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YM2151: implement song tuning

This commit is contained in:
tildearrow 2022-03-23 22:16:25 -05:00
parent 47d7722f6e
commit b292fcc646
1 changed files with 8 additions and 6 deletions
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14
src/engine/platform/arcade.cpp
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@ -52,6 +52,8 @@ static int orderedOps[4]={
#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define NOTE_LINEAR(x) (((x)<<6)+baseFreqOff+log2(parent->song.tuning/440.0)*12.0*64.0)
const char* regCheatSheetOPM[]={
"Test", "00",
"NoteCtl", "08",
@ -234,15 +236,15 @@ void DivPlatformArcade::tick() {
if (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=(chan[i].std.arp<<6)+baseFreqOff;
chan[i].baseFreq=NOTE_LINEAR(chan[i].std.arp);
} else {
chan[i].baseFreq=((chan[i].note+(signed char)chan[i].std.arp)<<6)+baseFreqOff;
chan[i].baseFreq=NOTE_LINEAR(chan[i].note+(signed char)chan[i].std.arp);
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
chan[i].baseFreq=(chan[i].note<<6)+baseFreqOff;
chan[i].baseFreq=NOTE_LINEAR(chan[i].note);
chan[i].freqChanged=true;
}
}
@ -446,7 +448,7 @@ int DivPlatformArcade::dispatch(DivCommand c) {
chan[c.chan].insChanged=false;
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=(c.value<<6)+baseFreqOff;
chan[c.chan].baseFreq=NOTE_LINEAR(c.value);
chan[c.chan].note=c.value;
chan[c.chan].freqChanged=true;
}
@ -510,7 +512,7 @@ int DivPlatformArcade::dispatch(DivCommand c) {
break;
}
case DIV_CMD_NOTE_PORTA: {
int destFreq=(c.value2<<6)+baseFreqOff;
int destFreq=NOTE_LINEAR(c.value2);
int newFreq;
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
@ -535,7 +537,7 @@ int DivPlatformArcade::dispatch(DivCommand c) {
break;
}
case DIV_CMD_LEGATO: {
chan[c.chan].baseFreq=(c.value<<6)+baseFreqOff;
chan[c.chan].baseFreq=NOTE_LINEAR(c.value);
chan[c.chan].freqChanged=true;
break;
}