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 313f3430af520613cebbf890ff8d7f70d30dd518..496551820d0357da9c5e89dd989d31b43fbfeb18 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -559,7 +559,7 @@ public abstract class Entity implements SyncedDataHolder, Nameable, EntityAccess
         this.bb = Entity.INITIAL_AABB;
         this.stuckSpeedMultiplier = Vec3.ZERO;
         this.nextStep = 1.0F;
-        this.random = SHARED_RANDOM; // Paper - Share random for entities to make them more random
+        this.random = world == null || world.purpurConfig.entitySharedRandom ? SHARED_RANDOM : RandomSource.create(); // Paper - Share random for entities to make them more random // 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 4874d51405ce43e570ffcbf8eba4bf4aef185e50..e6244d8c7745570099638d96fafa6b4971c4beb8 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()); // Paper - Share random for entities to make them more random
+        if (!world.purpurConfig.entitySharedRandom) this.random.setSeed((long)this.getId()); // Paper - Share random for entities to make them more random // 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 642ab24c1827a58ca32b1a90b89d63f3c35c6c21..cd7fe2bbbfaadda901a241268164800e5f112b12 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -206,9 +206,11 @@ 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 List<Item> itemImmuneToCactus = new ArrayList<>();