perturbation texture

how can I perturbate a texture with an other gray scale texture in order to do a C&C generals water effect like

thanks you

Hum differtently said I want to achive a water effect like water effect with bump in the DirectX 8 sdk
so an environementale map perturbered by a bump map …

So it is a Environment Bump Mapping but I just find a example for nvidia card using nvidia ext and it must works on all cards …


[This message has been edited by IronRaph (edited 03-12-2003).]