Radial Gradient?

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JA2

I'm trying to make a radial gradient to use as a texture for my game character shadow. I want to be able to pass a number to a function to make the gradient using the number of given colours. For example CreateGradient (5) would make a gradient with 5 steps, CreateGradient (100) would make a gradient with 100 etc

Only needs to be black and white. And the gradient needs to always fill the whole 256 x 256 texture with 2d drawing commands only. Something like this:

Could somebody please help me out?

Thanks