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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.
27 lines
1.7 KiB
Diff
27 lines
1.7 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Aikar <aikar@aikar.co>
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Date: Thu, 23 Apr 2020 01:36:39 -0400
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Subject: [PATCH] Don't fire BlockFade on worldgen threads
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diff --git a/src/main/java/net/minecraft/world/level/block/FireBlock.java b/src/main/java/net/minecraft/world/level/block/FireBlock.java
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index c1111bd8065b53cb140e4289cb72985f03e6f549..9db6df5f28be559a324ead2fcfbe189eac076e2e 100644
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--- a/src/main/java/net/minecraft/world/level/block/FireBlock.java
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+++ b/src/main/java/net/minecraft/world/level/block/FireBlock.java
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@@ -108,6 +108,7 @@ public class FireBlock extends BaseFireBlock {
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@Override
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protected BlockState updateShape(BlockState state, Direction direction, BlockState neighborState, LevelAccessor world, BlockPos pos, BlockPos neighborPos) {
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// CraftBukkit start
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+ if (!(world instanceof ServerLevel)) return this.canSurvive(state, world, pos) ? (BlockState) this.getStateWithAge(world, pos, (Integer) state.getValue(FireBlock.AGE)) : Blocks.AIR.defaultBlockState(); // Paper - don't fire events in world generation
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if (!this.canSurvive(state, world, pos)) {
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// Suppress during worldgen
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if (!(world instanceof Level)) {
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@@ -123,7 +124,7 @@ public class FireBlock extends BaseFireBlock {
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return blockState.getHandle();
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}
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}
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- return this.getStateWithAge(world, pos, (Integer) state.getValue(FireBlock.AGE));
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+ return this.getStateWithAge(world, pos, (Integer) state.getValue(FireBlock.AGE)); // Paper - don't fire events in world generation; diff on change, see "don't fire events in world generation"
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// CraftBukkit end
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}
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