From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Encode42 <me@encode42.dev>
Date: Tue, 12 Jul 2022 14:16:10 -0400
Subject: [PATCH] Add toggle for RNG manipulation

Paper patches RNG maniplulation by using a shared (and locked) random source.
This comes with a performance gain, but technical players may prefer the ability to manipulate RNG.

diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 57376b7c0d281a7950a69348b5aa869e89719232..376acce7e0fd5dedfdf10fa94ced41bc473b7815 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -599,7 +599,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource, S
         this.bb = Entity.INITIAL_AABB;
         this.stuckSpeedMultiplier = Vec3.ZERO;
         this.nextStep = 1.0F;
-        this.random = SHARED_RANDOM; // Paper
+        this.random = world == null || world.purpurConfig.entitySharedRandom ? SHARED_RANDOM : RandomSource.create(); // Paper // Purpur
         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 88c238e492b1081d1a64a3b6f05d7baa17e5d8c9..dd7f2beabf0edad4143ac2365ac04a22edf1f75e 100644
--- a/src/main/java/net/minecraft/world/entity/animal/Squid.java
+++ b/src/main/java/net/minecraft/world/entity/animal/Squid.java
@@ -44,7 +44,7 @@ public class Squid extends WaterAnimal {
 
     public Squid(EntityType<? extends Squid> type, Level world) {
         super(type, world);
-        //this.random.setSeed((long)this.getId()); // Paper - we set the random to shared, do not clobber the seed
+        if (!world.purpurConfig.entitySharedRandom) this.random.setSeed((long) this.getId()); // Paper - we set the random to shared, do not clobber the seed // Purpur
         this.tentacleSpeed = 1.0F / (this.random.nextFloat() + 1.0F) * 0.2F;
     }
 
diff --git a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
index 453d4b1c1d6b9a1521ce7a2e179dfcec0bf52a3c..c4174f1f3e6993a38cdb3cbd57553af9807a327b 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -204,9 +204,11 @@ public class PurpurWorldConfig {
 
     public int entityLifeSpan = 0;
     public float entityLeftHandedChance = 0.05f;
+    public boolean entitySharedRandom = true;
     private void entitySettings() {
         entityLifeSpan = getInt("gameplay-mechanics.entity-lifespan", entityLifeSpan);
         entityLeftHandedChance = (float) getDouble("gameplay-mechanics.entity-left-handed-chance", entityLeftHandedChance);
+        entitySharedRandom = getBoolean("settings.entity.shared-random", entitySharedRandom);
     }
 
     public boolean infinityWorksWithoutArrows = false;