Paper/patches/server/0841-Remove-UpgradeData-neighbour-ticks-outside-of-range.patch
Spottedleaf 8c5b837e05 Rework async chunk api implementation
Firstly, the old methods all routed to the CompletableFuture method.
However, the CF method could not guarantee that if the caller
was off-main that the future would be "completed" on-main. Since
the callback methods used the CF one, this meant that the callback
methods did not guarantee that the callbacks were to be called on
the main thread.

Now, all methods route to getChunkAtAsync(x, z, gen, urgent, cb)
so that the methods with the callback are guaranteed to invoke
the callback on the main thread. The CF behavior remains unchanged;
it may still appear to complete on main if invoked off-main.

Secondly, remove the scheduleOnMain invocation in the async
chunk completion. This unnecessarily delays the callback
by 1 tick.

Thirdly, add getChunksAtAsync(minX, minZ, maxX, maxZ, ...) which
will load chunks within an area. This method is provided as a helper
as keeping all chunks loaded within an area can be complicated to
implement for plugins (due to the lacking ticket API), and is
already implemented internally anyways.

Fourthly, remove the ticket addition that occured with getChunkAt
and getChunkAtAsync. The ticket addition may delay the unloading
of the chunk unnecessarily. It also fixes a very rare timing bug
where the future/callback would be completed after the chunk
unloads.
2024-11-18 23:00:59 -08:00

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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Spottedleaf <Spottedleaf@users.noreply.github.com>
Date: Wed, 9 Aug 2023 14:00:40 -0700
Subject: [PATCH] Remove UpgradeData neighbour ticks outside of range
The lists are only supposed to contain ticks for the 1 radius
neighbours of the chunk.
diff --git a/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java b/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
index 5c7c8fb3c67047ddc1b92f03e889839b5a303ff4..ce3d79ebc7f933d0b34b3f8f71bbec872076847a 100644
--- a/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
+++ b/src/main/java/net/minecraft/world/level/chunk/UpgradeData.java
@@ -113,6 +113,25 @@ public class UpgradeData {
}
}
+ // Paper start - filter out relocated neighbour ticks
+ // The lists are only supposed to contain ticks for the 1 radius neighbours of the chunk
+ private static <T> void filterTickList(int chunkX, int chunkZ, List<SavedTick<T>> ticks) {
+ for (java.util.Iterator<SavedTick<T>> iterator = ticks.iterator(); iterator.hasNext();) {
+ SavedTick<T> tick = iterator.next();
+ BlockPos tickPos = tick.pos();
+ int tickCX = tickPos.getX() >> 4;
+ int tickCZ = tickPos.getZ() >> 4;
+
+ int dist = Math.max(Math.abs(chunkX - tickCX), Math.abs(chunkZ - tickCZ));
+
+ if (dist != 1) {
+ LOGGER.warn("Neighbour tick '" + tick + "' serialized in chunk (" + chunkX + "," + chunkZ + ") is too far (" + tickCX + "," + tickCZ + ")");
+ iterator.remove();
+ }
+ }
+ }
+ // Paper end - filter out relocated neighbour ticks
+
public void upgrade(LevelChunk chunk) {
this.upgradeInside(chunk);
@@ -120,6 +139,11 @@ public class UpgradeData {
upgradeSides(chunk, direction8);
}
+ // Paper start - filter out relocated neighbour ticks
+ filterTickList(chunk.locX, chunk.locZ, this.neighborBlockTicks);
+ filterTickList(chunk.locX, chunk.locZ, this.neighborFluidTicks);
+ // Paper end - filter out relocated neighbour ticks
+
Level level = chunk.getLevel();
this.neighborBlockTicks.forEach(tick -> {
Block block = tick.type() == Blocks.AIR ? level.getBlockState(tick.pos()).getBlock() : tick.type();