blob: 783e75720d870ab9c313df3fec70c2c63745b742 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
//
// Copyright (c) 2022 JP Bruyère
using System;
using System.Linq;
using System.Runtime.InteropServices;
namespace Vulkan
{
/// <summary>
/// Helper class to construct pnext chain
/// </summary>
public class PNext<T> : IDisposable where T : struct
{
IntPtr handle;
/// <summary>
/// Allocate on HGlobal a new structure of type T, ensure instance is Disposed.
/// </summary>
public PNext () {
init();
}
/// <summary>
/// Allocate on HGlobal a new structure of type T and set the pNext field,
/// ensure instance is Disposed.
/// </summary>
public PNext (IntPtr pNext) {
init();
Marshal.WriteIntPtr(handle + 4, pNext);
}
void init() {
handle = Marshal.AllocHGlobal(Marshal.SizeOf<T>());
Type t = typeof(T);
StructureTypeAttribute st = (StructureTypeAttribute)t.GetCustomAttributes(typeof(StructureTypeAttribute), false).FirstOrDefault();
Marshal.WriteInt32(handle, st.StructureType);
}
/// <summary>
/// Get value of T
/// </summary>
public T Val => Marshal.PtrToStructure<T> (handle);
public static implicit operator IntPtr(PNext<T> pn) => pn.handle;
public void Dispose()
{
Marshal.FreeHGlobal(handle);
}
}
}
|
