Noise 4

noise.cpp

float perlin2d(const float x, const float y,
               const int octaves, const float persistence) {
  float total = 0.0f;

  for (int i = 0; i <= (octaves - 1); i ++) {
    float frequency = powf(2, i);
    float amplitude = powf(persistence, i);

    total = total + interpolateNoise(x * frequency, y * frequency) * amplitude;
  }

  return total;
}