From f31bdc80c4a037f804480ccab8cd3d990faff65f Mon Sep 17 00:00:00 2001
From: Zach Brown <zach.brown@destroystokyo.com>
Date: Thu, 28 May 2015 22:01:25 -0500
Subject: [PATCH] Force load chunks for specific entities that fly through


diff --git a/src/main/java/net/minecraft/server/EntityEnderPearl.java b/src/main/java/net/minecraft/server/EntityEnderPearl.java
index f4b5032..a7190fa 100644
--- a/src/main/java/net/minecraft/server/EntityEnderPearl.java
+++ b/src/main/java/net/minecraft/server/EntityEnderPearl.java
@@ -86,8 +86,20 @@ public class EntityEnderPearl extends EntityProjectile {
     }
 
     public void t_() {
-        EntityLiving entityliving = this.getShooter();
+        // PaperSpigot start - Force load chunks for specific entities that fly through
+        if (world.paperSpigotConfig.loadUnloadedEnderPearls) {
+            ChunkProviderServer chunkProvider = (ChunkProviderServer) world.chunkProvider;
+            boolean before = chunkProvider.forceChunkLoad;
+            chunkProvider.forceChunkLoad = true;
+            for (int cx = (int) locX >> 4; cx <= (int) (locX + motX) >> 4; ++cx) {
+                for (int cz = (int) locZ >> 4; cz <= (int) (locZ + motZ) >> 4; ++cz) {
+                    world.getChunkAt(cx, cz);
+                }
+            }
+            chunkProvider.forceChunkLoad = before;
+        }
 
+        EntityLiving entityliving = this.getShooter();
         if (entityliving != null && entityliving instanceof EntityHuman && !entityliving.isAlive()) {
             this.die();
         } else {
diff --git a/src/main/java/net/minecraft/server/EntityFallingBlock.java b/src/main/java/net/minecraft/server/EntityFallingBlock.java
index 44219cd..a0452ac 100644
--- a/src/main/java/net/minecraft/server/EntityFallingBlock.java
+++ b/src/main/java/net/minecraft/server/EntityFallingBlock.java
@@ -60,6 +60,21 @@ public class EntityFallingBlock extends Entity {
         if (block.getMaterial() == Material.AIR) {
             this.die();
         } else {
+            // PaperSpigot start - Force load chunks for specific entities that fly through
+            if (world.paperSpigotConfig.loadUnloadedFallingBlocks) {
+                ChunkProviderServer chunkProvider = (ChunkProviderServer) world.chunkProvider;
+                boolean before = chunkProvider.forceChunkLoad;
+                chunkProvider.forceChunkLoad = true;
+
+                for (int cx = (int) locX >> 4; cx <= (int) (locX + motX) >> 4; ++cx) {
+                    for (int cz = (int) locZ >> 4; cz <= (int) (locZ + motZ) >> 4; ++cz) {
+                        world.getChunkAt(cx, cz);
+                    }
+                }
+
+                chunkProvider.forceChunkLoad = before;
+            }
+            // PaperSpigot end
             this.lastX = this.locX;
             this.lastY = this.locY;
             this.lastZ = this.locZ;
diff --git a/src/main/java/net/minecraft/server/EntityTNTPrimed.java b/src/main/java/net/minecraft/server/EntityTNTPrimed.java
index 1daba4e..db33c98 100644
--- a/src/main/java/net/minecraft/server/EntityTNTPrimed.java
+++ b/src/main/java/net/minecraft/server/EntityTNTPrimed.java
@@ -50,6 +50,21 @@ public class EntityTNTPrimed extends Entity {
 
     public void t_() {
         if (world.spigotConfig.currentPrimedTnt++ > world.spigotConfig.maxTntTicksPerTick) { return; } // Spigot
+        // PaperSpigot start - Force load chunks for specific entities that fly through
+        if (world.paperSpigotConfig.loadUnloadedTNTEntities) {
+            ChunkProviderServer chunkProvider = (ChunkProviderServer) world.chunkProvider;
+            boolean before = chunkProvider.forceChunkLoad;
+            chunkProvider.forceChunkLoad = true;
+
+            for (int cx = (int) locX >> 4; cx <= (int) (locX + motX) >> 4; ++cx) {
+                for (int cz = (int) locZ >> 4; cz <= (int) (locZ + motZ) >> 4; ++cz) {
+                    world.getChunkAt(cx, cz);
+                }
+            }
+
+            chunkProvider.forceChunkLoad = before;
+        }
+        // PaperSpigot end
         this.lastX = this.locX;
         this.lastY = this.locY;
         this.lastZ = this.locZ;
@@ -97,7 +112,19 @@ public class EntityTNTPrimed extends Entity {
         server.getPluginManager().callEvent(event);
 
         if (!event.isCancelled()) {
-            this.world.createExplosion(this, this.locX, this.locY + (double) (this.length / 2.0F), this.locZ, event.getRadius(), event.getFire(), true);
+            // PaperSpigot start - Force load chunks for specific entities that fly through
+            if (world.paperSpigotConfig.loadUnloadedTNTEntities) {
+                ChunkProviderServer chunkProvider = (ChunkProviderServer) world.chunkProvider;
+                boolean before = chunkProvider.forceChunkLoad;
+                chunkProvider.forceChunkLoad = true;
+
+                this.world.createExplosion(this, this.locX, this.locY + (double) (this.length / 2.0F), this.locZ, event.getRadius(), event.getFire(), true);
+
+                chunkProvider.forceChunkLoad = before;
+            } else {
+                this.world.createExplosion(this, this.locX, this.locY + (double) (this.length / 2.0F), this.locZ, event.getRadius(), event.getFire(), true);
+            }
+            // PaperSpigot end
         }
         // CraftBukkit end
     }
diff --git a/src/main/java/net/minecraft/server/World.java b/src/main/java/net/minecraft/server/World.java
index f507134..aec39a8 100644
--- a/src/main/java/net/minecraft/server/World.java
+++ b/src/main/java/net/minecraft/server/World.java
@@ -1641,6 +1641,17 @@ public abstract class World implements IBlockAccess {
                 if (this.isChunkLoaded(k, i1, true)) {
                     entity.ad = true;
                     this.getChunkAt(k, i1).a(entity);
+                // PaperSpigot start - Force load chunks for specific entities that fly through
+                } else if ((entity instanceof EntityEnderPearl && entity.world.paperSpigotConfig.loadUnloadedEnderPearls) ||
+                        (entity instanceof EntityTNTPrimed && entity.world.paperSpigotConfig.loadUnloadedTNTEntities) ||
+                        (entity instanceof EntityFallingBlock && entity.world.paperSpigotConfig.loadUnloadedFallingBlocks)) {
+                    ChunkProviderServer chunkProvider = (ChunkProviderServer) this.chunkProvider;
+                    boolean before = chunkProvider.forceChunkLoad;
+                    chunkProvider.forceChunkLoad = true;
+                    entity.ad = true;
+                    this.getChunkAt(k, i1).a(entity);
+                    chunkProvider.forceChunkLoad = before;
+                // PaperSpigot end
                 } else {
                     entity.ad = false;
                 }
diff --git a/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java b/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
index 6de509c..e6ecaff 100644
--- a/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
+++ b/src/main/java/org/github/paperspigot/PaperSpigotWorldConfig.java
@@ -259,4 +259,14 @@ public class PaperSpigotWorldConfig
     {
         disableEndCredits = getBoolean( "game-mechanics.disable-end-credits", false );
     }
+
+    public boolean loadUnloadedEnderPearls;
+    public boolean loadUnloadedTNTEntities;
+    public boolean loadUnloadedFallingBlocks;
+    private void loadUnloaded()
+    {
+        loadUnloadedEnderPearls = getBoolean( "load-chunks.enderpearls", false );
+        loadUnloadedTNTEntities = getBoolean( "load-chunks.tnt-entities", false );
+        loadUnloadedFallingBlocks = getBoolean( "load-chunks.falling-blocks", false );
+    }
 }
diff --git a/src/main/java/org/spigotmc/ActivationRange.java b/src/main/java/org/spigotmc/ActivationRange.java
index 7ca1b24..dcab40c 100644
--- a/src/main/java/org/spigotmc/ActivationRange.java
+++ b/src/main/java/org/spigotmc/ActivationRange.java
@@ -13,6 +13,7 @@ import net.minecraft.server.EntityComplexPart;
 import net.minecraft.server.EntityCreature;
 import net.minecraft.server.EntityEnderCrystal;
 import net.minecraft.server.EntityEnderDragon;
+import net.minecraft.server.EntityEnderPearl; // PaperSpigot
 import net.minecraft.server.EntityFallingBlock;
 import net.minecraft.server.EntityFireball;
 import net.minecraft.server.EntityFireworks;
@@ -247,7 +248,10 @@ public class ActivationRange
     {
         SpigotTimings.checkIfActiveTimer.startTiming();
         // Never safe to skip fireworks or entities not yet added to chunk
-        if ( !entity.isAddedToChunk() || entity instanceof EntityFireworks ) {
+        // PaperSpigot - Changes for loading chunks for entities that fly through them
+        if ( !entity.isAddedToChunk() || entity instanceof EntityFireworks || entity instanceof EntityFallingBlock ||
+                ( entity instanceof EntityEnderPearl && entity.world.paperSpigotConfig.loadUnloadedEnderPearls ) ||
+                ( entity instanceof EntityTNTPrimed && entity.world.paperSpigotConfig.loadUnloadedTNTEntities ) ) {
             SpigotTimings.checkIfActiveTimer.stopTiming();
             return true;
         }
-- 
1.9.5.msysgit.1