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POAugmented reality: camera stream on OpenGL view
 

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    <p>AR (augmented reality) seems to be what all iOs developer are looking at this days. I'm playing with a very classic pet project, rolling dices with textures and if possible the camera stream on a dice facet. I face a few issues for this last part and I have some questions for the experts:</p> <p>Getting the video stream requires AV Foundation : <code>AVCaptureVideoDataOutputSampleBufferDelegate</code> to get an image buffer, and then build a <code>UIImage</code> using Quartz function like <code>CGBitmapContextCreate</code>. This is demonstrated in <a href="http://www.benjaminloulier.com/articles/ios4-and-direct-access-to-the-camera" rel="nofollow">http://www.benjaminloulier.com/articles/ios4-and-direct-access-to-the-camera</a> or in the apple AV Foundation Programming Guide (see <a href="https://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/04_MediaCapture.html#//apple_ref/doc/uid/TP40010188-CH5-SW30" rel="nofollow">https://developer.apple.com/library/ios/#documentation/AudioVideo/Conceptual/AVFoundationPG/Articles/04_MediaCapture.html#//apple_ref/doc/uid/TP40010188-CH5-SW30</a>)</p> <p>Then I can create a texture like I did for my "still" images and use it with a <code>GLKBaseEffect</code> (or a shader?).</p> <p>Question 1: <code>GLKBaseEffect</code> seems really nice and simple, but should I aim for OpenGL 2 and shaders ? </p> <p>Now the RosyWriter demo from apple uses the Core Video <code>CVOpenGLESTextureCacheCreateTextureFromImage</code> function to bind directly the texture without creating an intermediary <code>UIImage</code>. This is - as stated in the demo description - new in IOS 5.</p> <p>Question 2: is this a better way to map the texture ?</p> <p>Question 3: There are a few interesting frameworks, like GPUImage, or even 3D Gaming frameworks that could be used too. Has anyone some feedback on using these ? The apple provided frameworks seem quite complete to me so far.</p> <p>Thanks a lot !</p>
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