From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Samsuik <kfian294ma4@gmail.com>
Date: Tue, 20 Feb 2024 19:16:16 +0000
Subject: [PATCH] Add entity travel distance limits


diff --git a/src/main/java/net/minecraft/server/level/ServerLevel.java b/src/main/java/net/minecraft/server/level/ServerLevel.java
index 71f96f0716e6001ea74690d43160c08ca6a3024e..7f7aae5c2e14dba493e44778254a45f51fd32ce4 100644
--- a/src/main/java/net/minecraft/server/level/ServerLevel.java
+++ b/src/main/java/net/minecraft/server/level/ServerLevel.java
@@ -1143,6 +1143,11 @@ public class ServerLevel extends Level implements WorldGenLevel {
         if (isActive) { // Paper - EAR 2
             TimingHistory.activatedEntityTicks++;
         entity.tick();
+            // Sakura start - entity travel distance limits
+            if (entity.isPastTravelDistanceLimit()) {
+                entity.discard();
+            }
+            // Sakura end - entity travel distance limits
         entity.postTick(); // CraftBukkit
         } else { entity.inactiveTick(); } // Paper - EAR 2
         this.getProfiler().pop();
diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 80dfd159f8f71f9a6de38334d9ec5a50120ed324..6934dec885c91d44a6c81bd6df75c2f5420e1fc3 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -587,6 +587,19 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource {
         return false;
     }
     // Sakura end - Treat all collidable blocks as full when moving fast
+    // Sakura start - entity travel distance limits
+    private final double travelDistanceLimit;
+
+    public final boolean isPastTravelDistanceLimit() {
+        if (origin == null) {
+            return false;
+        }
+
+        double x = Math.pow(origin.getX() - position.x(), 2);
+        double z = Math.pow(origin.getZ() - position.z(), 2);
+        return Math.max(x, z) >= this.travelDistanceLimit;
+    }
+    // Sakura end - entity travel distance limits
 
     // Paper start
     /**
@@ -684,6 +697,7 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource {
         this.setPos(0.0D, 0.0D, 0.0D);
         this.eyeHeight = this.getEyeHeight(net.minecraft.world.entity.Pose.STANDING, this.dimensions);
         this.mergeLevel = this.level.sakuraConfig.mergeLevel; // Sakura
+        this.travelDistanceLimit = Math.pow(this.level.sakuraConfig.chunkTravelLimit.getOrDefault(type, Integer.MAX_VALUE) * 16.0, 2); // Sakura - entity travel distance limits
     }
 
     public boolean isColliding(BlockPos pos, BlockState state) {