iPhone/iPad rimlight shader?

In the midst of creating a new iOS platformer. Trying to figure out if a rimlight shader(preferably without the need for dynamic lighting) is possible? Is there one? Didn’t find any information out there. May have been called something else. If it requires OpenGL 2.0 I am cool with that. In fact, I would pay for a lightmapped, specular, bumped, rimlit shader if it hasn’t been done and is possible!!!

Trying to create very soft edge lighting FX with minimal hit(of course) to performance. Thanks for your time.

Regards,

Gary Haus

You could do a rim light easily enough as it’s based on view direction but specular and bump mapping are based on scene lighting and would be a lot more expensive.