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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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61
patches/server/0677-Implement-getComputedBiome-API.patch Normal file
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@ -0,0 +1,61 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jason Penilla <11360596+jpenilla@users.noreply.github.com>
Date: Mon, 14 Mar 2022 22:46:05 -0700
Subject: [PATCH] Implement getComputedBiome API
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
index 5d137f8c42356359701e1bea7525f82c018b502c..f6dd8665b9f6e2a8ff396deba8a021e695bedf7e 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftRegionAccessor.java
@@ -77,6 +77,13 @@ public abstract class CraftRegionAccessor implements RegionAccessor {
return CraftBiome.minecraftHolderToBukkit(this.getHandle().getNoiseBiome(x >> 2, y >> 2, z >> 2));
}
+ // Paper start
+ @Override
+ public Biome getComputedBiome(int x, int y, int z) {
+ return CraftBiome.minecraftHolderToBukkit(this.getHandle().getBiome(new BlockPos(x, y, z)));
+ }
+ // Paper end
+
@Override
public void setBiome(Location location, Biome biome) {
this.setBiome(location.getBlockX(), location.getBlockY(), location.getBlockZ(), biome);
diff --git a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
index 068b3735b6c50a7a2053c7dc39856f728fb7218a..6d10396347b69d9243ab902ecc68ede93fa17b7d 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/CraftBlock.java
@@ -340,6 +340,13 @@ public class CraftBlock implements Block {
return this.getWorld().getBiome(this.getX(), this.getY(), this.getZ());
}
+ // Paper start
+ @Override
+ public Biome getComputedBiome() {
+ return this.getWorld().getComputedBiome(this.getX(), this.getY(), this.getZ());
+ }
+ // Paper end
+
@Override
public void setBiome(Biome bio) {
this.getWorld().setBiome(this.getX(), this.getY(), this.getZ(), bio);
diff --git a/src/main/java/org/bukkit/craftbukkit/generator/CraftLimitedRegion.java b/src/main/java/org/bukkit/craftbukkit/generator/CraftLimitedRegion.java
index 7d6ee60b1d3e023e1eabc59eb591c3ae3d8ac043..eaa9ba70b0b80d86eb376a0641420093a7c9dfdb 100644
--- a/src/main/java/org/bukkit/craftbukkit/generator/CraftLimitedRegion.java
+++ b/src/main/java/org/bukkit/craftbukkit/generator/CraftLimitedRegion.java
@@ -165,6 +165,14 @@ public class CraftLimitedRegion extends CraftRegionAccessor implements LimitedRe
return super.getBiome(x, y, z);
}
+ // Paper start
+ @Override
+ public Biome getComputedBiome(int x, int y, int z) {
+ Preconditions.checkArgument(this.isInRegion(x, y, z), "Coordinates %s, %s, %s are not in the region", x, y, z);
+ return super.getComputedBiome(x, y, z);
+ }
+ // Paper end
+
@Override
public void setBiome(int x, int y, int z, Holder<net.minecraft.world.level.biome.Biome> biomeBase) {
Preconditions.checkArgument(this.isInRegion(x, y, z), "Coordinates %s, %s, %s are not in the region", x, y, z);