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add effects to change virtual tempo

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tildearrow 2024-03-15 14:56:55 -05:00
parent 779d1aeb61
commit 3512591fd1
7 changed files with 50 additions and 8 deletions
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16
src/engine/playback.cpp
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@ -487,6 +487,12 @@ void DivEngine::processRow(int i, bool afterDelay) {
if (effectVal>0) speeds.val[0]=effectVal;
}
break;
case 0xfd: // virtual tempo num
if (effectVal>0) virtualTempoN=effectVal;
break;
case 0xfe: // virtual tempo den
if (effectVal>0) virtualTempoD=effectVal;
break;
case 0x0b: // change order
if (changeOrd==-1 || song.jumpTreatment==0) {
changeOrd=effectVal;
@ -1442,9 +1448,9 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
subticks=tickMult;
if (stepPlay!=1) {
tempoAccum+=(skipping && curSubSong->virtualTempoN<curSubSong->virtualTempoD)?curSubSong->virtualTempoD:curSubSong->virtualTempoN;
while (tempoAccum>=curSubSong->virtualTempoD) {
tempoAccum-=curSubSong->virtualTempoD;
tempoAccum+=(skipping && virtualTempoN<virtualTempoD)?virtualTempoD:virtualTempoN;
while (tempoAccum>=virtualTempoD) {
tempoAccum-=virtualTempoD;
if (--ticks<=0) {
ret=endOfSong;
if (shallStopSched) {
@ -1693,7 +1699,7 @@ void DivEngine::runMidiClock(int totalCycles) {
if (hl<=0.0) hl=4.0;
double timeBase=curSubSong->timeBase+1;
double speedSum=0;
double vD=curSubSong->virtualTempoD;
double vD=virtualTempoD;
for (int i=0; i<MIN(16,speeds.len); i++) {
speedSum+=speeds.val[i];
}
@ -1701,7 +1707,7 @@ void DivEngine::runMidiClock(int totalCycles) {
if (timeBase<1.0) timeBase=1.0;
if (speedSum<1.0) speedSum=1.0;
if (vD<1) vD=1;
double bpm=((24.0*divider)/(timeBase*hl*speedSum))*(double)curSubSong->virtualTempoN/vD;
double bpm=((24.0*divider)/(timeBase*hl*speedSum))*(double)virtualTempoN/vD;
if (bpm<1.0) bpm=1.0;
int increment=got.rate*pow(2,MASTER_CLOCK_PREC)/(bpm);