pixels = W:1024 H:1024

x = from 0 to 1 W
y = from 0 to 1 H

f = 20
k = xor_value_fbm2(x*f, y*f)
k = xor_value_fbm2(x*f + 4*y*k, y*f - 4*y*k)
k = xor_value_fbm2(x*f - 4*y*k, y*f + 4*y*k)


r = k*0.5 + 0.5
g = r
b = r
