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Game Boy: software envelopes, part 2

This commit is contained in:
tildearrow 2022-08-10 17:02:45 -05:00
parent bccecc4c07
commit 4b18d0920b
1 changed files with 9 additions and 4 deletions
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13
src/engine/platform/gb.cpp
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@ -166,7 +166,10 @@ void DivPlatformGB::tick(bool sysTick) {
if (chan[i].outVol<0) chan[i].outVol=0;
// temporary until zombie mode is implemented
chan[i].vol=chan[i].outVol;
chan[i].envLen=0;
chan[i].envDir=0;
chan[i].envVol=chan[i].outVol;
chan[i].soundLen=64;
chan[i].keyOn=true;
}
}
@ -314,10 +317,10 @@ void DivPlatformGB::tick(bool sysTick) {
if (chan[i].keyOn) {
if (i==2) { // wave
rWrite(16+i*5,0x80);
rWrite(16+i*5+2,gbVolMap[chan[i].vol]);
rWrite(16+i*5+2,gbVolMap[chan[i].outVol]);
} else {
rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(chan[i].soundLen&63)));
rWrite(16+i*5+2,((chan[i].vol<<4))|(chan[i].envLen&7)|((chan[i].envDir&1)<<3));
rWrite(16+i*5+2,((chan[i].envVol<<4))|(chan[i].envLen&7)|((chan[i].envDir&1)<<3));
}
}
if (chan[i].keyOff) {
@ -406,6 +409,7 @@ int DivPlatformGB::dispatch(DivCommand c) {
chan[c.chan].envDir=ins->gb.envDir;
chan[c.chan].soundLen=ins->gb.soundLen;
chan[c.chan].vol=chan[c.chan].envVol;
chan[c.chan].outVol=chan[c.chan].vol;
if (parent->song.gbInsAffectsEnvelope) {
rWrite(16+c.chan*5+2,((chan[c.chan].vol<<4))|(chan[c.chan].envLen&7)|((chan[c.chan].envDir&1)<<3));
}
@ -415,8 +419,9 @@ int DivPlatformGB::dispatch(DivCommand c) {
break;
case DIV_CMD_VOLUME:
chan[c.chan].vol=c.value;
chan[c.chan].outVol=c.value;
if (c.chan==2) {
rWrite(16+c.chan*5+2,gbVolMap[chan[c.chan].vol]);
rWrite(16+c.chan*5+2,gbVolMap[chan[c.chan].outVol]);
}
break;
case DIV_CMD_GET_VOLUME: