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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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patches/server/0519-Expand-PlayerRespawnEvent-fix-passed-parameter-issue.patch Normal file
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@ -0,0 +1,26 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: HexedHero <6012891+HexedHero@users.noreply.github.com>
Date: Fri, 23 Apr 2021 22:42:42 +0100
Subject: [PATCH] Expand PlayerRespawnEvent, fix passed parameter issues
Co-authored-by: Jake Potrebic <jake.m.potrebic@gmail.com>
diff --git a/src/main/java/net/minecraft/server/level/ServerPlayer.java b/src/main/java/net/minecraft/server/level/ServerPlayer.java
index fffd3ae6c4fc0b86057cd915bb4f0987f41a64d0..52a5274fb811870481a48bf0505769d7ac5df31f 100644
--- a/src/main/java/net/minecraft/server/level/ServerPlayer.java
+++ b/src/main/java/net/minecraft/server/level/ServerPlayer.java
@@ -1195,7 +1195,13 @@ public class ServerPlayer extends net.minecraft.world.entity.player.Player {
Player respawnPlayer = this.getBukkitEntity();
Location location = CraftLocation.toBukkit(dimensionTransition.pos(), dimensionTransition.newLevel().getWorld(), dimensionTransition.yRot(), dimensionTransition.xRot());
- PlayerRespawnEvent respawnEvent = new PlayerRespawnEvent(respawnPlayer, location, isBedSpawn, isAnchorSpawn, reason);
+ // Paper start - respawn flags
+ com.google.common.collect.ImmutableSet.Builder<org.bukkit.event.player.PlayerRespawnEvent.RespawnFlag> builder = com.google.common.collect.ImmutableSet.builder();
+ if (reason == org.bukkit.event.player.PlayerRespawnEvent.RespawnReason.END_PORTAL) {
+ builder.add(org.bukkit.event.player.PlayerRespawnEvent.RespawnFlag.END_PORTAL);
+ }
+ PlayerRespawnEvent respawnEvent = new PlayerRespawnEvent(respawnPlayer, location, isBedSpawn, isAnchorSpawn, reason, builder);
+ // Paper end - respawn flags
this.level().getCraftServer().getPluginManager().callEvent(respawnEvent);
// Spigot Start
if (this.connection.isDisconnected()) {