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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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76
patches/server/0316-Entity-Jump-API.patch Normal file
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@ -0,0 +1,76 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <Blake.Galbreath@GMail.com>
Date: Sat, 8 Feb 2020 23:26:11 -0600
Subject: [PATCH] Entity Jump API
== AT ==
public net.minecraft.world.entity.LivingEntity jumping
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 8ee6d25c3860fe7f2e5039c74c736d82eefda237..4c32b26e29ca3db0a2f62052e14bcc3e4c1cdea5 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -3433,8 +3433,10 @@ public abstract class LivingEntity extends Entity implements Attackable {
} else if (this.isInLava() && (!this.onGround() || d3 > d4)) {
this.jumpInLiquid(FluidTags.LAVA);
} else if ((this.onGround() || flag && d3 <= d4) && this.noJumpDelay == 0) {
+ if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper - Entity Jump API
this.jumpFromGround();
this.noJumpDelay = 10;
+ } else { this.setJumping(false); } // Paper - Entity Jump API; setJumping(false) stops a potential loop
}
} else {
this.noJumpDelay = 0;
diff --git a/src/main/java/net/minecraft/world/entity/animal/Panda.java b/src/main/java/net/minecraft/world/entity/animal/Panda.java
index 228cfb77e12ed5979e422dc5dbb5e8dcf363b509..8df42121aa22ec9f95a1b8627b64b0ff71e36314 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Panda.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Panda.java
@@ -541,7 +541,9 @@ public class Panda extends Animal {
Panda entitypanda = (Panda) iterator.next();
if (!entitypanda.isBaby() && entitypanda.onGround() && !entitypanda.isInWater() && entitypanda.canPerformAction()) {
+ if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper - Entity Jump API
entitypanda.jumpFromGround();
+ } else { this.setJumping(false); } // Paper - Entity Jump API; setJumping(false) stops a potential loop
}
}
diff --git a/src/main/java/net/minecraft/world/entity/monster/Ravager.java b/src/main/java/net/minecraft/world/entity/monster/Ravager.java
index 4d91bc4b90a208fec789325dbcec8cc56d1a2a8b..aa4111eef22546f8aa630228c51ef5761c9b373b 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Ravager.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Ravager.java
@@ -160,7 +160,9 @@ public class Ravager extends Raider {
}
if (!flag && this.onGround()) {
+ if (new com.destroystokyo.paper.event.entity.EntityJumpEvent(getBukkitLivingEntity()).callEvent()) { // Paper - Entity Jump API
this.jumpFromGround();
+ } else { this.setJumping(false); } // Paper - Entity Jump API; setJumping(false) stops a potential loop
}
}
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
index 97e76c3701c5e58ff5c8cd0f243efd7998f1c93d..b6238c327e91a52b77135290762feb8b1085fc7e 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftLivingEntity.java
@@ -968,4 +968,20 @@ public class CraftLivingEntity extends CraftEntity implements LivingEntity {
return org.bukkit.craftbukkit.CraftEquipmentSlot.getHand(this.getHandle().getUsedItemHand());
}
// Paper end - active item API
+
+ // Paper start - entity jump API
+ @Override
+ public boolean isJumping() {
+ return getHandle().jumping;
+ }
+
+ @Override
+ public void setJumping(boolean jumping) {
+ getHandle().setJumping(jumping);
+ if (jumping && getHandle() instanceof Mob) {
+ // this is needed to actually make a mob jump
+ ((Mob) getHandle()).getJumpControl().jump();
+ }
+ }
+ // Paper end - entity jump API
}