title: How to set a CVPixelBuffer as an input for a vertex shader?
body: <p>I would like to use Apple Metal render path for processing a CVPixelBuffer.</p>
  
  <p>How can i transform a CVPixelBuffer so it would conform as an input for a vertex shader?
  Not sure how to extract the color/position values from a CVPixelBuffer so i would be able setting them from the host.</p>