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OPL4: fix use of invalid samples

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issue #2217
This commit is contained in:
tildearrow 2025-06-24 03:46:08 -05:00
parent 6d7a354531
commit 801f5c5720
1 changed files with 36 additions and 31 deletions
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7
src/engine/platform/opl.cpp
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@ -1464,7 +1464,8 @@ void DivPlatformOPL::tick(bool sysTick) {
chan[i].freqL=(chan[i].freq>>chan[i].freqH)&0x3ff;
chan[i].freqH=8^chan[i].freqH;
ctrl|=(chan[i].active?0x80:0)|(chan[i].damp?0x40:0)|(chan[i].lfoReset?0x20:0)|(chan[i].ch?0x10:0)|(isMuted[i]?8:(chan[i].pan&0xf));
unsigned int waveNum=chan[i].sample;
int waveNum=chan[i].sample;
if (waveNum>=0) {
if (ramSize<=0x200000) {
waveNum=CLAMP(waveNum,0,0x7f)|0x180;
}
@ -1497,6 +1498,10 @@ void DivPlatformOPL::tick(bool sysTick) {
immWrite(PCM_ADDR_KEY_DAMP_LFORST_CH_PAN+PCM_REG(i),ctrl);
chan[i].writeCtrl=false;
}
} else {
// cut if we don't have a sample
immWrite(PCM_ADDR_KEY_DAMP_LFORST_CH_PAN+PCM_REG(i),ctrl&~0x80);
}
}
} else {
if (chan[i].freqChanged) {