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add auto-envelope mode (29xy effect)

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this closes #32
This commit is contained in:
tildearrow 2022-01-20 03:23:03 -05:00
parent 04240ffa46
commit 75ce5f4e2a
11 changed files with 64 additions and 8 deletions
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10
src/engine/platform/ay8930.cpp
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@ -108,6 +108,11 @@ void DivPlatformAY8930::tick() {
rWrite(1+((i)<<1),chan[i].freq>>8);
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
if (chan[i].freqChanged && chan[i].autoEnvNum>0 && chan[i].autoEnvDen>0) {
ayEnvPeriod[i]=(chan[i].freq*chan[i].autoEnvDen/chan[i].autoEnvNum)>>4;
immWrite(regPeriodL[i],ayEnvPeriod[i]);
immWrite(regPeriodH[i],ayEnvPeriod[i]>>8);
}
chan[i].freqChanged=false;
}
@ -281,6 +286,11 @@ int DivPlatformAY8930::dispatch(DivCommand c) {
ayNoiseOr=c.value;
immWrite(0x1a,ayNoiseOr);
break;
case DIV_CMD_AY_AUTO_ENVELOPE:
chan[c.chan].autoEnvNum=c.value>>4;
chan[c.chan].autoEnvDen=c.value&15;
chan[c.chan].freqChanged=true;
break;
case DIV_ALWAYS_SET_VOLUME:
return 0;
break;