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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Tue, 22 Mar 2016 00:33:47 -0400
Subject: [PATCH] Use a Shared Random for Entities
Reduces memory usage and provides ensures more randomness, Especially since a lot of garbage entity objects get created.
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 82e57978b79b5275b98a1fa7731c6a23ee861a2f..bd17157631a74f80e3b5ce50bb1f681abe1dd6a7 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -175,6 +175,79 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
return tag.contains("Bukkit.updateLevel") && tag.getInt("Bukkit.updateLevel") >= level;
}
+ // Paper start - Share random for entities to make them more random
+ public static RandomSource SHARED_RANDOM = new RandomRandomSource();
+ private static final class RandomRandomSource extends java.util.Random implements net.minecraft.world.level.levelgen.BitRandomSource {
+ private boolean locked = false;
+
+ @Override
+ public synchronized void setSeed(long seed) {
+ if (locked) {
+ LOGGER.error("Ignoring setSeed on Entity.SHARED_RANDOM", new Throwable());
+ } else {
+ super.setSeed(seed);
+ locked = true;
+ }
+ }
+
+ @Override
+ public RandomSource fork() {
+ return new net.minecraft.world.level.levelgen.LegacyRandomSource(this.nextLong());
+ }
+
+ @Override
+ public net.minecraft.world.level.levelgen.PositionalRandomFactory forkPositional() {
+ return new net.minecraft.world.level.levelgen.LegacyRandomSource.LegacyPositionalRandomFactory(this.nextLong());
+ }
+
+ // these below are added to fix reobf issues that I don't wanna deal with right now
+ @Override
+ public int next(int bits) {
+ return super.next(bits);
+ }
+
+ @Override
+ public int nextInt(int origin, int bound) {
+ return net.minecraft.world.level.levelgen.BitRandomSource.super.nextInt(origin, bound);
+ }
+
+ @Override
+ public long nextLong() {
+ return net.minecraft.world.level.levelgen.BitRandomSource.super.nextLong();
+ }
+
+ @Override
+ public int nextInt() {
+ return net.minecraft.world.level.levelgen.BitRandomSource.super.nextInt();
+ }
+
+ @Override
+ public int nextInt(int bound) {
+ return net.minecraft.world.level.levelgen.BitRandomSource.super.nextInt(bound);
+ }
+
+ @Override
+ public boolean nextBoolean() {
+ return net.minecraft.world.level.levelgen.BitRandomSource.super.nextBoolean();
+ }
+
+ @Override
+ public float nextFloat() {
+ return net.minecraft.world.level.levelgen.BitRandomSource.super.nextFloat();
+ }
+
+ @Override
+ public double nextDouble() {
+ return net.minecraft.world.level.levelgen.BitRandomSource.super.nextDouble();
+ }
+
+ @Override
+ public double nextGaussian() {
+ return super.nextGaussian();
+ }
+ }
+ // Paper end - Share random for entities to make them more random
+
private CraftEntity bukkitEntity;
public CraftEntity getBukkitEntity() {
@@ -370,7 +443,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
this.bb = Entity.INITIAL_AABB;
this.stuckSpeedMultiplier = Vec3.ZERO;
this.nextStep = 1.0F;
- this.random = RandomSource.create();
+ this.random = SHARED_RANDOM; // Paper - Share random for entities to make them more random
this.remainingFireTicks = -this.getFireImmuneTicks();
this.fluidHeight = new Object2DoubleArrayMap(2);
this.fluidOnEyes = new HashSet();
diff --git a/src/main/java/net/minecraft/world/entity/animal/Squid.java b/src/main/java/net/minecraft/world/entity/animal/Squid.java
index 97d5bc9bab95c21afb3b95d2a7eb7df0b64698ed..42f4e544fe7fbc342f15eacb5e38d40849e3c419 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Squid.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Squid.java
@@ -41,7 +41,7 @@ public class Squid extends WaterAnimal {
public Squid(EntityType<? extends Squid> type, Level world) {
super(type, world);
- this.random.setSeed((long)this.getId());
+ //this.random.setSeed((long)this.getId()); // Paper - Share random for entities to make them more random
this.tentacleSpeed = 1.0F / (this.random.nextFloat() + 1.0F) * 0.2F;
}
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