List of iPad capable shaders?

I am curious if anyone has a recent list of the shading capabilities of an iPad?

Are we reduced to ONLY vertex shading ? It is openGL I thought?

Specular? Diffuse? Normal Mapping? Post render process like film grain, image blurring?

Appreciate the heads up !

Yes to all those effects, as long as you use OpenGL ES 2.0, though be aware of the performance implications of this. (Can only use with iPhone 3GS and later, and the equivalent iPod touch.)