furnace/src/engine/platform/powernoise.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 "powernoise.h"
#include "../engine.h"
#include "../../ta-log.h"
#include "furIcons.h"
#include <math.h>

#define rWrite(a,v) if (!skipRegisterWrites) {regPool[a] = (v); pwrnoise_write(&pn, (uint8_t)(a), (uint8_t)(v)); if (dumpWrites) {addWrite(a,v);} }
#define cWrite(c,a,v) rWrite((c << 3) | ((a) + 1), (v))
#define noiseCtl(enable, am, tapB) (((enable) ? 0x80 : 0x00) | ((am) ? 0x02 : 0x00) | ((tapB) ? 0x01 : 0x00))
#define slopeCtl(enable, rst, a, b) (((enable) ? 0x80 : 0x00) | \
  (rst ? 0x40 : 0x00) | \
  (a.clip ? 0x20 : 0x00) | \
  (b.clip ? 0x10 : 0x00) | \
  (a.reset ? 0x08 : 0x00) | \
  (b.reset ? 0x04 : 0x00) | \
  (a.dir ? 0x02 : 0x00) | \
  (b.dir ? 0x01 : 0x00))
#define volPan(v, p)  (((v * (p >> 4) / 15) << 4) | ((v * (p & 0xf) / 15) & 0xf))
#define mapAmp(a) ((((a) * 65535 / 63 - 32768) * (pn.flags & 0x7) / 7) >> 1)
#define CHIP_DIVIDER 128

const char* regCheatSheetPowerNoise[]={
  "ACTL", "00",
  "N1CTL", "01",
  "N1FL", "02",
  "N1FH", "03",
  "N1SRL", "04",
  "N1SRH", "05",
  "N1TAP", "06",
  "N1V", "07",
  "IOA", "08",
  "N2CTL", "09",
  "N2FL", "0A",
  "N2FH", "0B",
  "N2SRL", "0C",
  "N2SRH", "0D",
  "N2TAP", "0E",
  "N2V", "0F",
  "IOB", "10",
  "N3CTL", "11",
  "N3FL", "12",
  "N3FH", "13",
  "N3SRL", "14",
  "N3SRH", "15",
  "N3TAP", "16",
  "N3V", "17",
  "SLACC", "18",
  "SLCTL", "19",
  "SLFL", "1A",
  "SLFH", "1B",
  "SLPA", "1C",
  "SLPB", "1D",
  "SLPO", "1E",
  "SLV", "1F",
  NULL
};

const char** DivPlatformPowerNoise::getRegisterSheet() {
  return regCheatSheetPowerNoise;
}

void DivPlatformPowerNoise::acquire(short** buf, size_t len) {
  int16_t left, right;
  
  for (size_t h=0; h<len; h++) {
    pwrnoise_step(&pn, 32, &left, &right);
    
    oscBuf[0]->data[oscBuf[0]->needle++]=mapAmp(((pn.n1.out_latch>>1)&0x7)+(pn.n1.out_latch>>5));
    oscBuf[1]->data[oscBuf[1]->needle++]=mapAmp(((pn.n2.out_latch>>1)&0x7)+(pn.n2.out_latch>>5));
    oscBuf[2]->data[oscBuf[2]->needle++]=mapAmp(((pn.n3.out_latch>>1)&0x7)+(pn.n3.out_latch>>5));
    oscBuf[3]->data[oscBuf[3]->needle++]=mapAmp(((pn.s.out_latch>>1)&0x7)+(pn.s.out_latch>>5));
    
    buf[0][h] = left;
    buf[1][h] = right;
  }
}

/* macros:
 *  EX1 - control (0-63)
 *  EX2 - portion A length (0-255) - slope only
 *  EX3 - portion B length (0-255) - slope only
 *  EX4 - tap A location (0-15) - noise only
 *  EX5 - tap B location (0-15) - noise only
 *  EX6 - portion A offset (0-15) - slope only
 *  EX7 - portion B offset (0-15) - slope only
 *  EX8 - load LFSR (0-65535) - noise only
**/

void DivPlatformPowerNoise::tick(bool sysTick) {
  for(int i = 0; i < 4; i++) {
    chan[i].std.next();
    
    if (chan[i].std.ex1.had) {
      int val = chan[i].std.ex1.val;
      
      if (chan[i].slope) {
        chan[i].slopeA.clip = ((val & 0x20) != 0);
        chan[i].slopeB.clip = ((val & 0x10) != 0);
        chan[i].slopeA.reset = ((val & 0x08) != 0);
        chan[i].slopeB.reset = ((val & 0x04) != 0);
        chan[i].slopeA.dir = ((val & 0x02) != 0);
        chan[i].slopeB.dir = ((val & 0x01) != 0);
        cWrite(i, 0x00, slopeCtl(chan[i].active, false, chan[i].slopeA, chan[i].slopeB));
      }
      else {
        chan[i].am = ((val & 0x02) != 0);
        chan[i].tapBEnable = ((val & 0x01) != 0);
        cWrite(i, 0x00, noiseCtl(chan[i].active, chan[i].am, chan[i].tapBEnable));
      }
    }
    if (chan[i].std.ex2.had && chan[i].slope) {
      cWrite(i, 0x03, chan[i].std.ex2.val);
    }
    if (chan[i].std.ex3.had && chan[i].slope) {
      cWrite(i, 0x04, chan[i].std.ex3.val);
    }
    if ((chan[i].std.ex4.had || chan[i].std.ex5.had) && !chan[i].slope) {
      cWrite(i, 0x05, (chan[i].std.ex4.val << 4) | chan[i].std.ex5.val);
    }
    if ((chan[i].std.ex6.had || chan[i].std.ex7.had) && chan[i].slope) {
      cWrite(i, 0x05, (chan[i].std.ex6.val << 4) | chan[i].std.ex7.val);
    }
    if (chan[i].std.ex8.had && !chan[i].slope) {
      cWrite(i, 0x03, chan[i].std.ex8.val & 0xff);
      cWrite(i, 0x04, chan[i].std.ex8.val >> 8);
    }
    
    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].outVol<0) chan[i].outVol=0;
    }
    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 (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.vol.had || chan[i].std.panL.had || chan[i].std.panR.had) {
      cWrite(i,0x06,isMuted[i]?0:volPan(chan[i].outVol, 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].slope) {
        cWrite(i, 0x00, slopeCtl(chan[i].active, true, chan[i].slopeA, chan[i].slopeB));
        chan[i].keyOn=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);
      
      if (chan[i].freq<0) chan[i].freq=0;
      if (chan[i].freq>0x7ffffff) chan[i].freq=0x7ffffff;
      
      if (chan[i].freq >= 0x4000000) {
        chan[i].octave = 15;
      }
      else if (chan[i].freq >= 0x2000000) {
        chan[i].octave = 14;
      }
      else if (chan[i].freq >= 0x1000000) {
        chan[i].octave = 13;
      }
      else if (chan[i].freq >= 0x800000) {
        chan[i].octave = 12;
      }
      else if (chan[i].freq >= 0x400000) {
        chan[i].octave = 11;
      }
      else if (chan[i].freq >= 0x200000) {
        chan[i].octave = 10;
      }
      else if (chan[i].freq >= 0x100000) {
        chan[i].octave = 9;
      }
      else if (chan[i].freq >= 0x80000) {
        chan[i].octave = 8;
      }
      else if (chan[i].freq >= 0x40000) {
        chan[i].octave = 7;
      }
      else if (chan[i].freq >= 0x20000) {
        chan[i].octave = 6;
      }
      else if (chan[i].freq >= 0x10000) {
        chan[i].octave = 5;
      }
      else if (chan[i].freq >= 0x8000) {
        chan[i].octave = 4;
      }
      else if (chan[i].freq >= 0x4000) {
        chan[i].octave = 3;
      }
      else if (chan[i].freq >= 0x2000) {
        chan[i].octave = 2;
      }
      else if (chan[i].freq >= 0x1000) {
        chan[i].octave = 1;
      }
      else {
        chan[i].octave = 0;
      }
      
      chan[i].freq = 0xfff-(chan[i].freq>>chan[i].octave);
      
      cWrite(i,0x01,chan[i].freq&0xff);
      cWrite(i,0x02,(chan[i].freq>>8) | (chan[i].octave<<4));
      
      if (chan[i].keyOn) {
        if (chan[i].slope) {
          cWrite(i, 0x00, slopeCtl(true, false, chan[i].slopeA, chan[i].slopeB));
        }
        else {
          cWrite(i, 0x00, noiseCtl(true, chan[i].am, chan[i].tapBEnable));
        }
      }
      if (chan[i].keyOff) {
        if (chan[i].slope) {
          cWrite(i, 0x00, slopeCtl(false, false, chan[i].slopeA, chan[i].slopeB));
        }
        else {
          cWrite(i, 0x00, noiseCtl(false, chan[i].am, chan[i].tapBEnable));
        }
      }
      
      if (chan[i].keyOn) chan[i].keyOn=false;
      if (chan[i].keyOff) chan[i].keyOff=false;
      chan[i].freqChanged=false;
    }
    
    if (chan[i].slope) {
      uint8_t counter = pn.s.accum;
      regPool[0x18] = counter;
    }
    else {
      uint16_t lfsr;
      if (i == 0) lfsr = pn.n1.lfsr;
      else if (i == 1) lfsr = pn.n2.lfsr;
      else lfsr = pn.n3.lfsr;
      regPool[(i << 3) + 0x4] = lfsr & 0xff;
      regPool[(i << 3) + 0x5] = lfsr >> 8;
    }
  }
}

int DivPlatformPowerNoise::dispatch(DivCommand c) {
  switch (c.cmd) {
    case DIV_CMD_NOTE_ON: {
      DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_POWER_NOISE);
      if (ins->type==DIV_INS_POWER_NOISE) {
        if (skipRegisterWrites) 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].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;
      }
      chan[c.chan].insChanged=false;
      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;
        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;
        }
      }
      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_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 > 0x7ffffff) {
          chan[c.chan].baseFreq = 0x7ffffff;
        }
        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 < 0) {
          chan[c.chan].baseFreq = 0;
        }
        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_PANNING:
      chan[c.chan].pan=(c.value&0xf0)|(c.value2>>4);
      break;
    case DIV_CMD_LEGATO: {
      int whatAMess = c.value+((HACKY_LEGATO_MESS)?(chan[c.chan].std.arp.val):(0));
      
      chan[c.chan].baseFreq=NOTE_PERIODIC(whatAMess);
      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_POWER_NOISE));
      }
      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(c.value);
      }
      chan[c.chan].inPorta=c.value;
      break;
    }
    case DIV_CMD_GET_VOLMAX:
      return 15;
      break;
    case DIV_CMD_POWER_NOISE_COUNTER_LOAD: {
      if (chan[c.chan].slope && c.value == 0) {
        rWrite(0x18, c.value2 & 0x7f);
      }
      else if (!chan[c.chan].slope) {
        cWrite(c.chan, 0x03 + c.value, c.value2);
      }
      break;
    }
    case DIV_CMD_POWER_NOISE_IO_WRITE:
      rWrite(0x08 + (c.value << 3), c.value2);
      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 DivPlatformPowerNoise::muteChannel(int ch, bool mute) {
  isMuted[ch] = mute;
  cWrite(ch,0x06,isMuted[ch]?0:volPan(chan[ch].outVol, chan[ch].pan));
}

void DivPlatformPowerNoise::forceIns() {
  for (int i=0; i<4; i++) {
    chan[i].insChanged=true;
    chan[i].freqChanged=true;
  }
}

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

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

unsigned short DivPlatformPowerNoise::getPan(int ch) {
  return ((chan[ch].pan&0xf0)<<4)|(chan[ch].pan&15);
}

DivChannelModeHints DivPlatformPowerNoise::getModeHints(int ch) {
  DivChannelModeHints ret;
  ret.count=0;
  return ret;
}

DivSamplePos DivPlatformPowerNoise::getSamplePos(int ch) {
  return DivSamplePos();
}

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

int DivPlatformPowerNoise::mapVelocity(int ch, float vel) {
  return round(15.0*pow(vel,0.22));
}

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

int DivPlatformPowerNoise::getRegisterPoolSize() {
  return 32;
}

void DivPlatformPowerNoise::reset() {
  memset(regPool,0,32);
  for (int i=0; i<4; i++) {
    chan[i]=DivPlatformPowerNoise::Channel();
    chan[i].std.setEngine(parent);
    chan[i].slope = i == 3;
  }
  
  pwrnoise_reset(&pn);
  
  // set master volume to full
  rWrite(0,0x87);
  // set per-channel panning
  for (int i=0; i<4; i++) {
    cWrite(i,0x06,volPan(chan[i].outVol, chan[i].pan));
  }
  addWrite(0xffffffff, 0);
}

int DivPlatformPowerNoise::getOutputCount() {
  return 2;
}

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

void DivPlatformPowerNoise::notifyWaveChange(int wave) {
}

void DivPlatformPowerNoise::notifyInsDeletion(void* ins) {
  for (int i=0; i<4; i++) {
    chan[i].std.notifyInsDeletion((DivInstrument*)ins);
  }
}

void DivPlatformPowerNoise::setFlags(const DivConfig& flags) {
  chipClock=16000000;
  
  CHECK_CUSTOM_CLOCK;
  rate=chipClock/32;
  
  for (int i=0; i<4; i++) {
    oscBuf[i]->rate=rate;
  }
}

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

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

int DivPlatformPowerNoise::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
  parent=p;
  dumpWrites=false;
  skipRegisterWrites=false;
  
  for (int i=0; i<4; i++) {
    oscBuf[i]=new DivDispatchOscBuffer;
    isMuted[i]=false;
  }
  setFlags(flags);
  reset();
  return 4;
}

void DivPlatformPowerNoise::quit() {
  for (int i=0; i<4; i++) {
    delete oscBuf[i];
  }
}

DivPlatformPowerNoise::~DivPlatformPowerNoise() {
}