title: What kind of blurs can be implemented in pixel shaders?
body: <p>Gaussian, box, radial, directional, motion blur, zoom blur, etc.</p>
  
  <p>I read that Gaussian blur can be broken down in passes that could be implemented in pixel shaders, but couldn't find any samples.</p>
  
  <p>Is it right to assume that any effect that concerns itself with pixels other than itself, can't be implemented in pixel shaders?</p>