From 1d6a99b50b4afee6aa7422a050c0656a46adfdce Mon Sep 17 00:00:00 2001
From: Andrew Steinborn <git@steinborn.me>
Date: Mon, 18 Jan 2021 20:45:25 -0500
Subject: [PATCH] Inline shift direction fields

Removes a layer of indirection for EnumDirection.getAdjacent(X|Y|Z)(), which is in the
critical section for much of the server, including the lighting engine.
---
 .../net/minecraft/core/Direction.java.patch   | 46 +++++++++++++++++++
 1 file changed, 46 insertions(+)
 create mode 100644 paper-server/patches/sources/net/minecraft/core/Direction.java.patch

diff --git a/paper-server/patches/sources/net/minecraft/core/Direction.java.patch b/paper-server/patches/sources/net/minecraft/core/Direction.java.patch
new file mode 100644
index 0000000000..a0a77c5f10
--- /dev/null
+++ b/paper-server/patches/sources/net/minecraft/core/Direction.java.patch
@@ -0,0 +1,46 @@
+--- a/net/minecraft/core/Direction.java
++++ b/net/minecraft/core/Direction.java
+@@ -57,6 +57,12 @@
+         .sorted(Comparator.comparingInt(direction -> direction.data2d))
+         .toArray(Direction[]::new);
+ 
++    // Paper start - Perf: Inline shift direction fields
++    private final int adjX;
++    private final int adjY;
++    private final int adjZ;
++    // Paper end - Perf: Inline shift direction fields
++
+     private Direction(
+         final int id,
+         final int idOpposite,
+@@ -74,6 +80,11 @@
+         this.axisDirection = direction;
+         this.normal = vector;
+         this.normalVec3 = Vec3.atLowerCornerOf(vector);
++        // Paper start - Perf: Inline shift direction fields
++        this.adjX = vector.getX();
++        this.adjY = vector.getY();
++        this.adjZ = vector.getZ();
++        // Paper end - Perf: Inline shift direction fields
+     }
+ 
+     public static Direction[] orderedByNearest(Entity entity) {
+@@ -247,15 +258,15 @@
+     }
+ 
+     public int getStepX() {
+-        return this.normal.getX();
++        return this.adjX; // Paper - Perf: Inline shift direction fields
+     }
+ 
+     public int getStepY() {
+-        return this.normal.getY();
++        return this.adjY; // Paper - Perf: Inline shift direction fields
+     }
+ 
+     public int getStepZ() {
+-        return this.normal.getZ();
++        return this.adjZ; // Paper - Perf: Inline shift direction fields
+     }
+ 
+     public Vector3f step() {