From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Paul Sauve <paul@technove.co>
Date: Sun, 13 Dec 2020 17:52:35 -0600
Subject: [PATCH] Reduce projectile chunk loading

Airplane
Copyright (C) 2020 Technove LLC

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

diff --git a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
index 69f439851fe1ff07d827eaed274940a5783d5f6c..bfa2a1ad2bf8004d7545cd2175834fa00fcdb8bb 100644
--- a/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
+++ b/src/main/java/net/minecraft/world/entity/projectile/Projectile.java
@@ -42,6 +42,37 @@ public abstract class Projectile extends Entity {
         super(type, world);
     }
 
+    // Airplane start
+    private static int loadedThisTick = 0;
+    private static int loadedTick;
+
+    private int buffered = 0;
+    @Override
+    public void setPos(double x, double y, double z) {
+        int currentTick = net.minecraft.server.MinecraftServer.currentTick;
+        if (loadedTick != currentTick) {
+            loadedTick = currentTick;
+            loadedThisTick = 0;
+        }
+        int previousX = Mth.floor(this.getX()) >> 4, previousZ = Mth.floor(this.getX()) >> 4;
+        int newX = Mth.floor(z) >> 4, newZ = Mth.floor(z) >> 4;
+        if (previousX != newX || previousZ != newZ) {
+            boolean isLoaded = ((net.minecraft.server.level.ServerChunkCache) this.level.getChunkSource()).getChunkAtIfLoadedMainThreadNoCache(newX, newZ) != null;
+            if (!isLoaded) {
+                if (loadedThisTick > 10) { // Airplane 10 = max chunks to load from projectiles in a tick todo config
+                    if (++buffered > 20) { // Airplane 20 = max chunks  a single projectile loads overall todo config
+                        this.discard();
+                    }
+                    return;
+                }
+                loadedThisTick++;
+            }
+            buffered = 0;
+        }
+        super.setPos(x, y, z);
+    }
+    // Airplane start
+
     public void setOwner(@Nullable Entity entity) {
         if (entity != null) {
             this.ownerUUID = entity.getUUID();