Add biomes

connector/src/main/java/org/geysermc/connector/network/session/GeyserSession.java

@@ -41,6 +41,8 @@ import com.nukkitx.math.vector.Vector2f;
 import com.nukkitx.math.vector.Vector2i;
 import com.nukkitx.math.vector.Vector3f;
 import com.nukkitx.math.vector.Vector3i;
+import com.nukkitx.nbt.NbtUtils;
+import com.nukkitx.nbt.stream.NBTInputStream;
 import com.nukkitx.nbt.tag.CompoundTag;
 import com.nukkitx.protocol.bedrock.BedrockServerSession;
 import com.nukkitx.protocol.bedrock.data.GamePublishSetting;
@@ -53,6 +55,7 @@ import org.geysermc.api.RemoteServer;
 import org.geysermc.api.session.AuthData;
 import org.geysermc.api.window.FormWindow;
 import org.geysermc.connector.GeyserConnector;
+import org.geysermc.connector.console.GeyserLogger;
 import org.geysermc.connector.entity.PlayerEntity;
 import org.geysermc.connector.inventory.PlayerInventory;
 import org.geysermc.connector.network.session.cache.*;
@@ -60,6 +63,7 @@ import org.geysermc.connector.network.translators.Registry;
 import org.geysermc.connector.utils.ChunkUtils;
 import org.geysermc.connector.utils.Toolbox;
 
+import java.io.InputStream;
 import java.net.InetSocketAddress;
 import java.util.UUID;
 
@@ -131,7 +135,22 @@ public class GeyserSession implements Player {
         ChunkUtils.sendEmptyChunks(this, playerEntity.getPosition().toInt(), 0, false);
 
         BiomeDefinitionListPacket biomePacket = new BiomeDefinitionListPacket();
-        biomePacket.setTag(CompoundTag.EMPTY);
+        InputStream stream = GeyserConnector.class.getClassLoader().getResourceAsStream("bedrock/biome_definitions.dat");
+        if (stream == null) {
+            throw new AssertionError("Unable to find bedrock/biome_definitions.dat");
+        }
+
+        CompoundTag biomesTag;
+
+        NBTInputStream nbtInputStream = NbtUtils.createNetworkReader(stream);
+        try {
+            biomesTag = (CompoundTag) nbtInputStream.readTag();
+            biomePacket.setTag(biomesTag);
+            nbtInputStream.close();
+        } catch (Exception ex) {
+            GeyserLogger.DEFAULT.warning("Failed to get biomes from biome definitions, is there something wrong with the file?");
+            throw new AssertionError(ex);
+        }
         upstream.sendPacket(biomePacket);
 
         AvailableEntityIdentifiersPacket entityPacket = new AvailableEntityIdentifiersPacket();

connector/src/main/java/org/geysermc/connector/network/translators/BiomeTranslator.java

@@ -0,0 +1,35 @@
+package org.geysermc.connector.network.translators;
+import java.util.Arrays;
+
+//Based off of ProtocolSupport's LegacyBiomeData.java https://github.com/ProtocolSupport/ProtocolSupport/blob/b2cad35977f3fcb65bee57b9e14fc9c975f71d32/src/protocolsupport/protocol/typeremapper/legacy/LegacyBiomeData.java
+//Array index formula by https://wiki.vg/Chunk_Format
+
+public class BiomeTranslator {
+
+    public static byte[] toBedrockBiome(int[] biomeData) {
+        byte[] bedrockData = new byte[256];
+        if(biomeData == null) {
+            return bedrockData;
+        }
+
+        for (int z = 0; z < 16; z += 4) {
+            for (int x = 0; x < 16; x += 4) {
+                byte biomeId = biomeID(biomeData, x, z);
+                fillArray(z, x, bedrockData, biomeId);
+                fillArray(z + 1, x, bedrockData, biomeId);
+                fillArray(z + 2, x, bedrockData, biomeId);
+                fillArray(z + 3, x, bedrockData, biomeId);
+            }
+        }
+        return bedrockData;
+    }
+
+    protected static void fillArray(int z, int x, byte[] legacyBiomeData, int biomeId) {
+        int offset = (z << 4) | x;
+        Arrays.fill(legacyBiomeData, offset, offset + 4, (byte) biomeId);
+    }
+
+    protected static byte biomeID(int[] biomeData, int x, int z) {
+        return (byte) biomeData[((z >> 2) & 3) << 2 | ((x >> 2) & 3)];
+    }
+}

connector/src/main/java/org/geysermc/connector/network/translators/java/world/JavaChunkDataTranslator.java

@@ -35,6 +35,7 @@ import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import org.geysermc.api.Geyser;
 import org.geysermc.connector.network.session.GeyserSession;
+import org.geysermc.connector.network.translators.BiomeTranslator;
 import org.geysermc.connector.network.translators.PacketTranslator;
 import org.geysermc.connector.utils.ChunkUtils;
 import org.geysermc.connector.world.chunk.ChunkSection;
@@ -74,7 +75,9 @@ public class JavaChunkDataTranslator extends PacketTranslator<ServerChunkDataPac
                     section.writeToNetwork(byteBuf);
                 }
 
-                byteBuf.writeBytes(chunkData.biomes); // Biomes - 256 bytes
+                byte[] bedrockBiome = BiomeTranslator.toBedrockBiome(packet.getColumn().getBiomeData());
+
+                byteBuf.writeBytes(bedrockBiome); // Biomes - 256 bytes
                 byteBuf.writeByte(0); // Border blocks - Edu edition only
                 VarInts.writeUnsignedInt(byteBuf, 0); // extra data length, 0 for now
 

connector/src/main/java/org/geysermc/connector/utils/ChunkUtils.java

@@ -131,7 +131,6 @@ public class ChunkUtils {
     public static final class ChunkData {
         public ChunkSection[] sections;
 
-        public byte[] biomes = new byte[256];
         public byte[] blockEntities = new byte[0];
     }
 }