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Game Boy: software envelopes, part 1

This commit is contained in:
tildearrow 2022-08-10 16:27:29 -05:00
parent 6bcb3063a5
commit bccecc4c07
3 changed files with 33 additions and 16 deletions
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5
src/engine/fileOps.cpp
View File

@ -590,7 +590,9 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
logD("GB data: vol %d dir %d len %d sl %d",ins->gb.envVol,ins->gb.envDir,ins->gb.envLen,ins->gb.soundLen);
} else if (ds.system[0]==DIV_SYSTEM_GB) {
// try to convert macro to envelope
// set software envelope flag
ins->gb.softEnv=true;
// try to convert macro to envelope in case the user decides to switch to them
if (ins->std.volMacro.len>0) {
ins->gb.envVol=ins->std.volMacro.val[0];
if (ins->std.volMacro.val[0]<ins->std.volMacro.val[1]) {
@ -600,7 +602,6 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
ins->gb.soundLen=ins->std.volMacro.len*2;
}
}
addWarning("Game Boy volume macros converted to envelopes. may not be perfect!");
}
}

41
src/engine/platform/gb.cpp
View File

@ -160,6 +160,16 @@ void DivPlatformGB::tick(bool sysTick) {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].softEnv) {
if (chan[i].std.vol.had) {
chan[i].outVol=VOL_SCALE_LINEAR(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
if (chan[i].outVol<0) chan[i].outVol=0;
// temporary until zombie mode is implemented
chan[i].vol=chan[i].outVol;
chan[i].keyOn=true;
}
}
if (chan[i].std.arp.had) {
if (i==3) { // noise
if (chan[i].std.arp.mode) {
@ -189,7 +199,7 @@ void DivPlatformGB::tick(bool sysTick) {
chan[i].duty=chan[i].std.duty.val;
if (i!=2) {
rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(chan[i].soundLen&63)));
} else {
} else if (!chan[i].softEnv) {
if (parent->song.waveDutyIsVol) {
rWrite(16+i*5+2,gbVolMap[(chan[i].std.duty.val&3)<<2]);
}
@ -244,11 +254,13 @@ void DivPlatformGB::tick(bool sysTick) {
unsigned short data=ins->gb.hwSeq[chan[i].hwSeqPos].data;
switch (ins->gb.hwSeq[chan[i].hwSeqPos].cmd) {
case DivInstrumentGB::DIV_GB_HWCMD_ENVELOPE:
chan[i].envLen=data&7;
chan[i].envDir=(data&8)?1:0;
chan[i].envVol=(data>>4)&15;
chan[i].soundLen=data>>8;
chan[i].keyOn=true;
if (!chan[i].softEnv) {
chan[i].envLen=data&7;
chan[i].envDir=(data&8)?1:0;
chan[i].envVol=(data>>4)&15;
chan[i].soundLen=data>>8;
chan[i].keyOn=true;
}
break;
case DivInstrumentGB::DIV_GB_HWCMD_SWEEP:
chan[i].sweep=data;
@ -352,6 +364,7 @@ int DivPlatformGB::dispatch(DivCommand c) {
chan[c.chan].hwSeqPos=0;
chan[c.chan].hwSeqDelay=0;
chan[c.chan].released=false;
chan[c.chan].softEnv=ins->gb.softEnv;
chan[c.chan].macroInit(ins);
if (c.chan==2) {
if (chan[c.chan].wave<0) {
@ -387,13 +400,15 @@ int DivPlatformGB::dispatch(DivCommand c) {
chan[c.chan].insChanged=true;
if (c.chan!=2) {
DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_GB);
chan[c.chan].envVol=ins->gb.envVol;
chan[c.chan].envLen=ins->gb.envLen;
chan[c.chan].envDir=ins->gb.envDir;
chan[c.chan].soundLen=ins->gb.soundLen;
chan[c.chan].vol=chan[c.chan].envVol;
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));
if (!ins->gb.softEnv) {
chan[c.chan].envVol=ins->gb.envVol;
chan[c.chan].envLen=ins->gb.envLen;
chan[c.chan].envDir=ins->gb.envDir;
chan[c.chan].soundLen=ins->gb.soundLen;
chan[c.chan].vol=chan[c.chan].envVol;
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));
}
}
}
}

3
src/engine/platform/gb.h
View File

@ -29,7 +29,7 @@ class DivPlatformGB: public DivDispatch {
struct Channel {
int freq, baseFreq, pitch, pitch2, note, ins;
unsigned char duty, sweep;
bool active, insChanged, freqChanged, sweepChanged, keyOn, keyOff, inPorta, released;
bool active, insChanged, freqChanged, sweepChanged, keyOn, keyOff, inPorta, released, softEnv;
signed char vol, outVol, wave;
unsigned char envVol, envDir, envLen, soundLen;
unsigned short hwSeqPos;
@ -56,6 +56,7 @@ class DivPlatformGB: public DivDispatch {
keyOff(false),
inPorta(false),
released(false),
softEnv(false),
vol(15),
outVol(15),
wave(-1),