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implement several effects

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volume slides, vibrato, slides and portamento
This commit is contained in:
tildearrow 2021-05-14 14:16:48 -05:00
parent 775b88dae2
commit eb692ca9a9
6 changed files with 82 additions and 16 deletions
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31
src/engine/playback.cpp
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@ -107,7 +107,7 @@ void DivEngine::nextRow() {
dispatch->dispatch(DivCommand(DIV_CMD_NOTE_OFF,i));
} else if (!(pat->data[curRow][0]==0 && pat->data[curRow][1]==0)) {
chan[i].note=pat->data[curRow][0]+pat->data[curRow][1]*12;
dispatch->dispatch(DivCommand(DIV_CMD_NOTE_ON,i,chan[i].note));
chan[i].doNote=true;
}
// volume
@ -118,8 +118,8 @@ void DivEngine::nextRow() {
// effects
for (int j=0; j<song.pat[i]->effectRows; j++) {
unsigned char effect=pat->data[curRow][4+(j<<1)];
unsigned char effectVal=pat->data[curRow][5+(j<<1)];
short effect=pat->data[curRow][4+(j<<1)];
short effectVal=pat->data[curRow][5+(j<<1)];
if (effectVal==-1) effectVal=0;
@ -147,7 +147,7 @@ void DivEngine::nextRow() {
chan[i].portaNote=-1;
chan[i].portaSpeed=-1;
} else {
chan[i].portaNote=0x7f;
chan[i].portaNote=0x60;
chan[i].portaSpeed=effectVal;
}
break;
@ -167,11 +167,13 @@ void DivEngine::nextRow() {
} else {
chan[i].portaNote=chan[i].note;
chan[i].portaSpeed=effectVal;
chan[i].doNote=false;
}
break;
case 0x04: // vibrato
chan[i].vibratoDepth=effectVal&15;
chan[i].vibratoRate=effectVal>>4;
dispatch->dispatch(DivCommand(DIV_CMD_PITCH,i,(chan[i].vibratoDepth*vibTable[chan[i].vibratoPos])>>4));
break;
case 0x0a: // volume ramp
if (effectVal!=0) {
@ -187,17 +189,24 @@ void DivEngine::nextRow() {
case 0xe1: // portamento up
chan[i].portaNote=chan[i].note+(effectVal&15);
chan[i].portaSpeed=effectVal>>4;
chan[i].portaSpeed=(effectVal>>4)*3;
break;
case 0xe2: // portamento down
chan[i].portaNote=chan[i].note-(effectVal&15);
chan[i].portaSpeed=effectVal>>4;
chan[i].portaSpeed=(effectVal>>4)*3;
break;
case 0xe5: // pitch
chan[i].pitch=effectVal-0x80;
break;
}
}
if (chan[i].doNote) {
chan[i].vibratoPos=0;
dispatch->dispatch(DivCommand(DIV_CMD_PITCH,i,(chan[i].vibratoDepth*vibTable[chan[i].vibratoPos])>>2));
dispatch->dispatch(DivCommand(DIV_CMD_NOTE_ON,i,chan[i].note));
chan[i].doNote=false;
}
}
}
@ -228,6 +237,16 @@ void DivEngine::nextTick() {
if (chan[i].volume<0) chan[i].volume=0;
dispatch->dispatch(DivCommand(DIV_CMD_VOLUME,i,chan[i].volume>>8));
}
if (chan[i].vibratoDepth>0) {
chan[i].vibratoPos+=chan[i].vibratoRate;
if (chan[i].vibratoPos>=60) chan[i].vibratoPos-=60;
dispatch->dispatch(DivCommand(DIV_CMD_PITCH,i,(chan[i].vibratoDepth*vibTable[chan[i].vibratoPos])>>4));
}
if (chan[i].portaSpeed>0) {
if (dispatch->dispatch(DivCommand(DIV_CMD_NOTE_PORTA,i,chan[i].portaSpeed,chan[i].portaNote))==2) {
chan[i].portaSpeed=0;
}
}
}
// system tick