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c5a10665b8
Spigot still maintains some partial implementation of "tick skipping", a practice in which the MinecraftServer.currentTick field is updated not by an increment of one per actual tick, but instead set to System.currentTimeMillis() / 50. This behaviour means that the tracked tick may "skip" a tick value in case a previous tick took more than the expected 50ms. To compensate for this in important paths, spigot/craftbukkit implements "wall-time". Instead of incrementing/decrementing ticks on block entities/entities by one for each call to their tick() method, they instead increment/decrement important values, like an ItemEntity's age or pickupDelay, by the difference of `currentTick - lastTick`, where `lastTick` is the value of `currentTick` during the last tick() call. These "fixes" however do not play nicely with minecraft's simulation distance as entities/block entities implementing the above behaviour would "catch up" their values when moving from a non-ticking chunk to a ticking one as their `lastTick` value remains stuck on the last tick in a ticking chunk and hence lead to a large "catch up" once ticked again. Paper completely removes the "tick skipping" behaviour (See patch "Further-improve-server-tick-loop"), making the above precautions completely unnecessary, which also rids paper of the previous described incompatibility with non-ticking chunks.
24 lines
1.6 KiB
Diff
24 lines
1.6 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Shane Freeder <theboyetronic@gmail.com>
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Date: Wed, 13 Apr 2022 08:25:42 +0100
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Subject: [PATCH] Prevent tile entity copies loading chunks
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diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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index 76c9feb5e1389eb929571de74ececd4a4f384453..7c1a94980cf49d37be442e1b62de36d4395bcf2a 100644
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--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
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@@ -3200,7 +3200,12 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
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BlockPos blockposition = BlockEntity.getPosFromTag(customdata.getUnsafe());
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if (this.player.level().isLoaded(blockposition)) {
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- BlockEntity tileentity = this.player.level().getBlockEntity(blockposition);
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+ // Paper start - Prevent tile entity copies loading chunks
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+ BlockEntity tileentity = null;
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+ if (this.player.distanceToSqr(blockposition.getX(), blockposition.getY(), blockposition.getZ()) < 32 * 32 && this.player.serverLevel().isLoadedAndInBounds(blockposition)) {
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+ tileentity = this.player.level().getBlockEntity(blockposition);
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+ }
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+ // Paper end - Prevent tile entity copies loading chunks
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if (tileentity != null) {
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tileentity.saveToItem(itemstack, this.player.level().registryAccess());
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