#https://www.shadertoy.com/view/ls2yW3

pixels = W:1024 H:1024

x = from -1 to 1 W
y = from -1 to 1 H

ax = x + 0.5
bx = x - 0.5

s = 16.0

r1 = sin(length2(ax, y)*s)
t1 = atan2(y, ax)

r2 = sin(length2(bx, y)*s)
t2 = atan2(y, bx)

a = r1 - r2
b = t1 - t2

r = a*cos(b)
g = a*sin(b)
b = 0
