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attempt to fix the volume slide mess

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also a fix to noise arps in basic mode in SMS

the volume slides will be an adventure as the behavior seems to be hard
to determine
This commit is contained in:
tildearrow 2021-05-17 03:06:45 -05:00
parent 53975349e5
commit 67847d79cf
6 changed files with 69 additions and 18 deletions
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32
src/engine/platform/sms.cpp
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@ -12,7 +12,10 @@ void DivPlatformSMS::acquire(int& l, int& r) {
void DivPlatformSMS::tick() {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) sn->write(0x90|(i<<5)|(15-((chan[i].vol*chan[i].std.vol)>>4)));
if (chan[i].std.hadVol) {
chan[i].outVol=(chan[i].vol*chan[i].std.vol)>>4;
sn->write(0x90|(i<<5)|(15-chan[i].outVol));
}
if (chan[i].std.hadArp) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=round(1712.0f/pow(2.0f,((float)(chan[i].std.arp)/12.0f)));
@ -53,10 +56,20 @@ void DivPlatformSMS::tick() {
sn->write(0xc0|(chan[3].freq&15));
sn->write(chan[3].freq>>4);
} else { // 3 fixed values
unsigned char value=chan[3].note%12;
if (value>2) value=2;
value=2-value;
sn->write(0xe0|value|((snNoiseMode&1)<<2));
unsigned char value;
if (chan[3].std.hadArp) {
if (chan[3].std.arpMode) {
value=chan[3].std.arp%12;
} else {
value=(chan[3].note+chan[3].std.arp)%12;
}
} else {
value=chan[3].note%12;
}
if (value<3) {
value=2-value;
sn->write(0xe0|value|((snNoiseMode&1)<<2));
}
}
}
}
@ -83,9 +96,18 @@ int DivPlatformSMS::dispatch(DivCommand c) {
case DIV_CMD_VOLUME:
if (chan[c.chan].vol!=c.value) {
chan[c.chan].vol=c.value;
if (!chan[c.chan].std.hasVol) {
chan[c.chan].outVol=c.value;
}
sn->write(0x90|c.chan<<5|(15-chan[c.chan].vol));
}
break;
case DIV_CMD_GET_VOLUME:
if (chan[c.chan].std.hasVol) {
return chan[c.chan].vol;
}
return chan[c.chan].outVol;
break;
case DIV_CMD_PITCH:
chan[c.chan].pitch=c.value;
chan[c.chan].freqChanged=true;