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Remove wall-time / unused skip tick protection (#11412)

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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.
This commit is contained in:
Bjarne Koll 2024-09-19 16:36:07 +02:00 • committed by GitHub
parent 5c82955733
commit c5a10665b8
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GPG key ID: B5690EEEBB952194
794 changed files with 402 additions and 282 deletions
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35
patches/server/0636-Forward-CraftEntity-in-teleport-command.patch Normal file
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@ -0,0 +1,35 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sat, 4 Dec 2021 17:04:47 -0800
Subject: [PATCH] Forward CraftEntity in teleport command
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 35c0591f9d981f1cf7da4d1dea108a8bb3e46c7a..9f40cc481ded9279319d92fe5a0a9278a3f5d9c2 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -3353,6 +3353,13 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
}
public void restoreFrom(Entity original) {
+ // Paper start - Forward CraftEntity in teleport command
+ CraftEntity bukkitEntity = original.bukkitEntity;
+ if (bukkitEntity != null) {
+ bukkitEntity.setHandle(this);
+ this.bukkitEntity = bukkitEntity;
+ }
+ // Paper end - Forward CraftEntity in teleport command
CompoundTag nbttagcompound = original.saveWithoutId(new CompoundTag());
nbttagcompound.remove("Dimension");
@@ -3439,8 +3446,8 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
entity2.restoreFrom(this);
this.removeAfterChangingDimensions();
// CraftBukkit start - Forward the CraftEntity to the new entity
- this.getBukkitEntity().setHandle(entity2);
- entity2.bukkitEntity = this.getBukkitEntity();
+ // this.getBukkitEntity().setHandle(entity2); // Paper - forward CraftEntity in teleport command; moved to Entity#restoreFrom
+ // entity2.bukkitEntity = this.getBukkitEntity();
// CraftBukkit end
}