opengl matrix rotation quaternions

Question

Im trying to do a simple rotation of a cube about the x and y axis:

I want to always rotate the cube over the x axis by an amount x and rotate the cube over the yax

Answer 1

It is not clear what you want to achieve. Perhaps you should think about some points and where you want them to rotate to -- e.g. vertex (1,1,1) should map to (0,1,0). Then, from that information, you can calculate the required rotation.

Quaternions are generally used to interpolate between two rotational 'positions'. So step one is identifying your start and end 'positions', which you don't have yet. Once you have that, you use quaternions to interpolate. It doesn't sound like you have any time-varying aspect here.