A port of https://github.com/ashima/webgl-noise

You can use those noises in your gdscripts using the technique shown here: https://github.com/curly-brace/Godot-Simplex

Consists of:

• worley 2d
• worley with 2x2 window instead of 3x3
• worley 3d
• worley 3d with 2x2x2 window instead of 3x3x3
• perlin 2d
• perlin 3d
• perlin 4d
• simplex 2d
• simplex 3d
• simplex 3d with analytic derivative gradient output
• simplex 4d
• and last is 'psrdnoise' monster with 4:
  • 2-D non-tiling simplex noise with rotating gradients, without the analytical derivative
  • 2-D non-tiling simplex noise with rotating gradients and analytical derivative
  • 2-D tiling simplex noise with rotating gradients, without the analytical derivative
  • 2-D tiling simplex noise with rotating gradients and analytical derivative

Analytical derivatives return vec3 with first element is a vector of the noise value. And 2nd and 3rd are x and y partial derivatives.

You can test any of the shaders by creating a Sprite node, creating new ImageTexture for it (size like 256x256 would be fine), creating new shader material for it and loading desired shader to it. (try simplex3d.tres ^_^ )

All shaders have offset and scale parameters. Set scale to something like 8 to see the noise better. Worley shaders have jitter parameter that with 0 value will output perfect squares.

More info on original repo: https://github.com/ashima/webgl-noise/wiki

godot does not support (currently) in shaders: constants, inline functions, defines, for loops, better swizzling. So code is not as efficient as it could be.