#https://www.shadertoy.com/view/XtlcRs

pixels = W:1024 H:1024

x = from 2 to 4 H
y = from -2 to 2 W

a2b2 = x*x+y*y

t1 = pow(a2b2,  x/2.0)*exp(-y*atan2(y, x))
t2 = x*atan2(y, x)+0.5*y*log(a2b2)
cx = t1*cos(t2)
cy = t1*sin(t2)

r = (sin(cx)+1.0)/2.0
g = (sin(cy)+1.0)/2.0
b = (sin(length2(cx, cy))+1.0)/2.0
