A new design for wave power can generate electricity regardless of direction of waves. This is still in initial testing. However, given the huge amount of potential energy in waves, should wave power become commercially viable, we could probably power the planet from wave power alone.
In wave tanks at Lancaster University, the chain of loosely coupled pistons was able to absorb forces from all directions. The conditions in the tank were modeled after the data taken from buoys off the Orkney Islands.
http://youtu.be/07ViATIJUxs