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VGM export: why

This commit is contained in:
tildearrow 2022-10-09 17:24:24 -05:00
parent 38eed64734
commit 9f105d92a8
1 changed files with 39 additions and 17 deletions
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56
src/engine/vgmOps.cpp
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@ -807,6 +807,20 @@ void DivEngine::performVGMWrite(SafeWriter* w, DivSystem sys, DivRegWrite& write
}
}
#define CHIP_VOL(_id,_mult) { \
double _vol=fabs(song.systemVol[i])*4.0*_mult; \
if (_vol<0.0) _vol=0.0; \
if (_vol>32767.0) _vol=32767.0; \
chipVol.push_back((_id)|(0x80000000)|(((unsigned int)_vol)<<16)); \
}
#define CHIP_VOL_SECOND(_id,_mult) { \
double _vol=fabs(song.systemVol[i])*4.0*_mult; \
if (_vol<0.0) _vol=0.0; \
if (_vol>32767.0) _vol=32767.0; \
chipVol.push_back((_id)|(0x80000100)|(((unsigned int)_vol)<<16)); \
}
SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool patternHints) {
if (version<0x150) {
lastError="VGM version is too low";
@ -910,6 +924,7 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
double loopFreq[DIV_MAX_CHANS];
int loopSample[DIV_MAX_CHANS];
bool sampleDir[DIV_MAX_CHANS];
std::vector<unsigned int> chipVol;
for (int i=0; i<DIV_MAX_CHANS; i++) {
loopTimer[i]=0;
@ -943,6 +958,7 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
case DIV_SYSTEM_SMS:
if (!hasSN) {
hasSN=disCont[i].dispatch->chipClock;
CHIP_VOL(0,1.0);
willExport[i]=true;
switch (song.systemFlags[i].getInt("chipType",0)) {
case 1: // real SN
@ -961,6 +977,7 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
} else if (!(hasSN&0x40000000)) {
isSecond[i]=true;
willExport[i]=true;
CHIP_VOL_SECOND(0,1.0);
hasSN|=0x40000000;
howManyChips++;
}
@ -1353,14 +1370,6 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
}
}
//bool wantsExtraHeader=false;
/*for (int i=0; i<song.systemLen; i++) {
if (isSecond[i]) {
wantsExtraHeader=true;
break;
}
}*/
// write chips and stuff
w->writeI(hasSN);
w->writeI(hasOPLL);
@ -1422,8 +1431,15 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
w->writeC(0); // OPN
w->writeC(0); // OPNA
}
if (version>=0x160) {
int calcVolume=32.0*(log(song.masterVol)/log(2.0));
if (calcVolume<-63) calcVolume=-63;
if (calcVolume>192) calcVolume=192;
w->writeC(calcVolume&0xff); // volume
} else {
w->writeC(0); // volume
}
// currently not used but is part of 1.60
w->writeC(0); // volume
w->writeC(0); // reserved
w->writeC(0); // loop count
// 1.51
@ -1507,15 +1523,21 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
w->writeI(0);
}
/* TODO
unsigned int exHeaderOff=w->tell();
if (wantsExtraHeader) {
w->writeI(4);
if (version>=0x170) {
logD("writing extended header...");
w->writeI(8);
w->writeI(0);
w->writeI(4);
// write clocks
w->writeC(howManyChips);
}*/
// write chip volumes
logD("writing chip volumes (%ld)...",chipVol.size());
w->writeC(chipVol.size());
for (unsigned int& i: chipVol) {
logV("- %.8x",i);
w->writeI(i);
}
}
unsigned int songOff=w->tell();
@ -2015,10 +2037,10 @@ SafeWriter* DivEngine::saveVGM(bool* sysToExport, bool loop, int version, bool p
}
w->seek(0x34,SEEK_SET);
w->writeI(songOff-0x34);
/*if (wantsExtraHeader) {
if (version>=0x170) {
w->seek(0xbc,SEEK_SET);
w->writeI(exHeaderOff-0xbc);
}*/
}
remainingLoops=-1;
playing=false;