mirror of
https://github.com/PaperMC/Paper.git
synced 2024-11-25 12:05:53 +01:00
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
|
|
From: Jake Potrebic <jake.m.potrebic@gmail.com>
|
|
Date: Sun, 10 Jul 2022 14:13:22 -0700
|
|
Subject: [PATCH] Don't use level random in entity constructors
|
|
|
|
Paper makes the entity random thread-safe
|
|
and constructing an entity off the main thread
|
|
should be supported. Some entities (for whatever
|
|
reason) use the level's random in some places.
|
|
|
|
diff --git a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
|
|
index df90d5b934f41f5d8c232e93830d6690b6ccf401..446c319524183d6a1b4d0e6f0613a8db690677da 100644
|
|
--- a/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
|
|
+++ b/src/main/java/net/minecraft/world/entity/item/ItemEntity.java
|
|
@@ -72,7 +72,12 @@ public class ItemEntity extends Entity implements TraceableEntity {
|
|
}
|
|
|
|
public ItemEntity(Level world, double x, double y, double z, ItemStack stack) {
|
|
- this(world, x, y, z, stack, world.random.nextDouble() * 0.2D - 0.1D, 0.2D, world.random.nextDouble() * 0.2D - 0.1D);
|
|
+ // Paper start - Don't use level random in entity constructors (to make them thread-safe)
|
|
+ this(EntityType.ITEM, world);
|
|
+ this.setPos(x, y, z);
|
|
+ this.setDeltaMovement(this.random.nextDouble() * 0.2D - 0.1D, 0.2D, this.random.nextDouble() * 0.2D - 0.1D);
|
|
+ this.setItem(stack);
|
|
+ // Paper end - Don't use level random in entity constructors
|
|
}
|
|
|
|
public ItemEntity(Level world, double x, double y, double z, ItemStack stack, double velocityX, double velocityY, double velocityZ) {
|
|
diff --git a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
|
|
index 47f2a480f6a4b15e55cedbfa8a58459d33516a97..42bd2d9a1528b6210e4dfb56233062fd97c9743b 100644
|
|
--- a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
|
|
+++ b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
|
|
@@ -62,7 +62,7 @@ public class PrimedTnt extends Entity implements TraceableEntity {
|
|
public PrimedTnt(Level world, double x, double y, double z, @Nullable LivingEntity igniter) {
|
|
this(EntityType.TNT, world);
|
|
this.setPos(x, y, z);
|
|
- double d3 = world.random.nextDouble() * 6.2831854820251465D;
|
|
+ double d3 = this.random.nextDouble() * 6.2831854820251465D; // Paper - Don't use level random in entity constructors
|
|
|
|
this.setDeltaMovement(-Math.sin(d3) * 0.02D, 0.20000000298023224D, -Math.cos(d3) * 0.02D);
|
|
this.setFuse(80);
|