How can I initialize my WPF Monogame ContentManager? - wpf

Question

I have followed the monogame wpf sample and the old XNA wpf sample to create a view in WPF with a loaded model through monogame (I'm also using mvvmlight but that shouldn't matter much I hope).
Everything else works except the contentManager I.e. Making a cube out of vertices is displayed fine with a local instance of GraphicsDevice
Depending on whether I use IntPtr.Zero or the actual window handle to create the instance of GraphicsDevice I get a different error and neither give many details so I don't know which I should persue...
When I use IntPtr.Zero
_services = new ServiceContainer();
_services.AddService(typeof(IGraphicsDeviceService), _graphicsDeviceService);
ContentManager content = new ContentManager(_services, "");
var model = content.Load<Model3D>("psp"); // At this line
I get an error about
"The type initializer for 'Microsoft.Xna.Framework.TitleContainer' threw an exception."
Inner Exception: The process has no package identity. (Exception from HRESULT: 0x80073D54)
But when I use the Actual WindowPointer I get this error
Managed Debugging Assistant 'FatalExecutionEngineError' has detected a problem in 'E:\Documents\Visual Studio 2013\Projects\XSITE2DEV\xSite2Dev\MvvmMonogameTest\bin\Debug\MvvmMonogameTest.vshost.exe'.
Additional information: The runtime has encountered a fatal error. The address of the error was at 0x71985144, on thread 0x5f38. The error code is 0xc0000005. This error may be a bug in the CLR or in the unsafe or non-verifiable portions of user code. Common sources of this bug include user marshaling errors for COM-interop or PInvoke, which may corrupt the stack.
In the GraphicsDeviceService creating the first instance of GraphicsDevice
I get my window pointer by using these methods
/// <summary>
/// Gets a reference to the singleton instance.
/// </summary>
public static GraphicsDeviceService AddRef(int width, int height)
{
var singletonInstance = SimpleIoc.Default.GetService(typeof(IGraphicsDeviceService)) as GraphicsDeviceService;
// Increment the "how many controls sharing the device" reference count.
if (Interlocked.Increment(ref _referenceCount) == 1)
{
// If this is the first control to start using the
// device, we must create the device.
singletonInstance.EnsureGraphicsDevice();
}
return singletonInstance;
}
private void EnsureGraphicsDevice()
{
if (_graphicsDevice != null)
return;
//CreateDevice(IntPtr.Zero, 1, 1);
CreateDevice(new WindowInteropHelper(Application.Current.MainWindow).Handle, 1, 1);
}
private void CreateDevice(IntPtr windowHandle, int width, int height)
{
_parameters = new PresentationParameters
{
BackBufferWidth = Math.Max(width, 1),
BackBufferHeight = Math.Max(height, 1),
BackBufferFormat = SurfaceFormat.Color,
DepthStencilFormat = DepthFormat.Depth24,
DeviceWindowHandle = windowHandle,
PresentationInterval = PresentInterval.Immediate,
IsFullScreen = false
};
_graphicsDevice = new GraphicsDevice(
GraphicsAdapter.DefaultAdapter,
GraphicsProfile.HiDef,
_parameters);
if (DeviceCreated != null)
DeviceCreated(this, EventArgs.Empty);
}
I feel like using the actual window pointer is the correct approach but the error has no further details so I can't go anywhere with it..

Answer 1

I came across a similar error while using an implementation as yours. For me, it occured because Game.Instance was null and if you look up the source code of GraphicsDevice at the MonoGame source, you will find that the constructor depends on that (at least in OpenGL).This link could be helpful:
https://github.com/mono/MonoGame/issues/2586
Basically, you have two options:
Bringing a Game in (e.g. inheriting from Game) will set Game.Instance in the constructor
Customizing the MonoGame Source to use your Handle
By the way I am not 100% sure that this is what is causing your error message.
I know that this post is old and I am quite likely too late but this may be helpful for anybody else who is experiencing this error.