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

pixels = W:1024 H:1024

x = from -0.5 to 0.5 W
y = from -0.5 to 0.5 H

d = x*x+y*y
x = x/(d*0.4)
y = y/(d*0.4)
x = fract(x)
y = fract(y)
k = max(x - y, y)

r = k
g = k
b = k
