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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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53
patches/server/0918-Add-PlayerShieldDisableEvent.patch Normal file
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@ -0,0 +1,53 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Cryptite <cryptite@gmail.com>
Date: Mon, 1 May 2023 16:22:43 -0500
Subject: [PATCH] Add PlayerShieldDisableEvent
Called whenever a players shield is disabled. This is mainly caused by
attacking players or monsters that carry axes.
The event, while similar to the PlayerItemCooldownEvent, offers other
behaviour and can hence not be implemented as a childtype of said event.
Specifically, cancelling the event prevents the game events from being
sent to the player.
Plugins listening to just the PlayerItemCooldownEvent may not want said
sideeffects, meaning the disable event cannot share a handlerlist with
the cooldown event
diff --git a/src/main/java/net/minecraft/world/entity/player/Player.java b/src/main/java/net/minecraft/world/entity/player/Player.java
index 454b29d8c9e42e328933aa578f49d28f1e77898a..d0b51d96d6795b5fa03bc195b90324680545b752 100644
--- a/src/main/java/net/minecraft/world/entity/player/Player.java
+++ b/src/main/java/net/minecraft/world/entity/player/Player.java
@@ -1005,7 +1005,7 @@ public abstract class Player extends LivingEntity {
protected void blockUsingShield(LivingEntity attacker) {
super.blockUsingShield(attacker);
if (attacker.canDisableShield()) {
- this.disableShield();
+ this.disableShield(attacker); // Paper - Add PlayerShieldDisableEvent
}
}
@@ -1498,8 +1498,21 @@ public abstract class Player extends LivingEntity {
this.attack(target);
}
+ @io.papermc.paper.annotation.DoNotUse @Deprecated // Paper - Add PlayerShieldDisableEvent
public void disableShield() {
- this.getCooldowns().addCooldown(Items.SHIELD, 100);
+ // Paper start - Add PlayerShieldDisableEvent
+ this.disableShield(null);
+ }
+ public void disableShield(@Nullable LivingEntity attacker) {
+ final org.bukkit.entity.Entity finalAttacker = attacker != null ? attacker.getBukkitEntity() : null;
+ if (finalAttacker != null) {
+ final io.papermc.paper.event.player.PlayerShieldDisableEvent shieldDisableEvent = new io.papermc.paper.event.player.PlayerShieldDisableEvent((org.bukkit.entity.Player) getBukkitEntity(), finalAttacker, 100);
+ if (!shieldDisableEvent.callEvent()) return;
+ this.getCooldowns().addCooldown(Items.SHIELD, shieldDisableEvent.getCooldown());
+ } else {
+ this.getCooldowns().addCooldown(Items.SHIELD, 100);
+ }
+ // Paper end - Add PlayerShieldDisableEvent
this.stopUsingItem();
this.level().broadcastEntityEvent(this, (byte) 30);
}