From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Martijn Muijsers <martijnmuijsers@live.nl>
Date: Sun, 25 Dec 2022 19:39:38 +0100
Subject: [PATCH] Don't load chunks to activate climbing entities

License: AGPL-3.0 (https://www.gnu.org/licenses/agpl-3.0.html)
Gale - https://galemc.org

diff --git a/src/main/java/net/minecraft/world/entity/Entity.java b/src/main/java/net/minecraft/world/entity/Entity.java
index 0ed0635ef581705d07934b9b17a63a4c7e19f6e1..650a0f0ada672d050c1d1d52b33fe74dfa1ef5ed 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -4314,6 +4314,16 @@ public abstract class Entity implements Nameable, EntityAccess, CommandSource {
         return this.feetBlockState;
     }
 
+    // Gale start - don't load chunks to activate climbing entities
+    public @Nullable BlockState getFeetBlockStateIfLoaded() {
+        if (this.feetBlockState == null) {
+            this.feetBlockState = this.level.getBlockStateIfLoaded(this.blockPosition());
+        }
+
+        return this.feetBlockState;
+    }
+    // Gale end - don't load chunks to activate climbing entities
+
     public ChunkPos chunkPosition() {
         return this.chunkPosition;
     }
diff --git a/src/main/java/net/minecraft/world/entity/LivingEntity.java b/src/main/java/net/minecraft/world/entity/LivingEntity.java
index 0cc1008b3db93487c8e0801895264683f6d2e439..87499e82e80a8b7d6d8ca6eeaa1819b74fcf1665 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -1948,19 +1948,43 @@ public abstract class LivingEntity extends Entity {
 
     public boolean onClimbableCached() {
         if (!this.blockPosition().equals(this.lastClimbingPosition)) {
-            this.cachedOnClimbable = this.onClimbable();
-            this.lastClimbingPosition = this.blockPosition();
+            // Gale start - don't load chunks to activate climbing entities
+            Boolean onClimbableIfLoaded = this.onClimbable(this.level.galeConfig().smallOptimizations.loadChunks.toActivateClimbingEntities);
+            if (onClimbableIfLoaded != null) {
+                this.cachedOnClimbable = onClimbableIfLoaded;
+                this.lastClimbingPosition = this.blockPosition();
+            } else {
+                this.cachedOnClimbable = false;
+                this.lastClimbingPosition = null;
+            }
+            // Gale end - don't load chunks to activate climbing entities
         }
         return this.cachedOnClimbable;
     }
     // Gale end - Airplane - cache on climbable check
 
     public boolean onClimbable() {
+        // Gale start - don't load chunks to activate climbing entities
+        return onClimbable(true);
+    }
+
+    public Boolean onClimbable(boolean loadChunk) {
+        // Gale end - don't load chunks to activate climbing entities
         if (this.isSpectator()) {
             return false;
         } else {
             BlockPos blockposition = this.blockPosition();
-            BlockState iblockdata = this.getFeetBlockState();
+            // Gale start - don't load chunks to activate climbing entities
+            BlockState iblockdata;
+            if (loadChunk) {
+                iblockdata = this.getFeetBlockState();
+            } else {
+                iblockdata = this.getFeetBlockStateIfLoaded();
+                if (iblockdata == null) {
+                    return null;
+                }
+            }
+            // Gale end - don't load chunks to activate climbing entities
 
             if (iblockdata.is(BlockTags.CLIMBABLE)) {
                 this.lastClimbablePos = Optional.of(blockposition);
diff --git a/src/main/java/org/galemc/gale/configuration/GaleWorldConfiguration.java b/src/main/java/org/galemc/gale/configuration/GaleWorldConfiguration.java
index 75e0128d1f4f5b112f9908373b2e32941c68888e..f611c38cb628569fbf3257e006f410d6f0a25d39 100644
--- a/src/main/java/org/galemc/gale/configuration/GaleWorldConfiguration.java
+++ b/src/main/java/org/galemc/gale/configuration/GaleWorldConfiguration.java
@@ -287,6 +287,18 @@ public class GaleWorldConfiguration extends ConfigurationPart {
             public boolean toSpawnPhantoms = false;
             // Gale end - MultiPaper - don't load chunks to spawn phantoms
 
+            // Gale start - don't load chunks to activate climbing entities
+            /**
+             * Whether to load chunks to check whether entities are on a climbable block. If false,
+             * entities in unloaded chunks will be assumed to not be on a climbable block.
+             * <ul>
+             *     <li><i>Default</i>: false</li>
+             *     <li><i>Vanilla</i>: true</li>
+             * </ul>
+             */
+            public boolean toActivateClimbingEntities = false;
+            // Gale end - don't load chunks to activate climbing entities
+
         }
 
     }