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c5a10665b8
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.
42 lines
2.5 KiB
Diff
42 lines
2.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: AJMFactsheets <AJMFactsheets@gmail.com>
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Date: Fri, 17 Jan 2020 17:17:54 -0600
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Subject: [PATCH] Fix items not falling correctly
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Since 1.14, Mojang has added an optimization which skips checking if
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an item should fall every fourth tick.
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However, Spigot's entity activation range class also has an
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optimization which skips ticking active entities every fourth tick.
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This can result in a state where an item will never properly fall
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due to its move method never being called.
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This patch resolves the conflict by offsetting checking Spigot's entity
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activation range check from an item's move method.
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diff --git a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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index f9dfd6e7b610cfee75524a525ab0e72bed5522da..e110296a95441a13ec431d897796326b0277edb1 100644
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--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
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@@ -175,7 +175,7 @@ public class ItemEntity extends Entity implements TraceableEntity {
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}
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}
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- if (!this.onGround() || this.getDeltaMovement().horizontalDistanceSqr() > 9.999999747378752E-6D || (this.tickCount + this.getId()) % 4 == 0) {
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+ if (!this.onGround() || this.getDeltaMovement().horizontalDistanceSqr() > 9.999999747378752E-6D || (this.tickCount + this.getId()) % 4 == 0) { // Paper - Diff on change
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this.move(MoverType.SELF, this.getDeltaMovement());
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float f = 0.98F;
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diff --git a/src/main/java/org/spigotmc/ActivationRange.java b/src/main/java/org/spigotmc/ActivationRange.java
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index 6d51464f6368151e8acc532414ee223714584e96..9fb9fa62c32445ac3c3883a6433759c86dcfc428 100644
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--- a/src/main/java/org/spigotmc/ActivationRange.java
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+++ b/src/main/java/org/spigotmc/ActivationRange.java
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@@ -256,7 +256,7 @@ public class ActivationRange
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isActive = true;
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}
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// Add a little performance juice to active entities. Skip 1/4 if not immune.
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- } else if ( !entity.defaultActivationState && entity.tickCount % 4 == 0 && !ActivationRange.checkEntityImmunities( entity ) )
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+ } else if ( !entity.defaultActivationState && (entity.tickCount + entity.getId()) % 4 == 0 && !ActivationRange.checkEntityImmunities( entity ) ) // Paper - Ensure checking item movement is offset from Spigot's entity activation range check
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{
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isActive = false;
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}
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