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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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19
patches/server/0978-check-if-itemstack-is-stackable-first.patch Normal file
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@ -0,0 +1,19 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: granny <contact@granny.dev>
Date: Sat, 24 Feb 2024 19:33:01 -0800
Subject: [PATCH] check if itemstack is stackable first
diff --git a/src/main/java/net/minecraft/world/entity/player/Inventory.java b/src/main/java/net/minecraft/world/entity/player/Inventory.java
index a62e7354bf67a66bdf9cd7c8f5d2e8f6bcacc74f..6e66141dca61f777b354854b5d0bac2570b8bf3b 100644
--- a/src/main/java/net/minecraft/world/entity/player/Inventory.java
+++ b/src/main/java/net/minecraft/world/entity/player/Inventory.java
@@ -111,7 +111,7 @@ public class Inventory implements Container, Nameable {
}
private boolean hasRemainingSpaceForItem(ItemStack existingStack, ItemStack stack) {
- return !existingStack.isEmpty() && ItemStack.isSameItemSameComponents(existingStack, stack) && existingStack.isStackable() && existingStack.getCount() < this.getMaxStackSize(existingStack);
+ return !existingStack.isEmpty() && existingStack.isStackable() && existingStack.getCount() < this.getMaxStackSize(existingStack) && ItemStack.isSameItemSameComponents(existingStack, stack); // Paper - check if itemstack is stackable first
}
// CraftBukkit start - Watch method above! :D