title: Android OpenGLES 2.0 Buttons
body: <p>I am a newbee to android OpenGL i am trying to draw buttons using OpenGL I have added a Gesture Listener for the GLSurface View now i have motionevent when ever the user touches. My question is how can i convert motionevent.getx and motionevent.gety (which are in pixel range
  )to window or Object coordinates of the view?</p>