From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: BillyGalbreath <blake.galbreath@gmail.com>
Date: Fri, 14 May 2021 13:42:17 -0500
Subject: [PATCH] Add Mob#lookAt API


diff --git a/src/main/java/net/minecraft/world/entity/EntityInsentient.java b/src/main/java/net/minecraft/world/entity/EntityInsentient.java
index 5c7fafeb7fab584eded30ebe415584132f4ab8af..6c024a5fdd290e5eb219e677e28718d663b72f25 100644
--- a/src/main/java/net/minecraft/world/entity/EntityInsentient.java
+++ b/src/main/java/net/minecraft/world/entity/EntityInsentient.java
@@ -852,14 +852,17 @@ public abstract class EntityInsentient extends EntityLiving {
 
     protected void mobTick() {}
 
+    public int getMaxHeadXRot() { return O(); } // Paper - OBFHELPER
     public int O() {
         return 40;
     }
 
+    public int getMaxHeadYRot() { return Q(); } // Paper - OBFHELPER
     public int Q() {
         return 75;
     }
 
+    public int getHeadRotSpeed() { return ep(); } // Paper - OBFHELPER
     public int ep() {
         return 10;
     }
diff --git a/src/main/java/net/minecraft/world/entity/ai/control/ControllerLook.java b/src/main/java/net/minecraft/world/entity/ai/control/ControllerLook.java
index 3ce9edde641c8b8eea75479615bcd2866ffd2198..dadbaa7f43b8678b09c649e19a6eac8ec8b47d9d 100644
--- a/src/main/java/net/minecraft/world/entity/ai/control/ControllerLook.java
+++ b/src/main/java/net/minecraft/world/entity/ai/control/ControllerLook.java
@@ -20,18 +20,28 @@ public class ControllerLook {
         this.a = entityinsentient;
     }
 
+    public void lookAt(Vec3D vec3d) { a(vec3d); } // Paper - OBFHELPER
     public void a(Vec3D vec3d) {
         this.a(vec3d.x, vec3d.y, vec3d.z);
     }
 
+    // Paper start
+    public void lookAt(Entity entity) {
+        this.lookAt(entity.locX(), getWantedY(entity), entity.locZ());
+    }
+    // Paper end
+
+    public void lookAt(Entity entity, float f, float f1) { a(entity, f, f1); } // Paper - OBFHELPER
     public void a(Entity entity, float f, float f1) {
         this.a(entity.locX(), b(entity), entity.locZ(), f, f1);
     }
 
+    public void lookAt(double d0, double d1, double d2) { a(d0, d1, d2); } // Paper - OBFHELPER
     public void a(double d0, double d1, double d2) {
         this.a(d0, d1, d2, (float) this.a.ep(), (float) this.a.O());
     }
 
+    public void lookAt(double d0, double d1, double d2, float f, float f1) { a(d0, d1, d2, f, f1); } // Paper - OBFHELPER
     public void a(double d0, double d1, double d2, float f, float f1) {
         this.e = d0;
         this.f = d1;
@@ -103,6 +113,7 @@ public class ControllerLook {
         return f + f4;
     }
 
+    public static double getWantedY(Entity entity) { return b(entity); } // Paper - OBFHELPER
     private static double b(Entity entity) {
         return entity instanceof EntityLiving ? entity.getHeadY() : (entity.getBoundingBox().minY + entity.getBoundingBox().maxY) / 2.0D;
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java b/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
index 06cbe63ef04e0de824ac0b9d545b6da1f53701b3..125be4ca56d38c6cba1d1f4e7587abda075ee491 100644
--- a/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
+++ b/src/main/java/org/bukkit/craftbukkit/entity/CraftMob.java
@@ -84,5 +84,53 @@ public abstract class CraftMob extends CraftLivingEntity implements Mob {
     public boolean isInDaylight() {
         return getHandle().isInDaylight();
     }
+
+    @Override
+    public void lookAt(@org.jetbrains.annotations.NotNull org.bukkit.Location location) {
+        com.google.common.base.Preconditions.checkNotNull(location, "location cannot be null");
+        com.google.common.base.Preconditions.checkArgument(location.getWorld().equals(getWorld()), "location in a different world");
+        getHandle().getControllerLook().lookAt(location.getX(), location.getY(), location.getZ());
+    }
+
+    @Override
+    public void lookAt(@org.jetbrains.annotations.NotNull org.bukkit.Location location, float headRotationSpeed, float maxHeadPitch) {
+        com.google.common.base.Preconditions.checkNotNull(location, "location cannot be null");
+        com.google.common.base.Preconditions.checkArgument(location.getWorld().equals(getWorld()), "location in a different world");
+        getHandle().getControllerLook().lookAt(location.getX(), location.getY(), location.getZ(), headRotationSpeed, maxHeadPitch);
+    }
+
+    @Override
+    public void lookAt(@org.jetbrains.annotations.NotNull org.bukkit.entity.Entity entity) {
+        com.google.common.base.Preconditions.checkNotNull(entity, "entity cannot be null");
+        com.google.common.base.Preconditions.checkArgument(entity.getWorld().equals(getWorld()), "entity in a different world");
+        getHandle().getControllerLook().lookAt(((CraftEntity) entity).getHandle());
+    }
+
+    @Override
+    public void lookAt(@org.jetbrains.annotations.NotNull org.bukkit.entity.Entity entity, float headRotationSpeed, float maxHeadPitch) {
+        com.google.common.base.Preconditions.checkNotNull(entity, "entity cannot be null");
+        com.google.common.base.Preconditions.checkArgument(entity.getWorld().equals(getWorld()), "entity in a different world");
+        getHandle().getControllerLook().lookAt(((CraftEntity) entity).getHandle(), headRotationSpeed, maxHeadPitch);
+    }
+
+    @Override
+    public void lookAt(double x, double y, double z) {
+        getHandle().getControllerLook().lookAt(x, y, z);
+    }
+
+    @Override
+    public void lookAt(double x, double y, double z, float headRotationSpeed, float maxHeadPitch) {
+        getHandle().getControllerLook().lookAt(x, y, z, headRotationSpeed, maxHeadPitch);
+    }
+
+    @Override
+    public int getHeadRotationSpeed() {
+        return getHandle().getHeadRotSpeed();
+    }
+
+    @Override
+    public int getMaxHeadPitch() {
+        return getHandle().getMaxHeadXRot();
+    }
     // Paper end
 }