Bumb-map Shadows or Horizon map shadows

Hi, I'm interested in your plugin (I'll be your customer most probably by the end of the month =) , Ican't wait to work with SF),  though I have a question, is it possible (and would it be relatively easy\performative) to simulate real time self shadows for textures provided of albedo - normal - tessellation\displacement textures ?
I post an example image of a simple cube with parallax\tessellation ready texture and self shadows.
images

Thank you very much.
P.s. I could not find a forum for general questions, I apologize if I'm posting in the wrong place.