title: OpenGL 2d water simulation
body: <p>I am developing a game for android with opengl2 es i i want a effect like this:
  <a href="https://lh6.ggpht.com/RF0R32tKjDhQcjNTtW51xd-giuXp-FlsDJaqscilDetI7cMpNQwUDjCryT2qyyBzT6PZ" rel="nofollow">https://lh6.ggpht.com/RF0R32tKjDhQcjNTtW51xd-giuXp-FlsDJaqscilDetI7cMpNQwUDjCryT2qyyBzT6PZ</a></p>
  
  <p>I supposse that the light is done with normal mapping(am i right?)</p>
  
  <p>but I suposse to that there is some type of distorsion on the behing texture, to simulate de waves. </p>
  
  <p>Which math function could I use to simulate the noise that appears in the image?</p>
  
  <p>thanks</p>