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add Neo Geo extended channel 2 support

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tildearrow 2021-12-14 14:31:57 -05:00
parent 004e8341c2
commit 95e3a098d0
6 changed files with 290 additions and 3 deletions
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1
CMakeLists.txt
View file

@ -102,6 +102,7 @@ src/engine/platform/nes.cpp
src/engine/platform/c64.cpp
src/engine/platform/arcade.cpp
src/engine/platform/ym2610.cpp
src/engine/platform/ym2610ext.cpp
src/engine/platform/dummy.cpp)
set(GUI_SOURCES

4
src/engine/engine.cpp
View file

@ -15,6 +15,7 @@
#include "platform/c64.h"
#include "platform/arcade.h"
#include "platform/ym2610.h"
#include "platform/ym2610ext.h"
#include "platform/dummy.h"
#include <math.h>
#include <zlib.h>
@ -1239,6 +1240,9 @@ void DivEngine::initDispatch() {
case DIV_SYSTEM_YM2610:
dispatch=new DivPlatformYM2610;
break;
case DIV_SYSTEM_YM2610_EXT:
dispatch=new DivPlatformYM2610Ext;
break;
default:
logW("this system is not supported yet! using dummy platform.\n");
dispatch=new DivPlatformDummy;

4
src/engine/platform/ym2610.cpp
View file

@ -5,9 +5,6 @@
#include "ym2610shared.h"
#define FM_FREQ_BASE 622.0f
#define PSG_FREQ_BASE 7640.0f
static unsigned char konOffs[4]={
1, 2, 5, 6
};
@ -22,6 +19,7 @@ void DivPlatformYM2610::acquire(short* bufL, short* bufR, size_t start, size_t l
QueuedWrite& w=writes.front();
fm->write(0x0+((w.addr>>8)<<1),w.addr);
fm->write(0x1+((w.addr>>8)<<1),w.val);
printf("%.2x = %.2x\n",w.addr,w.val);
writes.pop();
delay=4;
}

258
src/engine/platform/ym2610ext.cpp Normal file
View file

@ -0,0 +1,258 @@
#include "ym2610ext.h"
#include "../engine.h"
#include <math.h>
#include "ym2610shared.h"
int DivPlatformYM2610Ext::dispatch(DivCommand c) {
if (c.chan<1) {
return DivPlatformYM2610::dispatch(c);
}
if (c.chan>4) {
c.chan-=3;
return DivPlatformYM2610::dispatch(c);
}
int ch=c.chan-1;
int ordch=orderedOps[ch];
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(opChan[ch].ins);
unsigned short baseAddr=chanOffs[1]|opOffs[ordch];
DivInstrumentFM::Operator op=ins->fm.op[ordch];
if (isOutput[ins->fm.alg][ordch]) {
if (!opChan[ch].active || opChan[ch].insChanged) {
rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
}
} else {
if (opChan[ch].insChanged) {
rWrite(baseAddr+0x40,op.tl);
}
}
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);
}
if (opChan[ch].insChanged) { // TODO how does this work?
rWrite(chanOffs[1]+0xb0,(ins->fm.alg&7)|(ins->fm.fb<<3));
rWrite(chanOffs[1]+0xb4,(opChan[ch].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
}
opChan[ch].insChanged=false;
opChan[ch].baseFreq=FM_FREQ_BASE*pow(2.0f,((float)c.value/12.0f));
opChan[ch].freqChanged=true;
opChan[ch].keyOn=true;
opChan[ch].active=true;
break;
}
case DIV_CMD_NOTE_OFF:
opChan[ch].keyOff=true;
opChan[ch].active=false;
break;
case DIV_CMD_VOLUME: {
opChan[ch].vol=c.value;
DivInstrument* ins=parent->getIns(opChan[ch].ins);
unsigned short baseAddr=chanOffs[1]|opOffs[ordch];
DivInstrumentFM::Operator op=ins->fm.op[ordch];
if (isOutput[ins->fm.alg][ordch]) {
rWrite(baseAddr+0x40,127-(((127-op.tl)*(opChan[ch].vol&0x7f))/127));
} else {
rWrite(baseAddr+0x40,op.tl);
}
break;
}
case DIV_CMD_GET_VOLUME: {
return opChan[ch].vol;
break;
}
case DIV_CMD_INSTRUMENT:
if (opChan[ch].ins!=c.value) {
opChan[ch].insChanged=true;
}
opChan[ch].ins=c.value;
break;
case DIV_CMD_PANNING: {
switch (c.value) {
case 0x01:
opChan[ch].pan=1;
break;
case 0x10:
opChan[ch].pan=2;
break;
default:
opChan[ch].pan=3;
break;
}
DivInstrument* ins=parent->getIns(opChan[ch].ins);
// TODO: ???
rWrite(chanOffs[1]+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: {
int destFreq=FM_FREQ_BASE*pow(2.0f,((float)c.value2/12.0f));
int newFreq;
bool return2=false;
if (destFreq>opChan[ch].baseFreq) {
newFreq=opChan[ch].baseFreq+c.value*octave(opChan[ch].baseFreq);
if (newFreq>=destFreq) {
newFreq=destFreq;
return2=true;
}
} else {
newFreq=opChan[ch].baseFreq-c.value*octave(opChan[ch].baseFreq);
if (newFreq<=destFreq) {
newFreq=destFreq;
return2=true;
}
}
if (!opChan[ch].portaPause) {
if (octave(opChan[ch].baseFreq)!=octave(newFreq)) {
opChan[ch].portaPause=true;
break;
}
}
opChan[ch].baseFreq=newFreq;
opChan[ch].portaPause=false;
opChan[ch].freqChanged=true;
if (return2) return 2;
break;
}
case DIV_CMD_SAMPLE_MODE: {
// ignored on extended channel 2 mode.
break;
}
case DIV_CMD_LEGATO: {
opChan[ch].baseFreq=FM_FREQ_BASE*pow(2.0f,((float)c.value/12.0f));
opChan[ch].freqChanged=true;
break;
}
case DIV_CMD_FM_MULT: { // TODO
unsigned short baseAddr=chanOffs[1]|opOffs[orderedOps[c.value]];
DivInstrument* ins=parent->getIns(opChan[ch].ins);
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[1]|opOffs[orderedOps[c.value]];
DivInstrument* ins=parent->getIns(opChan[ch].ins);
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: {
DivInstrument* ins=parent->getIns(opChan[ch].ins);
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator op=ins->fm.op[i];
unsigned short baseAddr=chanOffs[1]|opOffs[i];
rWrite(baseAddr+0x50,(c.value2&31)|(op.rs<<6));
}
} else {
DivInstrumentFM::Operator op=ins->fm.op[orderedOps[c.value]];
unsigned short baseAddr=chanOffs[1]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+0x50,(c.value2&31)|(op.rs<<6));
}
break;
}
case DIV_CMD_GET_VOLMAX:
return 127;
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 DivPlatformYM2610Ext::tick() {
if (extMode) {
bool writeSomething=false;
unsigned char writeMask=2;
for (int i=0; i<4; i++) {
writeMask|=opChan[i].active<<(4+i);
if (opChan[i].keyOn || opChan[i].keyOff) {
writeSomething=true;
writeMask&=~(1<<(4+i));
opChan[i].keyOff=false;
}
}
if (writeSomething) {
writes.emplace(0x28,writeMask);
}
}
DivPlatformYM2610::tick();
bool writeNoteOn=false;
unsigned char writeMask=2;
if (extMode) for (int i=0; i<4; i++) {
if (opChan[i].freqChanged) {
opChan[i].freq=(opChan[i].baseFreq*(ONE_SEMITONE+opChan[i].pitch))/ONE_SEMITONE;
int freqt=toFreq(opChan[i].freq);
opChan[i].freqH=freqt>>8;
opChan[i].freqL=freqt&0xff;
writes.emplace(opChanOffsH[i],opChan[i].freqH);
writes.emplace(opChanOffsL[i],opChan[i].freqL);
opChan[i].freqChanged=false;
}
writeMask|=opChan[i].active<<(4+i);
if (opChan[i].keyOn) {
writeNoteOn=true;
writeMask|=1<<(4+i);
opChan[i].keyOn=false;
}
}
if (writeNoteOn) {
writes.emplace(0x28,writeMask);
}
}
void DivPlatformYM2610Ext::reset() {
DivPlatformYM2610::reset();
for (int i=0; i<4; i++) {
opChan[i]=DivPlatformYM2610Ext::OpChannel();
opChan[i].vol=127;
}
// channel 2 mode
writes.emplace(0x27,0x40);
extMode=true;
}
bool DivPlatformYM2610Ext::keyOffAffectsArp(int ch) {
return (ch>7);
}
int DivPlatformYM2610Ext::init(DivEngine* parent, int channels, int sugRate, bool pal) {
DivPlatformYM2610::init(parent,channels,sugRate,pal);
reset();
return 16;
}

23
src/engine/platform/ym2610ext.h Normal file
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@ -0,0 +1,23 @@
#include "../dispatch.h"
#include "ym2610.h"
class DivPlatformYM2610Ext: public DivPlatformYM2610 {
struct OpChannel {
unsigned char freqH, freqL;
int freq, baseFreq, pitch;
unsigned char ins;
signed char konCycles;
bool active, insChanged, freqChanged, keyOn, keyOff, portaPause;
int vol;
unsigned char pan;
OpChannel(): freqH(0), freqL(0), freq(0), baseFreq(0), pitch(0), ins(-1), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), portaPause(false), vol(0), pan(3) {}
};
OpChannel opChan[4];
public:
int dispatch(DivCommand c);
void reset();
void tick();
bool keyOffAffectsArp(int ch);
int init(DivEngine* parent, int channels, int sugRate, bool pal);
};

3
src/engine/platform/ym2610shared.h
View file

@ -24,3 +24,6 @@ static int orderedOps[4]={
};
#define rWrite(a,v) pendingWrites[a]=v;
#define FM_FREQ_BASE 622.0f
#define PSG_FREQ_BASE 7640.0f