3D Basics using Silverlight-5 and XNA (Part 2)

using System.Windows.Controls;
using System.Windows.Graphics;
using Microsoft.Xna.Framework;
using Microsoft.Xna.Framework.Graphics;
using System.Windows;

namespace Polyhedron
{
  public partial class MainPage : UserControl
  {
    private float aspectRatio = 1f;
    private VertexBuffer vb;
    private Texture2D texture;
    private BasicEffect basicEffect;

    public MainPage()
    {
      InitializeComponent();
    }

    private void drawingSurface1_Loaded(object sender, System.Windows.RoutedEventArgs e)
    {
      if (Is3dBlocked())
        return;
      if (GraphicsDeviceManager.Current.RenderMode != RenderMode.Hardware)
      {
        MessageBox.Show(GraphicsDeviceManager.Current.RenderModeReason.ToString());
        return;
      }
      
      GraphicsDevice g = GraphicsDeviceManager.Current.GraphicsDevice;

      VertexPositionNormalTexture[] vertices = new VertexPositionNormalTexture[]{
        new VertexPositionNormalTexture(new Vector3(-1, -1, 0),Vector3.Forward,Vector2.Zero),
        new VertexPositionNormalTexture(new Vector3(0, 1, 0),Vector3.Forward,Vector2.Zero),
        new VertexPositionNormalTexture(new Vector3(1, -1, 0),Vector3.Forward,Vector2.Zero)};
      vb = new VertexBuffer(g, VertexPositionNormalTexture.VertexDeclaration, vertices.Length, BufferUsage.WriteOnly);
      vb.SetData(0, vertices, 0, vertices.Length, 0);

      texture = new Texture2D(g, 1, 1, false, SurfaceFormat.Color);
      texture.SetData<Color>(new Color[1] { new Color(1f, 0, 0) });

      basicEffect = new BasicEffect(g);
      basicEffect.EnableDefaultLighting();
      basicEffect.LightingEnabled = true;
      basicEffect.Texture = texture;
      basicEffect.TextureEnabled = true;
    }

    private bool Is3dBlocked()
    {
      if (GraphicsDeviceManager.Current.RenderMode == RenderMode.Hardware)
        return false;
      string message;
      switch (GraphicsDeviceManager.Current.RenderModeReason)
      {
        case RenderModeReason.Not3DCapable:
          message = "You graphics hardware is not capable of displaying this page ";
          break;
        case RenderModeReason.GPUAccelerationDisabled:
          message = "Hardware graphics acceleration has not been enabled on this web page.\n\n" +
            "Please notify the web site owner.";
          break;
        case RenderModeReason.TemporarilyUnavailable:
          message = "Your graphics hardware is temporarily unavailable.\n\n" +
            "Try reloading the web page or restarting your browser.";
          break;
        case RenderModeReason.SecurityBlocked:
          message =
            "You need to configure your system to allow this web site to display 3D graphics:\n\n" +
            "  1. Right-click the page\n" +
            "  2. Select 'Silverlight'\n" +
            "     (The 'Microsoft Silverlight Configuration' dialog will be displayed)\n" +
            "  3. Select the 'Permissions' tab\n" +
            "  4. Find this site in the list and change its 3D Graphics permission from 'Deny' to 'Allow'\n" +
            "  5. Click 'OK'\n" +
            "  6. Reload the page";
          break;
        default:
          message = "Unknown error";
          break;
      }
      MessageBox.Show(message, "3D Content Blocked", MessageBoxButton.OK);
      return true;
    }

    private void drawingSurface1_SizeChanged(object sender, System.Windows.SizeChangedEventArgs e)
    {
      aspectRatio = (float)(drawingSurface1.ActualWidth / drawingSurface1.ActualHeight);
    }

    private void drawingSurface1_Draw(object sender, DrawEventArgs e)
    {
      GraphicsDevice g = GraphicsDeviceManager.Current.GraphicsDevice;
      g.RasterizerState = RasterizerState.CullNone;
      g.SetVertexBuffer(vb);

      basicEffect.World = Matrix.CreateRotationY((float)e.TotalTime.TotalSeconds * 2);
      basicEffect.View = Matrix.CreateLookAt(new Vector3(0, 0, 5.0f), Vector3.Zero, Vector3.Up);
      basicEffect.Projection = Matrix.CreatePerspectiveFieldOfView(0.85f, aspectRatio, 0.01f, 1000.0f);

      g.Clear(new Color(0.8f, 0.8f, 0.8f, 1.0f));
      basicEffect.CurrentTechnique.Passes[0].Apply();
      g.DrawPrimitives(PrimitiveType.TriangleList, 0, 1);
      e.InvalidateSurface();
    }
  }
}