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: GPL-3.0 (https://www.gnu.org/licenses/gpl-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 ccb2722e8025b97d972cafac5258676cb4a29390..ffb0e9a5c24d7c95f1cc1fe495ac4d76c6362eb8 100644
--- a/src/main/java/net/minecraft/world/entity/Entity.java
+++ b/src/main/java/net/minecraft/world/entity/Entity.java
@@ -4519,6 +4519,16 @@ 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 2f252bbe2946ea3228933b4b8c91a4e46fe99705..a35891723fad4fe984566c41cdd728004f8f371e 100644
--- a/src/main/java/net/minecraft/world/entity/LivingEntity.java
+++ b/src/main/java/net/minecraft/world/entity/LivingEntity.java
@@ -1979,19 +1979,43 @@ public abstract class LivingEntity extends Entity implements Attackable {
 
     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 e20a48ef23e3eb186f6564102c9146de206282c3..589ba88b01f23ba9d0b2396e03b0885e88302ab5 100644
--- a/src/main/java/org/galemc/gale/configuration/GaleWorldConfiguration.java
+++ b/src/main/java/org/galemc/gale/configuration/GaleWorldConfiguration.java
@@ -283,6 +283,18 @@ 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
+
         }
 
     }