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POWhy is creating a GraphicsDevice causing an "unexpected error" on instantiation?
 

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  1. POWhy is creating a GraphicsDevice causing an "unexpected error" on instantiation?
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    <p>I'm trying to embed a bare bones XNA application in a Winforms MDI application, and I seem to be having issues. I am following the example of <a href="http://xbox.create.msdn.com/en-US/education/catalog/sample/winforms_series_1" rel="nofollow">http://xbox.create.msdn.com/en-US/education/catalog/sample/winforms_series_1</a> and I'm not sure what I'm doing wrong.</p> <p>In my MDI parent I am instantiating the rendering form via:</p> <pre><code> private void MainForm_Load(object sender, EventArgs e) { var render = new RenderForm(); render.MdiParent = this; render.Show(); } </code></pre> <p>The code for my rendering form is:</p> <pre><code>public class RenderForm : Form { private XnaRenderer _renderer; protected override void OnCreateControl() { if (!DesignMode) _renderer = new XnaRenderer(Handle, ClientSize.Width, ClientSize.Height); base.OnCreateControl(); } protected override void OnPaint(PaintEventArgs e) { _renderer.RenderScene(null); } } </code></pre> <p>So when the form is created, it attempts to create an instance of my <code>XnaRenderer</code> class. <code>ClientSize.Width</code> is 284 and <code>ClientSize.Height</code> is 261, and the <code>Handle</code> looks to be valid. The constructor's code is:</p> <pre><code> public XnaRenderer(IntPtr windowHandle, int width, int height) { _graphicsService = new GraphicsDeviceService(windowHandle, width, height); SetViewport(width, height); } </code></pre> <p>The <code>GraphicsDeviceService</code> class is essentially the same as the one from the example code, but it's made to not be a singleton. The code for the constructor is:</p> <pre><code> public GraphicsDeviceService(IntPtr windowHandle, int width, int height) { _presentationParams = new PresentationParameters { BackBufferFormat = SurfaceFormat.Color, BackBufferHeight = Math.Max(height, 1), BackBufferWidth = Math.Max(width, 1), DepthStencilFormat = DepthFormat.Depth24, DeviceWindowHandle = windowHandle, PresentationInterval = PresentInterval.Immediate }; _graphicsDevice = new GraphicsDevice(GraphicsAdapter.DefaultAdapter, GraphicsProfile.Reach, _presentationParams); } </code></pre> <p>However, when the <code>GraphicsDevice</code> object is instantiated I get the following <code>InvalidOperationException</code>: </p> <blockquote> <p>An unexpected error has occurred.</p> </blockquote> <p>There is no more to the exception's message and no inner exception, making this pretty hard to debug without a lot of XNA knowledge.</p> <p>Does anyone see something I am doing wrong?</p>
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    1. COAre you sure your _presentationParams valid? Also, does anything need to be created before GraphicsDevice? These are the things I would be checking.
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    2. COWhat do you mean by valid? It's an instantiated object
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    3. CO"The `GraphicsDeviceService` class is essentially the same as the one from the example code, but it's made to not be a singleton." <- I'm curious as to why you made this change?
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      1. USAndrew Russell
 

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