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FDS: implement auto-mod

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I don't like it. improvements welcome.
This commit is contained in:
tildearrow 2024-08-02 02:47:55 -05:00
parent f50911ea49
commit 4e7d566791
1 changed files with 11 additions and 1 deletions
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12
src/engine/platform/fds.cpp
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@ -200,6 +200,15 @@ void DivPlatformFDS::tick(bool sysTick) {
}
rWrite(0x4082,chan[i].freq&0xff);
rWrite(0x4083,(chan[i].freq>>8)&15);
if (chan[i].autoModNum>0 && chan[i].autoModDen>0) {
chan[i].modFreq=(chan[i].freq*chan[i].autoModNum)/chan[i].autoModDen;
if (chan[i].modFreq>4095) chan[i].modFreq=4095;
if (chan[i].modFreq<0) chan[i].modFreq=0;
rWrite(0x4086,chan[i].modFreq&0xff);
rWrite(0x4087,chan[i].modFreq>>8);
}
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
@ -346,7 +355,8 @@ int DivPlatformFDS::dispatch(DivCommand c) {
chan[c.chan].autoModNum=c.value>>4;
chan[c.chan].autoModDen=c.value&15;
chan[c.chan].freqChanged=true;
chan[c.chan].modOn=(chan[c.chan].autoModNum || chan[c.chan].autoModDen);
chan[c.chan].modOn=(chan[c.chan].autoModNum && chan[c.chan].autoModDen);
rWrite(0x4084,(chan[c.chan].modOn<<7)|0x40|chan[c.chan].modDepth);
break;
case DIV_CMD_NOTE_PORTA: {
int destFreq=NOTE_FREQUENCY(c.value2);