Add manual Vk file with Create and Clone methods

Author: Exanite

sources/Vulkan/Vulkan/Vk.cs

@@ -0,0 +1,55 @@
+using Silk.NET.Core.Loader;
+
+namespace Silk.NET.Vulkan;
+
+public partial class Vk
+{
+    public static IVk Create()
+    {
+        var context = new NativeContext();
+        var vk = new Vk(context);
+
+        context.Vk = vk;
+
+        return vk;
+    }
+
+    public unsafe IVk Clone()
+    {
+        var context = new NativeContext();
+        var vk = new Vk(context);
+
+        context.Vk = vk;
+
+        vk.CurrentInstance = CurrentInstance;
+        vk.CurrentDevice = CurrentDevice;
+        Array.Copy(_slots, vk._slots, _slots.Length);
+
+        return vk;
+    }
+
+    private class NativeContext : INativeContext
+    {
+        public Vk Vk { get; set; } = null!;
+        private IVk Ivk => Vk;
+
+        public unsafe void* LoadFunction(string functionName, string libraryNameHint)
+        {
+            if (functionName.EndsWith("ProcAddr"))
+            {
+                return null;
+            }
+
+            void* ptr = Ivk.GetDeviceProcAddr(Vk.CurrentDevice.GetValueOrDefault(), functionName);
+            if (ptr != null)
+            {
+                return ptr;
+            }
+
+            ptr = Ivk.GetInstanceProcAddr(Vk.CurrentInstance.GetValueOrDefault(), functionName);
+            return ptr;
+        }
+
+        public void Dispose() {}
+    }
+}