Summary

This PR improves the noise() function in p5.strands by aligning it more closely with core p5.js functionality and improving its visual quality through fractal noise.

What's Included

• noise(x, y) is now supported in addition to noise([x, y])
• Added 4-octave fractal noise implementation in GLSL
• noiseGLSL.glsl injected into both vertex and fragment stages
• Falls back to the original p5.js noise() function outside of strands
• MIT license attribution added for the noise basis function

Technical Notes

• The fn.noise() wrapper checks for 2 arguments and wraps them using vec2(...) to allow for noise(x, y) syntax.
• The GLSL file noiseGLSL.glsl defines baseNoise() and a new noise() function using a fixed 4-octave loop:

  for (int i = 0; i < 4; i++) {
    result += amplitude * baseNoise(st * frequency);
    frequency *= 2.0;
    amplitude *= 0.5;
  }
  
  

PR Checklist

• npm run lint passes
• Inline reference is included / updated
• Unit tests are included / updated