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Genesis: prioritize DAC writes

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tildearrow 2022-03-14 01:38:11 -05:00
parent e009fc64f2
commit 67d516fcee
3 changed files with 9 additions and 8 deletions
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10
src/engine/platform/genesis.cpp
View file

@ -92,7 +92,7 @@ void DivPlatformGenesis::acquire_nuked(short* bufL, short* bufR, size_t start, s
DivSample* s=parent->getSample(dacSample); DivSample* s=parent->getSample(dacSample);
if (s->samples>0) { if (s->samples>0) {
if (!isMuted[5]) { if (!isMuted[5]) {
immWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80); urgentWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80);
} }
if (++dacPos>=s->samples) { if (++dacPos>=s->samples) {
if (s->loopStart>=0 && s->loopStart<=(int)s->samples) { if (s->loopStart>=0 && s->loopStart<=(int)s->samples) {
@ -121,7 +121,7 @@ void DivPlatformGenesis::acquire_nuked(short* bufL, short* bufR, size_t start, s
//printf("write: %x = %.2x\n",w.addr,w.val); //printf("write: %x = %.2x\n",w.addr,w.val);
lastBusy=0; lastBusy=0;
regPool[w.addr&0x1ff]=w.val; regPool[w.addr&0x1ff]=w.val;
writes.pop(); writes.pop_front();
} else { } else {
lastBusy++; lastBusy++;
if (fm.write_busy==0) { if (fm.write_busy==0) {
@ -159,7 +159,7 @@ void DivPlatformGenesis::acquire_ymfm(short* bufL, short* bufR, size_t start, si
DivSample* s=parent->getSample(dacSample); DivSample* s=parent->getSample(dacSample);
if (s->samples>0) { if (s->samples>0) {
if (!isMuted[5]) { if (!isMuted[5]) {
immWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80); urgentWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80);
} }
if (++dacPos>=s->samples) { if (++dacPos>=s->samples) {
if (s->loopStart>=0 && s->loopStart<=(int)s->samples) { if (s->loopStart>=0 && s->loopStart<=(int)s->samples) {
@ -184,7 +184,7 @@ void DivPlatformGenesis::acquire_ymfm(short* bufL, short* bufR, size_t start, si
fm_ymfm->write(0x0+((w.addr>>8)<<1),w.addr); fm_ymfm->write(0x0+((w.addr>>8)<<1),w.addr);
fm_ymfm->write(0x1+((w.addr>>8)<<1),w.val); fm_ymfm->write(0x1+((w.addr>>8)<<1),w.val);
regPool[w.addr&0x1ff]=w.val; regPool[w.addr&0x1ff]=w.val;
writes.pop(); writes.pop_front();
lastBusy=1; lastBusy=1;
} }
@ -782,7 +782,7 @@ int DivPlatformGenesis::getRegisterPoolSize() {
} }
void DivPlatformGenesis::reset() { void DivPlatformGenesis::reset() {
while (!writes.empty()) writes.pop(); while (!writes.empty()) writes.pop_front();
memset(regPool,0,512); memset(regPool,0,512);
if (useYMFM) { if (useYMFM) {
fm_ymfm->reset(); fm_ymfm->reset();

4
src/engine/platform/genesis.h
View file

@ -20,7 +20,7 @@
#ifndef _GENESIS_H #ifndef _GENESIS_H
#define _GENESIS_H #define _GENESIS_H
#include "../dispatch.h" #include "../dispatch.h"
#include <queue> #include <deque>
#include "../../../extern/Nuked-OPN2/ym3438.h" #include "../../../extern/Nuked-OPN2/ym3438.h"
#include "sound/ymfm/ymfm_opn.h" #include "sound/ymfm/ymfm_opn.h"
@ -68,7 +68,7 @@ class DivPlatformGenesis: public DivDispatch {
bool addrOrVal; bool addrOrVal;
QueuedWrite(unsigned short a, unsigned char v): addr(a), val(v), addrOrVal(false) {} QueuedWrite(unsigned short a, unsigned char v): addr(a), val(v), addrOrVal(false) {}
}; };
std::queue<QueuedWrite> writes; std::deque<QueuedWrite> writes;
ym3438_t fm; ym3438_t fm;
int delay; int delay;
unsigned char lastBusy; unsigned char lastBusy;

3
src/engine/platform/genesisshared.h
View file

@ -43,6 +43,7 @@ static int orderedOps[4]={
}; };
#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;} #define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} } #define immWrite(a,v) if (!skipRegisterWrites) {writes.push_back(QueuedWrite(a,v)); if (dumpWrites) {addWrite(a,v);} }
#define urgentWrite(a,v) if (!skipRegisterWrites) {if (writes.front().addrOrVal) {writes.push_back(QueuedWrite(a,v));} else {writes.push_front(QueuedWrite(a,v));}; if (dumpWrites) {addWrite(a,v);} }
#include "fmshared_OPN.h" #include "fmshared_OPN.h"