From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: NONPLAYT <76615486+NONPLAYT@users.noreply.github.com>
Date: Sat, 13 Jan 2024 20:29:38 +0300
Subject: [PATCH] lithium: precompute shape arrays

Original code by CaffeineMC, licensed under LGPL v3
You can find the original code on https://github.com/CaffeineMC/lithium-fabric (Yarn mappings)

diff --git a/src/main/java/net/minecraft/core/Direction.java b/src/main/java/net/minecraft/core/Direction.java
index b805e57d5a67d77d226cd8154e970050e2e8ef4a..c72ea0514baadc8d5fde93ff573d91a9fe7cc04c 100644
--- a/src/main/java/net/minecraft/core/Direction.java
+++ b/src/main/java/net/minecraft/core/Direction.java
@@ -39,7 +39,7 @@ public enum Direction implements StringRepresentable {
     private final Direction.Axis axis;
     private final Direction.AxisDirection axisDirection;
     private final Vec3i normal;
-    private static final Direction[] VALUES = values();
+    public static final Direction[] VALUES = values(); // DivineMC
     private static final Direction[] BY_3D_DATA = Arrays.stream(VALUES).sorted(Comparator.comparingInt((direction) -> {
         return direction.data3d;
     })).toArray((i) -> {
diff --git a/src/main/java/net/minecraft/world/phys/shapes/CubePointRange.java b/src/main/java/net/minecraft/world/phys/shapes/CubePointRange.java
index a544db042c8d2ecec8d323770552c4f10ca758a6..fc6a8b1cf33427320a60e3f2d9894ed2f0177bf7 100644
--- a/src/main/java/net/minecraft/world/phys/shapes/CubePointRange.java
+++ b/src/main/java/net/minecraft/world/phys/shapes/CubePointRange.java
@@ -4,6 +4,7 @@ import it.unimi.dsi.fastutil.doubles.AbstractDoubleList;
 
 public class CubePointRange extends AbstractDoubleList {
     private final int parts;
+    private double scale; // DivineMC - lithium: precompute shape arrays
 
     CubePointRange(int sectionCount) {
         if (sectionCount <= 0) {
@@ -11,10 +12,11 @@ public class CubePointRange extends AbstractDoubleList {
         } else {
             this.parts = sectionCount;
         }
+        this.scale = 1.0D / sectionCount; // DivineMC - lithium: precompute shape arrays
     }
 
     public double getDouble(int i) {
-        return (double)i / (double)this.parts;
+        return i * this.scale; // DivineMC - lithium: precompute shape arrays
     }
 
     public int size() {
diff --git a/src/main/java/net/minecraft/world/phys/shapes/CubeVoxelShape.java b/src/main/java/net/minecraft/world/phys/shapes/CubeVoxelShape.java
index 110405e6e70d980d3e09f04d79562b32a7413071..ef6027b0d664d0dfdff80ed023c9f4790d4f0f5a 100644
--- a/src/main/java/net/minecraft/world/phys/shapes/CubeVoxelShape.java
+++ b/src/main/java/net/minecraft/world/phys/shapes/CubeVoxelShape.java
@@ -5,6 +5,8 @@ import net.minecraft.core.Direction;
 import net.minecraft.util.Mth;
 
 public final class CubeVoxelShape extends VoxelShape {
+    private DoubleList[] list; // DivineMC - lithium: precompute shape arrays
+
     protected CubeVoxelShape(DiscreteVoxelShape voxels) {
         super(voxels);
         this.initCache(); // Paper - optimise collisions
@@ -12,7 +14,15 @@ public final class CubeVoxelShape extends VoxelShape {
 
     @Override
     protected DoubleList getCoords(Direction.Axis axis) {
-        return new CubePointRange(this.shape.getSize(axis));
+        // DivineMC start - lithium: precompute shape arrays
+        if (this.list == null) {
+            this.list = new DoubleList[Direction.Axis.VALUES.length];
+            for (Direction.Axis existingAxis : Direction.Axis.VALUES) {
+                this.list[existingAxis.ordinal()] = new CubePointRange(this.shape.getSize(axis));
+            }
+        }
+        return this.list[axis.ordinal()];
+        // DivineMC end
     }
 
     @Override