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01a13871de
Patch documentation to come Issues with the old system that are fixed now: - World generation does not scale with cpu cores effectively. - Relies on the main thread for scheduling and maintaining chunk state, dropping chunk load/generate rates at lower tps. - Unreliable prioritisation of chunk gen/load calls that block the main thread. - Shutdown logic is utterly unreliable, as it has to wait for all chunks to unload - is it guaranteed that the chunk system is in a state on shutdown that it can reliably do this? Watchdog shutdown also typically failed due to thread checks, which is now resolved. - Saving of data is not unified (i.e can save chunk data without saving entity data, poses problems for desync if shutdown is really abnormal. - Entities are not loaded with chunks. This caused quite a bit of headache for Chunk#getEntities API, but now the new chunk system loads entities with chunks so that they are ready whenever the chunk loads in. Effectively brings the behavior back to 1.16 era, but still storing entities in their own separate regionfiles. The above list is not complete. The patch documentation will complete it. New chunk system hard relies on starlight and dataconverter, and most importantly the new concurrent utilities in ConcurrentUtil. Some of the old async chunk i/o interface (i.e the old file io thread reroutes _some_ calls to the new file io thread) is kept for plugin compat reasons. It will be removed in the next major version of minecraft. The old legacy chunk system patches have been moved to the removed folder in case we need them again.
64 lines
3.5 KiB
Diff
64 lines
3.5 KiB
Diff
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Jake Potrebic <jake.m.potrebic@gmail.com>
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Date: Sun, 10 Jul 2022 14:13:22 -0700
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Subject: [PATCH] Don't use level random in entity constructors
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Paper makes the entity random thread-safe
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and constructing an entity off the main thread
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should be supported. Some entities (for whatever
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reason) use the level's random in some places.
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diff --git a/src/main/java/net/minecraft/world/entity/animal/Bee.java b/src/main/java/net/minecraft/world/entity/animal/Bee.java
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index e5de2c1d11e5de88420caba35bf75c8bbd799db5..a9cdf9034ad269f7a71358443acc053288cfbe6d 100644
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--- a/src/main/java/net/minecraft/world/entity/animal/Bee.java
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+++ b/src/main/java/net/minecraft/world/entity/animal/Bee.java
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@@ -1028,7 +1028,7 @@ public class Bee extends Animal implements NeutralMob, FlyingAnimal {
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BeeGoToHiveGoal() {
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super();
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- this.travellingTicks = Bee.this.level.random.nextInt(10);
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+ this.travellingTicks = Bee.this./* level. */random.nextInt(10); // Paper - use entity random
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this.blacklistedTargets = Lists.newArrayList();
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this.setFlags(EnumSet.of(Goal.Flag.MOVE));
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}
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@@ -1145,7 +1145,7 @@ public class Bee extends Animal implements NeutralMob, FlyingAnimal {
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BeeGoToKnownFlowerGoal() {
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super();
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- this.travellingTicks = Bee.this.level.random.nextInt(10);
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+ this.travellingTicks = Bee.this./* level. */random.nextInt(10); // Paper - use entity random
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this.setFlags(EnumSet.of(Goal.Flag.MOVE));
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}
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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 4c78c04ed031ec2e04642ebe5d79527e848d95f6..fcc5444a1268931a0fd2df1e6bbbc17cfd5a61e0 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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@@ -64,7 +64,12 @@ public class ItemEntity extends Entity {
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}
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public ItemEntity(Level world, double x, double y, double z, ItemStack stack) {
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- this(world, x, y, z, stack, world.random.nextDouble() * 0.2D - 0.1D, 0.2D, world.random.nextDouble() * 0.2D - 0.1D);
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+ // Paper start - don't use world random in entity constructor
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+ this(EntityType.ITEM, world);
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+ this.setPos(x, y, z);
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+ this.setDeltaMovement(this.random.nextDouble() * 0.2D - 0.1D, 0.2D, this.random.nextDouble() * 0.2D - 0.1D);
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+ this.setItem(stack);
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+ // Paper end
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}
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public ItemEntity(Level world, double x, double y, double z, ItemStack stack, double velocityX, double velocityY, double velocityZ) {
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diff --git a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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index 8101f358975b35b5a2dafbade3d14a910e408fa2..e09271450cae84f6206a20d6622918fe37380d59 100644
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--- a/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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+++ b/src/main/java/net/minecraft/world/entity/item/PrimedTnt.java
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@@ -35,7 +35,7 @@ public class PrimedTnt extends Entity {
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public PrimedTnt(Level world, double x, double y, double z, @Nullable LivingEntity igniter) {
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this(EntityType.TNT, world);
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this.setPos(x, y, z);
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- double d3 = world.random.nextDouble() * 6.2831854820251465D;
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+ double d3 = this.random.nextDouble() * 6.2831854820251465D; // Paper - don't use world random in entity constructor
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this.setDeltaMovement(-Math.sin(d3) * 0.02D, 0.20000000298023224D, -Math.cos(d3) * 0.02D);
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this.setFuse(80);
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