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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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71
patches/server/0727-Add-and-fix-missing-BlockFadeEvents.patch Normal file
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@ -0,0 +1,71 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Owen1212055 <23108066+Owen1212055@users.noreply.github.com>
Date: Thu, 21 Jul 2022 12:07:54 -0400
Subject: [PATCH] Add and fix missing BlockFadeEvents
Beyond calling the BlockFadeEvent in more places, this patch also aims
to pass the proper replacement state to the event, specifically for
potentially waterlogged block states fading.
Co-authored-by: Lulu13022002 <41980282+Lulu13022002@users.noreply.github.com
diff --git a/src/main/java/net/minecraft/world/level/block/FrogspawnBlock.java b/src/main/java/net/minecraft/world/level/block/FrogspawnBlock.java
index 669234bca9fa50548447f77dc5f314df8d9dd7c9..f2d4264743b6070f36adb66d00a3de0a72b86846 100644
--- a/src/main/java/net/minecraft/world/level/block/FrogspawnBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/FrogspawnBlock.java
@@ -92,6 +92,11 @@ public class FrogspawnBlock extends Block {
}
private void hatchFrogspawn(ServerLevel world, BlockPos pos, RandomSource random) {
+ // Paper start - Call BlockFadeEvent
+ if (org.bukkit.craftbukkit.event.CraftEventFactory.callBlockFadeEvent(world, pos, Blocks.AIR.defaultBlockState()).isCancelled()) {
+ return;
+ }
+ // Paper end - Call BlockFadeEvent
this.destroyBlock(world, pos);
world.playSound(null, pos, SoundEvents.FROGSPAWN_HATCH, SoundSource.BLOCKS, 1.0F, 1.0F);
this.spawnTadpoles(world, pos, random);
diff --git a/src/main/java/net/minecraft/world/level/block/ScaffoldingBlock.java b/src/main/java/net/minecraft/world/level/block/ScaffoldingBlock.java
index 580c77eeaf88083f2aed2e46e6c57dc1fcf9564c..f4cccbc134b33758cd553a29b9f8e9967517500d 100644
--- a/src/main/java/net/minecraft/world/level/block/ScaffoldingBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/ScaffoldingBlock.java
@@ -103,7 +103,7 @@ public class ScaffoldingBlock extends Block implements SimpleWaterloggedBlock {
int i = ScaffoldingBlock.getDistance(world, pos);
BlockState iblockdata1 = (BlockState) ((BlockState) state.setValue(ScaffoldingBlock.DISTANCE, i)).setValue(ScaffoldingBlock.BOTTOM, this.isBottom(world, pos, i));
- if ((Integer) iblockdata1.getValue(ScaffoldingBlock.DISTANCE) == 7 && !org.bukkit.craftbukkit.event.CraftEventFactory.callBlockFadeEvent(world, pos, Blocks.AIR.defaultBlockState()).isCancelled()) { // CraftBukkit - BlockFadeEvent
+ if ((Integer) iblockdata1.getValue(ScaffoldingBlock.DISTANCE) == 7 && !org.bukkit.craftbukkit.event.CraftEventFactory.callBlockFadeEvent(world, pos, iblockdata1.getFluidState().createLegacyBlock()).isCancelled()) { // CraftBukkit - BlockFadeEvent // Paper - fix wrong block state
if ((Integer) state.getValue(ScaffoldingBlock.DISTANCE) == 7) {
FallingBlockEntity.fall(world, pos, iblockdata1);
} else {
diff --git a/src/main/java/net/minecraft/world/level/block/SnifferEggBlock.java b/src/main/java/net/minecraft/world/level/block/SnifferEggBlock.java
index 14a5cd54820243f4ca59857b0d67c1e86457d590..f53808e200bd83ab80954ec5c1e9c14250302be8 100644
--- a/src/main/java/net/minecraft/world/level/block/SnifferEggBlock.java
+++ b/src/main/java/net/minecraft/world/level/block/SnifferEggBlock.java
@@ -60,12 +60,26 @@ public class SnifferEggBlock extends Block {
return this.getHatchLevel(state) == 2;
}
+ // Paper start - Call BlockFadeEvent
+ private void rescheduleTick(ServerLevel world, BlockPos pos) {
+ int baseDelay = hatchBoost(world, pos) ? BOOSTED_HATCH_TIME_TICKS : REGULAR_HATCH_TIME_TICKS;
+ world.scheduleTick(pos, this, (baseDelay / 3) + world.random.nextInt(RANDOM_HATCH_OFFSET_TICKS));
+ // reschedule to avoid being stuck here and behave like the other calls (see #onPlace)
+ }
+ // Paper end - Call BlockFadeEvent
+
@Override
public void tick(BlockState state, ServerLevel world, BlockPos pos, RandomSource random) {
if (!this.isReadyToHatch(state)) {
world.playSound(null, pos, SoundEvents.SNIFFER_EGG_CRACK, SoundSource.BLOCKS, 0.7F, 0.9F + random.nextFloat() * 0.2F);
world.setBlock(pos, state.setValue(HATCH, Integer.valueOf(this.getHatchLevel(state) + 1)), 2);
} else {
+ // Paper start - Call BlockFadeEvent
+ if (org.bukkit.craftbukkit.event.CraftEventFactory.callBlockFadeEvent(world, pos, state.getFluidState().createLegacyBlock()).isCancelled()) {
+ this.rescheduleTick(world, pos);
+ return;
+ }
+ // Paper end - Call BlockFadeEvent
world.playSound(null, pos, SoundEvents.SNIFFER_EGG_HATCH, SoundSource.BLOCKS, 0.7F, 0.9F + random.nextFloat() * 0.2F);
world.destroyBlock(pos, false);
Sniffer sniffer = EntityType.SNIFFER.create(world);