#https://www.shadertoy.com/view/4sKXzy

pixels = W:1024 H:1024

x = from 0 to 10 W
y = from 0 to 10 H

x = abs(fract(x) - 0.5)
y = abs(fract(y) - 0.5)

k = max(max(x, y), min(x, y)*2)

r = k
g = k
b = k
