HashBuilder is a class for constructing a hash of a bunch of different elements

Author: rms80

core/HashUtil.cs

@@ -0,0 +1,104 @@
+using System;
+
+
+namespace g3
+{
+    /// <summary>
+    /// Construct hash of multiple values using FNV hash (ish)
+    /// http://www.isthe.com/chongo/tech/comp/fnv/
+    /// 
+    /// (should probably be using uint? but standard GetHashCode() returns int...)
+    /// </summary>
+    public struct HashBuilder
+    {
+        public int Hash;
+
+        public HashBuilder(int init = unchecked((int)2166136261) )
+        {
+            Hash = init;
+        }
+
+
+        public void Add(int i) {
+            unchecked {
+                Hash = (Hash * 16777619) ^ i.GetHashCode();
+            }
+        }
+
+        public void Add(double d) {
+            unchecked {
+                Hash = (Hash * 16777619) ^ d.GetHashCode();
+            }
+        }
+
+        public void Add(float f) {
+            unchecked {
+                Hash = (Hash * 16777619) ^ f.GetHashCode();
+            }
+        }
+
+
+        public void Add(Vector2f v) {
+            unchecked {
+                Hash = (Hash * 16777619) ^ v.x.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.y.GetHashCode();
+            }
+        }
+
+        public void Add(Vector2d v)
+        {
+            unchecked {
+                Hash = (Hash * 16777619) ^ v.x.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.y.GetHashCode();
+            }
+        }
+
+        public void Add(Vector3f v) {
+            unchecked {
+                Hash = (Hash * 16777619) ^ v.x.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.y.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.z.GetHashCode();
+            }
+        }
+
+        public void Add(Vector3d v)
+        {
+            unchecked {
+                Hash = (Hash * 16777619) ^ v.x.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.y.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.z.GetHashCode();
+            }
+        }
+
+        public void Add(Frame3f f)
+        {
+            unchecked {
+                Hash = (Hash * 16777619) ^ f.Origin.x.GetHashCode();
+                Hash = (Hash * 16777619) ^ f.Origin.y.GetHashCode();
+                Hash = (Hash * 16777619) ^ f.Origin.z.GetHashCode();
+                Hash = (Hash * 16777619) ^ f.Rotation.x.GetHashCode();
+                Hash = (Hash * 16777619) ^ f.Rotation.y.GetHashCode();
+                Hash = (Hash * 16777619) ^ f.Rotation.z.GetHashCode();
+                Hash = (Hash * 16777619) ^ f.Rotation.w.GetHashCode();
+            }
+        }
+
+        public void Add(Index3i v) {
+            unchecked {
+                Hash = (Hash * 16777619) ^ v.a.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.b.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.c.GetHashCode();
+            }
+        }
+
+        public void Add(Index2i v) {
+            unchecked {
+                Hash = (Hash * 16777619) ^ v.a.GetHashCode();
+                Hash = (Hash * 16777619) ^ v.b.GetHashCode();
+            }
+        }
+
+    }
+
+
+}