stepseqcore.cpp

void ClapNoteGenerator::process(double sr,
    int samples_to_advance,clap::helpers::EventList& outlist)
{
    // notesendfunc is a thing that deals with actually sending the output note events onwards
    // my code is doing that in the Clap plugin event format, so the details are not
    // super important
    if (mustSendNoteOffs)
    {
        // we were asked to immediately stop producing notes, so just send note offs for everything and bail out
        for (auto& e : sequence)
        {
            notesendfunc(0,CLAP_EVENT_NOTE_OFF,0,e.m_actual_pitch,-1,0.0);
        }
        return;
    }
    int note_gap_samples = (60.0/m_bpm * m_note_gap) * sr;
    
    for (int i=0;i<samples_to_advance;++i)
    {
        if (m_step_time_counter == 0)
        {
            auto& step = sequence[m_sequence_counter];
            int note_dur_samples = (60.0/m_bpm * m_note_gap * step.m_dur_ratio) * sr;
            step.m_count_to_note_off = note_dur_samples;
            int mkey = step.m_pitch+m_global_transpose;
            step.m_actual_pitch = step.m_pitch+m_global_transpose;
            m_cur_note = mkey;
            notesendfunc(i,CLAP_EVENT_NOTE_ON,0,mkey,-1,step.m_velo);
            //DBG("Sent note on at buffer pos " << i << " " << mkey);
            ++m_sequence_counter;
            if (m_sequence_counter == sequence.size())
                m_sequence_counter = 0;
        }
        // obviously pretty inefficient but shall work for now...
        for (int j=0;j<sequence.size();++j)
        {
            auto& step = sequence[j];
            if (step.m_count_to_note_off>0)
            {
                --step.m_count_to_note_off;
                if (step.m_count_to_note_off==0)
                {
                    notesendfunc(i,CLAP_EVENT_NOTE_OFF,0,step.m_actual_pitch,-1,0.0);
                }
            }
        }
        
        ++m_step_time_counter;
        if (m_step_time_counter == note_gap_samples)
            m_step_time_counter = 0;
    }
}