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ZSM: add optimize for size toggle

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MooingLemur 2023-08-11 13:03:37 -07:00 • committed by tildearrow
parent fe8f94b2b2
commit a1d74e7dc1
6 changed files with 23 additions and 7 deletions
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14
src/engine/zsm.cpp
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@ -66,6 +66,8 @@ void DivZSM::init(unsigned int rate) {
// Channel masks
ymMask=0;
psgMask=0;
// Optimize writes
optimize=false;
}
int DivZSM::getoffset() {
@ -121,9 +123,6 @@ void DivZSM::writeSync(unsigned char a, unsigned char v) {
}
void DivZSM::writePSG(unsigned char a, unsigned char v) {
// TODO: suppress writes to PSG voice that is not audible (volume=0)
// ^ Let's leave these alone, ZSMKit has a feature that can benefit
// from silent channels.
if (a>=69) {
logD("ZSM: ignoring VERA PSG write a=%02x v=%02x",a,v);
return;
@ -213,6 +212,10 @@ void DivZSM::setLoopPoint() {
}
}
void DivZSM::setOptimize(bool o) {
optimize = o;
}
SafeWriter* DivZSM::finish() {
tick(0); // flush any pending writes / ticks
flushTicks(); // flush ticks in case there were no writes pending
@ -278,6 +281,11 @@ void DivZSM::flushWrites() {
flushTicks(); // only flush ticks if there are writes pending.
for (unsigned char i=0; i<64; i++) {
if (psgState[psg_NEW][i]==psgState[psg_PREV][i]) continue;
// if optimize=true, suppress writes to PSG voices that are not audible (volume=0 or R+L=0)
// ZSMKit has a feature that can benefit from having silent channels
// updated, so this is something that can be toggled off or on for export
if (optimize && i%4!=2 && (psgState[psg_NEW][(i&0x3c)+2]&0x3f)==0) continue; // vol
if (optimize && i%4!=2 && (psgState[psg_NEW][(i&0x3c)+2]&0xc0)==0) continue; // R+L
psgState[psg_PREV][i]=psgState[psg_NEW][i];
w->writeC(i);
w->writeC(psgState[psg_NEW][i]);