I've worked it out on paper, both for functionally known gamma functions (optionally piecewise defined) and for arbitrary monotonically increasing gamma arrays

I've worked it out on paper, both for functionally known gamma functions (optionally piecewise defined) and for arbitrary monotonically increasing gamma arrays (where naive linear interpolation is used for values of c that do not correspond to integral k's). I will try to write it out in LaTeX, and will link when finished. Sadly the shadertoy site doesn't work on my smarthone (it complains that uint's are not available before mobile GLSL 3.0, I tried modifying them all to normal int's, but then got stuck on the hash function through which I assume you generate pseudo random numbers.