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TIA: finally fix negative octaves 

issue #44
This commit is contained in:
tildearrow 2023-02-06 15:24:37 -05:00
parent 0ab448350b
commit 79ede020cf
1 changed files with 15 additions and 28 deletions
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43
src/engine/platform/tia.cpp
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@ -58,36 +58,38 @@ void DivPlatformTIA::acquire(short** buf, size_t len) {
}
unsigned char DivPlatformTIA::dealWithFreq(unsigned char shape, int base, int pitch) {
if (base&0x80000000 && ((base&0x7fffffff)<32)) {
return base&0x1f;
}
int bp=base+pitch;
double mult=0.25*(parent->song.tuning*0.0625)*pow(2.0,double(768+bp)/(256.0*12.0));
if (mult<0.5) mult=0.5;
int ret=0;
switch (shape) {
case 1: // buzzy
return ceil(31400/(30.6*mult))-1;
ret=ceil(31400/(30.6*mult))-1;
break;
case 2: // low buzzy
return ceil(31400/(480*mult))-1;
ret=ceil(31400/(480*mult))-1;
break;
case 3: // flangy
return ceil(31400/(60*mult))-1;
ret=ceil(31400/(60*mult))-1;
break;
case 4: case 5: // square
return ceil(31400/(4.05*mult))-1;
ret=ceil(31400/(4.05*mult))-1;
break;
case 6: case 7: case 8: case 9: case 10: // pure buzzy/reedy/noise
return ceil(31400/(63*mult))-1;
ret=ceil(31400/(63*mult))-1;
break;
case 12: case 13: // low square
return round(31400/(4.0*3*mult))-1;
ret=round(31400/(4.0*3*mult))-1;
break;
case 14: case 15: // low pure buzzy/reedy
return ceil(31400/(3*63*mult))-1;
ret=ceil(31400/(3*63*mult))-1;
break;
}
return 0;
if (ret<0) ret=0;
if (ret>31) ret=31;
return ret;
}
void DivPlatformTIA::tick(bool sysTick) {
@ -102,21 +104,7 @@ void DivPlatformTIA::tick(bool sysTick) {
rWrite(0x19+i,chan[i].outVol&15);
}
}
// TODO: the way arps work on TIA is really weird
if (NEW_ARP_STRAT) {
chan[i].handleArp();
} else if (chan[i].std.arp.had) {
if (!chan[i].inPorta) {
if (chan[i].std.arp.val<0 && (!(chan[i].std.arp.val&0x40000000))) {
chan[i].baseFreq=0x80000000|(chan[i].std.arp.val|0x40000000);
} else if (chan[i].std.arp.val>=0 && chan[i].std.arp.val&0x40000000) {
chan[i].baseFreq=0x80000000|(chan[i].std.arp.val&(~0x40000000));
} else {
chan[i].baseFreq=(chan[i].note+chan[i].std.arp.val)<<8;
}
}
chan[i].freqChanged=true;
}
chan[i].handleArp();
if (chan[i].std.wave.had) {
chan[i].shape=chan[i].std.wave.val&15;
rWrite(0x15+i,chan[i].shape);
@ -142,7 +130,7 @@ void DivPlatformTIA::tick(bool sysTick) {
chan[i].freq=chan[i].baseNoteOverride&31;
} else {
chan[i].freq=dealWithFreq(chan[i].shape,bf,chan[i].pitch+chan[i].pitch2);
if ((chan[i].shape==4 || chan[i].shape==5) && !(chan[i].baseFreq&0x80000000 && ((chan[i].baseFreq&0x7fffffff)<32))) {
if (chan[i].shape==4 || chan[i].shape==5) {
if (bf<39*256) {
rWrite(0x15+i,6);
chan[i].freq=dealWithFreq(6,bf,chan[i].pitch+chan[i].pitch2);
@ -282,7 +270,6 @@ int DivPlatformTIA::dispatch(DivCommand c) {
if (chan[c.chan].active && c.value2) {
if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_TIA));
}
if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=(chan[c.chan].note<<8);
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_PRE_NOTE: