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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Suddenly <suddenly@suddenly.coffee>
Date: Tue, 1 Mar 2016 13:51:54 -0600
Subject: [PATCH] Add configurable entity despawn distances


diff --git a/src/main/java/net/minecraft/world/entity/Mob.java b/src/main/java/net/minecraft/world/entity/Mob.java
index 0593d828c911c94c9833bf12b9c294e5dac1f4e8..02c8c52930640114592148fd5509ad8fffee5435 100644
--- a/src/main/java/net/minecraft/world/entity/Mob.java
+++ b/src/main/java/net/minecraft/world/entity/Mob.java
@@ -863,20 +863,24 @@ public abstract class Mob extends LivingEntity implements EquipmentUser, Leashab
             Player entityhuman = this.level().getNearestPlayer(this, -1.0D);
 
             if (entityhuman != null) {
-                double d0 = entityhuman.distanceToSqr((Entity) this);
-                int i = this.getType().getCategory().getDespawnDistance();
-                int j = i * i;
-
-                if (d0 > (double) j && this.removeWhenFarAway(d0)) {
+                // Paper start - Configurable despawn distances
+                final io.papermc.paper.configuration.WorldConfiguration.Entities.Spawning.DespawnRangePair despawnRangePair = this.level().paperConfig().entities.spawning.despawnRanges.get(this.getType().getCategory());
+                final io.papermc.paper.configuration.type.DespawnRange.Shape shape = this.level().paperConfig().entities.spawning.despawnRangeShape;
+                final double dy = Math.abs(entityhuman.getY() - this.getY());
+                final double dySqr = Math.pow(dy, 2);
+                final double dxSqr = Math.pow(entityhuman.getX() - this.getX(), 2);
+                final double dzSqr = Math.pow(entityhuman.getZ() - this.getZ(), 2);
+                final double distanceSquared = dxSqr + dzSqr + dySqr;
+                // Despawn if hard/soft limit is exceeded
+                if (despawnRangePair.hard().shouldDespawn(shape, dxSqr, dySqr, dzSqr, dy) && this.removeWhenFarAway(distanceSquared)) {
                     this.discard(EntityRemoveEvent.Cause.DESPAWN); // CraftBukkit - add Bukkit remove cause
                 }
-
-                int k = this.getType().getCategory().getNoDespawnDistance();
-                int l = k * k;
-
-                if (this.noActionTime > 600 && this.random.nextInt(800) == 0 && d0 > (double) l && this.removeWhenFarAway(d0)) {
-                    this.discard(EntityRemoveEvent.Cause.DESPAWN); // CraftBukkit - add Bukkit remove cause
-                } else if (d0 < (double) l) {
+                if (despawnRangePair.soft().shouldDespawn(shape, dxSqr, dySqr, dzSqr, dy)) {
+                    if (this.noActionTime > 600 && this.random.nextInt(800) == 0 && this.removeWhenFarAway(distanceSquared)) {
+                        this.discard(EntityRemoveEvent.Cause.DESPAWN); // CraftBukkit - add Bukkit remove cause
+                    }
+                } else {
+                // Paper end - Configurable despawn distances
                     this.noActionTime = 0;
                 }
             }