title: Shaders management
body: <p>I am learning about GLSL in order to manage it in my IOS &amp; android C++ engine.
  I get a lot of documentation about syntax and GLSL programming but I need some tutorials about how to manage it in a complete scene (How to apply a shader only on a specific object of the scene ? How combine several effects on an object ? )</p>
  
  <p>Do you have some links or book reference to send me ? </p>