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Properly case PCM channel

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This commit is contained in:
Natt Akuma 2022-03-08 15:44:14 +07:00
parent a86a7f766b
commit e05052d9d7
1 changed files with 16 additions and 23 deletions
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39
src/engine/platform/vera.cpp
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@ -161,21 +161,11 @@ int DivPlatformVERA::calcNoteFreq(int ch, int note) {
}
void DivPlatformVERA::tick() {
for (int i=0; i<17; i++) {
for (int i=0; i<16; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
if (i<16) {
chan[i].outVol=MAX(chan[i].vol+chan[i].std.vol-63,0);
rWriteLo(i,2,isMuted[i]?0:(chan[i].outVol&63));
} else {
// NB this is currently assuming Amiga instrument type with a 0-64
// (inclusive) volume range. This envelope is then scaled and added to
// the channel volume. Is this a better way to handle this instead of
// making another identical Amiga instrument type but with a 0-15
// volume range?
chan[16].outVol=MAX(chan[16].vol+MIN(chan[16].std.vol/4,15)-15,0);
rWriteFIFOVol(isMuted[16]?0:(chan[16].outVol&15));
}
chan[i].outVol=MAX(chan[i].vol+chan[i].std.vol-63,0);
rWriteLo(i,2,isMuted[i]?0:(chan[i].outVol&63));
}
if (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
@ -192,28 +182,25 @@ void DivPlatformVERA::tick() {
chan[i].freqChanged=true;
}
}
if (chan[i].std.hadDuty && i<16) {
if (chan[i].std.hadDuty) {
rWriteLo(i,3,chan[i].std.duty);
}
if (chan[i].std.hadWave && i<16) {
if (chan[i].std.hadWave) {
rWriteHi(i,3,chan[i].std.wave);
}
if (chan[i].freqChanged) {
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,8);
if (i<16) {
if (chan[i].freq>65535) chan[i].freq=65535;
rWrite(i,0,chan[i].freq&0xff);
rWrite(i,1,(chan[i].freq>>8)&0xff);
} else {
if (chan[i].freq>128) chan[i].freq=128;
rWrite(16,1,chan[i].freq&0xff);
}
if (chan[i].freq>65535) chan[i].freq=65535;
rWrite(i,0,chan[i].freq&0xff);
rWrite(i,1,(chan[i].freq>>8)&0xff);
chan[i].freqChanged=false;
}
}
// PCM
chan[16].std.next();
if (chan[16].std.hadVol) {
chan[16].outVol=MAX(chan[16].vol+MIN(chan[16].std.vol/4,15)-15,0);
rWriteFIFOVol(isMuted[16]?0:(chan[16].outVol&15));
}
if (chan[16].std.hadArp) {
if (!chan[16].inPorta) {
@ -230,6 +217,12 @@ void DivPlatformVERA::tick() {
chan[16].freqChanged=true;
}
}
if (chan[16].freqChanged) {
chan[16].freq=parent->calcFreq(chan[16].baseFreq,chan[16].pitch,false,8);
if (chan[16].freq>128) chan[16].freq=128;
rWrite(16,1,chan[16].freq&0xff);
chan[16].freqChanged=false;
}
}
int DivPlatformVERA::dispatch(DivCommand c) {