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https://github.com/tildearrow/furnace.git
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new FM frequency calculation experiments
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tildearrow
parent
9c8d122389
commit
8db53faf72
4 changed files with 51 additions and 97 deletions
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@ -426,6 +426,7 @@ class DivDispatch {
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#define NOTE_PERIODIC(x) round(parent->calcBaseFreq(chipClock,CHIP_DIVIDER,x,true))
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#define NOTE_PERIODIC_NOROUND(x) parent->calcBaseFreq(chipClock,CHIP_DIVIDER,x,true)
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#define NOTE_FREQUENCY(x) parent->calcBaseFreq(chipClock,CHIP_FREQBASE,x,false)
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#define NOTE_FNUM_BLOCK(x,bits) ((((int)parent->calcBaseFreq(chipClock,CHIP_FREQBASE,(x)%12,false))&((1<<bits)-1))|((MAX(x,0)/12)<<bits))
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#define COLOR_NTSC (315000000.0/88.0)
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#define COLOR_PAL (283.75*15625.0+25.0)
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@ -245,15 +245,15 @@ void DivPlatformGenesis::tick(bool sysTick) {
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if (chan[i].std.arp.had) {
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if (!chan[i].inPorta) {
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if (chan[i].std.arp.mode) {
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chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp.val);
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chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].std.arp.val,11);
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} else {
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chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+(signed char)chan[i].std.arp.val);
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chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note+(signed char)chan[i].std.arp.val,11);
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}
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}
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chan[i].freqChanged=true;
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} else {
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if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
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chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note);
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chan[i].baseFreq=NOTE_FNUM_BLOCK(chan[i].note,11);
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chan[i].freqChanged=true;
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}
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}
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@ -394,9 +394,9 @@ void DivPlatformGenesis::tick(bool sysTick) {
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for (int i=0; i<6; i++) {
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if (i==2 && extMode) continue;
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if (chan[i].freqChanged) {
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chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,octave(chan[i].baseFreq));
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if (chan[i].freq>262143) chan[i].freq=262143;
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int freqt=toFreq(chan[i].freq)+chan[i].std.pitch.val;
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chan[i].freq=((chan[i].baseFreq&0xf800)|parent->calcFreq(chan[i].baseFreq&0x7ff,chan[i].pitch,false))+chan[i].std.pitch.val;
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if (chan[i].freq>65535) chan[i].freq=65535;
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int freqt=chan[i].freq;
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immWrite(chanOffs[i]+ADDR_FREQH,freqt>>8);
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immWrite(chanOffs[i]+ADDR_FREQ,freqt&0xff);
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if (chan[i].furnaceDac && dacMode) {
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@ -422,47 +422,6 @@ void DivPlatformGenesis::tick(bool sysTick) {
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}
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}
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int DivPlatformGenesis::octave(int freq) {
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if (freq>=82432) {
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return 128;
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} else if (freq>=41216) {
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return 64;
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} else if (freq>=20608) {
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return 32;
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} else if (freq>=10304) {
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return 16;
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} else if (freq>=5152) {
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return 8;
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} else if (freq>=2576) {
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return 4;
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} else if (freq>=1288) {
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return 2;
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} else {
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return 1;
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}
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return 1;
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}
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int DivPlatformGenesis::toFreq(int freq) {
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if (freq>=82432) {
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return 0x3800|((freq>>7)&0x7ff);
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} else if (freq>=41216) {
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return 0x3000|((freq>>6)&0x7ff);
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} else if (freq>=20608) {
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return 0x2800|((freq>>5)&0x7ff);
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} else if (freq>=10304) {
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return 0x2000|((freq>>4)&0x7ff);
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} else if (freq>=5152) {
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return 0x1800|((freq>>3)&0x7ff);
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} else if (freq>=2576) {
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return 0x1000|((freq>>2)&0x7ff);
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} else if (freq>=1288) {
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return 0x800|((freq>>1)&0x7ff);
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} else {
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return freq&0x7ff;
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}
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}
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void DivPlatformGenesis::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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for (int j=0; j<4; j++) {
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@ -509,7 +468,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
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dacPos=0;
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dacPeriod=0;
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
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chan[c.chan].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
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chan[c.chan].freqChanged=true;
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}
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chan[c.chan].furnaceDac=true;
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@ -576,7 +535,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
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chan[c.chan].insChanged=false;
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if (c.value!=DIV_NOTE_NULL) {
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chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
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chan[c.chan].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
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chan[c.chan].portaPause=false;
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chan[c.chan].note=c.value;
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chan[c.chan].freqChanged=true;
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@ -656,26 +615,33 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
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break;
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}
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case DIV_CMD_NOTE_PORTA: {
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int destFreq=NOTE_FREQUENCY(c.value2);
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int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
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int newFreq;
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bool return2=false;
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if (destFreq>chan[c.chan].baseFreq) {
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newFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
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newFreq=chan[c.chan].baseFreq+c.value;
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if (newFreq>=destFreq) {
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newFreq=destFreq;
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return2=true;
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}
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} else {
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newFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
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newFreq=chan[c.chan].baseFreq-c.value;
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if (newFreq<=destFreq) {
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newFreq=destFreq;
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return2=true;
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}
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}
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// check for octave boundary
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if (!chan[c.chan].portaPause) {
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if (octave(chan[c.chan].baseFreq)!=octave(newFreq)) {
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chan[c.chan].portaPause=true;
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break;
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if ((newFreq&0x7ff)>1288) {
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newFreq=((newFreq&0x7ff)>>1)|((newFreq+0x800)&0xf800);
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/*chan[c.chan].portaPause=true;
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break;*/
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}
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if ((newFreq&0x7ff)<644) {
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newFreq=(newFreq&0x7ff)<<1|((newFreq-0x800)&0xf800);
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/*chan[c.chan].portaPause=true;
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break;*/
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}
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}
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chan[c.chan].baseFreq=newFreq;
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@ -699,7 +665,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
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}
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break;
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case DIV_CMD_LEGATO: {
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chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value);
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chan[c.chan].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
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chan[c.chan].note=c.value;
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chan[c.chan].freqChanged=true;
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break;
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@ -93,9 +93,6 @@ class DivPlatformGenesis: public DivDispatch {
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short oldWrites[512];
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short pendingWrites[512];
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int octave(int freq);
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int toFreq(int freq);
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friend void putDispatchChan(void*,int,int);
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void acquire_nuked(short* bufL, short* bufR, size_t start, size_t len);
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@ -72,7 +72,7 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
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opChan[ch].insChanged=false;
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if (c.value!=DIV_NOTE_NULL) {
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opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
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opChan[ch].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
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opChan[ch].portaPause=false;
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opChan[ch].freqChanged=true;
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}
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@ -127,31 +127,46 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
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break;
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}
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case DIV_CMD_NOTE_PORTA: {
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int destFreq=NOTE_FREQUENCY(c.value2);
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int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
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int newFreq;
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bool return2=false;
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if (destFreq>opChan[ch].baseFreq) {
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newFreq=opChan[ch].baseFreq+c.value*octave(opChan[ch].baseFreq);
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newFreq=opChan[ch].baseFreq+c.value;
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if (newFreq>=destFreq) {
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newFreq=destFreq;
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return2=true;
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}
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} else {
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newFreq=opChan[ch].baseFreq-c.value*octave(opChan[ch].baseFreq);
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newFreq=opChan[ch].baseFreq-c.value;
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if (newFreq<=destFreq) {
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newFreq=destFreq;
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return2=true;
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}
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}
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if (!opChan[ch].portaPause) {
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if (octave(opChan[ch].baseFreq)!=octave(newFreq)) {
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opChan[ch].freqChanged=true;
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if ((newFreq&0x7ff)>1288) {
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newFreq=((newFreq&0x7ff)>>1)|((newFreq+0x800)&0xf800);
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opChan[ch].portaPause=true;
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break;
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opChan[ch].freqChanged=false;
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return2=false;
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if (ch==3) printf("%d: upper bound\n",ch);
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//break;
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}
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if ((newFreq&0x7ff)<644) {
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newFreq=(newFreq&0x7ff)<<1|((newFreq-0x800)&0xf800);
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opChan[ch].portaPause=true;
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opChan[ch].freqChanged=false;
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return2=false;
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if (ch==3) printf("%d: lower bound\n",ch);
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//break;
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}
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} else {
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opChan[ch].portaPause=false;
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opChan[ch].freqChanged=true;
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}
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if (ch==3) printf("%d: writing %.4x to freq\n",ch,newFreq);
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opChan[ch].baseFreq=newFreq;
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opChan[ch].portaPause=false;
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opChan[ch].freqChanged=true;
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if (return2) return 2;
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break;
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}
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@ -172,7 +187,7 @@ int DivPlatformGenesisExt::dispatch(DivCommand c) {
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}
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break;
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case DIV_CMD_LEGATO: {
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opChan[ch].baseFreq=NOTE_FREQUENCY(c.value);
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opChan[ch].baseFreq=NOTE_FNUM_BLOCK(c.value,11);
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opChan[ch].freqChanged=true;
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break;
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}
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@ -289,35 +304,10 @@ void DivPlatformGenesisExt::tick(bool sysTick) {
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unsigned char writeMask=2;
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if (extMode) for (int i=0; i<4; i++) {
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if (opChan[i].freqChanged) {
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opChan[i].freq=parent->calcFreq(opChan[i].baseFreq,opChan[i].pitch);
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if (opChan[i].freq>262143) opChan[i].freq=262143;
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if (opChan[i].freq>=82432) {
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opChan[i].freqH=((opChan[i].freq>>15)&7)|0x38;
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opChan[i].freqL=(opChan[i].freq>>7)&0xff;
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} else if (opChan[i].freq>=41216) {
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opChan[i].freqH=((opChan[i].freq>>14)&7)|0x30;
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opChan[i].freqL=(opChan[i].freq>>6)&0xff;
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} else if (opChan[i].freq>=20608) {
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opChan[i].freqH=((opChan[i].freq>>13)&7)|0x28;
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opChan[i].freqL=(opChan[i].freq>>5)&0xff;
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} else if (opChan[i].freq>=10304) {
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opChan[i].freqH=((opChan[i].freq>>12)&7)|0x20;
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opChan[i].freqL=(opChan[i].freq>>4)&0xff;
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} else if (opChan[i].freq>=5152) {
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opChan[i].freqH=((opChan[i].freq>>11)&7)|0x18;
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opChan[i].freqL=(opChan[i].freq>>3)&0xff;
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} else if (opChan[i].freq>=2576) {
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opChan[i].freqH=((opChan[i].freq>>10)&7)|0x10;
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opChan[i].freqL=(opChan[i].freq>>2)&0xff;
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} else if (opChan[i].freq>=1288) {
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opChan[i].freqH=((opChan[i].freq>>9)&7)|0x08;
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opChan[i].freqL=(opChan[i].freq>>1)&0xff;
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} else {
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opChan[i].freqH=(opChan[i].freq>>8)&7;
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opChan[i].freqL=opChan[i].freq&0xff;
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}
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immWrite(opChanOffsH[i],opChan[i].freqH);
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immWrite(opChanOffsL[i],opChan[i].freqL);
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opChan[i].freq=(opChan[i].baseFreq&0xf800)|parent->calcFreq(opChan[i].baseFreq&0x7ff,opChan[i].pitch);
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if (chan[i].freq>65535) chan[i].freq=65535;
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immWrite(opChanOffsH[i],opChan[i].freq>>8);
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immWrite(opChanOffsL[i],opChan[i].freq&0xff);
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}
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writeMask|=opChan[i].active<<(4+i);
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if (opChan[i].keyOn) {
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