Beginning 3D Game Programming

Displaying the Rear-View Mirror

Now that you have the scene rendered into your texture, it should be a simple matter to get that displayed onscreen. Because it is a single texture, you can re-use the sprite class you used for the background of the user screen to render the rear-view mirror. In the OnFrameRender method, find the call to RenderScene and add this code snippet, which should show you a scene similar to Figure 22.3:

// Render the rear-view mirror texture
backgroundSprite.Begin(SpriteFlags.None);
backgroundSprite.Draw2D(rearTexture, System.Drawing.Rectangle.Empty,
    new System.Drawing.Rectangle(0,0,256,128), new System.Drawing.Point(200, 0),
    unchecked((int)0xffffffff));
backgroundSprite.End();

Figure 22.3. A rear-view mirror.

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