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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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31
patches/server/0881-Allow-proper-checking-of-empty-item-stacks.patch Normal file
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@ -0,0 +1,31 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aeltumn <daniel@goossens.ch>
Date: Mon, 28 Aug 2023 13:44:09 +0200
Subject: [PATCH] Allow proper checking of empty item stacks
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
index 4d29c34e221b749b6972c7ed79ac1f86da999ed7..c5a09f086d35f84c0a30266f78e06e2dfb5603e6 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
@@ -40,12 +40,19 @@ public final class CraftItemStack extends ItemStack {
}
// Paper end - MC Utils
+ // Paper start - override isEmpty to use vanilla's impl
+ @Override
+ public boolean isEmpty() {
+ return handle == null || handle.isEmpty();
+ }
+ // Paper end - override isEmpty to use vanilla's impl
+
public static net.minecraft.world.item.ItemStack asNMSCopy(ItemStack original) {
if (original instanceof CraftItemStack) {
CraftItemStack stack = (CraftItemStack) original;
return stack.handle == null ? net.minecraft.world.item.ItemStack.EMPTY : stack.handle.copy();
}
- if (original == null || original.getType() == Material.AIR) {
+ if (original == null || original.isEmpty()) { // Paper - override isEmpty to use vanilla's impl; use isEmpty
return net.minecraft.world.item.ItemStack.EMPTY;
}