Initial Commit

Library/PackageCache/com.unity.timeline@1.5.4/Runtime/Utilities/HashUtility.cs

@@ -0,0 +1,51 @@
+namespace UnityEngine.Timeline
+{
+    static class HashUtility
+    {
+        // Note. We could have used "params int[] hashes" but we want to avoid allocating.
+
+        public static int CombineHash(this int h1, int h2)
+        {
+            return h1 ^ (int)(h2 + 0x9e3779b9 + (h1 << 6) + (h1 >> 2)); // Similar to c++ boost::hash_combine
+        }
+
+        public static int CombineHash(int h1, int h2, int h3)
+        {
+            return CombineHash(h1, h2).CombineHash(h3);
+        }
+
+        public static int CombineHash(int h1, int h2, int h3, int h4)
+        {
+            return CombineHash(h1, h2, h3).CombineHash(h4);
+        }
+
+        public static int CombineHash(int h1, int h2, int h3, int h4, int h5)
+        {
+            return CombineHash(h1, h2, h3, h4).CombineHash(h5);
+        }
+
+        public static int CombineHash(int h1, int h2, int h3, int h4, int h5, int h6)
+        {
+            return CombineHash(h1, h2, h3, h4, h5).CombineHash(h6);
+        }
+
+        public static int CombineHash(int h1, int h2, int h3, int h4, int h5, int h6, int h7)
+        {
+            return CombineHash(h1, h2, h3, h4, h5, h6).CombineHash(h7);
+        }
+
+        public static int CombineHash(int[] hashes)
+        {
+            if (hashes == null || hashes.Length == 0)
+                return 0;
+
+            var h = hashes[0];
+            for (int i = 1; i < hashes.Length; ++i)
+            {
+                h = CombineHash(h, hashes[i]);
+            }
+
+            return h;
+        }
+    }
+}