Is bump mapping done on the Pixel shader or TMU?

[Techno+]

hi guys,

AS far as i know bump mapping allows for lightning to be directly controlled by textures, instead of having to compute lightning on the surface after texture mapping, here comes my question, is bump mapping done on the TMU or Pixel shader?

Thanks

 

[K.I.L.E.R]

Either on the PS or register combiners on older cards.