WIP chunk packet

src/main/java/fr/themode/minestom/net/packet/client/login/LoginStartPacket.java

@@ -7,6 +7,7 @@ import fr.themode.minestom.net.ConnectionState;
 import fr.themode.minestom.net.packet.client.ClientPreplayPacket;
 import fr.themode.minestom.net.packet.server.login.JoinGamePacket;
 import fr.themode.minestom.net.packet.server.login.LoginSuccessPacket;
+import fr.themode.minestom.net.packet.server.play.ChunkDataPacket;
 import fr.themode.minestom.net.packet.server.play.SpawnPositionPacket;
 import fr.themode.minestom.net.player.PlayerConnection;
 import fr.themode.minestom.utils.Utils;
@@ -28,7 +29,7 @@ public class LoginStartPacket implements ClientPreplayPacket {
         // TODO complete login sequence with optionals packets
         JoinGamePacket joinGamePacket = new JoinGamePacket();
         joinGamePacket.entityId = 32;
-        joinGamePacket.gameMode = GameMode.SURVIVAL;
+        joinGamePacket.gameMode = GameMode.CREATIVE;
         joinGamePacket.dimension = Dimension.OVERWORLD;
         joinGamePacket.maxPlayers = 0;
         joinGamePacket.levelType = "default";
@@ -42,6 +43,27 @@ public class LoginStartPacket implements ClientPreplayPacket {
 
         // TODO player abilities
 
+        for (int x = 0; x < 8; x++) {
+            for (int z = 0; z < 8; z++) {
+                ChunkDataPacket.ChunkSection chunkSection = new ChunkDataPacket.ChunkSection();
+                chunkSection.bitsPerBlock = 13;
+                chunkSection.data = new long[]{0x1001880C0060020L, 0x200D0068004C020L, 0L};
+
+                ChunkDataPacket chunkDataPacket = new ChunkDataPacket();
+                chunkDataPacket.columnX = x;
+                chunkDataPacket.columnZ = z;
+                chunkDataPacket.fullChunk = true;
+                chunkDataPacket.mask = 0xFFFF; // 16 bits
+                ChunkDataPacket.ChunkSection[] sections = new ChunkDataPacket.ChunkSection[16];
+                for (int i = 0; i < 16; i++) {
+                    sections[i] = chunkSection;
+                }
+                chunkDataPacket.chunkSections = sections;
+
+                connection.sendPacket(chunkDataPacket);
+            }
+        }
+
         SpawnPositionPacket spawnPositionPacket = new SpawnPositionPacket();
         spawnPositionPacket.x = 50;
         spawnPositionPacket.y = 50;

src/main/java/fr/themode/minestom/net/packet/server/play/ChunkDataPacket.java

@@ -0,0 +1,98 @@
+package fr.themode.minestom.net.packet.server.play;
+
+import fr.adamaq01.ozao.net.Buffer;
+import fr.themode.minestom.net.packet.server.ServerPacket;
+import fr.themode.minestom.utils.Utils;
+
+public class ChunkDataPacket implements ServerPacket {
+
+    public int columnX;
+    public int columnZ;
+    public boolean fullChunk;
+    public int mask;
+    public ChunkSection[] chunkSections;
+    public int tileEntitesSize;
+    // TODO nbt tile entities
+
+    @Override
+    public void write(Buffer buffer) {
+        buffer.putInt(columnX);
+        buffer.putInt(columnZ);
+        buffer.putBoolean(fullChunk);
+        Utils.writeVarInt(buffer, mask);
+        System.out.println("test: " + getDataSize());
+        Utils.writeVarInt(buffer, getDataSize());
+        writeData(buffer);
+        Utils.writeVarInt(buffer, tileEntitesSize);
+        // TODO nbt tile entities
+    }
+
+    private int getDataSize() {
+        int result = Integer.BYTES * 256; // Size for 256 biomes value
+        for (int i = 0; i < chunkSections.length; i++) {
+            result += chunkSections[i].getSize();
+        }
+        return result;
+    }
+
+    private void writeData(Buffer buffer) {
+        for (ChunkSection chunkSection : chunkSections) {
+            chunkSection.write(buffer);
+        }
+        // Biomes data
+        for (int i = 0; i < 256; i++) {
+            buffer.putInt(127); // Void biome
+        }
+    }
+
+    @Override
+    public int getId() {
+        return 0x21;
+    }
+
+    public static class ChunkSection {
+
+        public byte bitsPerBlock;
+        public int paletteLength; // Optional
+        public int[] palette; // Optional
+        public long[] data;
+        public byte[] blockLight;
+        public byte[] skyLight;
+
+        public void write(Buffer buffer) {
+            buffer.putByte(bitsPerBlock);
+
+            if (bitsPerBlock < 9) {
+                Utils.writeVarInt(buffer, paletteLength);
+                for (int p : palette) {
+                    Utils.writeVarInt(buffer, p);
+                }
+            }
+
+            Utils.writeVarInt(buffer, data.length);
+            for (long d : data) {
+                buffer.putLong(d);
+            }
+            //buffer.putBytes(blockLight);
+            //buffer.putBytes(skyLight);
+        }
+
+        public int getSize() {
+            int size = 0;
+            size++; //bitsPerBlock
+            if (bitsPerBlock < 9) {
+                size += Utils.lengthVarInt(paletteLength);
+                for (int p : palette) {
+                    size += Utils.lengthVarInt(p);
+                }
+            }
+
+            size += Utils.lengthVarInt(data.length);
+            size += Long.BYTES * data.length;
+            //size += blockLight.length;
+            //size += skyLight.length;
+            return size;
+        }
+
+    }
+}

src/main/java/fr/themode/minestom/utils/Utils.java

@@ -75,6 +75,19 @@ public class Utils {
         return i;
     }
 
+    public static int lengthVarLong(long value) {
+        int i = 0;
+        do {
+            i++;
+            byte temp = (byte) (value & 0b01111111);
+            value >>>= 7;
+            if (value != 0) {
+                temp |= 0b10000000;
+            }
+        } while (value != 0);
+        return i;
+    }
+
     public static void writeVarLong(Buffer buffer, long value) {
         do {
             byte temp = (byte) (value & 0b01111111);