Update ArrayUtility.cs

src/Utils/ArrayUtility.cs

@@ -1,4 +1,8 @@
-namespace DCFApixels.DragonECS.Utils
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+using System;
+
+namespace DCFApixels.DragonECS.Utils
 {
     internal static class ArrayUtility
     {
@@ -12,4 +16,39 @@
                 array[i] = value;
         }
     }
+
+    internal static unsafe class UnmanagedArrayUtility
+    {
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void* New<T>(int capacity) where T : struct
+        {
+            return Marshal.AllocHGlobal(Marshal.SizeOf(typeof(T)) * capacity).ToPointer();
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void* NewAndInit<T>(int capacity) where T : struct
+        {
+            int newSize = Marshal.SizeOf(typeof(T)) * capacity;
+            byte* newPointer = (byte*)Marshal.AllocHGlobal(newSize).ToPointer();
+
+            for (int i = 0; i < newSize; i++)
+                *(newPointer + i) = 0;
+
+            return newPointer;
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void Free(void* pointer)
+        {
+            Marshal.FreeHGlobal(new IntPtr(pointer));
+        }
+
+        [MethodImpl(MethodImplOptions.AggressiveInlining)]
+        public static void* Resize<T>(void* oldPointer, int newCount) where T : struct
+        {
+            return (Marshal.ReAllocHGlobal(
+                new IntPtr(oldPointer),
+                new IntPtr(Marshal.SizeOf(typeof(T)) * newCount))).ToPointer();
+        }
+    }
 }