Paper/CraftBukkit-Patches/0069-Nerf-Zombie-Lag-Issues.patch

From f0fcf1cdd831dea90719d24c8f8f48ea18c14863 Mon Sep 17 00:00:00 2001
From: Dylan Xaldin <Puremin0rez515@gmail.com>
Date: Sat, 14 Sep 2013 11:02:34 +1000
Subject: [PATCH] Nerf Zombie Lag Issues

Nerf the Zombie Lag issues in MC 1.6 - "Fixes" MC-17630

diff --git a/src/main/java/net/minecraft/server/PathfinderGoalMeleeAttack.java b/src/main/java/net/minecraft/server/PathfinderGoalMeleeAttack.java
index a07c6cf..ee4bc7e 100644
--- a/src/main/java/net/minecraft/server/PathfinderGoalMeleeAttack.java
+++ b/src/main/java/net/minecraft/server/PathfinderGoalMeleeAttack.java
@@ -63,19 +63,88 @@ public class PathfinderGoalMeleeAttack extends PathfinderGoal {
         this.b.getNavigation().h();
     }
 
+    // Spigot start
+    private double pathX;
+    private double pathY;
+    private double pathZ;
+    private boolean prevPathOK;
+    private int fullRangeSearchDelay;
+    // Spigot end
     public void e() {
         EntityLiving entityliving = this.b.getGoalTarget();
 
         this.b.getControllerLook().a(entityliving, 30.0F, 30.0F);
+        double goalDistanceSq = this.b.e( entityliving.locX, entityliving.boundingBox.b, entityliving.locZ ); // Spigot
         if ((this.e || this.b.getEntitySenses().canSee(entityliving)) && --this.h <= 0) {
-            this.h = 4 + this.b.aD().nextInt(7);
-            this.b.getNavigation().a((Entity) entityliving, this.d);
+            // Spigot start
+            double targetMovement = entityliving.e( pathX, pathY, pathZ );
+            // If this is true, then we are re-pathing
+            if ( ( this.h <= 0 && targetMovement >= 1.0D ) || ( this.h <= 0 && this.b.aD().nextInt( 200 ) == 0 ) ) /* EntityCreature random instance */
+
+            {
+                AttributeInstance rangeAttr = this.b.getAttributeInstance( GenericAttributes.b );
+                double origRange = rangeAttr.getValue();
+                if ( fullRangeSearchDelay > 0 )
+                {
+
+                    double dist = Math.sqrt( goalDistanceSq );
+                    if ( dist <= 8.0D )
+                    {
+                        dist = 8.0D;
+                    }
+                    if ( dist > origRange )
+                    {
+                        dist = origRange;
+                    }
+                    rangeAttr.setValue( dist );
+                }
+
+                prevPathOK = this.b.getNavigation().a( (Entity) entityliving, this.d );
+
+                if ( fullRangeSearchDelay > 0 )
+                {
+                    fullRangeSearchDelay--;
+                    if ( origRange > 40.0D )
+                    {
+                        origRange = 40.0D;
+                    }
+                    rangeAttr.setValue( origRange );
+                }
+
+                pathX = entityliving.locX;
+                pathY = entityliving.boundingBox.b;
+                pathZ = entityliving.locZ;
+                this.h = 4 + this.b.aD().nextInt( 7 ); /* EntityCreature random instance */
+
+                if ( goalDistanceSq > 256.0D )
+                {
+                    if ( goalDistanceSq > 1024.0D )
+                    {
+                        this.h += 8;
+                    } else
+                    {
+                        this.h += 16;
+                    }
+                } else if ( !prevPathOK )
+                {
+                    this.h += 24;
+                }
+
+                if ( !prevPathOK || goalDistanceSq <= 256.0D )
+                {
+                    if ( fullRangeSearchDelay <= 0 )
+                    {
+                        fullRangeSearchDelay = 4 + this.b.aD().nextInt( 4 ); /* EntityCreature random instance */
+                    }
+                }
+            }
         }
+        // Spigot end
 
         this.c = Math.max(this.c - 1, 0);
         double d0 = (double) (this.b.width * 2.0F * this.b.width * 2.0F + entityliving.width);
 
-        if (this.b.e(entityliving.locX, entityliving.boundingBox.b, entityliving.locZ) <= d0) {
+        if (goalDistanceSq <= d0) { // Spigot
             if (this.c <= 0) {
                 this.c = 20;
                 if (this.b.aZ() != null) {
-- 
1.8.1.2