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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.
23 lines
1.4 KiB
Diff
23 lines
1.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Chase Henderson <henderson.chase@gmail.com>
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Date: Fri, 5 Jan 2024 03:50:10 -0500
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Subject: [PATCH] Add ShulkerDuplicateEvent
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diff --git a/src/main/java/net/minecraft/world/entity/monster/Shulker.java b/src/main/java/net/minecraft/world/entity/monster/Shulker.java
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index bf58956379d0a5dbfdc34e8626847638b4111433..920c7a92643e83598f39bf984cca430d9deed2cd 100644
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--- a/src/main/java/net/minecraft/world/entity/monster/Shulker.java
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+++ b/src/main/java/net/minecraft/world/entity/monster/Shulker.java
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@@ -491,6 +491,11 @@ public class Shulker extends AbstractGolem implements VariantHolder<Optional<Dye
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if (entityshulker != null) {
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entityshulker.setVariant(this.getVariant());
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entityshulker.moveTo(vec3d);
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+ // Paper start - Shulker duplicate event
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+ if (!new io.papermc.paper.event.entity.ShulkerDuplicateEvent((org.bukkit.entity.Shulker) entityshulker.getBukkitEntity(), (org.bukkit.entity.Shulker) this.getBukkitEntity()).callEvent()) {
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+ return;
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+ }
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+ // Paper end - Shulker duplicate event
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this.level().addFreshEntity(entityshulker, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.BREEDING); // CraftBukkit - the mysteries of life
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}
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