Implemented 0x30-ClientboundLightUpdatePacket

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/packet/play/clientbound/ClientboundLightUpdatePacket.kt

@@ -0,0 +1,36 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/11
+ */
+
+
+package cn.rtast.libmc.protocol.packet.play.clientbound
+
+import cn.rtast.libmc.network.BytesBuffer
+import cn.rtast.libmc.packet.MinecraftPacket
+import cn.rtast.libmc.packet.PacketCodec
+import cn.rtast.libmc.primitives.readVarInt
+import cn.rtast.libmc.protocol.protocol.game.world.LightData
+
+public data class ClientboundLightUpdatePacket(
+    /**
+     * Chunk coordinate (block coordinate divided by 16, rounded down)
+     */
+    val chunkX: Int,
+    /**
+     * Chunk coordinate (block coordinate divided by 16, rounded down)
+     */
+    val chunkZ: Int,
+    val data: LightData,
+) : MinecraftPacket {
+    internal companion object Codec : PacketCodec<ClientboundLightUpdatePacket> {
+        override fun encode(buffer: BytesBuffer, value: ClientboundLightUpdatePacket) {}
+        override fun decode(buffer: BytesBuffer): ClientboundLightUpdatePacket {
+            val chunkX = buffer.readVarInt()
+            val chunkZ = buffer.readVarInt()
+            val data = LightData.decode(buffer)
+            return ClientboundLightUpdatePacket(chunkX, chunkZ, data)
+        }
+    }
+}

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/protocol/game/world/LightData.kt

@@ -0,0 +1,98 @@
+/*
+ * Copyright © 2026 RTAkland
+ * Author: RTAkland
+ * Date: 2026/9/11
+ */
+
+
+package cn.rtast.libmc.protocol.protocol.game.world
+
+import cn.rtast.libmc.network.BytesBuffer
+import cn.rtast.libmc.packet.PacketCodec
+import cn.rtast.libmc.primitives.*
+
+public data class LightData(
+    val skyLightMask: BitSet,
+    val blockLightMask: BitSet,
+    val emptySkyLightMask: BitSet,
+    val emptyBlockLightMask: BitSet,
+    val skyLightArrays: List<ByteArray>,  // fixed 2048
+    val blockLightArrays: List<ByteArray>,  // fixed 2048
+) {
+    internal companion object Codec : PacketCodec<LightData> {
+        private const val LIGHT_ARRAY_SIZE = 2048
+        override fun encode(buffer: BytesBuffer, value: LightData) {
+            buffer.writeBitSet(value.skyLightMask)
+            buffer.writeBitSet(value.blockLightMask)
+            buffer.writeBitSet(value.emptySkyLightMask)
+            buffer.writeBitSet(value.emptyBlockLightMask)
+            buffer.writeVarInt(value.skyLightArrays.size)
+            buffer.writePrefixed(value.skyLightArrays) { array ->
+                require(array.size == LIGHT_ARRAY_SIZE)
+                writeVarInt(array.size)
+                writeBytes(array)
+            }
+
+            buffer.writePrefixed(value.blockLightArrays) { array ->
+                require(array.size == LIGHT_ARRAY_SIZE)
+                writeVarInt(array.size)
+                writeBytes(array)
+            }
+        }
+
+        override fun decode(buffer: BytesBuffer): LightData {
+            val skyLightMask = buffer.readBitSet()
+            val blockLightMask = buffer.readBitSet()
+            val emptySkyLightMask = buffer.readBitSet()
+            val emptyBlockLightMask = buffer.readBitSet()
+            val skyLightArrays = buffer.readPrefixed {
+                val length = readVarInt()
+                require(length == LIGHT_ARRAY_SIZE)
+                readBytes(length)
+            }
+            val blockLightArrays = buffer.readPrefixed {
+                val length = readVarInt()
+                require(length == LIGHT_ARRAY_SIZE)
+                readBytes(length)
+            }
+            return LightData(
+                skyLightMask, blockLightMask, emptySkyLightMask,
+                emptyBlockLightMask, skyLightArrays, blockLightArrays
+            )
+        }
+    }
+
+    public fun hasSkyLight(sectionY: Int, minSectionY: Int): Boolean {
+        val bitIndex = sectionY - (minSectionY - 1)
+        return skyLightMask.getBit(bitIndex)
+    }
+
+
+    public fun hasBlockLight(sectionY: Int, minSectionY: Int): Boolean {
+        val bitIndex = sectionY - (minSectionY - 1)
+        return blockLightMask.getBit(bitIndex)
+    }
+
+    override fun equals(other: Any?): Boolean {
+        if (this === other) return true
+        if (other == null || this::class != other::class) return false
+        other as LightData
+        if (!skyLightMask.contentEquals(other.skyLightMask)) return false
+        if (!blockLightMask.contentEquals(other.blockLightMask)) return false
+        if (!emptySkyLightMask.contentEquals(other.emptySkyLightMask)) return false
+        if (!emptyBlockLightMask.contentEquals(other.emptyBlockLightMask)) return false
+        if (skyLightArrays != other.skyLightArrays) return false
+        if (blockLightArrays != other.blockLightArrays) return false
+        return true
+    }
+
+    override fun hashCode(): Int {
+        var result = skyLightMask.contentHashCode()
+        result = 31 * result + blockLightMask.contentHashCode()
+        result = 31 * result + emptySkyLightMask.contentHashCode()
+        result = 31 * result + emptyBlockLightMask.contentHashCode()
+        result = 31 * result + skyLightArrays.hashCode()
+        result = 31 * result + blockLightArrays.hashCode()
+        return result
+    }
+}

libmc-protocol/src/commonMain/kotlin/cn/rtast/libmc/protocol/registry/GamePacketsProtocolRegistry.kt

@@ -108,7 +108,7 @@ internal object GamePacketsProtocolRegistry {
 //            register(0x2D, ClientboundLevelChunkUpdateWithLightPacket)
             register(0x2E, ClientboundLevelEventPacket)
             register(0x2F, ClientboundLevelParticlePacket)
-//            register(0x30, ClientboundLightUpdatePacket)
+            register(0x30, ClientboundLightUpdatePacket)
             register(0x31, ClientboundLoginPlayPacket)
             register(0x32, ClientboundLowDiskSpaceWarningPacket)
             register(0x33, ClientboundMapItemDataPacket)

libmc-protocol/src/commonTest/kotlin/client/TestClient.kt

@@ -11,6 +11,7 @@ import cn.rtast.libmc.crypto.AuthenticationProvider
 import cn.rtast.libmc.protocol.client.createMinecraftClient
 import cn.rtast.libmc.protocol.packet.play.clientbound.ClientboundContainerSetSlotPacket
 import cn.rtast.libmc.protocol.packet.play.clientbound.ClientboundLevelParticlePacket
+import cn.rtast.libmc.protocol.packet.play.clientbound.ClientboundLightUpdatePacket
 import cn.rtast.libmc.protocol.packet.play.clientbound.ClientboundPlayerChatMessagePacket
 import cn.rtast.libmc.protocol.packet.play.clientbound.ClientboundStepTickPacket
 import cn.rtast.libmc.protocol.protocol.session.SessionEvent
@@ -101,9 +102,8 @@ class TestClient {
             println(it)
         }
         cli.onPacket<ClientboundPlayerChatMessagePacket> { chatTracker.onReceivePlayerChat(it.messageSignature) }
-        cli.onPacket<ClientboundContainerSetSlotPacket> { println(it) }
-        cli.onPacket<ClientboundLevelParticlePacket> { println(it) }
-//        cli.on { packet, direction -> println("$direction -> $packet") }
+        cli.onPacket<ClientboundLightUpdatePacket> { println(it) }
+        cli.on { packet, direction -> println("$direction -> $packet") }
         cli.connect()
 
 //        awaitCancellation()