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

pixels = W:1024 H:1024

x = from -4.0 to 4.0 W
y = from -4.0 to 4.0 H

t = 2.0
w = 2.0

a = atan2(y, x)
d = length2(x, y)

a = a*3+cos(d*w/10)*50

g = cos(mod(a, PI)*2.0)*0.5 + 0.5
k = smoothstep(0.0, 0.7, d)*g

r = hsv_r(k, k+1, d+1)
g = hsv_g(k, k+1, d+1)
b = hsv_b(k, k+1, d+1)
