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better compatibility with old GB modules

This commit is contained in:
tildearrow 2022-01-03 23:22:39 -05:00
parent 4c8ff2edb3
commit 943e4e374f
1 changed files with 23 additions and 0 deletions
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23
src/engine/engine.cpp
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@ -819,6 +819,17 @@ bool DivEngine::load(unsigned char* f, size_t slen) {
ins->gb.soundLen=reader.readC();
logD("GB data: vol %d dir %d len %d sl %d\n",ins->gb.envVol,ins->gb.envDir,ins->gb.envLen,ins->gb.soundLen);
} else if (ds.system==DIV_SYSTEM_GB) {
// try to convert macro to envelope
if (ins->std.volMacroLen>0) {
ins->gb.envVol=ins->std.volMacro[0];
if (ins->std.volMacro[0]<ins->std.volMacro[1]) {
ins->gb.envDir=true;
}
if (ins->std.volMacro[ins->std.volMacroLen-1]==0) {
ins->gb.soundLen=ins->std.volMacroLen*2;
}
}
}
}
@ -878,6 +889,12 @@ bool DivEngine::load(unsigned char* f, size_t slen) {
// ditto
pat->data[k][1]--;
}
if (ds.version<0x12) {
if (ds.system==DIV_SYSTEM_GB && i==3 && pat->data[k][1]>0) {
// back then noise was 2 octaves lower
pat->data[k][1]-=2;
}
}
// volume
pat->data[k][3]=reader.readS();
if (ds.version<0x0a) {
@ -888,6 +905,12 @@ bool DivEngine::load(unsigned char* f, size_t slen) {
pat->data[k][3]>>=1;
}
}
if (ds.version<0x12) {
if (ds.system==DIV_SYSTEM_GB && i==2 && pat->data[k][3]>0) {
// volume range of GB wave channel was 0-3 rather than 0-F
pat->data[k][3]=(pat->data[k][3]&3)*5;
}
}
for (int l=0; l<chan.effectRows; l++) {
// effect
pat->data[k][4+(l<<1)]=reader.readS();