Implemented damage types and void below world

src/main/java/fr/themode/demo/Main.java

@@ -2,6 +2,7 @@ package fr.themode.demo;
 
 import fr.themode.demo.blocks.StoneBlock;
 import fr.themode.demo.blocks.UpdatableBlockDemo;
+import fr.themode.demo.commands.GamemodeCommand;
 import fr.themode.demo.commands.HealthCommand;
 import fr.themode.demo.commands.SimpleCommand;
 import net.minestom.server.MinecraftServer;
@@ -32,6 +33,7 @@ public class Main {
         CommandManager commandManager = MinecraftServer.getCommandManager();
         commandManager.register(new HealthCommand());
         commandManager.register(new SimpleCommand());
+        commandManager.register(new GamemodeCommand());
 
         RecipeManager recipeManager = MinecraftServer.getRecipeManager();
         ShapelessRecipe shapelessRecipe = new ShapelessRecipe("test", "groupname") {

src/main/java/fr/themode/demo/PlayerInit.java

@@ -7,6 +7,7 @@ import net.minestom.server.MinecraftServer;
 import net.minestom.server.benchmark.BenchmarkManager;
 import net.minestom.server.benchmark.ThreadResult;
 import net.minestom.server.entity.*;
+import net.minestom.server.entity.damage.DamageType;
 import net.minestom.server.event.*;
 import net.minestom.server.instance.InstanceContainer;
 import net.minestom.server.inventory.Inventory;
@@ -97,7 +98,7 @@ public class PlayerInit {
                 Entity entity = event.getTarget();
                 if (entity instanceof EntityCreature) {
                     EntityCreature creature = (EntityCreature) entity;
-                    creature.damage(-1);
+                    creature.damage(DamageType.fromPlayer(player), -1);
                     Vector velocity = player.getPosition().clone().getDirection().multiply(6);
                     velocity.setY(4f);
                     entity.setVelocity(velocity, 150);
@@ -107,7 +108,7 @@ public class PlayerInit {
                     Vector velocity = player.getPosition().clone().getDirection().multiply(4);
                     velocity.setY(3.5f);
                     target.setVelocity(velocity, 150);
-                    target.damage(5);
+                    target.damage(DamageType.fromPlayer(player), 5);
                     player.sendMessage("ATTACK");
                 }
             });

src/main/java/fr/themode/demo/commands/GamemodeCommand.java

@@ -0,0 +1,73 @@
+package fr.themode.demo.commands;
+
+import fr.themode.command.Arguments;
+import fr.themode.command.Command;
+import fr.themode.command.arguments.Argument;
+import fr.themode.command.arguments.ArgumentType;
+import net.minestom.server.entity.GameMode;
+import net.minestom.server.entity.Player;
+
+import java.util.Optional;
+
+/**
+ * Command that make a player change gamemode
+ */
+public class GamemodeCommand extends Command<Player> {
+    public GamemodeCommand() {
+        super("gamemode", "g", "gm");
+
+        setCondition(this::isAllowed);
+
+        setDefaultExecutor(this::usage);
+
+        Argument player = ArgumentType.String("player");
+
+        GameMode[] gameModes = GameMode.values();
+        String[] names = new String[gameModes.length];
+        for (int i = 0; i < gameModes.length; i++) {
+            names[i] = gameModes[i].name().toLowerCase();
+        }
+        Argument mode = ArgumentType.Word("mode").from(names);
+
+        addCallback(this::gameModeCallback, mode);
+
+        addSyntax(this::executeOnSelf, mode);
+        addSyntax(this::executeOnOther, player, mode);
+    }
+
+    private void usage(Player player, Arguments arguments) {
+        player.sendMessage("Usage: /gamemode [player] <gamemode>");
+    }
+
+    private void executeOnSelf(Player player, Arguments arguments) {
+        String gamemodeName = arguments.getWord("mode");
+        GameMode mode = GameMode.valueOf(gamemodeName.toUpperCase());
+        assert mode != null; // mode is not supposed to be null, because gamemodeName will be valid
+        player.setGameMode(mode);
+        player.sendMessage("You are now playing in "+gamemodeName);
+
+        System.out.println("hello");
+    }
+
+    private void executeOnOther(Player player, Arguments arguments) {
+        String gamemodeName = arguments.getWord("mode");
+        String targetName = arguments.getString("player");
+        GameMode mode = GameMode.valueOf(gamemodeName.toUpperCase());
+        assert mode != null; // mode is not supposed to be null, because gamemodeName will be valid
+        Optional<Player> target = player.getInstance().getPlayers().stream().filter(p -> p.getUsername().equals(targetName)).findFirst();
+        if(target.isPresent()) {
+            target.get().setGameMode(mode);
+            target.get().sendMessage("You are now playing in "+gamemodeName);
+        } else {
+            player.sendMessage("'"+targetName+"' is not a valid player name.");
+        }
+    }
+
+    private void gameModeCallback(Player player, String gamemode, int error) {
+        player.sendMessage("'"+gamemode+"' is not a valid gamemode!");
+    }
+
+    private boolean isAllowed(Player player) {
+        return true; // TODO: permissions
+    }
+}

src/main/java/fr/themode/demo/commands/HealthCommand.java

@@ -28,7 +28,7 @@ public class HealthCommand extends Command<Player> {
     }
 
     private boolean condition(Player player) {
-        // Your custom condition, called no matter the syntax used
+        // TODO: Your custom condition, called no matter the syntax used
         boolean hasPerm = true;
         if (!hasPerm) {
             player.sendMessage("You do not have permission !");

src/main/java/net/minestom/server/entity/Entity.java

@@ -245,6 +245,7 @@ public abstract class Entity implements Viewable, DataContainer {
                 if (!isOnGround()) {
                     float strength = gravityDragPerTick * gravityTickCounter;
 
+                    boolean foundBlock = false;
                     int firstBlock = 0;
                     for (int y = (int) position.getY(); y > 0; y--) {
                         BlockPosition blockPosition = new BlockPosition(position.getX(), y, position.getZ());
@@ -253,6 +254,7 @@ public abstract class Entity implements Viewable, DataContainer {
                         //   System.out.println("id: " + blockId);
                         if (blockId != 0) {
                             firstBlock = y;
+                            foundBlock = true;
                             //System.out.println("first block: " + y);
                             break;
                         }
@@ -260,7 +262,10 @@ public abstract class Entity implements Viewable, DataContainer {
 
                     float newY = position.getY() - strength;
                     //System.out.println("REFRESH Y " + newY);
-                    newY = Math.max(newY, firstBlock);
+                    // allow entities to go below the world
+                    if(foundBlock) {
+                        newY = Math.max(newY, firstBlock);
+                    }
                     refreshPosition(position.getX(), newY, position.getZ());
                     gravityTickCounter++;
                     if (isOnGround()) { // Round Y axis when gravity movement is done
@@ -276,6 +281,8 @@ public abstract class Entity implements Viewable, DataContainer {
                 }
             }
 
+            handleVoid();
+
             // Call the abstract update method
             update();
 
@@ -291,6 +298,16 @@ public abstract class Entity implements Viewable, DataContainer {
         }
     }
 
+    /**
+     * How does this entity handle being in the void?
+     */
+    protected void handleVoid() {
+        // Kill if in void
+        if(getInstance().isInVoid(this.position)) {
+            remove();
+        }
+    }
+
     public <E extends Event> void setEventCallback(Class<E> eventClass, Callback<E> callback) {
         this.eventCallbacks.put(eventClass, callback);
     }

src/main/java/net/minestom/server/entity/GameMode.java

@@ -2,13 +2,15 @@ package net.minestom.server.entity;
 
 public enum GameMode {
 
-    SURVIVAL((byte) 0), CREATIVE((byte) 1), ADVENTURE((byte) 2), SPECTATOR((byte) 3);
+    SURVIVAL((byte) 0, true), CREATIVE((byte) 1, false), ADVENTURE((byte) 2, true), SPECTATOR((byte) 3, false);
 
     private byte id;
     private boolean hardcore;
+    private boolean canTakeDamage;
 
-    GameMode(byte id) {
+    GameMode(byte id, boolean canTakeDamage) {
         this.id = id;
+        this.canTakeDamage = canTakeDamage;
     }
 
     public void setHardcore(boolean hardcore) {
@@ -22,4 +24,8 @@ public enum GameMode {
     public boolean isHardcore() {
         return hardcore;
     }
+
+    public boolean canTakeDamage() {
+        return canTakeDamage;
+    }
 }

src/main/java/net/minestom/server/entity/LivingEntity.java

@@ -1,6 +1,7 @@
 package net.minestom.server.entity;
 
 import net.minestom.server.collision.BoundingBox;
+import net.minestom.server.entity.damage.DamageType;
 import net.minestom.server.entity.property.Attribute;
 import net.minestom.server.event.DeathEvent;
 import net.minestom.server.event.PickupItemEvent;
@@ -103,7 +104,10 @@ public abstract class LivingEntity extends Entity {
         callEvent(DeathEvent.class, deathEvent);
     }
 
-    public void damage(float value) {
+    public void damage(DamageType type, float value) {
+        if(isImmune(type)) {
+            return;
+        }
         EntityAnimationPacket entityAnimationPacket = new EntityAnimationPacket();
         entityAnimationPacket.entityId = getEntityId();
         entityAnimationPacket.animation = EntityAnimationPacket.Animation.TAKE_DAMAGE;
@@ -111,6 +115,15 @@ public abstract class LivingEntity extends Entity {
         setHealth(getHealth() - value);
     }
 
+    /**
+     * Is this entity immune to the given type of damage?
+     * @param type the type of damage
+     * @return true iff this entity is immune to the given type of damage
+     */
+    public boolean isImmune(DamageType type) {
+        return false;
+    }
+
     public float getHealth() {
         return health;
     }
@@ -195,4 +208,12 @@ public abstract class LivingEntity extends Entity {
             setAttribute(attribute, attribute.getDefaultValue());
         }
     }
+
+    @Override
+    protected void handleVoid() {
+        // Kill if in void
+        if(getInstance().isInVoid(this.position)) {
+            damage(DamageType.VOID, 10f);
+        }
+    }
 }

src/main/java/net/minestom/server/entity/Player.java

@@ -6,6 +6,7 @@ import net.minestom.server.MinecraftServer;
 import net.minestom.server.bossbar.BossBar;
 import net.minestom.server.chat.Chat;
 import net.minestom.server.collision.BoundingBox;
+import net.minestom.server.entity.damage.DamageType;
 import net.minestom.server.entity.property.Attribute;
 import net.minestom.server.entity.vehicle.PlayerVehicleInformation;
 import net.minestom.server.event.*;
@@ -406,11 +407,11 @@ public class Player extends LivingEntity {
     }
 
     @Override
-    public void damage(float value) {
-        if (getGameMode() == GameMode.CREATIVE)
-            return;
-
-        super.damage(value);
+    public boolean isImmune(DamageType type) {
+        if(getGameMode().canTakeDamage()) {
+            return type != DamageType.VOID;
+        }
+        return super.isImmune(type);
     }
 
     @Override
@@ -450,6 +451,11 @@ public class Player extends LivingEntity {
         return !itemDropEvent.isCancelled();
     }
 
+    public Position getRespawnPoint() {
+        // TODO: Custom
+        return new Position(0f, 70f, 0f);
+    }
+
     public void respawn() {
         if (!isDead())
             return;
@@ -460,7 +466,7 @@ public class Player extends LivingEntity {
         respawnPacket.gameMode = getGameMode();
         respawnPacket.levelType = getLevelType();
         getPlayerConnection().sendPacket(respawnPacket);
-        PlayerRespawnEvent respawnEvent = new PlayerRespawnEvent(getPosition());
+        PlayerRespawnEvent respawnEvent = new PlayerRespawnEvent(getRespawnPoint());
         callEvent(PlayerRespawnEvent.class, respawnEvent);
         refreshIsDead(false);
 
@@ -604,6 +610,14 @@ public class Player extends LivingEntity {
         return gameMode;
     }
 
+    /**
+     * Returns true iff this player is in creative. Used for code readability
+     * @return
+     */
+    public boolean isCreative() {
+        return gameMode == GameMode.CREATIVE;
+    }
+
     public void setDimension(Dimension dimension) {
         if (dimension == null)
             throw new IllegalArgumentException("Dimension cannot be null!");

src/main/java/net/minestom/server/entity/damage/DamageType.java

@@ -0,0 +1,19 @@
+package net.minestom.server.entity.damage;
+
+import net.minestom.server.entity.Player;
+
+/**
+ * Represents a type of damage
+ */
+public class DamageType {
+
+    // TODO
+
+    public static final DamageType VOID = new DamageType();
+    public static final DamageType PLAYER = new DamageType();
+
+    public static DamageType fromPlayer(Player player) {
+        // TODO
+        return PLAYER;
+    }
+}

src/main/java/net/minestom/server/instance/Chunk.java

@@ -140,17 +140,29 @@ public class Chunk implements Viewable {
     }
 
     public short getBlockId(int x, int y, int z) {
-        short id = blocksId[getBlockIndex(x, y, z)];
+        int index = getBlockIndex(x, y, z);
+        if(index < 0 || index >= blocksId.length) {
+            return 0; // TODO: custom invalid block
+        }
+        short id = blocksId[index];
         return id;
     }
 
     public short getCustomBlockId(int x, int y, int z) {
-        short id = customBlocksId[getBlockIndex(x, y, z)];
+        int index = getBlockIndex(x, y, z);
+        if(index < 0 || index >= blocksId.length) {
+            return 0; // TODO: custom invalid block
+        }
+        short id = customBlocksId[index];
         return id;
     }
 
     public CustomBlock getCustomBlock(int x, int y, int z) {
-        short id = customBlocksId[getBlockIndex(x, y, z)];
+        int index = getBlockIndex(x, y, z);
+        if(index < 0 || index >= blocksId.length) {
+            return null; // TODO: custom invalid block
+        }
+        short id = customBlocksId[index];
         return id != 0 ? BLOCK_MANAGER.getCustomBlock(id) : null;
     }
 
@@ -161,6 +173,9 @@ public class Chunk implements Viewable {
 
     protected void refreshBlockValue(int x, int y, int z, short blockId, short customId) {
         int blockIndex = getBlockIndex(x, y, z);
+        if(blockIndex < 0 || blockIndex >= blocksId.length) {
+            return;
+        }
 
         this.blocksId[blockIndex] = blockId;
         this.customBlocksId[blockIndex] = customId;

src/main/java/net/minestom/server/instance/Instance.java

@@ -88,6 +88,14 @@ public abstract class Instance implements BlockModifier, DataContainer {
 
     public abstract boolean hasEnabledAutoChunkLoad();
 
+    /**
+     * Determines whether a position in the void. If true, entities should take damage and die.
+     * Always returning false allow entities to survive in the void
+     * @param position the position in the world
+     * @return true iif position is inside the void
+     */
+    public abstract boolean isInVoid(Position position);
+
     //
     protected void sendChunkUpdate(Collection<Player> players, Chunk chunk) {
         ByteBuf chunkData = chunk.getFullDataPacket();

src/main/java/net/minestom/server/instance/InstanceContainer.java

@@ -16,6 +16,7 @@ import net.minestom.server.particle.Particle;
 import net.minestom.server.particle.ParticleCreator;
 import net.minestom.server.utils.BlockPosition;
 import net.minestom.server.utils.ChunkUtils;
+import net.minestom.server.utils.Position;
 import net.minestom.server.utils.SerializerUtils;
 
 import java.io.File;
@@ -330,6 +331,12 @@ public class InstanceContainer extends Instance {
         return autoChunkLoad;
     }
 
+    @Override
+    public boolean isInVoid(Position position) {
+        // TODO: customizable
+        return position.getY() < -64;
+    }
+
     protected void addSharedInstance(SharedInstance sharedInstance) {
         this.sharedInstances.add(sharedInstance);
     }

src/main/java/net/minestom/server/instance/SharedInstance.java

@@ -5,6 +5,7 @@ import net.minestom.server.entity.Player;
 import net.minestom.server.instance.batch.BlockBatch;
 import net.minestom.server.instance.batch.ChunkBatch;
 import net.minestom.server.utils.BlockPosition;
+import net.minestom.server.utils.Position;
 
 import java.io.File;
 import java.util.Collection;
@@ -133,6 +134,11 @@ public class SharedInstance extends Instance {
         return instanceContainer.hasEnabledAutoChunkLoad();
     }
 
+    @Override
+    public boolean isInVoid(Position position) {
+        return instanceContainer.isInVoid(position);
+    }
+
     @Override
     public void setBlock(int x, int y, int z, short blockId, Data data) {
         instanceContainer.setBlock(x, y, z, blockId, data);