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AY8930: finally implement auto noise freq

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This commit is contained in:
tildearrow 2024-05-07 02:31:22 -05:00
parent c2565b1300
commit f64adfa8dd
3 changed files with 35 additions and 3 deletions
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29
src/engine/platform/ay8930.cpp
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@ -362,6 +362,29 @@ void DivPlatformAY8930::tick(bool sysTick) {
immWrite(regPeriodL[i],chan[i].envelope.period);
immWrite(regPeriodH[i],chan[i].envelope.period>>8);
}
if (chan[i].freqChanged && chan[i].autoNoiseMode) {
int noiseFreq=chan[i].freq;
switch (chan[i].autoNoiseMode) {
case 1: // noise
noiseFreq+=chan[i].autoNoiseOff;
if (noiseFreq<0) noiseFreq=0;
if (noiseFreq>255) noiseFreq=255;
rWrite(0x06,noiseFreq);
break;
case 2: { // noise + OR mask
if (noiseFreq<0) noiseFreq=0;
int noiseDiv=(noiseFreq>>8)+1;
noiseFreq/=noiseDiv;
ayNoiseOr=noiseDiv;
immWrite(0x1a,ayNoiseOr);
noiseFreq+=chan[i].autoNoiseOff;
if (noiseFreq<0) noiseFreq=0;
if (noiseFreq>255) noiseFreq=255;
rWrite(0x06,noiseFreq);
break;
}
}
}
chan[i].freqChanged=false;
}
@ -632,6 +655,12 @@ int DivPlatformAY8930::dispatch(DivCommand c) {
chan[c.chan].autoEnvDen=c.value&15;
chan[c.chan].freqChanged=true;
break;
case DIV_CMD_AY_AUTO_PWM:
chan[c.chan].autoNoiseMode=c.value>>4;
chan[c.chan].autoNoiseOff=c.value&15;
if (chan[c.chan].autoNoiseOff>=8) chan[c.chan].autoNoiseOff-=16;
chan[c.chan].freqChanged=true;
break;
case DIV_CMD_AY_IO_WRITE:
if (c.value==255) {
immWrite(0x1f,c.value2);