furnace/src/engine/platform/pong.cpp

/**
 * Furnace Tracker - multi-system chiptune tracker
 * Copyright (C) 2021-2024 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 "pong.h"
#include "../engine.h"
#include "../../ta-log.h"

#define CHIP_DIVIDER 1024

void DivPlatformPong::acquire(short** buf, size_t len) {
  int out=0;
  for (size_t i=0; i<len; i++) {
    if (on) {
      if (--pos<=0) {
        pos=(freq?2:1)<<4;
        flip=!flip;
      }
      out=(flip && !isMuted[0])?32767:0;
      buf[0][i]=out;
      oscBuf->data[oscBuf->needle++]=out;
    } else {
      buf[0][i]=0;
      oscBuf->data[oscBuf->needle++]=0;
      flip=false;
    }
  }
}

void DivPlatformPong::tick(bool sysTick) {
  for (int i=0; i<1; i++) {
    chan[i].std.next();
    if (chan[i].std.vol.had) {
      chan[i].outVol=(chan[i].vol && chan[i].std.vol.val);
      on=chan[i].outVol;
    }
    if (NEW_ARP_STRAT) {
      chan[i].handleArp();
    } else if (chan[i].std.arp.had) {
      if (!chan[i].inPorta) {
        chan[i].baseFreq=NOTE_PERIODIC(parent->calcArp(chan[i].note,chan[i].std.arp.val));
      }
      chan[i].freqChanged=true;
    }
    if (sysTick) {
      flip=false;
      pos=0;
    }
    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].freqChanged || chan[i].keyOn || chan[i].keyOff) {
      chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER)-1;
      if (chan[i].freq<0) chan[i].freq=0;
      if (chan[i].freq>1) chan[i].freq=1;
      if (chan[i].keyOn) {
        on=true;
      }
      if (chan[i].keyOff) {
        on=false;
      }
      freq=chan[i].freq;
      if (chan[i].keyOn) chan[i].keyOn=false;
      if (chan[i].keyOff) chan[i].keyOff=false;
      chan[i].freqChanged=false;
    }
  }
}

int DivPlatformPong::dispatch(DivCommand c) {
  switch (c.cmd) {
    case DIV_CMD_NOTE_ON:
      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(parent->getIns(chan[c.chan].ins,DIV_INS_BEEPER));
      if (!parent->song.brokenOutVol && !chan[c.chan].std.vol.will) {
        chan[c.chan].outVol=chan[c.chan].vol;
      }
      break;
    case DIV_CMD_NOTE_OFF:
      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;
      }
      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) {
          on=chan[c.chan].vol;
        }
      }
      break;
    case DIV_CMD_GET_VOLUME:
      return chan[c.chan].vol;
      break;
    case DIV_CMD_PITCH:
      chan[c.chan].pitch=c.value;
      chan[c.chan].freqChanged=true;
      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_LEGATO:
      if (c.chan==3) break;
      chan[c.chan].baseFreq=NOTE_PERIODIC(c.value+((HACKY_LEGATO_MESS)?(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_BEEPER));
      }
      if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=NOTE_PERIODIC(chan[c.chan].note);
      chan[c.chan].inPorta=c.value;
      break;
    case DIV_CMD_GET_VOLMAX:
      return 1;
      break;
    case DIV_CMD_MACRO_OFF:
      chan[c.chan].std.mask(c.value,true);
      break;
    case DIV_CMD_MACRO_ON:
      chan[c.chan].std.mask(c.value,false);
      break;
    case DIV_CMD_MACRO_RESTART:
      chan[c.chan].std.restart(c.value);
      break;
    default:
      break;
  }
  return 1;
}

void DivPlatformPong::muteChannel(int ch, bool mute) {
  isMuted[ch]=mute;
}

void DivPlatformPong::forceIns() {
  for (int i=0; i<1; i++) {
    chan[i].insChanged=true;
  }
}

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

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

DivDispatchOscBuffer* DivPlatformPong::getOscBuffer(int ch) {
  return oscBuf;
}

void DivPlatformPong::reset() {
  for (int i=0; i<1; i++) {
    chan[i]=DivPlatformPong::Channel();
    chan[i].std.setEngine(parent);
  }
  if (dumpWrites) {
    addWrite(0xffffffff,0);
  }

  on=false;
  lastOn=false;
  freq=0;
  pos=0;
  flip=false;

  memset(regPool,0,2);
}

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

void DivPlatformPong::setFlags(const DivConfig& flags) {
  chipClock=1000000;
  CHECK_CUSTOM_CLOCK;
  rate=chipClock/64;
  oscBuf->rate=rate;
}

void DivPlatformPong::notifyInsDeletion(void* ins) {
  for (int i=0; i<1; i++) {
    chan[i].std.notifyInsDeletion((DivInstrument*)ins);
  }
}

void DivPlatformPong::poke(unsigned int addr, unsigned short val) {
  // ???
}

void DivPlatformPong::poke(std::vector<DivRegWrite>& wlist) {
  // ???
}

int DivPlatformPong::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
  parent=p;
  dumpWrites=false;
  skipRegisterWrites=false;
  for (int i=0; i<1; i++) {
    isMuted[i]=false;
  }
  oscBuf=new DivDispatchOscBuffer;
  setFlags(flags);

  reset();
  return 5;
}

void DivPlatformPong::quit() {
  delete oscBuf;
}

DivPlatformPong::~DivPlatformPong() {
}