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furnace/src/engine/platform/ym2608ext.cpp
tildearrow 6f22ade69a new arp strategy, part 1
2022-12-17 02:07:24 -05:00

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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 "ym2608ext.h"
#include "../engine.h"
#include <math.h>
#define CHIP_FREQBASE fmFreqBase
#define CHIP_DIVIDER fmDivBase
int DivPlatformYM2608Ext::dispatch(DivCommand c) {
if (c.chan<2) {
return DivPlatformYM2608::dispatch(c);
}
if (c.chan>5) {
c.chan-=3;
return DivPlatformYM2608::dispatch(c);
}
int ch=c.chan-2;
int ordch=orderedOps[ch];
if (!extMode) {
c.chan=2;
return DivPlatformYM2608::dispatch(c);
}
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(opChan[ch].ins,DIV_INS_FM);
unsigned short baseAddr=chanOffs[2]|opOffs[ordch];
DivInstrumentFM::Operator op=ins->fm.op[ordch];
// TODO: how does this work?!
if (isOpMuted[ch]) {
rWrite(baseAddr+0x40,127);
} else {
if (opChan[ch].insChanged) {
rWrite(baseAddr+0x40,127-VOL_SCALE_LOG_BROKEN(127-op.tl,opChan[ch].vol&0x7f,127));
}
}
if (opChan[ch].insChanged) {
rWrite(baseAddr+0x30,(op.mult&15)|(dtTable[op.dt&7]<<4));
rWrite(baseAddr+0x50,(op.ar&31)|(op.rs<<6));
rWrite(baseAddr+0x60,(op.dr&31)|(op.am<<7));
rWrite(baseAddr+0x70,op.d2r&31);
rWrite(baseAddr+0x80,(op.rr&15)|(op.sl<<4));
rWrite(baseAddr+0x90,op.ssgEnv&15);
opChan[ch].mask=op.enable;
}
if (opChan[ch].insChanged) { // TODO how does this work?
rWrite(chanOffs[2]+0xb0,(ins->fm.alg&7)|(ins->fm.fb<<3));
rWrite(chanOffs[2]+0xb4,(opChan[ch].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
}
opChan[ch].insChanged=false;
if (c.value!=DIV_NOTE_NULL) {
opChan[ch].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
opChan[ch].portaPause=false;
opChan[ch].freqChanged=true;
}
opChan[ch].keyOn=true;
opChan[ch].active=true;
break;
}
case DIV_CMD_NOTE_OFF:
opChan[ch].keyOff=true;
opChan[ch].keyOn=false;
opChan[ch].active=false;
break;
case DIV_CMD_VOLUME: {
opChan[ch].vol=c.value;
DivInstrument* ins=parent->getIns(opChan[ch].ins,DIV_INS_FM);
unsigned short baseAddr=chanOffs[2]|opOffs[ordch];
DivInstrumentFM::Operator op=ins->fm.op[ordch];
if (isOpMuted[ch]) {
rWrite(baseAddr+0x40,127);
} else {
rWrite(baseAddr+0x40,127-VOL_SCALE_LOG_BROKEN(127-op.tl,opChan[ch].vol&0x7f,127));
}
break;
}
case DIV_CMD_GET_VOLUME: {
return opChan[ch].vol;
break;
}
case DIV_CMD_INSTRUMENT:
if (opChan[ch].ins!=c.value || c.value2==1) {
opChan[ch].insChanged=true;
}
opChan[ch].ins=c.value;
break;
case DIV_CMD_PANNING: {
if (c.value==0 && c.value2==0) {
opChan[ch].pan=3;
} else {
opChan[ch].pan=(c.value2>0)|((c.value>0)<<1);
}
DivInstrument* ins=parent->getIns(opChan[ch].ins,DIV_INS_FM);
if (parent->song.sharedExtStat) {
for (int i=0; i<4; i++) {
if (ch==i) continue;
opChan[i].pan=opChan[ch].pan;
}
}
rWrite(chanOffs[2]+0xb4,(opChan[ch].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
break;
}
case DIV_CMD_PITCH: {
opChan[ch].pitch=c.value;
opChan[ch].freqChanged=true;
break;
}
case DIV_CMD_NOTE_PORTA: {
if (parent->song.linearPitch==2) {
int destFreq=NOTE_FREQUENCY(c.value2);
bool return2=false;
if (destFreq>opChan[ch].baseFreq) {
opChan[ch].baseFreq+=c.value;
if (opChan[ch].baseFreq>=destFreq) {
opChan[ch].baseFreq=destFreq;
return2=true;
}
} else {
opChan[ch].baseFreq-=c.value;
if (opChan[ch].baseFreq<=destFreq) {
opChan[ch].baseFreq=destFreq;
return2=true;
}
}
opChan[ch].freqChanged=true;
if (return2) {
//opChan[ch].inPorta=false;
return 2;
}
break;
}
PLEASE_HELP_ME(opChan[ch]);
break;
}
case DIV_CMD_LEGATO: {
opChan[ch].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
opChan[ch].freqChanged=true;
break;
}
case DIV_CMD_FM_EXTCH: {
extMode=c.value;
immWrite(0x27,extMode?0x40:0);
break;
}
case DIV_CMD_FM_LFO: {
rWrite(0x22,(c.value&7)|((c.value>>4)<<3));
break;
}
case DIV_CMD_FM_FB: {
chan[2].state.fb=c.value&7;
rWrite(chanOffs[2]+ADDR_FB_ALG,(chan[2].state.alg&7)|(chan[2].state.fb<<3));
break;
}
case DIV_CMD_FM_MULT: { // TODO
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
DivInstrument* ins=parent->getIns(opChan[ch].ins,DIV_INS_FM);
DivInstrumentFM::Operator op=ins->fm.op[orderedOps[c.value]];
rWrite(baseAddr+0x30,(c.value2&15)|(dtTable[op.dt&7]<<4));
break;
}
case DIV_CMD_FM_TL: { // TODO
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
DivInstrument* ins=parent->getIns(opChan[ch].ins,DIV_INS_FM);
if (isOutput[ins->fm.alg][c.value]) {
rWrite(baseAddr+0x40,127-(((127-c.value2)*(opChan[ch].vol&0x7f))/127));
} else {
rWrite(baseAddr+0x40,c.value2);
}
break;
}
case DIV_CMD_FM_AR: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.ar=c.value2&31;
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+0x50,(op.ar&31)|(op.rs<<6));
}
} else {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.ar=c.value2&31;
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+0x50,(op.ar&31)|(op.rs<<6));
}
break;
}
case DIV_CMD_FM_RS: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.rs=c.value2&3;
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
}
} else if (c.value<4) {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.rs=c.value2&3;
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
}
break;
}
case DIV_CMD_FM_AM: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.am=c.value2&1;
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
}
} else if (c.value<4) {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.am=c.value2&1;
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
}
break;
}
case DIV_CMD_FM_DR: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.dr=c.value2&31;
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
}
} else if (c.value<4) {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.dr=c.value2&31;
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
}
break;
}
case DIV_CMD_FM_SL: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.sl=c.value2&15;
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
}
} else if (c.value<4) {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.sl=c.value2&15;
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
}
break;
}
case DIV_CMD_FM_RR: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.rr=c.value2&15;
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
}
} else if (c.value<4) {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.rr=c.value2&15;
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
}
break;
}
case DIV_CMD_FM_D2R: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.d2r=c.value2&31;
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
}
} else if (c.value<4) {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.d2r=c.value2&31;
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
}
break;
}
case DIV_CMD_FM_DT: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.dt=c.value&7;
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
}
} else if (c.value<4) {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.dt=c.value2&7;
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
}
break;
}
case DIV_CMD_FM_SSG: {
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator& op=chan[2].state.op[i];
op.ssgEnv=8^(c.value2&15);
unsigned short baseAddr=chanOffs[2]|opOffs[i];
rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
}
} else if (c.value<4) {
DivInstrumentFM::Operator& op=chan[2].state.op[orderedOps[c.value]];
op.ssgEnv=8^(c.value2&15);
unsigned short baseAddr=chanOffs[2]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
}
break;
}
case DIV_CMD_GET_VOLMAX:
return 127;
break;
case DIV_CMD_MACRO_OFF:
opChan[ch].std.mask(c.value,true);
break;
case DIV_CMD_MACRO_ON:
opChan[ch].std.mask(c.value,false);
break;
case DIV_ALWAYS_SET_VOLUME:
return 0;
break;
case DIV_CMD_PRE_PORTA:
break;
default:
//printf("WARNING: unimplemented command %d\n",c.cmd);
break;
}
return 1;
}
static int opChanOffsL[4]={
0xa9, 0xaa, 0xa8, 0xa2
};
static int opChanOffsH[4]={
0xad, 0xae, 0xac, 0xa6
};
void DivPlatformYM2608Ext::tick(bool sysTick) {
if (extMode) {
bool writeSomething=false;
unsigned char writeMask=2;
for (int i=0; i<4; i++) {
writeMask|=(unsigned char)(opChan[i].mask && opChan[i].active)<<(4+i);
if (opChan[i].keyOn || opChan[i].keyOff) {
writeSomething=true;
writeMask&=~(1<<(4+i));
opChan[i].keyOff=false;
}
}
if (writeSomething) {
immWrite(0x28,writeMask);
}
}
DivPlatformYM2608::tick(sysTick);
bool writeNoteOn=false;
unsigned char writeMask=2;
if (extMode) for (int i=0; i<4; i++) {
if (opChan[i].freqChanged) {
if (parent->song.linearPitch==2) {
opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch,0,false,false,4,opChan[i].pitch2,chipClock,CHIP_FREQBASE,11);
} else {
int fNum=parent->calcFreq(opChan[i].baseFreq&0x7ff,opChan[i].pitch,0,false,false,4,opChan[i].pitch2);
int block=(opChan[i].baseFreq&0xf800)>>11;
if (fNum<0) fNum=0;
if (fNum>2047) {
while (block<7) {
fNum>>=1;
block++;
}
if (fNum>2047) fNum=2047;
}
opChan[i].freq=(block<<11)|fNum;
}
if (opChan[i].freq>0x3fff) opChan[i].freq=0x3fff;
immWrite(opChanOffsH[i],opChan[i].freq>>8);
immWrite(opChanOffsL[i],opChan[i].freq&0xff);
}
writeMask|=(unsigned char)(opChan[i].mask && opChan[i].active)<<(4+i);
if (opChan[i].keyOn) {
writeNoteOn=true;
if (opChan[i].mask) {
writeMask|=1<<(4+i);
}
opChan[i].keyOn=false;
}
}
if (writeNoteOn) {
immWrite(0x28,writeMask);
}
}
void DivPlatformYM2608Ext::muteChannel(int ch, bool mute) {
if (ch<2) {
DivPlatformYM2608::muteChannel(ch,mute);
return;
}
if (ch>5) {
DivPlatformYM2608::muteChannel(ch-3,mute);
return;
}
isOpMuted[ch-2]=mute;
int ordch=orderedOps[ch-2];
DivInstrument* ins=parent->getIns(opChan[ch-2].ins,DIV_INS_FM);
unsigned short baseAddr=chanOffs[2]|opOffs[ordch];
DivInstrumentFM::Operator op=ins->fm.op[ordch];
if (isOpMuted[ch-2]) {
rWrite(baseAddr+0x40,127);
} else if (isOutput[ins->fm.alg][ordch]) {
rWrite(baseAddr+0x40,127-VOL_SCALE_LOG_BROKEN(127-op.tl,opChan[ch-2].vol&0x7f,127));
} else {
rWrite(baseAddr+0x40,op.tl);
}
}
void DivPlatformYM2608Ext::forceIns() {
for (int i=0; i<6; i++) {
for (int j=0; j<4; j++) {
unsigned short baseAddr=chanOffs[i]|opOffs[j];
DivInstrumentFM::Operator& op=chan[i].state.op[j];
if (i==2) { // extended channel
if (isOpMuted[j]) {
rWrite(baseAddr+0x40,127);
} else if (KVS(i,j)) {
rWrite(baseAddr+0x40,127-VOL_SCALE_LOG_BROKEN(127-op.tl,opChan[j].vol&0x7f,127));
} else {
rWrite(baseAddr+0x40,op.tl);
}
} else {
if (isMuted[i]) {
rWrite(baseAddr+ADDR_TL,127);
} else {
if (KVS(i,j)) {
rWrite(baseAddr+ADDR_TL,127-VOL_SCALE_LOG_BROKEN(127-op.tl,chan[i].outVol&0x7f,127));
} else {
rWrite(baseAddr+ADDR_TL,op.tl);
}
}
}
rWrite(baseAddr+ADDR_MULT_DT,(op.mult&15)|(dtTable[op.dt&7]<<4));
rWrite(baseAddr+ADDR_RS_AR,(op.ar&31)|(op.rs<<6));
rWrite(baseAddr+ADDR_AM_DR,(op.dr&31)|(op.am<<7));
rWrite(baseAddr+ADDR_DT2_D2R,op.d2r&31);
rWrite(baseAddr+ADDR_SL_RR,(op.rr&15)|(op.sl<<4));
rWrite(baseAddr+ADDR_SSG,op.ssgEnv&15);
}
rWrite(chanOffs[i]+ADDR_FB_ALG,(chan[i].state.alg&7)|(chan[i].state.fb<<3));
rWrite(chanOffs[i]+ADDR_LRAF,(isMuted[i]?0:(chan[i].pan<<6))|(chan[i].state.fms&7)|((chan[i].state.ams&3)<<4));
if (chan[i].active) {
chan[i].keyOn=true;
chan[i].freqChanged=true;
}
}
for (int i=9; i<16; i++) {
chan[i].insChanged=true;
if (i>14) { // ADPCM-B
immWrite(0x10b,chan[i].outVol);
} else {
immWrite(0x18+(i-9),isMuted[i]?0:((chan[i].pan<<6)|chan[i].outVol));
}
}
ay->forceIns();
ay->flushWrites();
for (DivRegWrite& i: ay->getRegisterWrites()) {
if (i.addr>15) continue;
immWrite(i.addr&15,i.val);
}
ay->getRegisterWrites().clear();
for (int i=0; i<4; i++) {
opChan[i].insChanged=true;
if (opChan[i].active) {
opChan[i].keyOn=true;
opChan[i].freqChanged=true;
}
}
}
void* DivPlatformYM2608Ext::getChanState(int ch) {
if (ch>=6) return &chan[ch-3];
if (ch>=2) return &opChan[ch-2];
return &chan[ch];
}
DivMacroInt* DivPlatformYM2608Ext::getChanMacroInt(int ch) {
if (ch>=9 && ch<12) return ay->getChanMacroInt(ch-9);
if (ch>=6) return &chan[ch-3].std;
if (ch>=2) return NULL; // currently not implemented
return &chan[ch].std;
}
DivDispatchOscBuffer* DivPlatformYM2608Ext::getOscBuffer(int ch) {
if (ch>=6) return oscBuf[ch-3];
if (ch<3) return oscBuf[ch];
return NULL;
}
void DivPlatformYM2608Ext::reset() {
DivPlatformYM2608::reset();
for (int i=0; i<4; i++) {
opChan[i]=DivPlatformOPN::OPNOpChannelStereo();
opChan[i].vol=127;
}
// channel 2 mode
immWrite(0x27,0x40);
extMode=true;
}
bool DivPlatformYM2608Ext::keyOffAffectsArp(int ch) {
return (ch>8);
}
void DivPlatformYM2608Ext::notifyInsChange(int ins) {
DivPlatformYM2608::notifyInsChange(ins);
for (int i=0; i<4; i++) {
if (opChan[i].ins==ins) {
opChan[i].insChanged=true;
}
}
}
int DivPlatformYM2608Ext::init(DivEngine* parent, int channels, int sugRate, const DivConfig& flags) {
DivPlatformYM2608::init(parent,channels,sugRate,flags);
for (int i=0; i<4; i++) {
isOpMuted[i]=false;
}
extSys=true;
reset();
return 19;
}
void DivPlatformYM2608Ext::quit() {
DivPlatformYM2608::quit();
}
DivPlatformYM2608Ext::~DivPlatformYM2608Ext() {
}
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