
+			int maxY = (int) Math.floor(playerBodyMaxY);
+
+			for (int x = minX; x <= maxX; x++) {
+				for (int z = minZ; z <= maxZ; z++) {
+					for (int y = minY; y <= maxY; y++) {
+						byte block = world.getBlockAt(x, y, z);
+						if (block <= 0) continue; // We're not colliding with this block.
+						float blockMinY = (float) y;
+						float blockMaxY = (float) y + 1;
+						float blockMinX = (float) x;
+						float blockMaxX = (float) x + 1;
+						float blockMinZ = (float) z;
+						float blockMaxZ = (float) z + 1;
+
+						/*
+						To determine if the player is moving into the -Z side of a block:
+						- The player's max z position went from < blockMinZ to >= blockMinZ.
+						- The block to the -Z direction is air.
+						 */
+						boolean collidingWithNegativeZ = playerBodyPrevMaxZ < blockMinZ && playerBodyMaxZ >= blockMinZ && world.getBlockAt(x, y, z - 1) <= 0;
+						if (collidingWithNegativeZ) {
+							position.z = blockMinZ - RADIUS - delta;
 							velocity.z = 0;
 							movement.z = 0;
-				updated = true;
 						}
-			// +Z
+
-			if (world.getBlockAt(x, y, borderMaxZ) != 0) {
+						/*
-				System.out.println("+z");
+						To determine if the player is moving into the +Z side of a block:
-				position.z = Math.floor(borderMaxZ) - RADIUS;
+						- The player's min z position went from >= blockMaxZ to < blockMaxZ.
+						- The block to the +Z direction is air.
+						 */
+						boolean collidingWithPositiveZ = playerBodyPrevMinZ >= blockMaxZ && playerBodyMinZ < blockMaxZ && world.getBlockAt(x, y, z + 1) <= 0;
+						if (collidingWithPositiveZ) {
+							position.z = blockMaxZ + RADIUS + delta;
 							velocity.z = 0;
 							movement.z = 0;
-				updated = true;
 						}
-			// -X
+
-			if (world.getBlockAt(borderMinX, y, z) != 0) {
+						/*
-				System.out.println("-x");
+						To determine if the player is moving into the -X side of a block:
-				position.x = Math.ceil(borderMinX) + RADIUS;
+						- The player's max x position went from < blockMinX to >= blockMinX
-				velocity.x = 0;
+						- The block to the -X direction is air.
-				movement.z = 0;
+						 */
-				updated = true;
+						boolean collidingWithNegativeX = playerBodyPrevMaxX < blockMinX && playerBodyMaxX >= blockMinX && world.getBlockAt(x - 1, y, z) <= 0;
-			}
+						if (collidingWithNegativeX) {
-			// +X
+							position.x = blockMinX - RADIUS - delta;
-			if (world.getBlockAt(borderMaxX, y, z) != 0) {
-				System.out.println("+x");
-				position.x = Math.floor(borderMaxX) - RADIUS;
 							velocity.x = 0;
 							movement.x = 0;
+						}
+
+						/*
+						To determine if the player is moving into the +X side of a block:
+						- The player's min x position went from >= blockMaxX to < blockMaxX.
+						- The block to the +X direction is air.
+						 */
+						boolean collidingWithPositiveX = playerBodyPrevMinX >= blockMaxX && playerBodyMinX < blockMaxX && world.getBlockAt(x + 1, y, z) <= 0;
+						if (collidingWithPositiveX) {
+							position.x = blockMaxX + RADIUS + delta;
+							velocity.x = 0;
+							movement.x = 0;
+						}
+
+						/*
+						To determine if the player is moving down onto a block:
+						- The player's min y position went from >= blockMaxY to < blockMaxY
+						- The block above the current one is air.
+						 */
+						boolean collidingWithFloor = playerBodyPrevMinY >= blockMaxY && playerBodyMinY < blockMaxY && world.getBlockAt(x, y + 1, z) <= 0;
+						if (collidingWithFloor) {
+							position.y = blockMaxY;
+							velocity.y = 0;
+							movement.y = 0;
+						}
+
+						/*
+						To determine if the player is moving up into a block:
+						- The player's y position went from below blockMinY to >= blockMinY
+						- The block below the current one is air.
+						 */
+						boolean collidingWithCeiling = playerBodyPrevMaxY < blockMinY && playerBodyMaxY >= blockMinY && world.getBlockAt(x, y - 1, z) <= 0;
+						if (collidingWithCeiling) {
+							position.y = blockMinY - height - delta;
+							velocity.y = 0;
+							movement.y = 0;
+						}
+
 						updated = true;
 					}
 				}
 			}
+		}
+	}
+
+	public float getCurrentHeight() {
+		return lastInputState.crouching() ? HEIGHT_CROUCH : HEIGHT;
+	}
+
+	public float getEyeHeight() {
+		return lastInputState.crouching() ? EYE_HEIGHT_CROUCH : EYE_HEIGHT;
+	}
+
 }

server/src/main/java/nl/andrewl/aos2_server/WorldUpdater.java

@@ -56,7 +56,7 @@ public class WorldUpdater implements Runnable {
 
 	private void tick() {
 		for (var player : server.getPlayerManager().getPlayers()) {
-			player.tick(secondsPerTick, server.getWorld());
+			player.tick(secondsPerTick, server.getWorld(), server);
 			if (player.isUpdated()) server.getPlayerManager().broadcastUdpMessage(new PlayerUpdateMessage(
 					player.getId(),
 					player.getPosition().x, player.getPosition().y, player.getPosition().z,