Bring back the shading pipeline from the object shader.
Bring back the shading pipeline from the object shader.

We can compute shading and shadowing as before, but now the
computations are done once exactly per pixel.
We don't have restored parallax mapping yet.


Former-commit-id: 114d0a454f80d5a94eecf9a3eb1147eac3bed3fe
kosua20/GL_Template,kosua20/GL_Template