Carla/source/backend/native/zynaddsubfx/Synth/PADnote.cpp

/*
  ZynAddSubFX - a software synthesizer

  pADnote.cpp - The "pad" 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
*/
#include <math.h>
#include "PADnote.h"
#include "../Misc/Config.h"
#include "../DSP/Filter.h"

PADnote::PADnote(PADnoteParameters *parameters,
                 Controller *ctl_,
                 float freq,
                 float velocity,
                 int portamento_,
                 int midinote,
                 bool besilent)
    :SynthNote(freq, velocity, portamento_, midinote, besilent)
{
    pars = parameters;

    ctl = ctl_;
    firsttime = true;
    setup(freq, velocity, portamento_, midinote);
}


void PADnote::setup(float freq,
                    float velocity,
                    int portamento_,
                    int midinote,
                    bool legato)
{
    portamento     = portamento_;
    this->velocity = velocity;
    finished_      = false;


    if(pars->Pfixedfreq == 0)
        basefreq = freq;
    else {
        basefreq = 440.0f;
        int fixedfreqET = pars->PfixedfreqET;
        if(fixedfreqET != 0) { //if the frequency varies according the keyboard note
            float tmp =
                (midinote
                 - 69.0f) / 12.0f
                * (powf(2.0f, (fixedfreqET - 1) / 63.0f) - 1.0f);
            if(fixedfreqET <= 64)
                basefreq *= powf(2.0f, tmp);
            else
                basefreq *= powf(3.0f, tmp);
        }
    }

    firsttime = true;
    released  = false;
    realfreq  = basefreq;
    if(!legato)
        NoteGlobalPar.Detune = getdetune(pars->PDetuneType, pars->PCoarseDetune,
                                         pars->PDetune);


    //find out the closest note
    float logfreq = logf(basefreq * powf(2.0f, NoteGlobalPar.Detune / 1200.0f));
    float mindist = fabs(logfreq - logf(pars->sample[0].basefreq + 0.0001f));
    nsample = 0;
    for(int i = 1; i < PAD_MAX_SAMPLES; ++i) {
        if(pars->sample[i].smp == NULL)
            break;
        float dist = fabs(logfreq - logf(pars->sample[i].basefreq + 0.0001f));

        if(dist < mindist) {
            nsample = i;
            mindist = dist;
        }
    }

    int size = pars->sample[nsample].size;
    if(size == 0)
        size = 1;


    if(!legato) { //not sure
        poshi_l = (int)(RND * (size - 1));
        if(pars->PStereo != 0)
            poshi_r = (poshi_l + size / 2) % size;
        else
            poshi_r = poshi_l;
        poslo = 0.0f;
    }


    if(pars->PPanning == 0)
        NoteGlobalPar.Panning = RND;
    else
        NoteGlobalPar.Panning = pars->PPanning / 128.0f;

    NoteGlobalPar.FilterCenterPitch = pars->GlobalFilter->getfreq() //center freq
                                      + pars->PFilterVelocityScale / 127.0f
                                      * 6.0f                                //velocity sensing
                                      * (VelF(velocity,
                                              pars->
                                              PFilterVelocityScaleFunction) - 1);

    if(!legato) {
        if(pars->PPunchStrength != 0) {
            NoteGlobalPar.Punch.Enabled = 1;
            NoteGlobalPar.Punch.t = 1.0f; //start from 1.0f and to 0.0f
            NoteGlobalPar.Punch.initialvalue =
                ((powf(10, 1.5f * pars->PPunchStrength / 127.0f) - 1.0f)
                 * VelF(velocity,
                        pars->PPunchVelocitySensing));
            float time =
                powf(10, 3.0f * pars->PPunchTime / 127.0f) / 10000.0f;             //0.1f .. 100 ms
            float stretch = powf(440.0f / freq, pars->PPunchStretch / 64.0f);
            NoteGlobalPar.Punch.dt = 1.0f
                                     / (time * synth->samplerate_f * stretch);
        }
        else
            NoteGlobalPar.Punch.Enabled = 0;

        NoteGlobalPar.FreqEnvelope = new Envelope(pars->FreqEnvelope, basefreq);
        NoteGlobalPar.FreqLfo      = new LFO(pars->FreqLfo, basefreq);

        NoteGlobalPar.AmpEnvelope = new Envelope(pars->AmpEnvelope, basefreq);
        NoteGlobalPar.AmpLfo      = new LFO(pars->AmpLfo, basefreq);
    }

    NoteGlobalPar.Volume = 4.0f
                           * powf(0.1f, 3.0f * (1.0f - pars->PVolume / 96.0f))      //-60 dB .. 0 dB
                           * VelF(velocity, pars->PAmpVelocityScaleFunction); //velocity sensing

    NoteGlobalPar.AmpEnvelope->envout_dB(); //discard the first envelope output
    globaloldamplitude = globalnewamplitude = NoteGlobalPar.Volume
                                              * NoteGlobalPar.AmpEnvelope->
                                              envout_dB()
                                              * NoteGlobalPar.AmpLfo->amplfoout();

    if(!legato) {
        NoteGlobalPar.GlobalFilterL = Filter::generate(pars->GlobalFilter);
        NoteGlobalPar.GlobalFilterR = Filter::generate(pars->GlobalFilter);

        NoteGlobalPar.FilterEnvelope = new Envelope(pars->FilterEnvelope,
                                                    basefreq);
        NoteGlobalPar.FilterLfo = new LFO(pars->FilterLfo, basefreq);
    }
    NoteGlobalPar.FilterQ = pars->GlobalFilter->getq();
    NoteGlobalPar.FilterFreqTracking = pars->GlobalFilter->getfreqtracking(
        basefreq);

    if(pars->sample[nsample].smp == NULL) {
        finished_ = true;
        return;
    }
}

void PADnote::legatonote(float freq,
                         float velocity,
                         int portamento_,
                         int midinote,
                         bool externcall)
{
    // Manage legato stuff
    if(legato.update(freq, velocity, portamento_, midinote, externcall))
        return;

    setup(freq, velocity, portamento_, midinote, true);
}


PADnote::~PADnote()
{
    delete (NoteGlobalPar.FreqEnvelope);
    delete (NoteGlobalPar.FreqLfo);
    delete (NoteGlobalPar.AmpEnvelope);
    delete (NoteGlobalPar.AmpLfo);
    delete (NoteGlobalPar.GlobalFilterL);
    delete (NoteGlobalPar.GlobalFilterR);
    delete (NoteGlobalPar.FilterEnvelope);
    delete (NoteGlobalPar.FilterLfo);
}


inline void PADnote::fadein(float *smps)
{
    int zerocrossings = 0;
    for(int i = 1; i < synth->buffersize; ++i)
        if((smps[i - 1] < 0.0f) && (smps[i] > 0.0f))
            zerocrossings++;                                  //this is only the possitive crossings

    float tmp = (synth->buffersize_f - 1.0f) / (zerocrossings + 1) / 3.0f;
    if(tmp < 8.0f)
        tmp = 8.0f;

    int n;
    F2I(tmp, n); //how many samples is the fade-in
    if(n > synth->buffersize)
        n = synth->buffersize;
    for(int i = 0; i < n; ++i) { //fade-in
        float tmp = 0.5f - cosf((float)i / (float) n * PI) * 0.5f;
        smps[i] *= tmp;
    }
}


void PADnote::computecurrentparameters()
{
    float globalpitch, globalfilterpitch;
    globalpitch = 0.01f * (NoteGlobalPar.FreqEnvelope->envout()
                           + NoteGlobalPar.FreqLfo->lfoout()
                           * ctl->modwheel.relmod + NoteGlobalPar.Detune);
    globaloldamplitude = globalnewamplitude;
    globalnewamplitude = NoteGlobalPar.Volume
                         * NoteGlobalPar.AmpEnvelope->envout_dB()
                         * NoteGlobalPar.AmpLfo->amplfoout();

    globalfilterpitch = NoteGlobalPar.FilterEnvelope->envout()
                        + NoteGlobalPar.FilterLfo->lfoout()
                        + NoteGlobalPar.FilterCenterPitch;

    float tmpfilterfreq = globalfilterpitch + ctl->filtercutoff.relfreq
                          + NoteGlobalPar.FilterFreqTracking;

    tmpfilterfreq = Filter::getrealfreq(tmpfilterfreq);

    float globalfilterq = NoteGlobalPar.FilterQ * ctl->filterq.relq;
    NoteGlobalPar.GlobalFilterL->setfreq_and_q(tmpfilterfreq, globalfilterq);
    NoteGlobalPar.GlobalFilterR->setfreq_and_q(tmpfilterfreq, globalfilterq);

    //compute the portamento, if it is used by this note
    float portamentofreqrap = 1.0f;
    if(portamento != 0) { //this voice use portamento
        portamentofreqrap = ctl->portamento.freqrap;
        if(ctl->portamento.used == 0) //the portamento has finished
            portamento = 0;  //this note is no longer "portamented"
        ;
    }

    realfreq = basefreq * portamentofreqrap
               * powf(2.0f, globalpitch / 12.0f) * ctl->pitchwheel.relfreq;
}


int PADnote::Compute_Linear(float *outl,
                            float *outr,
                            int freqhi,
                            float freqlo)
{
    float *smps = pars->sample[nsample].smp;
    if(smps == NULL) {
        finished_ = true;
        return 1;
    }
    int size = pars->sample[nsample].size;
    for(int i = 0; i < synth->buffersize; ++i) {
        poshi_l += freqhi;
        poshi_r += freqhi;
        poslo   += freqlo;
        if(poslo >= 1.0f) {
            poshi_l += 1;
            poshi_r += 1;
            poslo   -= 1.0f;
        }
        if(poshi_l >= size)
            poshi_l %= size;
        if(poshi_r >= size)
            poshi_r %= size;

        outl[i] = smps[poshi_l] * (1.0f - poslo) + smps[poshi_l + 1] * poslo;
        outr[i] = smps[poshi_r] * (1.0f - poslo) + smps[poshi_r + 1] * poslo;
    }
    return 1;
}
int PADnote::Compute_Cubic(float *outl,
                           float *outr,
                           int freqhi,
                           float freqlo)
{
    float *smps = pars->sample[nsample].smp;
    if(smps == NULL) {
        finished_ = true;
        return 1;
    }
    int   size = pars->sample[nsample].size;
    float xm1, x0, x1, x2, a, b, c;
    for(int i = 0; i < synth->buffersize; ++i) {
        poshi_l += freqhi;
        poshi_r += freqhi;
        poslo   += freqlo;
        if(poslo >= 1.0f) {
            poshi_l += 1;
            poshi_r += 1;
            poslo   -= 1.0f;
        }
        if(poshi_l >= size)
            poshi_l %= size;
        if(poshi_r >= size)
            poshi_r %= size;


        //left
        xm1     = smps[poshi_l];
        x0      = smps[poshi_l + 1];
        x1      = smps[poshi_l + 2];
        x2      = smps[poshi_l + 3];
        a       = (3.0f * (x0 - x1) - xm1 + x2) * 0.5f;
        b       = 2.0f * x1 + xm1 - (5.0f * x0 + x2) * 0.5f;
        c       = (x1 - xm1) * 0.5f;
        outl[i] = (((a * poslo) + b) * poslo + c) * poslo + x0;
        //right
        xm1     = smps[poshi_r];
        x0      = smps[poshi_r + 1];
        x1      = smps[poshi_r + 2];
        x2      = smps[poshi_r + 3];
        a       = (3.0f * (x0 - x1) - xm1 + x2) * 0.5f;
        b       = 2.0f * x1 + xm1 - (5.0f * x0 + x2) * 0.5f;
        c       = (x1 - xm1) * 0.5f;
        outr[i] = (((a * poslo) + b) * poslo + c) * poslo + x0;
    }
    return 1;
}


int PADnote::noteout(float *outl, float *outr)
{
    computecurrentparameters();
    float *smps = pars->sample[nsample].smp;
    if(smps == NULL) {
        for(int i = 0; i < synth->buffersize; ++i) {
            outl[i] = 0.0f;
            outr[i] = 0.0f;
        }
        return 1;
    }
    float smpfreq = pars->sample[nsample].basefreq;


    float freqrap = realfreq / smpfreq;
    int   freqhi  = (int) (floor(freqrap));
    float freqlo  = freqrap - floor(freqrap);


    if(config.cfg.Interpolation)
        Compute_Cubic(outl, outr, freqhi, freqlo);
    else
        Compute_Linear(outl, outr, freqhi, freqlo);


    if(firsttime) {
        fadein(outl);
        fadein(outr);
        firsttime = false;
    }

    NoteGlobalPar.GlobalFilterL->filterout(outl);
    NoteGlobalPar.GlobalFilterR->filterout(outr);

    //Apply the punch
    if(NoteGlobalPar.Punch.Enabled != 0)
        for(int i = 0; i < synth->buffersize; ++i) {
            float punchamp = NoteGlobalPar.Punch.initialvalue
                             * NoteGlobalPar.Punch.t + 1.0f;
            outl[i] *= punchamp;
            outr[i] *= punchamp;
            NoteGlobalPar.Punch.t -= NoteGlobalPar.Punch.dt;
            if(NoteGlobalPar.Punch.t < 0.0f) {
                NoteGlobalPar.Punch.Enabled = 0;
                break;
            }
        }

    if(ABOVE_AMPLITUDE_THRESHOLD(globaloldamplitude, globalnewamplitude))
        // Amplitude Interpolation
        for(int i = 0; i < synth->buffersize; ++i) {
            float tmpvol = INTERPOLATE_AMPLITUDE(globaloldamplitude,
                                                 globalnewamplitude,
                                                 i,
                                                 synth->buffersize);
            outl[i] *= tmpvol * NoteGlobalPar.Panning;
            outr[i] *= tmpvol * (1.0f - NoteGlobalPar.Panning);
        }
    else
        for(int i = 0; i < synth->buffersize; ++i) {
            outl[i] *= globalnewamplitude * NoteGlobalPar.Panning;
            outr[i] *= globalnewamplitude * (1.0f - NoteGlobalPar.Panning);
        }


    // Apply legato-specific sound signal modifications
    legato.apply(*this, outl, outr);

    // Check if the global amplitude is finished.
    // If it does, disable the note
    if(NoteGlobalPar.AmpEnvelope->finished() != 0) {
        for(int i = 0; i < synth->buffersize; ++i) { //fade-out
            float tmp = 1.0f - (float)i / synth->buffersize_f;
            outl[i] *= tmp;
            outr[i] *= tmp;
        }
        finished_ = 1;
    }

    return 1;
}

int PADnote::finished() const
{
    return finished_;
}

void PADnote::relasekey()
{
    NoteGlobalPar.FreqEnvelope->relasekey();
    NoteGlobalPar.FilterEnvelope->relasekey();
    NoteGlobalPar.AmpEnvelope->relasekey();
}