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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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29
patches/server/0526-Add-HiddenPotionEffect-API.patch Normal file
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@ -0,0 +1,29 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Tamion <70228790+notTamion@users.noreply.github.com>
Date: Sun, 5 Nov 2023 09:51:28 +0100
Subject: [PATCH] Add HiddenPotionEffect API
== AT ==
public net.minecraft.world.effect.MobEffectInstance hiddenEffect
diff --git a/src/main/java/org/bukkit/craftbukkit/potion/CraftPotionUtil.java b/src/main/java/org/bukkit/craftbukkit/potion/CraftPotionUtil.java
index 01af4db5d0f17ea2943e5c464d4122a358503bc1..cb11f0624e4e65aa06bfaaec90729ee536cd53a0 100644
--- a/src/main/java/org/bukkit/craftbukkit/potion/CraftPotionUtil.java
+++ b/src/main/java/org/bukkit/craftbukkit/potion/CraftPotionUtil.java
@@ -78,6 +78,7 @@ public class CraftPotionUtil {
public static MobEffectInstance fromBukkit(PotionEffect effect) {
Holder<MobEffect> type = CraftPotionEffectType.bukkitToMinecraftHolder(effect.getType());
+ // Paper - Note: do not copy over the hidden effect, as this method is only used for applying to entities which we do not want to convert over.
return new MobEffectInstance(type, effect.getDuration(), effect.getAmplifier(), effect.isAmbient(), effect.hasParticles(), effect.hasIcon()); // Paper
}
@@ -87,7 +88,7 @@ public class CraftPotionUtil {
int duration = effect.getDuration();
boolean ambient = effect.isAmbient();
boolean particles = effect.isVisible();
- return new PotionEffect(type, duration, amp, ambient, particles, effect.showIcon()); // Paper
+ return new PotionEffect(type, duration, amp, ambient, particles, effect.showIcon(), effect.hiddenEffect == null ? null : toBukkit(effect.hiddenEffect)); // Paper
}
public static boolean equals(Holder<MobEffect> mobEffect, PotionEffectType type) {