81 lines
2.9 KiB
C#
81 lines
2.9 KiB
C#
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// Copyright (c) 2010-2014 SharpDX - Alexandre Mutel
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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using System;
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using System.Runtime.InteropServices;
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namespace SharpDX
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{
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/// <summary>
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/// An Interface shadow callback
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/// </summary>
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internal abstract class CppObjectShadow : CppObject
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{
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/// <summary>
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/// Gets the callback.
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/// </summary>
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public ICallbackable Callback { get; private set; }
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/// <summary>
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/// Gets the VTBL associated with this shadow instance.
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/// </summary>
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protected abstract CppObjectVtbl GetVtbl { get; }
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/// <summary>
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/// Initializes the specified shadow instance from a vtbl and a callback.
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/// </summary>
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/// <param name="callbackInstance">The callback.</param>
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public unsafe virtual void Initialize(ICallbackable callbackInstance)
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{
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this.Callback = callbackInstance;
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// Allocate ptr to vtbl + ptr to callback together
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NativePointer = Marshal.AllocHGlobal(IntPtr.Size * 2);
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var handle = GCHandle.Alloc(this);
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Marshal.WriteIntPtr(NativePointer, GetVtbl.Pointer);
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*((IntPtr*) NativePointer + 1) = GCHandle.ToIntPtr(handle);
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}
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protected unsafe override void Dispose(bool disposing)
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{
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if (NativePointer != IntPtr.Zero)
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{
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// Free the GCHandle
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GCHandle.FromIntPtr(*(((IntPtr*)NativePointer) + 1)).Free();
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// Free instance
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Marshal.FreeHGlobal(NativePointer);
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NativePointer = IntPtr.Zero;
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}
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Callback = null;
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base.Dispose(disposing);
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}
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internal static T ToShadow<T>(IntPtr thisPtr) where T : CppObjectShadow
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{
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unsafe
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{
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return (T)GCHandle.FromIntPtr(*(((IntPtr*)thisPtr) + 1)).Target;
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}
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}
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}
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}
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