Variation:
The orientation of the torus pattern is random.
Ratio of black and white stripe widths.
Number of colors: 6.

Made with GLSL and p5.js

Attention!: It may not work properly on some mobile devices that do not support
high precision float(highp).

Key Input:
s: screen capture (.png)
f: Fix the viewpoint in the center. ON/OFF
g: Apply gamma correction. ON/OFF