it has! dx, and opengl are coupled to a shader model. Like DX10 has model4.0 DX9 had 3.0 and 2.0 and DX11 has model5.0. I do not mean the shader processors within the GPU, but the shaders as meant as the thing that make light have influence on textures, with the use of normal maps...
oh and if u want to integrate it, i'd be happy to make all the normal maps!