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arcade: add ymfm-based core

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less CPU usage at the cost of some quality
This commit is contained in:
tildearrow 2021-12-15 01:23:58 -05:00
parent 8de60fe2a6
commit 2879b5e4d0
21 changed files with 964 additions and 10 deletions
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87
src/engine/platform/arcade.cpp
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@ -33,7 +33,7 @@ static int orderedOps[4]={
#define rWrite(a,v) pendingWrites[a]=v;
void DivPlatformArcade::acquire(short* bufL, short* bufR, size_t start, size_t len) {
void DivPlatformArcade::acquire_nuked(short* bufL, short* bufR, size_t start, size_t len) {
static int o[2];
for (size_t h=start; h<start+len; h++) {
@ -92,6 +92,68 @@ void DivPlatformArcade::acquire(short* bufL, short* bufR, size_t start, size_t l
}
}
void DivPlatformArcade::acquire_ymfm(short* bufL, short* bufR, size_t start, size_t len) {
static int os[2];
for (size_t h=start; h<start+len; h++) {
os[0]=0; os[1]=0;
if (!writes.empty()) {
if (--delay<1) {
QueuedWrite& w=writes.front();
fm_ymfm->write(0x0+((w.addr>>8)<<1),w.addr);
fm_ymfm->write(0x1+((w.addr>>8)<<1),w.val);
writes.pop();
delay=1;
}
}
fm_ymfm->generate(&out_ymfm);
pcmCycles+=31250;
if (pcmCycles>=rate) {
pcmCycles-=rate;
// do a PCM cycle
pcmL=0; pcmR=0;
for (int i=8; i<13; i++) {
if (chan[i].pcm.sample>=0) {
DivSample* s=parent->song.sample[chan[i].pcm.sample];
if (s->depth==8) {
pcmL+=(s->rendData[chan[i].pcm.pos>>8]*chan[i].chVolL);
pcmR+=(s->rendData[chan[i].pcm.pos>>8]*chan[i].chVolR);
} else {
pcmL+=(s->rendData[chan[i].pcm.pos>>8]*chan[i].chVolL)>>8;
pcmR+=(s->rendData[chan[i].pcm.pos>>8]*chan[i].chVolR)>>8;
}
chan[i].pcm.pos+=chan[i].pcm.freq;
if (chan[i].pcm.pos>=(s->rendLength<<8)) {
chan[i].pcm.sample=-1;
}
}
}
}
os[0]=out_ymfm.data[0]+pcmL;
if (os[0]<-32768) os[0]=-32768;
if (os[0]>32767) os[0]=32767;
os[1]=out_ymfm.data[1]+pcmR;
if (os[1]<-32768) os[1]=-32768;
if (os[1]>32767) os[1]=32767;
bufL[h]=os[0];
bufR[h]=os[1];
}
}
void DivPlatformArcade::acquire(short* bufL, short* bufR, size_t start, size_t len) {
if (useYMFM) {
acquire_ymfm(bufL,bufR,start,len);
} else {
acquire_nuked(bufL,bufR,start,len);
}
}
unsigned char noteMap[12]={
0, 1, 2, 4, 5, 6, 8, 9, 10, 12, 13, 14
};
@ -343,8 +405,12 @@ int DivPlatformArcade::dispatch(DivCommand c) {
void DivPlatformArcade::reset() {
while (!writes.empty()) writes.pop();
memset(&fm,0,sizeof(opm_t));
OPM_Reset(&fm);
if (useYMFM) {
fm_ymfm->reset();
} else {
memset(&fm,0,sizeof(opm_t));
OPM_Reset(&fm);
}
for (int i=0; i<13; i++) {
chan[i]=DivPlatformArcade::Channel();
chan[i].vol=0x7f;
@ -360,6 +426,7 @@ void DivPlatformArcade::reset() {
pcmL=0;
pcmR=0;
sampleBank=0;
delay=0;
rWrite(0x19,0xff);
@ -370,15 +437,27 @@ bool DivPlatformArcade::isStereo() {
return true;
}
void DivPlatformArcade::setYMFM(bool use) {
useYMFM=use;
}
int DivPlatformArcade::init(DivEngine* p, int channels, int sugRate, bool pal) {
parent=p;
rate=447443;
if (useYMFM) {
rate=447443/8;
fm_ymfm=new ymfm::ym2151(iface);
} else {
rate=447443;
}
reset();
return 13;
}
void DivPlatformArcade::quit() {
if (useYMFM) {
delete fm_ymfm;
}
}
DivPlatformArcade::~DivPlatformArcade() {