@Override
    public void glReadPixels(int x, int y, int width, int height, int format, int type, long offset) {
        // TODO: no offset???
        JmeIosGLES.glReadPixels(x, y, width, height, format, type, null);
    }
Implements OpenGL ES 2.0 and 3.0 for iOS. 

@author Kirill Vainer, Jesus Oliver
jme3-ios/src/main/java/com/jme3/renderer/ios/IosGL.java