Update World.hpp

Improve performance when zooming out all the way.

Core/include/Core/World.hpp

@@ -12,16 +12,14 @@
 
 #pragma once
 
-
-
-/// Implements a naiive-AF hashing algorithm for Vector2 class
-/// So we can use it as unique keys in std::unordered_map
 template<>
 struct std::hash<Vector2i>
 {
     std::size_t operator()(const Vector2i& k) const
     {
-        return  k.x; //Math::Pow(k.x, 3) + Math::Pow(k.y, 2);
+        // Read 2x int32_t into one int64_t and return std::hash<int64_t> to prevent collisions.
+        // This doesn't really gain any performance until you zoom out a lot.
+        return std::hash<int64_t>()(((int64_t) k.x << 32) | ((int64_t) k.y));
     }
 };