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prepare for possible major optimization

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by just forwarding an output buffer to the dispatch and begin/length,
the number of calls may be reduced which improves performance.
This commit is contained in:
tildearrow 2021-12-06 05:21:42 -05:00
parent 055b4f9c26
commit 6efcfc2e8a
19 changed files with 178 additions and 132 deletions
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87
src/engine/platform/genesis.cpp
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@ -12,59 +12,60 @@ static unsigned char konOffs[6]={
0, 1, 2, 4, 5, 6
};
void DivPlatformGenesis::acquire(int& l, int& r) {
void DivPlatformGenesis::acquire(short** buf, size_t start, size_t len) {
static short o[2];
static int os[2];
if (dacMode && dacSample!=-1) {
dacPeriod-=6;
if (dacPeriod<1) {
DivSample* s=parent->song.sample[dacSample];
if (s->depth==8) {
writes.emplace(0x2a,(unsigned char)s->rendData[dacPos++]+0x80);
} else {
writes.emplace(0x2a,((unsigned short)s->rendData[dacPos++]+0x8000)>>8);
for (size_t h=start; h<start+len; h++) {
if (dacMode && dacSample!=-1) {
dacPeriod-=6;
if (dacPeriod<1) {
DivSample* s=parent->song.sample[dacSample];
if (s->depth==8) {
writes.emplace(0x2a,(unsigned char)s->rendData[dacPos++]+0x80);
} else {
writes.emplace(0x2a,((unsigned short)s->rendData[dacPos++]+0x8000)>>8);
}
if (dacPos>=s->rendLength) {
dacSample=-1;
}
dacPeriod+=dacRate;
}
if (dacPos>=s->rendLength) {
dacSample=-1;
}
dacPeriod+=dacRate;
}
}
os[0]=0; os[1]=0;
for (int i=0; i<6; i++) {
if (!writes.empty() && --delay<0) {
delay=0;
QueuedWrite& w=writes.front();
if (w.addrOrVal) {
OPN2_Write(&fm,0x1+((w.addr>>8)<<1),w.val);
//printf("write: %x = %.2x\n",w.addr,w.val);
lastBusy=0;
writes.pop();
} else {
lastBusy++;
if (fm.write_busy==0) {
//printf("busycounter: %d\n",lastBusy);
OPN2_Write(&fm,0x0+((w.addr>>8)<<1),w.addr);
w.addrOrVal=true;
os[0]=0; os[1]=0;
for (int i=0; i<6; i++) {
if (!writes.empty() && --delay<0) {
delay=0;
QueuedWrite& w=writes.front();
if (w.addrOrVal) {
OPN2_Write(&fm,0x1+((w.addr>>8)<<1),w.val);
//printf("write: %x = %.2x\n",w.addr,w.val);
lastBusy=0;
writes.pop();
} else {
lastBusy++;
if (fm.write_busy==0) {
//printf("busycounter: %d\n",lastBusy);
OPN2_Write(&fm,0x0+((w.addr>>8)<<1),w.addr);
w.addrOrVal=true;
}
}
}
}
OPN2_Clock(&fm,o); os[0]+=o[0]; os[1]+=o[1];
//OPN2_Write(&fm,0,0);
}
OPN2_Clock(&fm,o); os[0]+=o[0]; os[1]+=o[1];
//OPN2_Write(&fm,0,0);
}
psgClocks+=223722;
while (psgClocks>=rate) {
psgOut=(psg.acquireOne()*3)>>3;
psgClocks-=rate;
}
psgClocks+=223722;
while (psgClocks>=rate) {
psg.acquire(psgOut,psgOut);
psgClocks-=rate;
psgOut=(psgOut>>2)+(psgOut>>3);
buf[0][h]=(os[0]<<5)+psgOut;
buf[1][h]=(os[1]<<5)+psgOut;
}
l=(os[0]<<5)+psgOut;
r=(os[1]<<5)+psgOut;
}
void DivPlatformGenesis::tick() {