noiseWave

//! requires hash1D
fn noiseWave(x: f32, frequency: f32, amplitude: f32, seed: f32) -> f32 {
  // Create interpolated noise
  let t = x * frequency;
  let floorT = floor(t);
  let fractT = fract(t);
  
  // Get four noise values and interpolate between them
  let n0 = hash1D(floorT + seed);
  let n1 = hash1D(floorT + 1.0 + seed);
  
  // Smooth interpolation
  let u = fractT * fractT * (3.0 - 2.0 * fractT); // Smoothstep
  
  return mix(n0, n1, u) * amplitude;
}