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Map BLOCK_CHANGED_ACK to BLOCK_UPDATE in 1.19 -> 1.18.2 #1250

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Map BLOCK_CHANGED_ACK to BLOCK_UPDATE in 1.19 -> 1.18.2 #1250

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2 changes: 2 additions & 0 deletions ...rc/main/java/com/viaversion/viabackwards/protocol/v1_19to1_18_2/Protocol1_19To1_18_2.java
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Expand Up @@ -27,6 +27,7 @@
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.rewriter.BlockItemPacketRewriter1_19;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.rewriter.CommandRewriter1_19;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.rewriter.EntityPacketRewriter1_19;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.storage.BlockAckStorage;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.storage.DimensionRegistryStorage;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.storage.EntityTracker1_19;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.storage.NonceStorage;
Expand Down Expand Up @@ -343,6 +344,7 @@ public void register() {

@Override
public void init(final UserConnection user) {
user.put(new BlockAckStorage());
user.put(new DimensionRegistryStorage());
addEntityTracker(user, new EntityTracker1_19(user));
}
Expand Down
93 changes: 86 additions & 7 deletions .../viaversion/viabackwards/protocol/v1_19to1_18_2/rewriter/BlockItemPacketRewriter1_19.java
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Expand Up @@ -21,10 +21,13 @@
import com.viaversion.viabackwards.api.rewriters.BackwardsItemRewriter;
import com.viaversion.viabackwards.api.rewriters.EnchantmentRewriter;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.Protocol1_19To1_18_2;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.storage.BlockAckStorage;
import com.viaversion.viabackwards.protocol.v1_19to1_18_2.storage.LastDeathPosition;
import com.viaversion.viaversion.api.connection.UserConnection;
import com.viaversion.viaversion.api.data.ParticleMappings;
import com.viaversion.viaversion.api.data.entity.EntityTracker;
import com.viaversion.viaversion.api.minecraft.BlockChangeRecord;
import com.viaversion.viaversion.api.minecraft.BlockPosition;
import com.viaversion.viaversion.api.minecraft.GlobalBlockPosition;
import com.viaversion.viaversion.api.minecraft.chunks.Chunk;
import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
Expand All @@ -36,6 +39,7 @@
import com.viaversion.viaversion.api.type.Types;
import com.viaversion.viaversion.api.type.types.chunk.ChunkType1_18;
import com.viaversion.viaversion.protocols.v1_16_4to1_17.packet.ServerboundPackets1_17;
import com.viaversion.viaversion.protocols.v1_17_1to1_18.packet.ClientboundPackets1_18;
import com.viaversion.viaversion.protocols.v1_18_2to1_19.packet.ClientboundPackets1_19;
import com.viaversion.viaversion.rewriter.RecipeRewriter;
import com.viaversion.viaversion.util.MathUtil;
Expand Down Expand Up @@ -84,14 +88,85 @@ public void register() {
}
});

protocol.registerClientbound(ClientboundPackets1_19.BLOCK_CHANGED_ACK, null, new PacketHandlers() {
protocol.registerClientbound(ClientboundPackets1_19.BLOCK_CHANGED_ACK, ClientboundPackets1_18.BLOCK_UPDATE, new PacketHandlers() {
@Override
public void register() {
read(Types.VAR_INT); // Sequence
handler(PacketWrapper::cancel); // This is fine:tm:
handler(wrapper -> {
final BlockAckStorage storage = wrapper.user().get(BlockAckStorage.class);
final BlockPosition pos = storage.pollPendingBlock();
if (pos == null) {
wrapper.cancel();
return;
}

final int minSectionY = protocol.getEntityRewriter().tracker(wrapper.user()).currentMinY() >> 4;
final int blockState = storage.getBlockStateAt(pos, minSectionY);
if (blockState < 0) {
wrapper.cancel();
return;
}

wrapper.write(Types.BLOCK_POSITION1_14, pos);
wrapper.write(Types.VAR_INT, blockState);
});
}
});

protocol.replaceClientbound(ClientboundPackets1_19.BLOCK_UPDATE, new PacketHandlers() {
@Override
public void register() {
handler(wrapper -> {
final BlockPosition pos = wrapper.passthrough(Types.BLOCK_POSITION1_14);
final int blockId = wrapper.read(Types.VAR_INT);
final int mappedId = protocol.getMappingData().getNewBlockStateId(blockId);
wrapper.write(Types.VAR_INT, mappedId);
final int minSectionY = protocol.getEntityRewriter().tracker(wrapper.user()).currentMinY() >> 4;
wrapper.user().get(BlockAckStorage.class).updateBlockState(pos.x(), pos.y(), pos.z(), minSectionY, mappedId);
});
}
});

protocol.replaceClientbound(ClientboundPackets1_19.SECTION_BLOCKS_UPDATE, new PacketHandlers() {
@Override
public void register() {
handler(wrapper -> {
final long sectionPos = wrapper.passthrough(Types.LONG);
wrapper.passthrough(Types.BOOLEAN); // Suppress light updates

final int sectionY = (int) ((sectionPos << 44) >> 44);
final int chunkZ = (int) ((sectionPos << 22) >> 42);
final int chunkX = (int) (sectionPos >> 42);

final int minSectionY = protocol.getEntityRewriter().tracker(wrapper.user()).currentMinY() >> 4;
final BlockAckStorage storage = wrapper.user().get(BlockAckStorage.class);
for (final BlockChangeRecord record : wrapper.passthrough(Types.VAR_LONG_BLOCK_CHANGE_ARRAY)) {
final int mappedId = protocol.getMappingData().getNewBlockStateId(record.getBlockId());
record.setBlockId(mappedId);
storage.updateBlockState(
(chunkX << 4) | record.getSectionX(),
record.getY(sectionY),
(chunkZ << 4) | record.getSectionZ(),
minSectionY,
mappedId
);
}
});
}
});

protocol.replaceClientbound(ClientboundPackets1_19.LEVEL_CHUNK_WITH_LIGHT, wrapper -> {
final Chunk chunk = protocol.getBlockRewriter().handleChunk1_18(wrapper);
protocol.getBlockRewriter().handleBlockEntities(chunk, wrapper.user());
wrapper.user().get(BlockAckStorage.class).cacheChunk(chunk.getX(), chunk.getZ(), chunk.getSections());
});

protocol.registerClientbound(ClientboundPackets1_19.FORGET_LEVEL_CHUNK, wrapper -> {
final int chunkX = wrapper.passthrough(Types.INT);
final int chunkZ = wrapper.passthrough(Types.INT);
wrapper.user().get(BlockAckStorage.class).forgetChunk(chunkX, chunkZ);
});

protocol.replaceClientbound(ClientboundPackets1_19.LEVEL_PARTICLES, new PacketHandlers() {
@Override
public void register() {
Expand Down Expand Up @@ -126,14 +201,18 @@ public void register() {
}
});

// The server does nothing but track the sequence, so we can just set it as 0
protocol.registerServerbound(ServerboundPackets1_17.PLAYER_ACTION, new PacketHandlers() {
@Override
public void register() {
map(Types.VAR_INT); // Action
map(Types.BLOCK_POSITION1_14); // Block position
map(Types.UNSIGNED_BYTE); // Direction
create(Types.VAR_INT, 0); // Sequence
handler(wrapper -> {
final int action = wrapper.passthrough(Types.VAR_INT);
final BlockPosition pos = wrapper.passthrough(Types.BLOCK_POSITION1_14);
wrapper.passthrough(Types.UNSIGNED_BYTE); // Direction
wrapper.write(Types.VAR_INT, 0); // Sequence
if (action < 3) {
wrapper.user().get(BlockAckStorage.class).addPendingBlock(pos);
}
});
}
});
protocol.registerServerbound(ServerboundPackets1_17.USE_ITEM_ON, new PacketHandlers() {
Expand Down
109 changes: 109 additions & 0 deletions ...main/java/com/viaversion/viabackwards/protocol/v1_19to1_18_2/storage/BlockAckStorage.java
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@@ -0,0 +1,109 @@
/*
* This file is part of ViaBackwards - https://github.com/ViaVersion/ViaBackwards
* Copyright (C) 2016-2026 ViaVersion and contributors
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package com.viaversion.viabackwards.protocol.v1_19to1_18_2.storage;

import com.viaversion.viaversion.api.connection.StorableObject;
import com.viaversion.viaversion.api.minecraft.BlockPosition;
import com.viaversion.viaversion.api.minecraft.chunks.ChunkSection;
import com.viaversion.viaversion.api.minecraft.chunks.DataPalette;
import com.viaversion.viaversion.api.minecraft.chunks.PaletteType;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.Map;
import java.util.Queue;
import org.checkerframework.checker.nullness.qual.Nullable;

public final class BlockAckStorage implements StorableObject {

private final Queue<BlockPosition> pendingBlocks = new LinkedList<>();
private final Map<Long, int[][]> cachedChunks = new HashMap<>();

public void addPendingBlock(final BlockPosition pos) {
pendingBlocks.add(pos);
if (pendingBlocks.size() > 100) {
pendingBlocks.poll();
}
}

public @Nullable BlockPosition pollPendingBlock() {
return pendingBlocks.poll();
}

public void cacheChunk(final int chunkX, final int chunkZ, final ChunkSection[] sections) {
final int[][] blockStates = new int[sections.length][];
for (int i = 0; i < sections.length; i++) {
final ChunkSection section = sections[i];
if (section == null) {
continue;
}
final DataPalette palette = section.palette(PaletteType.BLOCKS);
final int[] states = new int[4096];
for (int x = 0; x < 16; x++) {
for (int y = 0; y < 16; y++) {
for (int z = 0; z < 16; z++) {
states[x | (z << 4) | (y << 8)] = palette.idAt(x, y, z);
}
}
}
blockStates[i] = states;
}
cachedChunks.put(packChunk(chunkX, chunkZ), blockStates);
}

public void forgetChunk(final int chunkX, final int chunkZ) {
cachedChunks.remove(packChunk(chunkX, chunkZ));
}

public void updateBlockState(final int blockX, final int blockY, final int blockZ, final int minSectionY, final int state) {
final int[][] sections = cachedChunks.get(packChunk(blockX >> 4, blockZ >> 4));
if (sections == null) {
return;
}
final int sectionIdx = (blockY >> 4) - minSectionY;
if (sectionIdx < 0 || sectionIdx >= sections.length) {
return;
}
int[] section = sections[sectionIdx];
if (section == null) {
section = new int[4096];
sections[sectionIdx] = section;
}
section[(blockX & 15) | ((blockZ & 15) << 4) | ((blockY & 15) << 8)] = state;
}

public int getBlockStateAt(final BlockPosition pos, final int minSectionY) {
final int[][] sections = cachedChunks.get(packChunk(pos.x() >> 4, pos.z() >> 4));
if (sections == null) {
return -1;
}
final int sectionIdx = (pos.y() >> 4) - minSectionY;
if (sectionIdx < 0 || sectionIdx >= sections.length) {
return -1;
}
final int[] section = sections[sectionIdx];
if (section == null) {
return -1;
}
return section[(pos.x() & 15) | ((pos.z() & 15) << 4) | ((pos.y() & 15) << 8)];
}

private static long packChunk(final int x, final int z) {
return ((long) x << 32) | (z & 0xFFFFFFFFL);
}

}