#include "SubOscillator.h"

namespace serum
{

void SubOscillator::noteOn()
{
    phase = 0.0;
}

void SubOscillator::processAdd (double freqHz, int shape, float level, float& out) noexcept
{
    if (level <= 0.0f || freqHz <= 0.0)
        return;

    // The octave shift is baked into freqHz by the voice; here we just phase-accumulate.
    const double inc = juce::MathConstants<double>::twoPi * freqHz / sr;
    phase += inc;
    phase -= std::floor (phase * (1.0 / juce::MathConstants<double>::twoPi)) * juce::MathConstants<double>::twoPi;

    float s = 0.0f;
    if (shape == (int) SubShape::Triangle)
    {
        const float p = (float) (phase * (1.0 / juce::MathConstants<double>::twoPi));
        s = 1.0f - 4.0f * std::abs (p - 0.5f);
    }
    else
    {
        s = (float) std::sin (phase);
    }

    out += s * level;
}

} // namespace serum