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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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42
patches/server/0638-Entity-powdered-snow-API.patch Normal file
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@ -0,0 +1,42 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Sun, 24 Oct 2021 20:58:43 -0700
Subject: [PATCH] Entity powdered snow API
== AT ==
public net.minecraft.world.entity.monster.Skeleton inPowderSnowTime
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
index 6fab713531665298d3b03e7960a17ecb1471a6d7..4ed5647101bbace0005b1ebfb824e4aed48e43cb 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftEntity.java
@@ -1099,6 +1099,13 @@ public abstract class CraftEntity implements org.bukkit.entity.Entity {
}
// Paper end - raw entity serialization API
+ // Paper start - entity powdered snow API
+ @Override
+ public boolean isInPowderedSnow() {
+ return getHandle().isInPowderSnow || getHandle().wasInPowderSnow; // depending on the location in the entity "tick" either could be needed.
+ }
+ // Paper end - entity powdered snow API
+
// Paper start - missing entity api
@Override
public boolean isInvisible() { // Paper - moved up from LivingEntity
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftSkeleton.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftSkeleton.java
index a0ea54181de6c6685deef265cbe9f66aabbca42b..6f98da9be6aef35e3b5c940188b872459a383c8e 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftSkeleton.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftSkeleton.java
@@ -45,4 +45,11 @@ public class CraftSkeleton extends CraftAbstractSkeleton implements Skeleton {
public SkeletonType getSkeletonType() {
return SkeletonType.NORMAL;
}
+
+ // Paper start
+ @Override
+ public int inPowderedSnowTime() {
+ return getHandle().inPowderSnowTime;
+ }
+ // Paper end
}