Paper/Spigot-Server-Patches/0081-Do-not-load-chunks-for-Pathfinding.patch

From ccce787782826e77e8f33819ff36465866a59e67 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Thu, 31 Mar 2016 19:17:58 -0400
Subject: [PATCH] Do not load chunks for Pathfinding


diff --git a/src/main/java/net/minecraft/server/ChunkCache.java b/src/main/java/net/minecraft/server/ChunkCache.java
index ccbc1dde09..34e743716b 100644
--- a/src/main/java/net/minecraft/server/ChunkCache.java
+++ b/src/main/java/net/minecraft/server/ChunkCache.java
@@ -25,7 +25,7 @@ public class ChunkCache implements IWorldReader {
 
         for (k = this.a; k <= i; ++k) {
             for (l = this.b; l <= j; ++l) {
-                this.c[k - this.a][l - this.b] = world.getChunkAt(k, l, ChunkStatus.FULL, false);
+                this.c[k - this.a][l - this.b] = world.getChunkIfLoadedImmediately(k, l); // Paper
             }
         }
 
@@ -91,7 +91,7 @@ public class ChunkCache implements IWorldReader {
         int k = i - this.a;
         int l = j - this.b;
 
-        return k >= 0 && k < this.c.length && l >= 0 && l < this.c[k].length;
+        return k >= 0 && k < this.c.length && l >= 0 && l < this.c[k].length && this.c[k][l] != null; // Paper - We don't always load chunks
     }
 
     @Override
diff --git a/src/main/java/net/minecraft/server/NavigationAbstract.java b/src/main/java/net/minecraft/server/NavigationAbstract.java
index a9f17b0318..8b05b8acd8 100644
--- a/src/main/java/net/minecraft/server/NavigationAbstract.java
+++ b/src/main/java/net/minecraft/server/NavigationAbstract.java
@@ -22,7 +22,7 @@ public abstract class NavigationAbstract {
     protected long n;
     protected PathfinderAbstract o;
     private BlockPosition q;
-    private Pathfinder r;
+    private Pathfinder r; public Pathfinder getPathfinder() { return r; } // Paper - OBFHELPER
 
     public NavigationAbstract(EntityInsentient entityinsentient, World world) {
         this.g = Vec3D.a;
diff --git a/src/main/java/net/minecraft/server/Pathfinder.java b/src/main/java/net/minecraft/server/Pathfinder.java
index 359d9a11c0..262fa55850 100644
--- a/src/main/java/net/minecraft/server/Pathfinder.java
+++ b/src/main/java/net/minecraft/server/Pathfinder.java
@@ -12,7 +12,7 @@ public class Pathfinder {
     private final Set<PathPoint> b = Sets.newHashSet();
     private final PathPoint[] c = new PathPoint[32];
     private final int d;
-    private PathfinderAbstract e;
+    private PathfinderAbstract e; public PathfinderAbstract getPathfinder() { return this.e; }  // Paper - OBFHELPER
 
     public Pathfinder(PathfinderAbstract pathfinderabstract, int i) {
         this.e = pathfinderabstract;
diff --git a/src/main/java/net/minecraft/server/PathfinderNormal.java b/src/main/java/net/minecraft/server/PathfinderNormal.java
index 593f13af49..80fcb66e3e 100644
--- a/src/main/java/net/minecraft/server/PathfinderNormal.java
+++ b/src/main/java/net/minecraft/server/PathfinderNormal.java
@@ -355,7 +355,8 @@ public class PathfinderNormal extends PathfinderAbstract {
         PathType pathtype = this.b(iblockaccess, i, j, k);
 
         if (pathtype == PathType.OPEN && j >= 1) {
-            Block block = iblockaccess.getType(new BlockPosition(i, j - 1, k)).getBlock();
+            Block block = iblockaccess.getBlockIfLoaded(new BlockPosition(i, j - 1, k)); // Paper
+            if (block == null) return PathType.BLOCKED; // Paper
             PathType pathtype1 = this.b(iblockaccess, i, j - 1, k);
 
             pathtype = pathtype1 != PathType.WALKABLE && pathtype1 != PathType.OPEN && pathtype1 != PathType.WATER && pathtype1 != PathType.LAVA ? PathType.WALKABLE : PathType.OPEN;
@@ -385,9 +386,10 @@ public class PathfinderNormal extends PathfinderAbstract {
                 for (int l = -1; l <= 1; ++l) {
                     for (int i1 = -1; i1 <= 1; ++i1) {
                         if (l != 0 || i1 != 0) {
-                            Block block = iblockaccess.getType(blockposition_pooledblockposition.d(l + i, j, i1 + k)).getBlock();
+                            Block block = iblockaccess.getBlockIfLoaded(blockposition_pooledblockposition.d(l + i, j, i1 + k)); // Paper
 
-                            if (block == Blocks.CACTUS) {
+                            if (block == null) pathtype = PathType.BLOCKED; // Paper
+                            else if (block == Blocks.CACTUS) { // Paper
                                 pathtype = PathType.DANGER_CACTUS;
                             } else if (block == Blocks.FIRE) {
                                 pathtype = PathType.DANGER_FIRE;
@@ -421,7 +423,8 @@ public class PathfinderNormal extends PathfinderAbstract {
 
     protected PathType b(IBlockAccess iblockaccess, int i, int j, int k) {
         BlockPosition blockposition = new BlockPosition(i, j, k);
-        IBlockData iblockdata = iblockaccess.getType(blockposition);
+        IBlockData iblockdata = iblockaccess.getTypeIfLoaded(blockposition); // Paper
+        if (iblockdata == null) return PathType.BLOCKED; // Paper
         Block block = iblockdata.getBlock();
         Material material = iblockdata.getMaterial();
 
-- 
2.22.0