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 fcb3c6230b299a60ec96f3b77b757cf342e0715a..5750384557c84b4bb25b2b10f78b8170ce562e69 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -558,7 +558,7 @@ 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 b9c8fe36c6a6256097ea69383bef678bbfb6c45b..8ec27ee82cd6f31bee722852c5fc6e7ca64a3a77 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 fb28dbdd5d6428e5860344f92fe700583187c1e8..e1bfad94970dd468bedf216e395e047407270d85 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurWorldConfig.java
@@ -208,9 +208,11 @@ 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<>();