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OPNA: RSS write optimization

This commit is contained in:
tildearrow 2022-05-14 01:02:28 -05:00
parent c685b60a3c
commit 031a0fc133
2 changed files with 17 additions and 4 deletions
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20
src/engine/platform/ym2608.cpp
View File

@ -696,6 +696,11 @@ void DivPlatformYM2608::tick(bool sysTick) {
chan[15].freqChanged=false;
}
if (writeRSSOff) {
immWrite(0x10,0x80|writeRSSOff);
writeRSSOff=0;
}
for (int i=16; i<512; i++) {
if (pendingWrites[i]!=oldWrites[i]) {
immWrite(i,pendingWrites[i]&0xff);
@ -731,6 +736,11 @@ void DivPlatformYM2608::tick(bool sysTick) {
chan[i].keyOn=false;
}
}
if (writeRSSOn) {
immWrite(0x10,writeRSSOn);
writeRSSOn=0;
}
}
int DivPlatformYM2608::dispatch(DivCommand c) {
@ -805,10 +815,10 @@ int DivPlatformYM2608::dispatch(DivCommand c) {
}
break;
}
if (c.chan>8) { // RSS TODO: improve rhythm writing strategy
if (c.chan>8) { // RSS
if (skipRegisterWrites) break;
writeRSSOn|=(1<<(c.chan-9));
immWrite(0x18+(c.chan-9),isMuted[c.chan]?0:((chan[c.chan].pan<<6)|chan[c.chan].vol));
immWrite(0x10,0x00|(1<<(c.chan-9)));
break;
}
DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_FM);
@ -866,7 +876,7 @@ int DivPlatformYM2608::dispatch(DivCommand c) {
break;
}
if (c.chan>8) {
immWrite(0x10,0x80|(1<<(c.chan-9)));
writeRSSOff|=1<<(c.chan-9);
break;
}
chan[c.chan].keyOff=true;
@ -880,7 +890,7 @@ int DivPlatformYM2608::dispatch(DivCommand c) {
break;
}
if (c.chan>8) {
immWrite(0x10,0x80|(1<<(c.chan-9)));
writeRSSOff|=1<<(c.chan-9);
break;
}
chan[c.chan].keyOff=true;
@ -1340,6 +1350,8 @@ void DivPlatformYM2608::reset() {
lastBusy=60;
sampleBank=0;
writeRSSOff=0;
writeRSSOn=0;
delay=0;

1
src/engine/platform/ym2608.h
View File

@ -104,6 +104,7 @@ class DivPlatformYM2608: public DivDispatch {
DivPlatformAY8910* ay;
unsigned char sampleBank;
unsigned char writeRSSOff, writeRSSOn;
int delay;