added WangHash for DtNodePool

CHANGELOG.md

@@ -8,6 +8,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Added
 - Added DtNodePool tests
+- Added WangHash() for DtNodePool
 - Added avg, min, max, sampling updated times in CrowdAgentProfilingTool
  
 ### Fixed

src/DotRecast.Core/RcHashCodes.cs

@@ -1,10 +1,26 @@
-namespace DotRecast.Core
+using System.Runtime.CompilerServices;
+
+namespace DotRecast.Core
 {
     public static class RcHashCodes
     {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static int CombineHashCodes(int h1, int h2)
         {
             return (((h1 << 5) + h1) ^ h2);
         }
+
+        // From Thomas Wang, https://gist.github.com/badboy/6267743
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static uint WangHash(uint a)
+        {
+            a = (~a) + (a << 18); // a = (a << 18) - a - 1;
+            a = a ^ (a >> 31);
+            a = a * 21; // a = (a + (a << 2)) + (a << 4);
+            a = a ^ (a >> 11);
+            a = a + (a << 6);
+            a = a ^ (a >> 22);
+            return (uint)a;
+        }
     }
 }

src/DotRecast.Detour/DtNodePool.cs

@@ -24,11 +24,13 @@ namespace DotRecast.Detour
 {
     public class DtNodePool
     {
-        private readonly Dictionary<long, List<DtNode>> m_map = new Dictionary<long, List<DtNode>>();
-        private readonly List<DtNode> m_nodes = new List<DtNode>();
+        private readonly Dictionary<long, List<DtNode>> m_map;
+        private readonly List<DtNode> m_nodes;
 
         public DtNodePool()
         {
+            m_map = new Dictionary<long, List<DtNode>>();
+            m_nodes = new List<DtNode>();
         }
 
         public void Clear()

test/DotRecast.Core.Test/RcHashCodesTest.cs

@@ -0,0 +1,40 @@
+using NUnit.Framework;
+
+namespace DotRecast.Core.Test;
+
+public class RcHashCodesTest
+{
+    [Test]
+    public void TestCombineHashCodes()
+    {
+        Assert.That(RcHashCodes.CombineHashCodes(0, 0), Is.EqualTo(0));
+        Assert.That(RcHashCodes.CombineHashCodes(int.MaxValue, int.MaxValue), Is.EqualTo(32));
+        Assert.That(RcHashCodes.CombineHashCodes(int.MaxValue, int.MinValue), Is.EqualTo(-33));
+        Assert.That(RcHashCodes.CombineHashCodes(int.MinValue, int.MinValue), Is.EqualTo(0));
+        Assert.That(RcHashCodes.CombineHashCodes(int.MinValue, int.MaxValue), Is.EqualTo(-1));
+        Assert.That(RcHashCodes.CombineHashCodes(int.MaxValue / 2, int.MaxValue / 2), Is.EqualTo(32));
+    }
+
+    [Test]
+    public void TestIntHash()
+    {
+        Assert.That(RcHashCodes.WangHash(0), Is.EqualTo(4158654902));
+        Assert.That(RcHashCodes.WangHash(1), Is.EqualTo(357654460));
+        Assert.That(RcHashCodes.WangHash(2), Is.EqualTo(715307540));
+        Assert.That(RcHashCodes.WangHash(3), Is.EqualTo(1072960876));
+        
+        Assert.That(RcHashCodes.WangHash(4), Is.EqualTo(1430614333));
+        Assert.That(RcHashCodes.WangHash(5), Is.EqualTo(1788267159));
+        Assert.That(RcHashCodes.WangHash(6), Is.EqualTo(2145921005));
+        Assert.That(RcHashCodes.WangHash(7), Is.EqualTo(2503556531));
+        
+        Assert.That(RcHashCodes.WangHash(8), Is.EqualTo(2861226262));
+        Assert.That(RcHashCodes.WangHash(9), Is.EqualTo(3218863982));
+        Assert.That(RcHashCodes.WangHash(10), Is.EqualTo(3576533554));
+        Assert.That(RcHashCodes.WangHash(11), Is.EqualTo(3934169234));
+        
+        //
+        Assert.That(RcHashCodes.WangHash(int.MaxValue), Is.EqualTo(1755403298));
+        Assert.That(RcHashCodes.WangHash(uint.MaxValue), Is.EqualTo(3971045735));
+    }
+}

test/DotRecast.Core.Test/Vector3Test.cs

@@ -5,7 +5,7 @@ using NUnit.Framework;
 
 namespace DotRecast.Core.Test;
 
-public class Vector3Tests
+public class Vector3Test
 {
     [Test]
     [Repeat(100000)]