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furnace/src/engine/platform/segapcm.cpp

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/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2023 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 "segapcm.h"
#include "../engine.h"
#include "../../ta-log.h"
#include <string.h>
#include <math.h>
#define rWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define chWrite(c,a,v) rWrite(((c)<<3)+(a),v)
void DivPlatformSegaPCM::acquire(short** buf, size_t len) {
static int os[2];
for (size_t h=0; h<len; h++) {
while (!writes.empty()) {
QueuedWrite w=writes.front();
pcm.write(w.addr,w.val);
regPool[w.addr&0xff]=w.val;
writes.pop();
}
pcm.sound_stream_update(os);
if (os[0]<-32768) os[0]=-32768;
if (os[0]>32767) os[0]=32767;
if (os[1]<-32768) os[1]=-32768;
if (os[1]>32767) os[1]=32767;
buf[0][h]=os[0];
buf[1][h]=os[1];
for (int i=0; i<16; i++) {
oscBuf[i]->data[oscBuf[i]->needle++]=(pcm.lastOut[i][0]+pcm.lastOut[i][1])>>1;
}
}
}
void DivPlatformSegaPCM::tick(bool sysTick) {
for (int i=0; i<16; i++) {
chan[i].std.next();
if (parent->song.newSegaPCM) {
if (chan[i].std.vol.had) {
chan[i].outVol=(chan[i].vol*MIN(chan[i].macroVolMul,chan[i].std.vol.val))/chan[i].macroVolMul;
chan[i].chVolL=(chan[i].outVol*chan[i].chPanL)/127;
chan[i].chVolR=(chan[i].outVol*chan[i].chPanR)/127;
rWrite(2+(i<<3),chan[i].chVolL);
rWrite(3+(i<<3),chan[i].chVolR);
}
}
if (NEW_ARP_STRAT) {
chan[i].handleArp();
} else if (chan[i].std.arp.had) {
if (!chan[i].inPorta) {
chan[i].baseFreq=(parent->calcArp(chan[i].note,chan[i].std.arp.val)<<7);
}
chan[i].freqChanged=true;
}
if (parent->song.newSegaPCM) if (chan[i].std.panL.had) {
chan[i].chPanL=chan[i].std.panL.val&127;
chan[i].chVolL=(chan[i].outVol*chan[i].chPanL)/127;
rWrite(2+(i<<3),chan[i].chVolL);
}
if (parent->song.newSegaPCM) if (chan[i].std.panR.had) {
chan[i].chPanR=chan[i].std.panR.val&127;
chan[i].chVolR=(chan[i].outVol*chan[i].chPanR)/127;
rWrite(3+(i<<3),chan[i].chVolR);
}
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) {
if (chan[i].std.phaseReset.val==1 && chan[i].active) {
chan[i].keyOn=true;
}
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=chan[i].baseFreq+(chan[i].pitch)-128+(oldSlides?0:chan[i].pitch2);
if (!parent->song.oldArpStrategy) {
if (chan[i].fixedArp) {
chan[i].freq=(chan[i].baseNoteOverride<<7)+chan[i].pitch-128+(chan[i].pitch2<<(oldSlides?1:0));
} else {
chan[i].freq+=chan[i].arpOff<<7;
}
}
if (oldSlides) chan[i].freq&=~1;
if (chan[i].furnacePCM) {
double off=1.0;
if (chan[i].pcm.sample>=0 && chan[i].pcm.sample<parent->song.sampleLen) {
DivSample* s=parent->getSample(chan[i].pcm.sample);
off=(double)s->centerRate/8363.0;
}
chan[i].pcm.freq=MIN(255,((rate*0.5)+(off*parent->song.tuning*pow(2.0,double(chan[i].freq+512)/(128.0*12.0)))*255)/rate)+(oldSlides?chan[i].pitch2:0);
rWrite(7+(i<<3),chan[i].pcm.freq);
}
chan[i].freqChanged=false;
if (chan[i].keyOn || chan[i].keyOff) {
if (chan[i].keyOn && !chan[i].keyOff) {
rWrite(0x86+(i<<3),3);
chan[i].pcm.pos=0;
if (chan[i].furnacePCM) {
DivSample* s=parent->getSample(chan[i].pcm.sample);
int loopStart=s->getLoopStartPosition(DIV_SAMPLE_DEPTH_8BIT);
int actualLength=(s->getLoopEndPosition(DIV_SAMPLE_DEPTH_8BIT));
if (actualLength>0xfeff) actualLength=0xfeff;
rWrite(0x86+(i<<3),3+((sampleOffSegaPCM[chan[i].pcm.sample]>>16)<<3));
rWrite(0x84+(i<<3),(sampleOffSegaPCM[chan[i].pcm.sample])&0xff);
rWrite(0x85+(i<<3),(sampleOffSegaPCM[chan[i].pcm.sample]>>8)&0xff);
rWrite(6+(i<<3),sampleEndSegaPCM[chan[i].pcm.sample]);
if (!s->isLoopable()) {
rWrite(0x86+(i<<3),2+((sampleOffSegaPCM[chan[i].pcm.sample]>>16)<<3));
} else {
int loopPos=(sampleOffSegaPCM[chan[i].pcm.sample]&0xffff)+loopStart;
logV("sampleOff: %x loopPos: %x",sampleOffSegaPCM[chan[i].pcm.sample],loopPos);
rWrite(4+(i<<3),loopPos&0xff);
rWrite(5+(i<<3),(loopPos>>8)&0xff);
rWrite(0x86+(i<<3),((sampleOffSegaPCM[chan[i].pcm.sample]>>16)<<3));
}
} else {
DivSample* s=parent->getSample(chan[i].pcm.sample);
int loopStart=s->getLoopStartPosition(DIV_SAMPLE_DEPTH_8BIT);
int actualLength=(s->getLoopEndPosition(DIV_SAMPLE_DEPTH_8BIT));
if (actualLength>0xfeff) actualLength=0xfeff;
rWrite(0x86+(i<<3),3+((sampleOffSegaPCM[chan[i].pcm.sample]>>16)<<3));
rWrite(0x84+(i<<3),(sampleOffSegaPCM[chan[i].pcm.sample])&0xff);
rWrite(0x85+(i<<3),(sampleOffSegaPCM[chan[i].pcm.sample]>>8)&0xff);
rWrite(6+(i<<3),sampleEndSegaPCM[chan[i].pcm.sample]);
if (!s->isLoopable()) {
rWrite(0x86+(i<<3),2+((sampleOffSegaPCM[chan[i].pcm.sample]>>16)<<3));
} else {
int loopPos=(sampleOffSegaPCM[chan[i].pcm.sample]&0xffff)+loopStart;
rWrite(4+(i<<3),loopPos&0xff);
rWrite(5+(i<<3),(loopPos>>8)&0xff);
rWrite(0x86+(i<<3),((sampleOffSegaPCM[chan[i].pcm.sample]>>16)<<3));
}
rWrite(7+(i<<3),chan[i].pcm.freq);
}
}
chan[i].keyOn=false;
chan[i].keyOff=false;
}
}
}
}
void DivPlatformSegaPCM::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
pcm.mute(ch,mute);
}
int DivPlatformSegaPCM::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_AMIGA);
if (skipRegisterWrites) break;
if (ins->type==DIV_INS_AMIGA || ins->type==DIV_INS_SEGAPCM) {
chan[c.chan].macroVolMul=(ins->type==DIV_INS_AMIGA)?64:127;
chan[c.chan].isNewSegaPCM=(ins->type==DIV_INS_SEGAPCM);
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].pcm.sample=ins->amiga.getSample(c.value);
c.value=ins->amiga.getFreq(c.value);
}
if (chan[c.chan].pcm.sample<0 || chan[c.chan].pcm.sample>=parent->song.sampleLen) {
chan[c.chan].pcm.sample=-1;
rWrite(0x86+(c.chan<<3),3);
chan[c.chan].macroInit(NULL);
break;
}
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].note=c.value;
chan[c.chan].baseFreq=(c.value<<7);
chan[c.chan].freqChanged=true;
}
chan[c.chan].furnacePCM=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 (parent->song.newSegaPCM) {
chan[c.chan].chVolL=(chan[c.chan].outVol*chan[c.chan].chPanL)/127;
chan[c.chan].chVolR=(chan[c.chan].outVol*chan[c.chan].chPanR)/127;
rWrite(2+(c.chan<<3),chan[c.chan].chVolL);
rWrite(3+(c.chan<<3),chan[c.chan].chVolR);
}
}
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
} else {
chan[c.chan].macroInit(NULL);
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].note=c.value;
}
chan[c.chan].pcm.sample=12*sampleBank+chan[c.chan].note%12;
if (chan[c.chan].pcm.sample>=parent->song.sampleLen) {
chan[c.chan].pcm.sample=-1;
rWrite(0x86+(c.chan<<3),3);
break;
}
chan[c.chan].pcm.freq=MIN(255,(parent->getSample(chan[c.chan].pcm.sample)->rate*255)/rate);
chan[c.chan].furnacePCM=false;
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
}
break;
}
case DIV_CMD_NOTE_OFF:
chan[c.chan].pcm.sample=-1;
rWrite(0x86+(c.chan<<3),3);
chan[c.chan].keyOff=true;
chan[c.chan].keyOn=false;
chan[c.chan].active=false;
chan[c.chan].macroInit(NULL);
break;
case DIV_CMD_NOTE_OFF_ENV:
chan[c.chan].keyOff=true;
chan[c.chan].keyOn=false;
chan[c.chan].active=false;
chan[c.chan].std.release();
break;
case DIV_CMD_ENV_RELEASE:
chan[c.chan].std.release();
break;
case DIV_CMD_VOLUME: {
chan[c.chan].vol=c.value;
if (!chan[c.chan].std.vol.has) {
chan[c.chan].outVol=c.value;
}
if (parent->song.newSegaPCM) {
chan[c.chan].chVolL=(c.value*chan[c.chan].chPanL)/127;
chan[c.chan].chVolR=(c.value*chan[c.chan].chPanR)/127;
} else {
chan[c.chan].chVolL=c.value;
chan[c.chan].chVolR=c.value;
}
rWrite(2+(c.chan<<3),chan[c.chan].chVolL);
rWrite(3+(c.chan<<3),chan[c.chan].chVolR);
break;
}
case DIV_CMD_GET_VOLUME: {
return chan[c.chan].vol;
break;
}
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value || c.value2==1) {
chan[c.chan].insChanged=true;
}
chan[c.chan].ins=c.value;
break;
case DIV_CMD_PANNING: {
if (parent->song.newSegaPCM) {
chan[c.chan].chPanL=c.value>>1;
chan[c.chan].chPanR=c.value2>>1;
chan[c.chan].chVolL=(chan[c.chan].outVol*chan[c.chan].chPanL)/127;
chan[c.chan].chVolR=(chan[c.chan].outVol*chan[c.chan].chPanR)/127;
} else {
chan[c.chan].chVolL=c.value>>1;
chan[c.chan].chVolR=c.value2>>1;
}
rWrite(2+(c.chan<<3),chan[c.chan].chVolL);
rWrite(3+(c.chan<<3),chan[c.chan].chVolR);
break;
}
case DIV_CMD_PITCH: {
chan[c.chan].pitch=c.value;
chan[c.chan].freqChanged=true;
break;
}
case DIV_CMD_NOTE_PORTA: {
int destFreq=(c.value2<<7);
int newFreq;
int mul=(oldSlides || parent->song.linearPitch!=2)?8:1;
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
newFreq=chan[c.chan].baseFreq+c.value*mul;
if (newFreq>=destFreq) {
newFreq=destFreq;
return2=true;
}
} else {
newFreq=chan[c.chan].baseFreq-c.value*mul;
if (newFreq<=destFreq) {
newFreq=destFreq;
return2=true;
}
}
chan[c.chan].baseFreq=newFreq;
chan[c.chan].freqChanged=true;
if (return2) {
chan[c.chan].inPorta=false;
return 2;
}
break;
}
case DIV_CMD_LEGATO: {
chan[c.chan].baseFreq=(c.value<<7);
chan[c.chan].freqChanged=true;
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_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_ALWAYS_SET_VOLUME:
return 0;
break;
case DIV_CMD_GET_VOLMAX:
return 127;
break;
case DIV_CMD_PRE_PORTA:
if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=(chan[c.chan].note<<7);
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_PRE_NOTE:
break;
case DIV_CMD_SAMPLE_FREQ:
chan[c.chan].pcm.freq=c.value;
rWrite(7+(c.chan<<3),chan[c.chan].pcm.freq);
break;
default:
//printf("WARNING: unimplemented command %d\n",c.cmd);
break;
}
return 1;
}
void DivPlatformSegaPCM::forceIns() {
for (int i=0; i<16; i++) {
chan[i].insChanged=true;
rWrite(2+(i<<3),chan[i].chVolL);
rWrite(3+(i<<3),chan[i].chVolR);
rWrite(7+(i<<3),chan[i].pcm.freq);
}
}
void DivPlatformSegaPCM::notifyInsChange(int ins) {
for (int i=0; i<16; i++) {
if (chan[i].ins==ins) {
chan[i].insChanged=true;
}
}
}
void DivPlatformSegaPCM::notifyInsDeletion(void* ins) {
for (int i=0; i<16; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void* DivPlatformSegaPCM::getChanState(int ch) {
return &chan[ch];
}
DivMacroInt* DivPlatformSegaPCM::getChanMacroInt(int ch) {
return &chan[ch].std;
}
DivSamplePos DivPlatformSegaPCM::getSamplePos(int ch) {
if (ch>=16) return DivSamplePos();
if (chan[ch].pcm.sample<0 || chan[ch].pcm.sample>=parent->song.sampleLen) return DivSamplePos();
if (!pcm.is_playing(ch)) return DivSamplePos();
return DivSamplePos(
chan[ch].pcm.sample,
pcm.get_addr(ch)-sampleOffSegaPCM[chan[ch].pcm.sample],
122*(chan[ch].pcm.freq+1)
);
}
DivDispatchOscBuffer* DivPlatformSegaPCM::getOscBuffer(int ch) {
return oscBuf[ch];
}
unsigned char* DivPlatformSegaPCM::getRegisterPool() {
return pcm.get_ram();
}
int DivPlatformSegaPCM::getRegisterPoolSize() {
return 256;
}
void DivPlatformSegaPCM::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformSegaPCM::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
const void* DivPlatformSegaPCM::getSampleMem(int index) {
return index == 0 ? sampleMem : NULL;
}
size_t DivPlatformSegaPCM::getSampleMemCapacity(int index) {
return index == 0 ? 2097152 : 0;
}
size_t DivPlatformSegaPCM::getSampleMemUsage(int index) {
return index == 0 ? sampleMemLen : 0;
}
bool DivPlatformSegaPCM::isSampleLoaded(int index, int sample) {
if (index!=0) return false;
if (sample<0 || sample>255) return false;
return sampleLoaded[sample];
}
void DivPlatformSegaPCM::reset() {
while (!writes.empty()) writes.pop();
memset(regPool,0,256);
for (int i=0; i<16; i++) {
chan[i]=DivPlatformSegaPCM::Channel();
chan[i].std.setEngine(parent);
chan[i].vol=0x7f;
chan[i].outVol=0x7f;
}
lastBusy=60;
pcmCycles=0;
pcmL=0;
pcmR=0;
sampleBank=0;
delay=0;
pcm.device_start();
for (int i=0; i<16; i++) {
rWrite(0x86+(i<<3),3);
rWrite(2+(i<<3),0x7f);
rWrite(3+(i<<3),0x7f);
}
}
void DivPlatformSegaPCM::renderSamples(int sysID) {
size_t memPos=0;
memset(sampleMem,0,2097152);
memset(sampleLoaded,0,256*sizeof(bool));
memset(sampleOffSegaPCM,0,256*sizeof(unsigned int));
memset(sampleEndSegaPCM,0,256);
for (int i=0; i<parent->song.sampleLen; i++) {
DivSample* sample=parent->getSample(i);
unsigned int alignedSize=sample->getLoopEndPosition(DIV_SAMPLE_DEPTH_8BIT);
if (alignedSize>=65279) alignedSize=65279;
if ((memPos&(~0xffff))!=((memPos+alignedSize)&(~0xffff))) {
memPos=(memPos+0xffff)&(~0xffff);
}
if (alignedSize&0xff) {
memPos=((memPos+255)&(~0xff))+256-(alignedSize&0xff);
}
logV("- sample %d will be at %x with length %x",i,memPos,alignedSize);
sampleLoaded[i]=true;
if (memPos>=2097152) break;
sampleOffSegaPCM[i]=memPos;
for (unsigned int j=0; j<alignedSize; j++) {
if (j>=sample->samples) {
sampleMem[memPos++]=0;
} else {
sampleMem[memPos++]=((unsigned char)sample->data8[j]+0x80);
}
sampleEndSegaPCM[i]=((memPos+0xff)>>8)-1;
if (memPos>=2097152) break;
}
logV(" and it ends in %d",sampleEndSegaPCM[i]);
if (memPos>=2097152) break;
}
sampleMemLen=memPos;
}
void DivPlatformSegaPCM::setFlags(const DivConfig& flags) {
chipClock=8000000.0;
CHECK_CUSTOM_CLOCK;
rate=chipClock/256;
for (int i=0; i<16; i++) {
oscBuf[i]->rate=rate;
}
oldSlides=flags.getBool("oldSlides",false);
}
int DivPlatformSegaPCM::getOutputCount() {
return 2;
}
int DivPlatformSegaPCM::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<16; i++) {
isMuted[i]=false;
oscBuf[i]=new DivDispatchOscBuffer;
}
sampleMem=new unsigned char[2097152];
pcm.set_bank(segapcm_device::BANK_12M|segapcm_device::BANK_MASKF8);
pcm.set_read([this](unsigned int addr) -> unsigned char {
return sampleMem[addr&0x1fffff];
});
setFlags(flags);
reset();
return 16;
}
void DivPlatformSegaPCM::quit() {
for (int i=0; i<16; i++) {
delete oscBuf[i];
}
delete sampleMem;
}
DivPlatformSegaPCM::~DivPlatformSegaPCM() {
}
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