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implement panning slide and panbrello effects

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tildearrow 2024-07-07 18:55:22 -05:00
parent f09c30a383
commit e6966b68a9
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7
doc/3-pattern/effects.md
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@ -74,6 +74,13 @@ not all chips support these effects.
- `00` is left.
- `80` is center.
- `FF` is right.
- ---
- `83xy`: **Panning slide.**
- if `y` is 0 then this pans to the left by `x` each tick.
- if `x` is 0 then this pans to the right by `y` each tick.
- be noted that panning macros override this effect.
- `84xy`: **Panbrello.** makes panning oscillate. `x` is the speed, while `y` is the depth.
- be noted that panning macros override this effect.
## time

4
src/engine/engine.cpp
View file

@ -83,6 +83,10 @@ const char* DivEngine::getEffectDesc(unsigned char effect, int chan, bool notNul
return _("81xx: Set panning (left channel)");
case 0x82:
return _("82xx: Set panning (right channel)");
case 0x83:
return _("83xy: Panning slide (x0: left; 0y: right)");
case 0x84:
return _("84xy: Panbrello (x: speed; y: depth)");
case 0x88:
return _("88xy: Set panning (rear channels; x: left; y: right)");
break;

5
src/engine/engine.h
View file

@ -137,6 +137,7 @@ struct DivChannelState {
int delayOrder, delayRow, retrigSpeed, retrigTick;
int vibratoDepth, vibratoRate, vibratoPos, vibratoPosGiant, vibratoShape, vibratoFine;
int tremoloDepth, tremoloRate, tremoloPos;
int panDepth, panRate, panPos, panSpeed;
int sampleOff;
unsigned char arp, arpStage, arpTicks, panL, panR, panRL, panRR, lastVibrato, lastPorta, cutType;
bool doNote, legato, portaStop, keyOn, keyOff, nowYouCanStop, stopOnOff, releasing;
@ -174,6 +175,10 @@ struct DivChannelState {
tremoloDepth(0),
tremoloRate(0),
tremoloPos(0),
panDepth(0),
panRate(0),
panPos(0),
panSpeed(0),
sampleOff(0),
arp(0),
arpStage(-1),

95
src/engine/playback.cpp
View file

@ -686,6 +686,31 @@ void DivEngine::processRow(int i, bool afterDelay) {
chan[i].panR=effectVal;
panChanged=true;
break;
case 0x83: // pan slide
if (effectVal!=0) {
if ((effectVal&15)!=0) {
chan[i].panSpeed=(effectVal&15);
} else {
chan[i].panSpeed=(effectVal>>4);
}
// panbrello and slides are incompatible
chan[i].panDepth=0;
chan[i].panRate=0;
chan[i].panPos=0;
} else {
chan[i].panSpeed=0;
}
break;
case 0x84: // panbrello
if (chan[i].panDepth==0) {
chan[i].panPos=0;
}
chan[i].panDepth=effectVal&15;
chan[i].panRate=effectVal>>4;
if (chan[i].panDepth!=0) {
chan[i].panSpeed=0;
}
break;
case 0x88: // panning rear (split 4-bit)
chan[i].panRL=(effectVal>>4)|(effectVal&0xf0);
chan[i].panRR=(effectVal&15)|((effectVal&15)<<4);
@ -1536,11 +1561,14 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
}
// process stuff
if (!shallStop) for (int i=0; i<chans; i++) {
// delay effects
if (chan[i].rowDelay>0) {
if (--chan[i].rowDelay==0) {
processRow(i,true);
}
}
// retrigger
if (chan[i].retrigSpeed) {
if (--chan[i].retrigTick<0) {
chan[i].retrigTick=chan[i].retrigSpeed-1;
@ -1548,6 +1576,8 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
keyHit[i]=true;
}
}
// volume slides and tremolo
if (!song.noSlidesOnFirstTick || !firstTick) {
if (chan[i].volSpeed!=0) {
chan[i].volume=(chan[i].volume&0xff)|(dispatchCmd(DivCommand(DIV_CMD_GET_VOLUME,i))<<8);
@ -1577,6 +1607,63 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
dispatchCmd(DivCommand(DIV_CMD_VOLUME,i,MAX(0,chan[i].volume-(tremTable[chan[i].tremoloPos]*chan[i].tremoloDepth))>>8));
}
}
// panning slides
// TODO: UNTESTED... can't test right now
if (chan[i].panSpeed!=0) {
int newPanL=chan[i].panL;
int newPanR=chan[i].panR;
if (chan[i].panSpeed>0) { // right
if (newPanR>=0xff) {
newPanL-=chan[i].panSpeed;
} else {
newPanR+=chan[i].panSpeed;
}
} else { // left
if (newPanL>=0xff) {
newPanR+=chan[i].panSpeed;
} else {
newPanL-=chan[i].panSpeed;
}
}
if (newPanL<0) newPanL=0;
if (newPanL>0xff) newPanL=0xff;
if (newPanR<0) newPanR=0;
if (newPanR>0xff) newPanR=0xff;
chan[i].panL=newPanL;
chan[i].panR=newPanR;
dispatchCmd(DivCommand(DIV_CMD_PANNING,i,chan[i].panL,chan[i].panR));
} else if (chan[i].panDepth>0) {
chan[i].panPos+=chan[i].panRate;
chan[i].panPos&=255;
// calculate...
switch (chan[i].panPos&0xe0) {
case 0: // center -> right
chan[i].panL=0xff-(chan[i].panPos<<2);
chan[i].panR=0xff;
break;
case 0x40: // right -> center
chan[i].panL=chan[i].panPos<<2;
chan[i].panR=0xff;
break;
case 0x80: // center -> left
chan[i].panL=0xff;
chan[i].panR=0xff-(chan[i].panPos<<2);
break;
case 0xc0: // left -> center
chan[i].panL=0xff;
chan[i].panR=chan[i].panPos<<2;
break;
}
dispatchCmd(DivCommand(DIV_CMD_PANNING,i,chan[i].panL,chan[i].panR));
}
// vibrato
if (chan[i].vibratoDepth>0) {
chan[i].vibratoPos+=chan[i].vibratoRate;
while (chan[i].vibratoPos>=64) chan[i].vibratoPos-=64;
@ -1632,6 +1719,8 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
}
dispatchCmd(DivCommand(DIV_CMD_PITCH,i,chan[i].pitch+(((chan[i].vibratoDepth*vibratoOut*chan[i].vibratoFine)>>4)/15)));
}
// delayed legato
if (chan[i].legatoDelay>0) {
if (--chan[i].legatoDelay<1) {
chan[i].note+=chan[i].legatoTarget;
@ -1641,6 +1730,8 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
chan[i].legatoTarget=0;
}
}
// portamento and pitch slides
if (!song.noSlidesOnFirstTick || !firstTick) {
if ((chan[i].keyOn || chan[i].keyOff) && chan[i].portaSpeed>0) {
if (dispatchCmd(DivCommand(DIV_CMD_NOTE_PORTA,i,chan[i].portaSpeed*(song.linearPitch==2?song.pitchSlideSpeed:1),chan[i].portaNote))==2 && chan[i].portaStop && song.targetResetsSlides) {
@ -1654,6 +1745,8 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
}
}
}
// note cut
if (chan[i].cut>0) {
if (--chan[i].cut<1) {
if (chan[i].cutType==2) {
@ -1688,6 +1781,8 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
}
}
}
// arpeggio
if (chan[i].resetArp) {
dispatchCmd(DivCommand(DIV_CMD_LEGATO,i,chan[i].note));
dispatchCmd(DivCommand(DIV_CMD_HINT_LEGATO,i,chan[i].note));