title: converting hybrid cg/hlsl shaders to glsl es
body: <p>I am looking for a tool that can convert cg/hlsl hybrid shaders to glsl es shaders. I have tried hlsl2glsl which doesnt understand the keyword 'extern' although it is a viable hlsl keyword and have looked to cgc but have found no documentation on how to compile for glsl es.</p>
  
  <p>Thanks</p>