From b768ba5bd9ce778c3168ace02cbe8c7e09d2a3a5 Mon Sep 17 00:00:00 2001
From: DmitriyMX <dimon550@gmail.com>
Date: Sun, 2 May 2021 23:56:20 +0300
Subject: [PATCH] =?UTF-8?q?=D0=BE=D1=82=D0=BF=D1=80=D0=B0=D0=B2=D0=BA?=
 =?UTF-8?q?=D0=B0=20=D0=BF=D1=83=D1=81=D1=82=D0=BE=D0=B3=D0=BE=20=D1=87?=
 =?UTF-8?q?=D0=B0=D0=BD=D0=BA=D0=B0?=
MIME-Version: 1.0
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---
 protocol/src/main/java/mc/protocol/State.java |  1 +
 .../packets/server/ChunkDataPacket.java       | 70 +++++++++++++++++++
 .../main/java/mc/server/PacketHandler.java    |  6 ++
 3 files changed, 77 insertions(+)
 create mode 100644 protocol/src/main/java/mc/protocol/packets/server/ChunkDataPacket.java

diff --git a/protocol/src/main/java/mc/protocol/State.java b/protocol/src/main/java/mc/protocol/State.java
index 39d1dca..ea15576 100644
--- a/protocol/src/main/java/mc/protocol/State.java
+++ b/protocol/src/main/java/mc/protocol/State.java
@@ -53,6 +53,7 @@ public enum State {
 			Map.of(
 					JoinGamePacket.class, 0x23,
 					SpawnPositionPacket.class, 0x46,
+					ChunkDataPacket.class, 0x20,
 					PlayerAbilitiesPacket.class,0x2C,
 					SPlayerPositionAndLookPacket.class, 0x2F
 			)
diff --git a/protocol/src/main/java/mc/protocol/packets/server/ChunkDataPacket.java b/protocol/src/main/java/mc/protocol/packets/server/ChunkDataPacket.java
new file mode 100644
index 0000000..b298f38
--- /dev/null
+++ b/protocol/src/main/java/mc/protocol/packets/server/ChunkDataPacket.java
@@ -0,0 +1,70 @@
+package mc.protocol.packets.server;
+
+import io.netty.buffer.Unpooled;
+import lombok.Data;
+import mc.protocol.io.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Данные чанка.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD                    | TYPE         | NOTES                                                                              |
+ * |--------------------------|------------- |------------------------------------------------------------------------------------|
+ * | Chunk X                  | Integer      | Координаты чанка (координата блока, делённая на 16, округленная в меньшую сторону) |
+ * | Chunk Z                  | Integer      | Координаты чанка (координата блока, делённая на 16, округленная в меньшую сторону) |
+ * | Ground-Up Continuous     | Boolean      | См. Chunk Format                                                                   |
+ * | Primary Bit Mask         | VarInt       | Битовая маска, где каждый бит - это часть чанка (0-15)                             |
+ * | Size of Data             | VarInt       | Размер поля "Data"                                                                 |
+ * | Data                     | Byte array   | Данные чанка. См. Chunk Format                                                     |
+ * | Number of block entities | VarInt       | Количество элементов в поле "Block entities"                                       |
+ * | Block entities           | Array of NBT | Все сущности в чанке                                                               |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Chunk_Data">Chunk Data</a>
+ * @see <a href="https://wiki.vg/index.php?title=Chunk_Format&oldid=14135">Chunk Format</a>
+ */
+@Data
+public class ChunkDataPacket implements ServerSidePacket {
+
+	private int x;
+	private int z;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeInt(x);
+		netByteBuf.writeInt(z);
+		netByteBuf.writeBoolean(true); // Ground-Up Continuous
+		netByteBuf.writeVarInt(0b11111111); // Primary Bit Mask
+
+		NetByteBuf data = new NetByteBuf(Unpooled.buffer());
+		// <Data>
+		for (int i = 0; i < 16; i++) {
+			NetByteBuf dataBuff = new NetByteBuf(Unpooled.buffer(4096));
+			NetByteBuf blockLight = new NetByteBuf(Unpooled.buffer(2048));
+			NetByteBuf skyLight = new NetByteBuf(Unpooled.buffer(2048));
+			NetByteBuf biomes = new NetByteBuf(Unpooled.buffer(256));
+
+
+			// <Chunk Section>
+			data.writeUnsignedByte(13); // Bits Per Block
+			//   <Palette>
+			data.writeUnsignedByte(0); // Palette Length (for direct)
+			//     <Palette Data/>
+			//   </Palette>
+			data.writeVarInt(dataBuff.readableBytes()); // Data Array Length
+			data.writeBytes(dataBuff); // Data Array
+			data.writeBytes(blockLight); // Block Light
+			data.writeBytes(skyLight); // Sky Light
+			// </Chunk Section>
+			data.writeBytes(biomes); // Biomes
+		}
+		// </Data>
+
+		netByteBuf.writeVarInt(data.readableBytes()); // Size of Data
+		netByteBuf.writeBytes(data); // Data
+		netByteBuf.writeVarInt(0); // Number of block entities
+		/* write NBT's */
+	}
+}
diff --git a/server/src/main/java/mc/server/PacketHandler.java b/server/src/main/java/mc/server/PacketHandler.java
index ef7d8d0..641fd17 100644
--- a/server/src/main/java/mc/server/PacketHandler.java
+++ b/server/src/main/java/mc/server/PacketHandler.java
@@ -95,6 +95,12 @@ public class PacketHandler {
 
 		channel.getCtx().flush();
 
+		var chunkDataPacket = new ChunkDataPacket();
+		chunkDataPacket.setX(0);
+		chunkDataPacket.setZ(0);
+
+		channel.getCtx().writeAndFlush(chunkDataPacket);
+
 		var playerPositionAndLookPacket = new SPlayerPositionAndLookPacket();
 		playerPositionAndLookPacket.setPosition(spawnLocation);
 		playerPositionAndLookPacket.setLook(new Look(0f, 0f));