furnace/src/engine/platform/amiga.cpp

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#include "amiga.h"
#include "../engine.h"
#include <math.h>
#define AMIGA_DIVIDER 8
#define CHIP_DIVIDER 16
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const char* regCheatSheetAmiga[]={
"DMACON", "96",
"INTENA", "9A",
"ADKCON", "9E",
"AUD0LCH", "A0",
"AUD0LCL", "A2",
"AUD0LEN", "A4",
"AUD0PER", "A6",
"AUD0VOL", "A8",
"AUD0DAT", "AA",
"AUD1LCH", "B0",
"AUD1LCL", "B2",
"AUD1LEN", "B4",
"AUD1PER", "B6",
"AUD1VOL", "B8",
"AUD1DAT", "BA",
"AUD2LCH", "C0",
"AUD2LCL", "C2",
"AUD2LEN", "C4",
"AUD2PER", "C6",
"AUD2VOL", "C8",
"AUD2DAT", "CA",
"AUD3LCH", "D0",
"AUD3LCL", "D2",
"AUD3LEN", "D4",
"AUD3PER", "D6",
"AUD3VOL", "D8",
"AUD3DAT", "DA",
NULL
};
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const char** DivPlatformAmiga::getRegisterSheet() {
return regCheatSheetAmiga;
}
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void DivPlatformAmiga::acquire(short* bufL, short* bufR, size_t start, size_t len) {
for (size_t h=start; h<start+len; h++) {
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bufL[h]=0;
bufR[h]=0;
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for (int i=0; i<4; i++) {
if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
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chan[i].audSub-=AMIGA_DIVIDER;
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if (chan[i].audSub<0) {
DivSample* s=parent->song.sample[chan[i].sample];
if (s->rendLength>0) {
if (s->depth==8) {
chan[i].audDat=s->rendData[chan[i].audPos++];
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} else {
chan[i].audDat=s->rendData[chan[i].audPos++]>>8;
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}
if (chan[i].audPos>=s->rendLength || chan[i].audPos>=131071) {
if (s->loopStart>=0 && s->loopStart<=(int)s->rendLength) {
chan[i].audPos=s->loopStart;
} else {
chan[i].sample=-1;
}
}
} else {
chan[i].sample=-1;
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}
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/*if (chan[i].freq<124) {
// ???
}*/
chan[i].audSub+=MAX(114,chan[i].freq);
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}
}
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if (!isMuted[i]) {
if (i==0 || i==3) {
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bufL[h]+=((chan[i].audDat*chan[i].outVol)*sep1)>>7;
bufR[h]+=((chan[i].audDat*chan[i].outVol)*sep2)>>7;
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} else {
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bufL[h]+=((chan[i].audDat*chan[i].outVol)*sep2)>>7;
bufR[h]+=((chan[i].audDat*chan[i].outVol)*sep1)>>7;
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}
}
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}
}
}
void DivPlatformAmiga::tick() {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
chan[i].outVol=((chan[i].vol%65)*MIN(64,chan[i].std.vol))>>6;
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}
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double off=1.0;
if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
DivSample* s=parent->song.sample[chan[i].sample];
if (s->centerRate<1) {
off=1.0;
} else {
off=8363.0/(double)s->centerRate;
}
}
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if (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
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chan[i].baseFreq=off*NOTE_PERIODIC(chan[i].std.arp);
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} else {
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chan[i].baseFreq=off*NOTE_PERIODIC(chan[i].note+chan[i].std.arp);
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}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
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chan[i].baseFreq=off*NOTE_PERIODIC(chan[i].note);
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chan[i].freqChanged=true;
}
}
if (chan[i].std.hadWave) {
if (chan[i].wave!=chan[i].std.wave) {
chan[i].wave=chan[i].std.wave;
if (!chan[i].keyOff) chan[i].keyOn=true;
}
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
//DivInstrument* ins=parent->getIns(chan[i].ins);
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
if (chan[i].freq>4095) chan[i].freq=4095;
if (chan[i].note>0x5d) chan[i].freq=0x01;
if (chan[i].keyOn) {
if (chan[i].wave<0) {
chan[i].wave=0;
}
}
if (chan[i].keyOff) {
}
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
}
}
int DivPlatformAmiga::dispatch(DivCommand c) {
switch (c.cmd) {
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case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
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chan[c.chan].sample=ins->amiga.initSample;
double off=1.0;
if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
DivSample* s=parent->song.sample[chan[c.chan].sample];
if (s->centerRate<1) {
off=1.0;
} else {
off=8363.0/(double)s->centerRate;
}
}
if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=off*NOTE_PERIODIC(c.value);
}
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if (chan[c.chan].sample<0 || chan[c.chan].sample>=parent->song.sampleLen) {
chan[c.chan].sample=-1;
}
chan[c.chan].audPos=0;
chan[c.chan].audSub=0;
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
}
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chan[c.chan].active=true;
chan[c.chan].keyOn=true;
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chan[c.chan].std.init(ins);
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break;
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}
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case DIV_CMD_NOTE_OFF:
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chan[c.chan].sample=-1;
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chan[c.chan].active=false;
chan[c.chan].keyOff=true;
chan[c.chan].std.init(NULL);
break;
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value || c.value2==1) {
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chan[c.chan].ins=c.value;
}
break;
case DIV_CMD_VOLUME:
if (chan[c.chan].vol!=c.value) {
chan[c.chan].vol=c.value;
if (!chan[c.chan].std.hasVol) {
chan[c.chan].outVol=c.value;
}
}
break;
case DIV_CMD_GET_VOLUME:
if (chan[c.chan].std.hasVol) {
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_WAVE:
chan[c.chan].wave=c.value;
chan[c.chan].keyOn=true;
break;
case DIV_CMD_NOTE_PORTA: {
int destFreq=NOTE_PERIODIC(c.value2);
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bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq+=c.value;
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<=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
}
chan[c.chan].freqChanged=true;
if (return2) {
chan[c.chan].inPorta=false;
return 2;
}
break;
}
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case DIV_CMD_LEGATO: {
double off=1.0;
if (chan[c.chan].sample>=0 && chan[c.chan].sample<parent->song.sampleLen) {
DivSample* s=parent->song.sample[chan[c.chan].sample];
if (s->centerRate<1) {
off=1.0;
} else {
off=8363.0/(double)s->centerRate;
}
}
chan[c.chan].baseFreq=off*NOTE_PERIODIC(c.value+((chan[c.chan].std.willArp && !chan[c.chan].std.arpMode)?(chan[c.chan].std.arp-12):(0)));
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chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
break;
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}
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case DIV_CMD_PRE_PORTA:
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_GET_VOLMAX:
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return 64;
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break;
case DIV_ALWAYS_SET_VOLUME:
return 1;
break;
default:
break;
}
return 1;
}
void DivPlatformAmiga::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
}
void DivPlatformAmiga::forceIns() {
for (int i=0; i<4; i++) {
chan[i].insChanged=true;
chan[i].freqChanged=true;
}
}
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void* DivPlatformAmiga::getChanState(int ch) {
return &chan[ch];
}
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void DivPlatformAmiga::reset() {
for (int i=0; i<4; i++) {
chan[i]=DivPlatformAmiga::Channel();
}
}
bool DivPlatformAmiga::isStereo() {
return true;
}
bool DivPlatformAmiga::keyOffAffectsArp(int ch) {
return true;
}
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void DivPlatformAmiga::notifyInsChange(int ins) {
for (int i=0; i<4; i++) {
if (chan[i].ins==ins) {
chan[i].insChanged=true;
}
}
}
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void DivPlatformAmiga::notifyWaveChange(int wave) {
// TODO when wavetables are added
}
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void DivPlatformAmiga::notifyInsDeletion(void* ins) {
for (int i=0; i<4; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
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void DivPlatformAmiga::setFlags(unsigned int flags) {
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if (flags&1) {
chipClock=COLOR_PAL*4.0/5.0;
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} else {
chipClock=COLOR_NTSC;
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}
rate=chipClock/AMIGA_DIVIDER;
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sep1=((flags>>8)&127)+127;
sep2=127-((flags>>8)&127);
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}
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int DivPlatformAmiga::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
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parent=p;
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dumpWrites=false;
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skipRegisterWrites=false;
for (int i=0; i<4; i++) {
isMuted[i]=false;
}
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setFlags(flags);
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reset();
return 6;
}
void DivPlatformAmiga::quit() {
}