The complete tutorial on how to render Normal Maps using OpenGL can be found here:
http://www.haroldserrano.com/blog/how-to-apply-a-normal-map-in-opengl
Applying Normal maps to objects using OpenGL ES 2.0 in iOS
Objective-C++MIT
The complete tutorial on how to render Normal Maps using OpenGL can be found here:
http://www.haroldserrano.com/blog/how-to-apply-a-normal-map-in-opengl