furnace/src/engine/platform/vb.cpp

/**
 * Furnace Tracker - multi-system chiptune tracker
 * Copyright (C) 2021-2022 tildearrow and contributors
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#include "vb.h"
#include "../engine.h"
#include <math.h>

//#define rWrite(a,v) pendingWrites[a]=v;
#define rWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define chWrite(c,a,v) rWrite(0x400+((c)<<6)+((a)<<2),v);

#define CHIP_DIVIDER 16

const char* regCheatSheetVB[]={
  "Wave0", "000",
  "Wave1", "080",
  "Wave2", "100",
  "Wave3", "180",
  "Wave4", "200",
  "ModTable", "280",

  "S0INT", "400",
  "S0LRV", "404",
  "S0FQL", "408",
  "S0FQH", "40C",
  "S0EV0", "410",
  "S0EV1", "414",
  "S0RAM", "418",

  "S1INT", "440",
  "S1LRV", "444",
  "S1FQL", "448",
  "S1FQH", "44C",
  "S1EV0", "450",
  "S1EV1", "454",
  "S1RAM", "458",

  "S2INT", "480",
  "S2LRV", "484",
  "S2FQL", "488",
  "S2FQH", "48C",
  "S2EV0", "480",
  "S2EV1", "484",
  "S2RAM", "488",

  "S3INT", "4C0",
  "S3LRV", "4C4",
  "S3FQL", "4C8",
  "S3FQH", "4CC",
  "S3EV0", "4C0",
  "S3EV1", "4C4",
  "S3RAM", "4C8",

  "S4INT", "500",
  "S4LRV", "504",
  "S4FQL", "508",
  "S4FQH", "50C",
  "S4EV0", "510",
  "S4EV1", "514",
  "S4RAM", "518",

  "S4SWP", "51C",

  "S5INT", "540",
  "S5LRV", "544",
  "S5FQL", "548",
  "S5FQH", "54C",
  "S5EV0", "550",
  "S5EV1", "554",
  "S5RAM", "558",
  NULL
};

const char** DivPlatformVB::getRegisterSheet() {
  return regCheatSheetVB;
}

void DivPlatformVB::acquire(short* bufL, short* bufR, size_t start, size_t len) {
  for (size_t h=start; h<start+len; h++) {
    // PCM part
    /*
    for (int i=0; i<6; i++) {
      if (chan[i].pcm && chan[i].dacSample!=-1) {
        chan[i].dacPeriod+=chan[i].dacRate;
        if (chan[i].dacPeriod>rate) {
          DivSample* s=parent->getSample(chan[i].dacSample);
          if (s->samples<=0) {
            chan[i].dacSample=-1;
            continue;
          }
          chWrite(i,0x07,0);
          signed char dacData=((signed char)((unsigned char)s->data8[chan[i].dacPos]^0x80))>>3;
          chan[i].dacOut=CLAMP(dacData,-16,15);
          if (!isMuted[i]) {
            chWrite(i,0x04,parent->song.disableSampleMacro?0xdf:(0xc0|chan[i].outVol));
            chWrite(i,0x06,chan[i].dacOut&0x1f);
          } else {
            chWrite(i,0x04,0xc0);
            chWrite(i,0x06,0x10);
          }
          chan[i].dacPos++;
          if (s->isLoopable() && chan[i].dacPos>=(unsigned int)s->loopEnd) {
            chan[i].dacPos=s->loopStart;
          } else if (chan[i].dacPos>=s->samples) {
            chan[i].dacSample=-1;
          }
          chan[i].dacPeriod-=rate;
        }
      }
    }
    */
  
    // VB part
    cycles=0;
    while (!writes.empty()) {
      QueuedWrite w=writes.front();
      vb->Write(cycles,w.addr,w.val);
      regPool[w.addr]=w.val;
      //cycles+=2;
      writes.pop();
    }
    vb->EndFrame(16);

    tempL=0;
    tempR=0;
    for (int i=0; i<6; i++) {
      oscBuf[i]->data[oscBuf[i]->needle++]=(vb->last_output[i][0]+vb->last_output[i][1])*8;
      tempL+=vb->last_output[i][0];
      tempR+=vb->last_output[i][1];
    }

    if (tempL<-32768) tempL=-32768;
    if (tempL>32767) tempL=32767;
    if (tempR<-32768) tempR=-32768;
    if (tempR>32767) tempR=32767;
    
    bufL[h]=tempL;
    bufR[h]=tempR;
  }
}

void DivPlatformVB::updateWave(int ch) {
  if (ch>=5) return;

  if (chan[ch].pcm) {
    chan[ch].deferredWaveUpdate=true;
    return;
  }
  for (int i=0; i<32; i++) {
    rWrite((ch<<7)+(i<<2),chan[ch].ws.output[i]);
    //chWrite(ch,0x06,chan[ch].ws.output[(i+chan[ch].antiClickWavePos)&31]);
  }
  chan[ch].antiClickWavePos&=31;
  if (chan[ch].active) {
    //chWrite(ch,0x04,0x80|chan[ch].outVol);
  }
  if (chan[ch].deferredWaveUpdate) {
    chan[ch].deferredWaveUpdate=false;
  }
}

// TODO: in octave 6 the noise table changes to a tonal one
static unsigned char noiseFreq[12]={
  4,13,15,18,21,23,25,27,29,31,0,2  
};

void DivPlatformVB::tick(bool sysTick) {
  for (int i=0; i<6; i++) {
    // anti-click
    if (antiClickEnabled && sysTick && chan[i].freq>0) {
      chan[i].antiClickPeriodCount+=(chipClock/MAX(parent->getCurHz(),1.0f));
      chan[i].antiClickWavePos+=chan[i].antiClickPeriodCount/chan[i].freq;
      chan[i].antiClickPeriodCount%=chan[i].freq;
    }

    chan[i].std.next();
    if (chan[i].std.vol.had) {
      chan[i].outVol=VOL_SCALE_LINEAR(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
      if (chan[i].furnaceDac && chan[i].pcm) {
        // ignore for now
      } else {
        chWrite(i,0x04,chan[i].outVol<<4);
      }
    }
    if (chan[i].std.duty.had && i>=4) {
      chan[i].noise=chan[i].std.duty.val;
      chan[i].freqChanged=true;
      int noiseSeek=chan[i].note;
      if (noiseSeek<0) noiseSeek=0;
      chWrite(i,0x07,chan[i].noise?(0x80|(parent->song.properNoiseLayout?(noiseSeek&31):noiseFreq[noiseSeek%12])):0);
    }
    if (chan[i].std.arp.had) {
      if (!chan[i].inPorta) {
        int noiseSeek=parent->calcArp(chan[i].note,chan[i].std.arp.val);
        chan[i].baseFreq=NOTE_PERIODIC(noiseSeek);
        if (noiseSeek<0) noiseSeek=0;
        chWrite(i,0x07,chan[i].noise?(0x80|(parent->song.properNoiseLayout?(noiseSeek&31):noiseFreq[noiseSeek%12])):0);
      }
      chan[i].freqChanged=true;
    }
    if (chan[i].std.wave.had && !chan[i].pcm) {
      if (chan[i].wave!=chan[i].std.wave.val || chan[i].ws.activeChanged()) {
        chan[i].wave=chan[i].std.wave.val;
        chan[i].ws.changeWave1(chan[i].wave);
        if (!chan[i].keyOff) chan[i].keyOn=true;
      }
    }
    if (chan[i].std.panL.had) {
      chan[i].pan&=0x0f;
      chan[i].pan|=(chan[i].std.panL.val&15)<<4;
    }
    if (chan[i].std.panR.had) {
      chan[i].pan&=0xf0;
      chan[i].pan|=chan[i].std.panR.val&15;
    }
    if (chan[i].std.panL.had || chan[i].std.panR.had) {
      chWrite(i,0x01,isMuted[i]?0:chan[i].pan);
    }
    if (chan[i].std.pitch.had) {
      if (chan[i].std.pitch.mode) {
        chan[i].pitch2+=chan[i].std.pitch.val;
        CLAMP_VAR(chan[i].pitch2,-32768,32767);
      } else {
        chan[i].pitch2=chan[i].std.pitch.val;
      }
      chan[i].freqChanged=true;
    }
    if (chan[i].std.phaseReset.had && chan[i].std.phaseReset.val==1) {
      if (chan[i].furnaceDac && chan[i].pcm) {
        if (chan[i].active && chan[i].dacSample>=0 && chan[i].dacSample<parent->song.sampleLen) {
          chan[i].dacPos=0;
          chan[i].dacPeriod=0;
          //chWrite(i,0x04,parent->song.disableSampleMacro?0xdf:(0xc0|chan[i].vol));
          addWrite(0xffff0000+(i<<8),chan[i].dacSample);
          chan[i].keyOn=true;
        }
      }
      chan[i].antiClickWavePos=0;
      chan[i].antiClickPeriodCount=0;
    }
    if (chan[i].active) {
      if (chan[i].ws.tick() || (chan[i].std.phaseReset.had && chan[i].std.phaseReset.val==1) || chan[i].deferredWaveUpdate) {
        updateWave(i);
      }
    }
    if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
      //DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_PCE);
      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
      if (chan[i].furnaceDac && chan[i].pcm) {
        double off=1.0;
        if (chan[i].dacSample>=0 && chan[i].dacSample<parent->song.sampleLen) {
          DivSample* s=parent->getSample(chan[i].dacSample);
          if (s->centerRate<1) {
            off=1.0;
          } else {
            off=8363.0/(double)s->centerRate;
          }
        }
        chan[i].dacRate=((double)chipClock/2)/MAX(1,off*chan[i].freq);
        if (dumpWrites) addWrite(0xffff0001+(i<<8),chan[i].dacRate);
      }
      if (chan[i].freq<1) chan[i].freq=1;
      if (chan[i].freq>2047) chan[i].freq=2047;
      chan[i].freq=2048-chan[i].freq;
      chWrite(i,0x02,chan[i].freq&0xff);
      chWrite(i,0x03,chan[i].freq>>8);
      if (chan[i].keyOn) {
      }
      if (chan[i].keyOff) {
        chWrite(i,0x04,0);
      }
      if (chan[i].keyOn) chan[i].keyOn=false;
      if (chan[i].keyOff) chan[i].keyOff=false;
      chan[i].freqChanged=false;
    }
  }
}

int DivPlatformVB::dispatch(DivCommand c) {
  switch (c.cmd) {
    case DIV_CMD_NOTE_ON: {
      DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_PCE);
      chan[c.chan].macroVolMul=ins->type==DIV_INS_AMIGA?64:31;
      if (ins->type==DIV_INS_AMIGA || ins->amiga.useSample) {
        chan[c.chan].pcm=true;
      } else if (chan[c.chan].furnaceDac) {
        chan[c.chan].pcm=false;
      }
      if (chan[c.chan].pcm) {
        if (ins->type==DIV_INS_AMIGA || ins->amiga.useSample) {
          chan[c.chan].furnaceDac=true;
          if (skipRegisterWrites) break;
          chan[c.chan].dacSample=ins->amiga.getSample(c.value);
          if (chan[c.chan].dacSample<0 || chan[c.chan].dacSample>=parent->song.sampleLen) {
            chan[c.chan].dacSample=-1;
            if (dumpWrites) addWrite(0xffff0002+(c.chan<<8),0);
            break;
          } else {
             if (dumpWrites) {
               //chWrite(c.chan,0x04,parent->song.disableSampleMacro?0xdf:(0xc0|chan[c.chan].vol));
               addWrite(0xffff0000+(c.chan<<8),chan[c.chan].dacSample);
             }
          }
          chan[c.chan].dacPos=0;
          chan[c.chan].dacPeriod=0;
          if (c.value!=DIV_NOTE_NULL) {
            chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
            chan[c.chan].freqChanged=true;
            chan[c.chan].note=c.value;
          }
          chan[c.chan].active=true;
          chan[c.chan].macroInit(ins);
          if (!parent->song.brokenOutVol && !chan[c.chan].std.vol.will) {
            chan[c.chan].outVol=chan[c.chan].vol;
          }
          //chan[c.chan].keyOn=true;
        } else {
          chan[c.chan].furnaceDac=false;
          if (skipRegisterWrites) break;
          if (c.value!=DIV_NOTE_NULL) {
            chan[c.chan].note=c.value;
          }
          chan[c.chan].dacSample=12*sampleBank+chan[c.chan].note%12;
          if (chan[c.chan].dacSample>=parent->song.sampleLen) {
            chan[c.chan].dacSample=-1;
            if (dumpWrites) addWrite(0xffff0002+(c.chan<<8),0);
            break;
          } else {
            if (dumpWrites) addWrite(0xffff0000+(c.chan<<8),chan[c.chan].dacSample);
          }
          chan[c.chan].dacPos=0;
          chan[c.chan].dacPeriod=0;
          chan[c.chan].dacRate=parent->getSample(chan[c.chan].dacSample)->rate;
          if (dumpWrites) {
            //chWrite(c.chan,0x04,parent->song.disableSampleMacro?0xdf:(0xc0|chan[c.chan].vol));
            addWrite(0xffff0001+(c.chan<<8),chan[c.chan].dacRate);
          }
        }
        break;
      }
      if (c.value!=DIV_NOTE_NULL) {
        chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
        chan[c.chan].freqChanged=true;
        chan[c.chan].note=c.value;
      }
      chan[c.chan].active=true;
      chan[c.chan].keyOn=true;
      chan[c.chan].macroInit(ins);
      if (!parent->song.brokenOutVol && !chan[c.chan].std.vol.will) {
        chan[c.chan].outVol=chan[c.chan].vol;
      }
      if (chan[c.chan].wave<0) {
        chan[c.chan].wave=0;
        chan[c.chan].ws.changeWave1(chan[c.chan].wave);
      }
      chan[c.chan].ws.init(ins,32,63,chan[c.chan].insChanged);
      chan[c.chan].insChanged=false;
      break;
    }
    case DIV_CMD_NOTE_OFF:
      chan[c.chan].dacSample=-1;
      if (dumpWrites) addWrite(0xffff0002+(c.chan<<8),0);
      chan[c.chan].pcm=false;
      chan[c.chan].active=false;
      chan[c.chan].keyOff=true;
      chan[c.chan].macroInit(NULL);
      break;
    case DIV_CMD_NOTE_OFF_ENV:
    case DIV_CMD_ENV_RELEASE:
      chan[c.chan].std.release();
      break;
    case DIV_CMD_INSTRUMENT:
      if (chan[c.chan].ins!=c.value || c.value2==1) {
        chan[c.chan].ins=c.value;
        chan[c.chan].insChanged=true;
      }
      break;
    case DIV_CMD_VOLUME:
      if (chan[c.chan].vol!=c.value) {
        chan[c.chan].vol=c.value;
        if (!chan[c.chan].std.vol.has) {
          chan[c.chan].outVol=c.value;
          if (chan[c.chan].active && !chan[c.chan].pcm) {
            chWrite(c.chan,0x04,chan[c.chan].outVol<<4);
          }
        }
      }
      break;
    case DIV_CMD_GET_VOLUME:
      if (chan[c.chan].std.vol.has) {
        return chan[c.chan].vol;
      }
      return chan[c.chan].outVol;
      break;
    case DIV_CMD_PITCH:
      chan[c.chan].pitch=c.value;
      chan[c.chan].freqChanged=true;
      break;
    case DIV_CMD_WAVE:
      chan[c.chan].wave=c.value;
      chan[c.chan].ws.changeWave1(chan[c.chan].wave);
      chan[c.chan].keyOn=true;
      break;
    case DIV_CMD_PCE_LFO_MODE:
      if (c.value==0) {
        lfoMode=0;
      } else {
        lfoMode=c.value;
      }
      rWrite(0x08,lfoSpeed);
      rWrite(0x09,lfoMode);
      break;
    case DIV_CMD_PCE_LFO_SPEED:
      lfoSpeed=255-c.value;
      rWrite(0x08,lfoSpeed);
      rWrite(0x09,lfoMode);
      break;
    case DIV_CMD_NOTE_PORTA: {
      int destFreq=NOTE_PERIODIC(c.value2);
      bool return2=false;
      if (destFreq>chan[c.chan].baseFreq) {
        chan[c.chan].baseFreq+=c.value;
        if (chan[c.chan].baseFreq>=destFreq) {
          chan[c.chan].baseFreq=destFreq;
          return2=true;
        }
      } else {
        chan[c.chan].baseFreq-=c.value;
        if (chan[c.chan].baseFreq<=destFreq) {
          chan[c.chan].baseFreq=destFreq;
          return2=true;
        }
      }
      chan[c.chan].freqChanged=true;
      if (return2) {
        chan[c.chan].inPorta=false;
        return 2;
      }
      break;
    }
    case DIV_CMD_STD_NOISE_MODE:
      chan[c.chan].noise=c.value;
      chWrite(c.chan,0x07,chan[c.chan].noise?(0x80|chan[c.chan].note):0);
      break;
    case DIV_CMD_SAMPLE_MODE:
      chan[c.chan].pcm=c.value;
      break;
    case DIV_CMD_SAMPLE_BANK:
      sampleBank=c.value;
      if (sampleBank>(parent->song.sample.size()/12)) {
        sampleBank=parent->song.sample.size()/12;
      }
      break;
    case DIV_CMD_PANNING: {
      chan[c.chan].pan=(c.value&0xf0)|(c.value2>>4);
      chWrite(c.chan,0x01,isMuted[c.chan]?0:chan[c.chan].pan);
      break;
    }
    case DIV_CMD_LEGATO:
      chan[c.chan].baseFreq=NOTE_PERIODIC(c.value+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(chan[c.chan].std.arp.val):(0)));
      chan[c.chan].freqChanged=true;
      chan[c.chan].note=c.value;
      break;
    case DIV_CMD_PRE_PORTA:
      if (chan[c.chan].active && c.value2) {
        if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_PCE));
      }
      if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will) chan[c.chan].baseFreq=NOTE_PERIODIC(chan[c.chan].note);
      chan[c.chan].inPorta=c.value;
      break;
    case DIV_CMD_GET_VOLMAX:
      return 15;
      break;
    case DIV_ALWAYS_SET_VOLUME:
      return 1;
      break;
    default:
      break;
  }
  return 1;
}

void DivPlatformVB::muteChannel(int ch, bool mute) {
  isMuted[ch]=mute;
  chWrite(ch,0x01,isMuted[ch]?0:chan[ch].pan);
  if (!isMuted[ch] && (chan[ch].pcm && chan[ch].dacSample!=-1)) {
    //chWrite(ch,0x04,parent->song.disableSampleMacro?0xdf:(0xc0|chan[ch].outVol));
    //chWrite(ch,0x06,chan[ch].dacOut&0x1f);
  }
}

void DivPlatformVB::forceIns() {
  for (int i=0; i<6; i++) {
    chan[i].insChanged=true;
    chan[i].freqChanged=true;
    updateWave(i);
    chWrite(i,0x01,isMuted[i]?0:chan[i].pan);
  }
}

void* DivPlatformVB::getChanState(int ch) {
  return &chan[ch];
}

DivMacroInt* DivPlatformVB::getChanMacroInt(int ch) {
  return &chan[ch].std;
}

DivDispatchOscBuffer* DivPlatformVB::getOscBuffer(int ch) {
  return oscBuf[ch];
}

unsigned char* DivPlatformVB::getRegisterPool() {
  return regPool;
}

int DivPlatformVB::getRegisterPoolSize() {
  return 0x600;
}

int DivPlatformVB::getRegisterPoolDepth() {
  return 8;
}

void DivPlatformVB::reset() {
  while (!writes.empty()) writes.pop();
  memset(regPool,0,0x600);
  for (int i=0; i<6; i++) {
    chan[i]=DivPlatformVB::Channel();
    chan[i].std.setEngine(parent);
    chan[i].ws.setEngine(parent);
    chan[i].ws.init(NULL,32,63,false);
  }
  if (dumpWrites) {
    addWrite(0xffffffff,0);
  }
  vb->Power();
  lastPan=0xff;
  tempL=0;
  tempR=0;
  cycles=0;
  curChan=-1;
  sampleBank=0;
  lfoMode=0;
  lfoSpeed=255;
  // set per-channel initial values
  for (int i=0; i<6; i++) {
    chWrite(i,0x01,isMuted[i]?0:chan[i].pan);
    chWrite(i,0x05,0x00);
    chWrite(i,0x00,0x80);
    chWrite(i,0x06,i);
  }
  delay=500;
}

bool DivPlatformVB::isStereo() {
  return true;
}

bool DivPlatformVB::keyOffAffectsArp(int ch) {
  return true;
}

float DivPlatformVB::getPostAmp() {
  return 6.0f;
}

void DivPlatformVB::notifyWaveChange(int wave) {
  for (int i=0; i<6; i++) {
    if (chan[i].wave==wave) {
      chan[i].ws.changeWave1(wave);
      updateWave(i);
    }
  }
}

void DivPlatformVB::notifyInsDeletion(void* ins) {
  for (int i=0; i<6; i++) {
    chan[i].std.notifyInsDeletion((DivInstrument*)ins);
  }
}

void DivPlatformVB::setFlags(const DivConfig& flags) {
  chipClock=5000000.0;
  antiClickEnabled=!flags.getBool("noAntiClick",false);
  rate=chipClock/16;
  for (int i=0; i<6; i++) {
    oscBuf[i]->rate=rate;
  }

  if (vb!=NULL) {
    delete vb;
    vb=NULL;
  }
  vb=new VSU;
}

void DivPlatformVB::poke(unsigned int addr, unsigned short val) {
  rWrite(addr,val);
}

void DivPlatformVB::poke(std::vector<DivRegWrite>& wlist) {
  for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}

int DivPlatformVB::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
  parent=p;
  dumpWrites=false;
  skipRegisterWrites=false;
  for (int i=0; i<6; i++) {
    isMuted[i]=false;
    oscBuf[i]=new DivDispatchOscBuffer;
  }
  vb=NULL;
  setFlags(flags);
  reset();
  return 6;
}

void DivPlatformVB::quit() {
  for (int i=0; i<6; i++) {
    delete oscBuf[i];
  }
  if (vb!=NULL) {
    delete vb;
    vb=NULL;
  }
}

DivPlatformVB::~DivPlatformVB() {
}