#include "NoiseOscillator.h"

namespace serum
{

void NoiseOscillator::reset()
{
    pinkB0 = pinkB1 = pinkB2 = 0.0f;
}

void NoiseOscillator::noteOn (juce::uint32 seed)
{
    rng.setSeed (seed);
}

void NoiseOscillator::processAdd (int type, float level, float& out) noexcept
{
    if (level <= 0.0f)
        return;

    const float white = rng.nextFloat() * 2.0f - 1.0f;

    float s = white;
    if (type == (int) NoiseType::Pink)
    {
        // Paul Kellet's economy pink-noise filter.
        pinkB0 = 0.99765f * pinkB0 + white * 0.0990460f;
        pinkB1 = 0.96300f * pinkB1 + white * 0.2965164f;
        pinkB2 = 0.57000f * pinkB2 + white * 1.0526913f;
        s = pinkB0 + pinkB1 + pinkB2 + white * 0.1848f;
    }

    out += s * level;
}

} // namespace serum