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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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73
patches/server/0711-Add-missing-important-BlockStateListPopulator-method.patch Normal file
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@ -0,0 +1,73 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Sun, 12 Jun 2022 13:25:52 -0400
Subject: [PATCH] Add missing important BlockStateListPopulator methods
Without these methods it causes exceptions due to these being used by certain feature generators.
diff --git a/src/main/java/org/bukkit/craftbukkit/util/BlockStateListPopulator.java b/src/main/java/org/bukkit/craftbukkit/util/BlockStateListPopulator.java
index ffe6881d93153838cd23f125980b832e6fd1d0eb..f5cbe9ae5802fa48e57092b1e5ca8a5f5f69ee60 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/BlockStateListPopulator.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/BlockStateListPopulator.java
@@ -129,7 +129,7 @@ public class BlockStateListPopulator extends DummyGeneratorAccess {
@Override
public boolean isFluidAtPosition(BlockPos pos, Predicate<FluidState> state) {
- return this.world.isFluidAtPosition(pos, state);
+ return state.test(this.getFluidState(pos)); // Paper - fix
}
@Override
@@ -152,4 +152,33 @@ public class BlockStateListPopulator extends DummyGeneratorAccess {
public long nextSubTickCount() {
return this.world.nextSubTickCount();
}
+
+ // Paper start
+ @Override
+ public <T extends BlockEntity> java.util.Optional<T> getBlockEntity(BlockPos pos, net.minecraft.world.level.block.entity.BlockEntityType<T> type) {
+ BlockEntity tileentity = this.getBlockEntity(pos);
+
+ return tileentity != null && tileentity.getType() == type ? (java.util.Optional<T>) java.util.Optional.of(tileentity) : java.util.Optional.empty();
+ }
+
+ @Override
+ public BlockPos getHeightmapPos(net.minecraft.world.level.levelgen.Heightmap.Types heightmap, BlockPos pos) {
+ return world.getHeightmapPos(heightmap, pos);
+ }
+
+ @Override
+ public int getHeight(net.minecraft.world.level.levelgen.Heightmap.Types heightmap, int x, int z) {
+ return world.getHeight(heightmap, x, z);
+ }
+
+ @Override
+ public int getRawBrightness(BlockPos pos, int ambientDarkness) {
+ return world.getRawBrightness(pos, ambientDarkness);
+ }
+
+ @Override
+ public int getBrightness(net.minecraft.world.level.LightLayer type, BlockPos pos) {
+ return world.getBrightness(type, pos);
+ }
+ // Paper end
}
diff --git a/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java b/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java
index 4705aed1dd98378c146bf9e346df1a17f719ad36..daf3c26fce7569761951bfd5594c6726d854a9ff 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/DummyGeneratorAccess.java
@@ -258,4 +258,14 @@ public class DummyGeneratorAccess implements WorldGenLevel {
public boolean destroyBlock(BlockPos pos, boolean drop, Entity breakingEntity, int maxUpdateDepth) {
return false; // SPIGOT-6515
}
+
+ // Paper start - add more methods
+ public void scheduleTick(BlockPos pos, Fluid fluid, int delay) {}
+
+ @Override
+ public void scheduleTick(BlockPos pos, Block block, int delay, net.minecraft.world.ticks.TickPriority priority) {}
+
+ @Override
+ public void scheduleTick(BlockPos pos, Fluid fluid, int delay, net.minecraft.world.ticks.TickPriority priority) {}
+ // Paper end - add more methods
}