Texture colour wrapping

Good Afternoon,

I am new to OpenGL and I was wondering if somebody could tell me if what I
am intending to do is feasible with PyOpenGL.
Here is my problem,

I have data contained in a 2D numpy array of type float. The values in the
array are phase data in polar coordinates. From the array, I am creating a
texture which I mapped using quad strips in order to get the polar to
cartesian conversion.

Once this mapping is done I would like to "wrap" the phase/colour value.
For example, I could have phase value ranging from 0.0 to 6.2 and I want to
ignore the integer par of the value so value(1.3) = value(2.3) =value(3.3)
etc...

I can not do the "colour wrapping" before the mapping (I've tried). The
results is not right an limited by the resolution of the texture.

I was wondering if it would be possible to do such a wrapping, I have been
thinking maybe a lookup table or a shader could be used... This is where I
would appreciate getting some advices.

Thanks in advance.

Regards

Brice

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