Carla/source/modules/native-plugins/zynaddsubfx/Synth/SUBnote.h

/*
  ZynAddSubFX - a software synthesizer

  SUBnote.h - The subtractive synthesizer
  Copyright (C) 2002-2005 Nasca Octavian Paul
  Author: Nasca Octavian Paul

  This program is free software; you can redistribute it and/or modify
  it under the terms of version 2 of the GNU General Public License
  as published by the Free Software Foundation.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License (version 2 or later) for more details.

  You should have received a copy of the GNU General Public License (version 2)
  along with this program; if not, write to the Free Software Foundation,
  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA

*/

#ifndef SUB_NOTE_H
#define SUB_NOTE_H

#include "SynthNote.h"
#include "../globals.h"
#include "../Params/SUBnoteParameters.h"
#include "../Params/Controller.h"
#include "Envelope.h"
#include "../DSP/Filter.h"

class SUBnote:public SynthNote
{
    public:
        SUBnote(SUBnoteParameters *parameters, Controller *ctl_, float freq,
                float velocity, int portamento_, int midinote, bool besilent);
        ~SUBnote();

        void legatonote(float freq, float velocity, int portamento_,
                        int midinote, bool externcall);

        int noteout(float *outl, float *outr); //note output,return 0 if the note is finished
        void relasekey();
        int finished() const;
    private:

        void setup(float freq,
                   float velocity,
                   int portamento_,
                   int midinote,
                   bool legato = false);
        void computecurrentparameters();
        void initparameters(float freq);
        void KillNote();

        SUBnoteParameters *pars;

        //parameters
        int       stereo;
        int       numstages; //number of stages of filters
        int       numharmonics; //number of harmonics (after the too higher hamonics are removed)
        int       firstnumharmonics; //To keep track of the first note's numharmonics value, useful in legato mode.
        int       start; //how the harmonics start
        float     basefreq;
        float     panning;
        Envelope *AmpEnvelope;
        Envelope *FreqEnvelope;
        Envelope *BandWidthEnvelope;

        Filter *GlobalFilterL, *GlobalFilterR;

        Envelope *GlobalFilterEnvelope;

        //internal values
        ONOFFTYPE NoteEnabled;
        int       firsttick, portamento;
        float     volume, oldamplitude, newamplitude;

        float GlobalFilterCenterPitch; //octaves
        float GlobalFilterFreqTracking;

        struct bpfilter {
            float freq, bw, amp; //filter parameters
            float a1, a2, b0, b2; //filter coefs. b1=0
            float xn1, xn2, yn1, yn2; //filter internal values
        };

        void initfilter(bpfilter &filter,
                        float freq,
                        float bw,
                        float amp,
                        float mag);
        float computerolloff(float freq);
        void computefiltercoefs(bpfilter &filter,
                                float freq,
                                float bw,
                                float gain);
        inline void filter(bpfilter &filter, float *smps);

        bpfilter *lfilter, *rfilter;

        float overtone_rolloff[MAX_SUB_HARMONICS];
        float overtone_freq[MAX_SUB_HARMONICS];

        Controller *ctl;
        int   oldpitchwheel, oldbandwidth;
        float globalfiltercenterq;
};

#endif