pixels = W:1024 H:1024

x = from -2 to 2 W
y = from -2 to 2 H

ax = xor_value_fbm2(x, y)
ay = xor_value_fbm2(x + 1, y + 1)

bx = xor_value_fbm2(x + 4*ax, y + 4*ay)
by = xor_value_fbm2(x + 5*ax, y + 5*ay)

cx = xor_value_fbm2(x + 7*bx + 10.7, y + 7*by + 0.2)
cy = xor_value_fbm2(x + 3.9*bx + 0.3, y + 3.9*by + 12.8)

r = xor_value_fbm2(x +ax + bx + cx, y +ay + by + cy)*0.5 + 0.5
g = r
b = r
