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better pitch slides

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now digital warmth doesn't choke at the toms
This commit is contained in:
tildearrow 2021-05-19 14:39:39 -05:00
parent 79f15fcbd8
commit 26463fd8d9
4 changed files with 58 additions and 43 deletions
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71
src/engine/platform/genesis.cpp
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@ -74,33 +74,9 @@ void DivPlatformGenesis::tick() {
if (i==2 && extMode) continue;
if (chan[i].freqChanged) {
chan[i].freq=(chan[i].baseFreq*(ONE_SEMITONE+chan[i].pitch))/ONE_SEMITONE;
if (chan[i].freq>=82432) {
chan[i].freqH=((chan[i].freq>>15)&7)|0x38;
chan[i].freqL=(chan[i].freq>>7)&0xff;
} else if (chan[i].freq>=41216) {
chan[i].freqH=((chan[i].freq>>14)&7)|0x30;
chan[i].freqL=(chan[i].freq>>6)&0xff;
} else if (chan[i].freq>=20608) {
chan[i].freqH=((chan[i].freq>>13)&7)|0x28;
chan[i].freqL=(chan[i].freq>>5)&0xff;
} else if (chan[i].freq>=10304) {
chan[i].freqH=((chan[i].freq>>12)&7)|0x20;
chan[i].freqL=(chan[i].freq>>4)&0xff;
} else if (chan[i].freq>=5152) {
chan[i].freqH=((chan[i].freq>>11)&7)|0x18;
chan[i].freqL=(chan[i].freq>>3)&0xff;
} else if (chan[i].freq>=2576) {
chan[i].freqH=((chan[i].freq>>10)&7)|0x10;
chan[i].freqL=(chan[i].freq>>2)&0xff;
} else if (chan[i].freq>=1288) {
chan[i].freqH=((chan[i].freq>>9)&7)|0x08;
chan[i].freqL=(chan[i].freq>>1)&0xff;
} else {
chan[i].freqH=(chan[i].freq>>8)&7;
chan[i].freqL=chan[i].freq&0xff;
}
writes.emplace(chanOffs[i]+0xa4,chan[i].freqH);
writes.emplace(chanOffs[i]+0xa0,chan[i].freqL);
int freqt=toFreq(chan[i].freq);
writes.emplace(chanOffs[i]+0xa4,freqt>>8);
writes.emplace(chanOffs[i]+0xa0,freqt&0xff);
}
if (chan[i].keyOn) {
writes.emplace(0x28,0xf0|konOffs[i]);
@ -132,6 +108,26 @@ int DivPlatformGenesis::octave(int freq) {
return 1;
}
int DivPlatformGenesis::toFreq(int freq) {
if (freq>=82432) {
return 0x3800|((freq>>7)&0x7ff);
} else if (freq>=41216) {
return 0x3000|((freq>>6)&0x7ff);
} else if (freq>=20608) {
return 0x2800|((freq>>5)&0x7ff);
} else if (freq>=10304) {
return 0x2000|((freq>>4)&0x7ff);
} else if (freq>=5152) {
return 0x1800|((freq>>3)&0x7ff);
} else if (freq>=2576) {
return 0x1000|((freq>>2)&0x7ff);
} else if (freq>=1288) {
return 0x800|((freq>>1)&0x7ff);
} else {
return freq&0x7ff;
}
}
int DivPlatformGenesis::dispatch(DivCommand c) {
if (c.chan>5) {
c.chan-=6;
@ -237,20 +233,29 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
}
case DIV_CMD_NOTE_PORTA: {
int destFreq=644.0f*pow(2.0f,((float)c.value2/12.0f));
int newFreq;
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
if (chan[c.chan].baseFreq>=destFreq) {
chan[c.chan].baseFreq=destFreq;
newFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
if (newFreq>=destFreq) {
newFreq=destFreq;
return2=true;
}
} else {
chan[c.chan].baseFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
if (chan[c.chan].baseFreq<=destFreq) {
chan[c.chan].baseFreq=destFreq;
newFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
if (newFreq<=destFreq) {
newFreq=destFreq;
return2=true;
}
}
if (!chan[c.chan].portaPause) {
if (octave(chan[c.chan].baseFreq)!=octave(newFreq)) {
chan[c.chan].portaPause=true;
break;
}
}
chan[c.chan].baseFreq=newFreq;
chan[c.chan].portaPause=false;
chan[c.chan].freqChanged=true;
if (return2) return 2;
break;