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c5a10665b8
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.
35 lines
2.4 KiB
Diff
35 lines
2.4 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Fri, 18 Mar 2022 21:30:00 -0700
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Subject: [PATCH] Fix async entity add due to fungus trees
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diff --git a/src/main/java/net/minecraft/server/level/WorldGenRegion.java b/src/main/java/net/minecraft/server/level/WorldGenRegion.java
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index 13229388ddce668061a34c787ab9586d41854d8a..682c8cfbd917c086072f1756861a340800ea40da 100644
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--- a/src/main/java/net/minecraft/server/level/WorldGenRegion.java
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+++ b/src/main/java/net/minecraft/server/level/WorldGenRegion.java
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@@ -237,6 +237,7 @@ public class WorldGenRegion implements WorldGenLevel {
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if (iblockdata.isAir()) {
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return false;
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} else {
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+ if (drop) LOGGER.warn("Potential async entity add during worldgen", new Throwable()); // Paper - Fix async entity add due to fungus trees; log when this happens
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if (false) { // CraftBukkit - SPIGOT-6833: Do not drop during world generation
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BlockEntity tileentity = iblockdata.hasBlockEntity() ? this.getBlockEntity(pos) : null;
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diff --git a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
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index 3c1937b43b6834ae0ffdd8d22ac32a776bc7fb64..a14d3e6c43b94c543790571b13808713444a239f 100644
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--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
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+++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
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@@ -261,10 +261,10 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
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((ChorusFlowerBlock) Blocks.CHORUS_FLOWER).generatePlant(access, pos, random, 8);
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return true;
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case CRIMSON_FUNGUS:
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- gen = TreeFeatures.CRIMSON_FUNGUS_PLANTED;
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+ gen = this.isNormalWorld() ? TreeFeatures.CRIMSON_FUNGUS_PLANTED : TreeFeatures.CRIMSON_FUNGUS; // Paper - Fix async entity add due to fungus trees; if world gen, don't use planted version
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break;
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case WARPED_FUNGUS:
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- gen = TreeFeatures.WARPED_FUNGUS_PLANTED;
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+ gen = this.isNormalWorld() ? TreeFeatures.WARPED_FUNGUS_PLANTED : TreeFeatures.WARPED_FUNGUS; // Paper - Fix async entity add due to fungus trees; if world gen, don't use planted version
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break;
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case AZALEA:
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gen = TreeFeatures.AZALEA_TREE;
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