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prevent division by zero, part 1

This commit is contained in:
tildearrow 2022-02-15 15:19:36 -05:00
parent 6960112f69
commit b24c572632
4 changed files with 6 additions and 4 deletions
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2
src/engine/engine.cpp
View File

@ -4017,7 +4017,7 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop) {
} }
} }
if (nextToTouch>=0) { if (nextToTouch>=0) {
double waitTime=totalWait+(loopTimer[nextToTouch]*(44100.0/loopFreq[nextToTouch])); double waitTime=totalWait+(loopTimer[nextToTouch]*(44100.0/MIN(1,loopFreq[nextToTouch])));
if (waitTime>0) { if (waitTime>0) {
w->writeC(0x61); w->writeC(0x61);
w->writeS(waitTime); w->writeS(waitTime);

5
src/engine/platform/genesis.cpp
View File

@ -385,7 +385,8 @@ void DivPlatformGenesis::tick() {
off=8363.0/(double)s->centerRate; off=8363.0/(double)s->centerRate;
} }
} }
dacRate=(1280000*1.25*off)/chan[i].baseFreq; dacRate=(1280000*1.25*off)/MIN(1,chan[i].baseFreq);
if (dacRate<1) dacRate=1;
if (dumpWrites) addWrite(0xffff0001,1280000/dacRate); if (dumpWrites) addWrite(0xffff0001,1280000/dacRate);
} }
chan[i].freqChanged=false; chan[i].freqChanged=false;
@ -514,7 +515,7 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
} }
dacPos=0; dacPos=0;
dacPeriod=0; dacPeriod=0;
dacRate=1280000/parent->song.sample[dacSample]->rate; dacRate=1280000/MIN(1,parent->song.sample[dacSample]->rate);
if (dumpWrites) addWrite(0xffff0001,parent->song.sample[dacSample]->rate); if (dumpWrites) addWrite(0xffff0001,parent->song.sample[dacSample]->rate);
chan[c.chan].furnaceDac=false; chan[c.chan].furnaceDac=false;
} }

2
src/engine/platform/pce.cpp
View File

@ -209,7 +209,7 @@ void DivPlatformPCE::tick() {
off=8363.0/(double)s->centerRate; off=8363.0/(double)s->centerRate;
} }
} }
chan[i].dacRate=((double)chipClock/2)/(off*chan[i].freq); chan[i].dacRate=((double)chipClock/2)/MIN(1,off*chan[i].freq);
if (dumpWrites) addWrite(0xffff0001+(i<<8),chan[i].dacRate); if (dumpWrites) addWrite(0xffff0001+(i<<8),chan[i].dacRate);
} }
if (chan[i].freq>4095) chan[i].freq=4095; if (chan[i].freq>4095) chan[i].freq=4095;

1
src/engine/platform/tia.cpp
View File

@ -57,6 +57,7 @@ unsigned char DivPlatformTIA::dealWithFreq(unsigned char shape, int base, int pi
} }
int bp=base+pitch; int bp=base+pitch;
double mult=0.25*(parent->song.tuning*0.0625)*pow(2.0,double(768+bp)/(256.0*12.0)); double mult=0.25*(parent->song.tuning*0.0625)*pow(2.0,double(768+bp)/(256.0*12.0));
if (mult<0.5) mult=0.5;
switch (shape) { switch (shape) {
case 1: // buzzy case 1: // buzzy
return ceil(31400/(30.6*mult))-1; return ceil(31400/(30.6*mult))-1;