title: How do I flip a sprite/texture in OpenGLES?
body: <p>I have a sprite loaded as a texture and I need to animate it, allowing it to "face" left or right -- essentially sometimes I need to "flip" it.   I know that OpenGL has a gltranslate which repositions an object, and glrotate which rotates it.   Is there a method that simply flips it across one axis?  If not, how would you accomplish this?</p>