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YM2610(B): use f-num/block baseFreq calculation

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also allow for different octave boundary f-nums depending on chip clock
This commit is contained in:
tildearrow 2022-05-10 02:22:08 -05:00
parent da71a6a804
commit 5e14177e4e
12 changed files with 198 additions and 170 deletions
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10
src/engine/platform/genesis.cpp
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@ -725,6 +725,8 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
}
break;
}
int boundaryBottom=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,0,false);
int boundaryTop=parent->calcBaseFreq(chipClock,CHIP_FREQBASE,12,false);
int destFreq=NOTE_FNUM_BLOCK(c.value2,11);
int newFreq;
bool return2=false;
@ -747,13 +749,13 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
// check for octave boundary
// what the heck!
if (!chan[c.chan].portaPause) {
if ((newFreq&0x7ff)>1288 && (newFreq&0xf800)<0x3800) {
chan[c.chan].portaPauseFreq=(644)|((newFreq+0x800)&0xf800);
if ((newFreq&0x7ff)>boundaryTop && (newFreq&0xf800)<0x3800) {
chan[c.chan].portaPauseFreq=(boundaryBottom)|((newFreq+0x800)&0xf800);
chan[c.chan].portaPause=true;
break;
}
if ((newFreq&0x7ff)<644 && (newFreq&0xf800)>0) {
chan[c.chan].portaPauseFreq=newFreq=(1287)|((newFreq-0x800)&0xf800);
if ((newFreq&0x7ff)<boundaryBottom && (newFreq&0xf800)>0) {
chan[c.chan].portaPauseFreq=newFreq=(boundaryTop-1)|((newFreq-0x800)&0xf800);
chan[c.chan].portaPause=true;
break;
}