Waveform.cpp

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/*******************************************************************************
 * Waveform.cpp (JackFX) 
 ******************************************************************************/

#include "Waveform.h"

Waveform::Waveform(Waveform::WaveType t) : 
    ISoundSource(), 
    m_wavetype(t),
    m_phase(0),
    m_freq(1),
    m_offset(0),
    m_amplitude(1)
{
}

Waveform::~Waveform()
{
}

void Waveform::Process(jack_nframes_t count)
{
    ISoundSource::Process(count);

    float samplelength = 4.0f / jack_get_sample_rate(JackClient::GetSingleton()->GetClient());
    for (unsigned int x = 0; x < count; ++x) {
        GetPipe().GetSamples()[x] = (
                CalcWave(
                        fmod(m_time + m_phase, 1.0f)
                    )
                + m_offset)
            * m_amplitude;
        m_time += samplelength * m_freq;
        while (m_time > 1) {
            m_time -= 1;
        }
    }
}

float Waveform::CalcWave(float t)
{
    //cout << "Waveform for time position " << t << endl;
    float ret;
    switch (m_wavetype) {
        case W_SIN:
            ret = sin(t * 6.283);
            break;
        case W_TRI:
            ret = abs(0.5 - t);
            break;
        case W_SAW:
            ret = t;
            break;
        case W_RSAW:
            ret = 1 - t;
            break;
        case W_SQU:
            ret = t > 0.5;
            break;
        default:
            ret = 0;
    }
    return ret;
}