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// Copyright (c) 2019 Jean-Philippe Bruyère <jp_bruyere@hotmail.com>
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Runtime.InteropServices;
using static Vulkan.Vk;
namespace Vulkan {
public static class ExtensionMethods {
#region pinning
/// <summary>
/// list of pinned GCHandles used to pass value from managed to unmanaged code.
/// </summary>
public static Dictionary<object, GCHandle> handles = new Dictionary<object, GCHandle>();
/// <summary>
/// Unpin the specified object and free the GCHandle associated.
/// </summary>
public static void Unpin (this object obj) {
if (!handles.ContainsKey (obj)) {
Debug.WriteLine ("Trying to unpin unpinned object: {0}.", obj);
return;
}
handles[obj].Free ();
handles.Remove (obj);
}
/// <summary>
/// Pin the specified object and return a pointer. MUST be Unpined as soon as possible.
/// </summary>
public static IntPtr Pin (this object obj) {
if (handles.ContainsKey (obj)) {
Debug.WriteLine ("Trying to pin already pinned object: {0}", obj);
return handles[obj].AddrOfPinnedObject ();
}
GCHandle hnd = GCHandle.Alloc (obj, GCHandleType.Pinned);
handles.Add (obj, hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr Pin<T> (this IEnumerable<T> obj) {
if (handles.ContainsKey (obj))
Debug.WriteLine ("Pinning already pinned object: {0}", obj);
GCHandle hnd = GCHandle.Alloc (obj.ToArray(), GCHandleType.Pinned);
handles.Add (obj, hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr Pin<T> (this T[] obj) {
if (handles.ContainsKey (obj))
Debug.WriteLine ("Pinning already pinned object: {0}", obj);
GCHandle hnd = GCHandle.Alloc (obj, GCHandleType.Pinned);
handles.Add (obj, hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr Pin (this string obj) {
if (handles.ContainsKey (obj)) {
Debug.WriteLine ("Trying to pin already pinned object: {0}", obj);
return handles[obj].AddrOfPinnedObject ();
}
byte[] n = System.Text.Encoding.UTF8.GetBytes(obj +'\0');
GCHandle hnd = GCHandle.Alloc (n, GCHandleType.Pinned);
handles.Add (obj, hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr PinPointer (this string obj) {
byte[] n = System.Text.Encoding.UTF8.GetBytes(obj +'\0');
GCHandle hnd = GCHandle.Alloc (n, GCHandleType.Pinned);
handles.Add (hnd.AddrOfPinnedObject (), hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr PinPointer (this object obj) {
#if DEBUG
if (obj == null)
Debug.WriteLine ("Trying to pin null object: {0}", obj);
#endif
GCHandle hnd = GCHandle.Alloc (obj, GCHandleType.Pinned);
handles.Add (hnd.AddrOfPinnedObject (), hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr PinPointer<T> (this IEnumerable<T> obj) {
#if DEBUG
if (obj == null)
Debug.WriteLine ("Trying to pin null object: {0}", obj);
#endif
GCHandle hnd = GCHandle.Alloc (obj.ToArray(), GCHandleType.Pinned);
handles.Add (hnd.AddrOfPinnedObject (), hnd);
return hnd.AddrOfPinnedObject ();
}
//pin with pinning context
public static IntPtr Pin (this object obj, PinnedObjects ctx) {
GCHandle hnd = GCHandle.Alloc (obj, GCHandleType.Pinned);
ctx.Handles.Add (hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr Pin<T> (this IList<T> obj, PinnedObjects ctx) {
GCHandle hnd = GCHandle.Alloc (obj.ToArray (), GCHandleType.Pinned);
ctx.Handles.Add (hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr Pin<T> (this T[] obj, PinnedObjects ctx) {
GCHandle hnd = GCHandle.Alloc (obj, GCHandleType.Pinned);
ctx.Handles.Add (hnd);
return hnd.AddrOfPinnedObject ();
}
public static IntPtr Pin (this string obj, PinnedObjects ctx) {
byte[] n = System.Text.Encoding.UTF8.GetBytes (obj + '\0');
GCHandle hnd = GCHandle.Alloc (n, GCHandleType.Pinned);
ctx.Handles.Add (hnd);
return hnd.AddrOfPinnedObject ();
}
#endregion
}
}
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