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TIA: absolute arp macros are now periodic

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tildearrow 2022-01-14 15:34:54 -05:00
parent c23ba3b532
commit 390eb66647
1 changed files with 5 additions and 2 deletions
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7
src/engine/platform/tia.cpp
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@ -10,6 +10,9 @@ void DivPlatformTIA::acquire(short* bufL, short* bufR, size_t start, size_t len)
} }
unsigned char dealWithFreq(unsigned char shape, int base, int pitch) { unsigned char dealWithFreq(unsigned char shape, int base, int pitch) {
if (base&0x80000000 && ((base&0x7fffffff)<32)) {
return base&0x1f;
}
int bp=base+pitch; int bp=base+pitch;
double mult=0.25*27.5*pow(2.0,double(768+bp)/(256.0*12.0)); double mult=0.25*27.5*pow(2.0,double(768+bp)/(256.0*12.0));
switch (shape) { switch (shape) {
@ -53,7 +56,7 @@ void DivPlatformTIA::tick() {
if (chan[i].std.hadArp) { if (chan[i].std.hadArp) {
if (!chan[i].inPorta) { if (!chan[i].inPorta) {
if (chan[i].std.arpMode) { if (chan[i].std.arpMode) {
chan[i].baseFreq=chan[i].std.arp<<8; chan[i].baseFreq=0x80000000|chan[i].std.arp;
} else { } else {
chan[i].baseFreq=(chan[i].note+chan[i].std.arp-12)<<8; chan[i].baseFreq=(chan[i].note+chan[i].std.arp-12)<<8;
} }
@ -79,7 +82,7 @@ void DivPlatformTIA::tick() {
chan[i].insChanged=false; chan[i].insChanged=false;
} }
chan[i].freq=dealWithFreq(chan[i].shape,chan[i].baseFreq,chan[i].pitch); chan[i].freq=dealWithFreq(chan[i].shape,chan[i].baseFreq,chan[i].pitch);
if (chan[i].shape==4 || chan[i].shape==5) { if ((chan[i].shape==4 || chan[i].shape==5) && !(chan[i].baseFreq&0x80000000 && ((chan[i].baseFreq&0x7fffffff)<32))) {
if (chan[i].baseFreq<39*256) { if (chan[i].baseFreq<39*256) {
rWrite(0x15+i,6); rWrite(0x15+i,6);
chan[i].freq=dealWithFreq(6,chan[i].baseFreq,chan[i].pitch); chan[i].freq=dealWithFreq(6,chan[i].baseFreq,chan[i].pitch);