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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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35
patches/server/0651-Add-configurable-height-for-slime-spawn.patch Normal file
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@ -0,0 +1,35 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Doc <nachito94@msn.com>
Date: Mon, 2 Aug 2021 11:24:39 -0400
Subject: [PATCH] Add configurable height for slime spawn
diff --git a/src/main/java/net/minecraft/world/entity/monster/Slime.java b/src/main/java/net/minecraft/world/entity/monster/Slime.java
index b54c30ba73b6ab069c0c7c1cd2b193090da79667..adebb66e550f805f444bec22e9a4dd575a642b43 100644
--- a/src/main/java/net/minecraft/world/entity/monster/Slime.java
+++ b/src/main/java/net/minecraft/world/entity/monster/Slime.java
@@ -348,7 +348,11 @@ public class Slime extends Mob implements Enemy {
return checkMobSpawnRules(type, world, spawnReason, pos, random);
}
- if (world.getBiome(pos).is(BiomeTags.ALLOWS_SURFACE_SLIME_SPAWNS) && pos.getY() > 50 && pos.getY() < 70 && random.nextFloat() < 0.5F && random.nextFloat() < world.getMoonBrightness() && world.getMaxLocalRawBrightness(pos) <= random.nextInt(8)) {
+ // Paper start - Replace rules for Height in Swamp Biome
+ final double maxHeightSwamp = world.getMinecraftWorld().paperConfig().entities.spawning.slimeSpawnHeight.surfaceBiome.maximum;
+ final double minHeightSwamp = world.getMinecraftWorld().paperConfig().entities.spawning.slimeSpawnHeight.surfaceBiome.minimum;
+ if (world.getBiome(pos).is(BiomeTags.ALLOWS_SURFACE_SLIME_SPAWNS) && pos.getY() > minHeightSwamp && pos.getY() < maxHeightSwamp && random.nextFloat() < 0.5F && random.nextFloat() < world.getMoonBrightness() && world.getMaxLocalRawBrightness(pos) <= random.nextInt(8)) {
+ // Paper end - Replace rules for Height in Swamp Biome
return checkMobSpawnRules(type, world, spawnReason, pos, random);
}
@@ -359,7 +363,10 @@ public class Slime extends Mob implements Enemy {
ChunkPos chunkcoordintpair = new ChunkPos(pos);
boolean flag = world.getMinecraftWorld().paperConfig().entities.spawning.allChunksAreSlimeChunks || WorldgenRandom.seedSlimeChunk(chunkcoordintpair.x, chunkcoordintpair.z, ((WorldGenLevel) world).getSeed(), world.getMinecraftWorld().spigotConfig.slimeSeed).nextInt(10) == 0; // Spigot // Paper
- if (random.nextInt(10) == 0 && flag && pos.getY() < 40) {
+ // Paper start - Replace rules for Height in Slime Chunks
+ final double maxHeightSlimeChunk = world.getMinecraftWorld().paperConfig().entities.spawning.slimeSpawnHeight.slimeChunk.maximum;
+ if (random.nextInt(10) == 0 && flag && pos.getY() < maxHeightSlimeChunk) {
+ // Paper end - Replace rules for Height in Slime Chunks
return checkMobSpawnRules(type, world, spawnReason, pos, random);
}
}