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furnace/src/engine/platform/segapcm.cpp

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/**
* 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 "segapcm.h"
#include "../engine.h"
#include <string.h>
#include <math.h>
//#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
//#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
const char* DivPlatformSegaPCM::getEffectName(unsigned char effect) {
switch (effect) {
case 0x20:
return "20xx: Set PCM frequency";
break;
}
return NULL;
}
void DivPlatformSegaPCM::acquire(short* bufL, short* bufR, size_t start, size_t len) {
static int os[2];
for (size_t h=start; h<start+len; h++) {
os[0]=0; os[1]=0;
// do a PCM cycle
pcmL=0; pcmR=0;
for (int i=0; i<16; i++) {
if (chan[i].pcm.sample>=0 && chan[i].pcm.sample<parent->song.sampleLen) {
DivSample* s=parent->getSample(chan[i].pcm.sample);
if (s->samples<=0) {
chan[i].pcm.sample=-1;
continue;
}
if (!isMuted[i]) {
pcmL+=(s->data8[chan[i].pcm.pos>>8]*chan[i].chVolL);
pcmR+=(s->data8[chan[i].pcm.pos>>8]*chan[i].chVolR);
}
chan[i].pcm.pos+=chan[i].pcm.freq;
if (chan[i].pcm.pos>=(s->samples<<8)) {
if (s->loopStart>=0 && s->loopStart<(int)s->samples) {
chan[i].pcm.pos=s->loopStart<<8;
} else {
chan[i].pcm.sample=-1;
}
}
}
}
os[0]=pcmL;
if (os[0]<-32768) os[0]=-32768;
if (os[0]>32767) os[0]=32767;
os[1]=pcmR;
if (os[1]<-32768) os[1]=-32768;
if (os[1]>32767) os[1]=32767;
bufL[h]=os[0];
bufR[h]=os[1];
}
}
void DivPlatformSegaPCM::tick() {
for (int i=0; i<16; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
chan[i].outVol=(chan[i].vol*MIN(127,chan[i].std.vol))/127;
}
if (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=(chan[i].std.arp<<6)+baseFreqOff;
} else {
chan[i].baseFreq=((chan[i].note+(signed char)chan[i].std.arp)<<6)+baseFreqOff;
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
chan[i].baseFreq=(chan[i].note<<6)+baseFreqOff;
chan[i].freqChanged=true;
}
}
/*if (chan[i].keyOn || chan[i].keyOff) {
chan[i].keyOff=false;
}*/
}
for (int i=0; i<16; i++) {
if (chan[i].freqChanged) {
chan[i].freq=chan[i].baseFreq+(chan[i].pitch>>1)-64;
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,((off*parent->song.tuning*pow(2.0,double(chan[i].freq+256)/(64.0*12.0)))*255)/31250);
if (dumpWrites && i>=8) {
addWrite(0x10007+((i-8)<<3),chan[i].pcm.freq);
}
}
chan[i].freqChanged=false;
}
}
}
void DivPlatformSegaPCM::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
}
int DivPlatformSegaPCM::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
if (skipRegisterWrites) break;
if (ins->type==DIV_INS_AMIGA) {
chan[c.chan].pcm.sample=ins->amiga.initSample;
if (chan[c.chan].pcm.sample<0 || chan[c.chan].pcm.sample>=parent->song.sampleLen) {
chan[c.chan].pcm.sample=-1;
if (dumpWrites) {
addWrite(0x10086+(c.chan<<3),3);
}
break;
}
chan[c.chan].pcm.pos=0;
chan[c.chan].baseFreq=(c.value<<6);
chan[c.chan].freqChanged=true;
chan[c.chan].furnacePCM=true;
if (dumpWrites) { // Sega PCM writes
DivSample* s=parent->getSample(chan[c.chan].pcm.sample);
addWrite(0x10086+(c.chan<<3),3+((s->offSegaPCM>>16)<<3));
addWrite(0x10084+(c.chan<<3),(s->offSegaPCM)&0xff);
addWrite(0x10085+(c.chan<<3),(s->offSegaPCM>>8)&0xff);
addWrite(0x10006+(c.chan<<3),MIN(255,((s->offSegaPCM&0xffff)+s->length8-1)>>8));
if (s->loopStart<0 || s->loopStart>=(int)s->length8) {
addWrite(0x10086+(c.chan<<3),2+((s->offSegaPCM>>16)<<3));
} else {
int loopPos=(s->offSegaPCM&0xffff)+s->loopStart+s->loopOffP;
addWrite(0x10004+(c.chan<<3),loopPos&0xff);
addWrite(0x10005+(c.chan<<3),(loopPos>>8)&0xff);
addWrite(0x10086+(c.chan<<3),((s->offSegaPCM>>16)<<3));
}
}
} else {
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;
if (dumpWrites) {
addWrite(0x10086+(c.chan<<3),3);
}
break;
}
chan[c.chan].pcm.pos=0;
chan[c.chan].pcm.freq=MIN(255,(parent->getSample(chan[c.chan].pcm.sample)->rate*255)/31250);
chan[c.chan].furnacePCM=false;
if (dumpWrites) { // Sega PCM writes
DivSample* s=parent->getSample(chan[c.chan].pcm.sample);
addWrite(0x10086+(c.chan<<3),3+((s->offSegaPCM>>16)<<3));
addWrite(0x10084+(c.chan<<3),(s->offSegaPCM)&0xff);
addWrite(0x10085+(c.chan<<3),(s->offSegaPCM>>8)&0xff);
addWrite(0x10006+(c.chan<<3),MIN(255,((s->offSegaPCM&0xffff)+s->length8-1)>>8));
if (s->loopStart<0 || s->loopStart>=(int)s->length8) {
addWrite(0x10086+(c.chan<<3),2+((s->offSegaPCM>>16)<<3));
} else {
int loopPos=(s->offSegaPCM&0xffff)+s->loopStart+s->loopOffP;
addWrite(0x10004+(c.chan<<3),loopPos&0xff);
addWrite(0x10005+(c.chan<<3),(loopPos>>8)&0xff);
addWrite(0x10086+(c.chan<<3),((s->offSegaPCM>>16)<<3));
}
addWrite(0x10007+(c.chan<<3),chan[c.chan].pcm.freq);
}
}
break;
}
case DIV_CMD_NOTE_OFF:
chan[c.chan].pcm.sample=-1;
if (dumpWrites) {
addWrite(0x10086+(c.chan<<3),3);
}
chan[c.chan].keyOff=true;
chan[c.chan].keyOn=false;
chan[c.chan].active=false;
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.hasVol) {
chan[c.chan].outVol=c.value;
}
chan[c.chan].chVolL=c.value;
chan[c.chan].chVolR=c.value;
if (dumpWrites) {
addWrite(0x10002+(c.chan<<3),chan[c.chan].chVolL);
addWrite(0x10003+(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: {
chan[c.chan].chVolL=(c.value>>4)|(((c.value>>4)>>1)<<4);
chan[c.chan].chVolR=(c.value&15)|(((c.value&15)>>1)<<4);
if (dumpWrites) {
addWrite(0x10002+(c.chan<<3),chan[c.chan].chVolL);
addWrite(0x10003+(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<<6)+baseFreqOff;
int newFreq;
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
newFreq=chan[c.chan].baseFreq+c.value;
if (newFreq>=destFreq) {
newFreq=destFreq;
return2=true;
}
} else {
newFreq=chan[c.chan].baseFreq-c.value;
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<<6)+baseFreqOff;
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_ALWAYS_SET_VOLUME:
return 0;
break;
case DIV_CMD_GET_VOLMAX:
return 127;
break;
case DIV_CMD_PRE_PORTA:
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;
if (dumpWrites) {
addWrite(0x10007+(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;
}
}
void DivPlatformSegaPCM::notifyInsChange(int ins) {
for (int i=0; i<16; i++) {
if (chan[i].ins==ins) {
chan[i].insChanged=true;
}
}
}
void* DivPlatformSegaPCM::getChanState(int ch) {
return &chan[ch];
}
unsigned char* DivPlatformSegaPCM::getRegisterPool() {
return regPool;
}
int DivPlatformSegaPCM::getRegisterPoolSize() {
return 256;
}
void DivPlatformSegaPCM::poke(unsigned int addr, unsigned short val) {
//immWrite(addr,val);
}
void DivPlatformSegaPCM::poke(std::vector<DivRegWrite>& wlist) {
//for (DivRegWrite& i: wlist) immWrite(i.addr,i.val);
}
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].vol=0x7f;
chan[i].outVol=0x7f;
}
lastBusy=60;
pcmCycles=0;
pcmL=0;
pcmR=0;
sampleBank=0;
delay=0;
amDepth=0x7f;
pmDepth=0x7f;
if (dumpWrites) {
for (int i=0; i<16; i++) {
addWrite(0x10086+(i<<3),3);
addWrite(0x10002+(i<<3),0x7f);
addWrite(0x10003+(i<<3),0x7f);
}
}
extMode=false;
}
void DivPlatformSegaPCM::setFlags(unsigned int flags) {
chipClock=8000000.0;
rate=31250;
}
bool DivPlatformSegaPCM::isStereo() {
return true;
}
int DivPlatformSegaPCM::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<16; i++) {
isMuted[i]=false;
}
setFlags(flags);
reset();
return 16;
}
void DivPlatformSegaPCM::quit() {
}
DivPlatformSegaPCM::~DivPlatformSegaPCM() {
}
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