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Paper/patches/removed/1.19.2-legacy-chunksystem/0355-Fix-Light-Command.patch
Spottedleaf 01a13871de
Rewrite chunk system (#8177) 
Patch documentation to come

Issues with the old system that are fixed now:
- World generation does not scale with cpu cores effectively.
- Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps.
- Unreliable prioritisation of chunk gen/load calls that block the main thread.
- Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved.
- Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal.
- Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles.

The above list is not complete. The patch documentation will complete it.

New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil.

Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft.

The old legacy chunk system patches have been moved to the removed folder in case we need them again.
2022-09-26 01:02:51 -07:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 7 May 2020 19:17:36 -0400
Subject: [PATCH] Fix Light Command
This lets you run /paper fixlight <chunkRadius> (max 5) to automatically
fix all light data in the chunks.
diff --git a/src/main/java/io/papermc/paper/command/PaperCommand.java b/src/main/java/io/papermc/paper/command/PaperCommand.java
index 395c43f6440c1e0e47919eef096ea8a8d552ccec..f44ab1d71210e84328661c0feb662989a5635b6d 100644
--- a/src/main/java/io/papermc/paper/command/PaperCommand.java
+++ b/src/main/java/io/papermc/paper/command/PaperCommand.java
@@ -2,6 +2,7 @@ package io.papermc.paper.command;
import io.papermc.paper.command.subcommands.ChunkDebugCommand;
import io.papermc.paper.command.subcommands.EntityCommand;
+import io.papermc.paper.command.subcommands.FixLightCommand;
import io.papermc.paper.command.subcommands.HeapDumpCommand;
import io.papermc.paper.command.subcommands.ReloadCommand;
import io.papermc.paper.command.subcommands.VersionCommand;
@@ -42,6 +43,7 @@ public final class PaperCommand extends Command {
commands.put(Set.of("reload"), new ReloadCommand());
commands.put(Set.of("version"), new VersionCommand());
commands.put(Set.of("debug", "chunkinfo"), new ChunkDebugCommand());
+ commands.put(Set.of("fixlight"), new FixLightCommand());
return commands.entrySet().stream()
.flatMap(entry -> entry.getKey().stream().map(s -> Map.entry(s, entry.getValue())))
diff --git a/src/main/java/io/papermc/paper/command/subcommands/FixLightCommand.java b/src/main/java/io/papermc/paper/command/subcommands/FixLightCommand.java
new file mode 100644
index 0000000000000000000000000000000000000000..190df802cb24aa360f6cf4d291e38b4b3fe4a2ac
--- /dev/null
+++ b/src/main/java/io/papermc/paper/command/subcommands/FixLightCommand.java
@@ -0,0 +1,121 @@
+package io.papermc.paper.command.subcommands;
+
+import io.papermc.paper.command.PaperSubcommand;
+import java.util.ArrayDeque;
+import java.util.Deque;
+import net.minecraft.server.MCUtil;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.server.level.ChunkHolder;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.server.level.ThreadedLevelLightEngine;
+import net.minecraft.world.level.ChunkPos;
+import net.minecraft.world.level.chunk.LevelChunk;
+import org.bukkit.command.CommandSender;
+import org.bukkit.craftbukkit.entity.CraftPlayer;
+import org.bukkit.entity.Player;
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+import org.checkerframework.framework.qual.DefaultQualifier;
+
+import static net.kyori.adventure.text.Component.text;
+import static net.kyori.adventure.text.format.NamedTextColor.GREEN;
+import static net.kyori.adventure.text.format.NamedTextColor.RED;
+
+@DefaultQualifier(NonNull.class)
+public final class FixLightCommand implements PaperSubcommand {
+ @Override
+ public boolean execute(final CommandSender sender, final String subCommand, final String[] args) {
+ this.doFixLight(sender, args);
+ return true;
+ }
+
+ private void doFixLight(final CommandSender sender, final String[] args) {
+ if (!(sender instanceof Player)) {
+ sender.sendMessage(text("Only players can use this command", RED));
+ return;
+ }
+ @Nullable Runnable post = null;
+ int radius = 2;
+ if (args.length > 0) {
+ try {
+ final int parsed = Integer.parseInt(args[0]);
+ if (parsed < 0) {
+ sender.sendMessage(text("Radius cannot be negative!", RED));
+ return;
+ }
+ final int maxRadius = 5;
+ radius = Math.min(maxRadius, parsed);
+ if (radius != parsed) {
+ post = () -> sender.sendMessage(text("Radius '" + parsed + "' was not in the required range [0, " + maxRadius + "], it was lowered to the maximum (" + maxRadius + " chunks).", RED));
+ }
+ } catch (final Exception e) {
+ sender.sendMessage(text("'" + args[0] + "' is not a valid number.", RED));
+ return;
+ }
+ }
+
+ CraftPlayer player = (CraftPlayer) sender;
+ ServerPlayer handle = player.getHandle();
+ ServerLevel world = (ServerLevel) handle.level;
+ ThreadedLevelLightEngine lightengine = world.getChunkSource().getLightEngine();
+
+ net.minecraft.core.BlockPos center = MCUtil.toBlockPosition(player.getLocation());
+ Deque<ChunkPos> queue = new ArrayDeque<>(MCUtil.getSpiralOutChunks(center, radius));
+ updateLight(sender, world, lightengine, queue, post);
+ }
+
+ private void updateLight(
+ final CommandSender sender,
+ final ServerLevel world,
+ final ThreadedLevelLightEngine lightengine,
+ final Deque<ChunkPos> queue,
+ final @Nullable Runnable done
+ ) {
+ @Nullable ChunkPos coord = queue.poll();
+ if (coord == null) {
+ sender.sendMessage(text("All Chunks Light updated", GREEN));
+ if (done != null) {
+ done.run();
+ }
+ return;
+ }
+ world.getChunkSource().getChunkAtAsynchronously(coord.x, coord.z, false, false).whenCompleteAsync((either, ex) -> {
+ if (ex != null) {
+ sender.sendMessage(text("Error loading chunk " + coord, RED));
+ updateLight(sender, world, lightengine, queue, done);
+ return;
+ }
+ @Nullable LevelChunk chunk = (net.minecraft.world.level.chunk.LevelChunk) either.left().orElse(null);
+ if (chunk == null) {
+ updateLight(sender, world, lightengine, queue, done);
+ return;
+ }
+ lightengine.setTaskPerBatch(world.paperConfig().misc.lightQueueSize + 16 * 256); // ensure full chunk can fit into queue
+ sender.sendMessage(text("Updating Light " + coord));
+ int cx = chunk.getPos().x << 4;
+ int cz = chunk.getPos().z << 4;
+ for (int y = 0; y < world.getHeight(); y++) {
+ for (int x = 0; x < 16; x++) {
+ for (int z = 0; z < 16; z++) {
+ net.minecraft.core.BlockPos pos = new net.minecraft.core.BlockPos(cx + x, y, cz + z);
+ lightengine.checkBlock(pos);
+ }
+ }
+ }
+ lightengine.tryScheduleUpdate();
+ @Nullable ChunkHolder visibleChunk = world.getChunkSource().chunkMap.getVisibleChunkIfPresent(chunk.coordinateKey);
+ if (visibleChunk != null) {
+ world.getChunkSource().chunkMap.addLightTask(visibleChunk, () -> {
+ MinecraftServer.getServer().processQueue.add(() -> {
+ visibleChunk.broadcast(new net.minecraft.network.protocol.game.ClientboundLightUpdatePacket(chunk.getPos(), lightengine, null, null, true), false);
+ updateLight(sender, world, lightengine, queue, done);
+ });
+ });
+ } else {
+ updateLight(sender, world, lightengine, queue, done);
+ }
+ lightengine.setTaskPerBatch(world.paperConfig().misc.lightQueueSize);
+ }, MinecraftServer.getServer());
+ }
+}
diff --git a/src/main/java/net/minecraft/server/level/ChunkMap.java b/src/main/java/net/minecraft/server/level/ChunkMap.java
index 4b24e4d947e96ea0720f8f6bc33470e07c00310d..d60173b03baee4a66da1109795bf6a19737b8bd0 100644
--- a/src/main/java/net/minecraft/server/level/ChunkMap.java
+++ b/src/main/java/net/minecraft/server/level/ChunkMap.java
@@ -141,6 +141,12 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
private final ChunkTaskPriorityQueueSorter queueSorter;
private final ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> worldgenMailbox;
public final ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> mainThreadMailbox;
+ // Paper start
+ final ProcessorHandle<ChunkTaskPriorityQueueSorter.Message<Runnable>> mailboxLight;
+ public void addLightTask(ChunkHolder playerchunk, Runnable run) {
+ this.mailboxLight.tell(ChunkTaskPriorityQueueSorter.message(playerchunk, run));
+ }
+ // Paper end
public final ChunkProgressListener progressListener;
private final ChunkStatusUpdateListener chunkStatusListener;
public final ChunkMap.ChunkDistanceManager distanceManager;
@@ -284,11 +290,12 @@ public class ChunkMap extends ChunkStorage implements ChunkHolder.PlayerProvider
this.progressListener = worldGenerationProgressListener;
this.chunkStatusListener = chunkStatusChangeListener;
- ProcessorMailbox<Runnable> threadedmailbox1 = ProcessorMailbox.create(executor, "light");
+ ProcessorMailbox<Runnable> lightthreaded; ProcessorMailbox<Runnable> threadedmailbox1 = lightthreaded = ProcessorMailbox.create(executor, "light"); // Paper
this.queueSorter = new ChunkTaskPriorityQueueSorter(ImmutableList.of(threadedmailbox, mailbox, threadedmailbox1), executor, Integer.MAX_VALUE);
this.worldgenMailbox = this.queueSorter.getProcessor(threadedmailbox, false);
this.mainThreadMailbox = this.queueSorter.getProcessor(mailbox, false);
+ this.mailboxLight = this.queueSorter.getProcessor(lightthreaded, false);// Paper
this.lightEngine = new ThreadedLevelLightEngine(chunkProvider, this, this.level.dimensionType().hasSkyLight(), threadedmailbox1, this.queueSorter.getProcessor(threadedmailbox1, false));
this.distanceManager = new ChunkMap.ChunkDistanceManager(executor, mainThreadExecutor);
this.overworldDataStorage = persistentStateManagerFactory;
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