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YM2612: allow for DAC rate higher than 32KHz

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issue #391
This commit is contained in:
tildearrow 2022-04-25 01:42:26 -05:00
parent 832df58929
commit bcade6931a
2 changed files with 24 additions and 4 deletions
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26
src/engine/platform/genesis.cpp
View file

@ -86,14 +86,22 @@ void DivPlatformGenesis::acquire_nuked(short* bufL, short* bufR, size_t start, s
static int os[2]; static int os[2];
for (size_t h=start; h<start+len; h++) { for (size_t h=start; h<start+len; h++) {
if (!dacReady) {
dacDelay+=32000;
if (dacDelay>=rate) {
dacDelay-=rate;
dacReady=true;
}
}
if (dacMode && dacSample!=-1) { if (dacMode && dacSample!=-1) {
dacPeriod+=dacRate; dacPeriod+=dacRate;
if (dacPeriod>=rate) { if (dacPeriod>=rate) {
DivSample* s=parent->getSample(dacSample); DivSample* s=parent->getSample(dacSample);
if (s->samples>0) { if (s->samples>0) {
if (!isMuted[5]) { if (!isMuted[5]) {
if (writes.size()<16) { if (dacReady && writes.size()<16) {
urgentWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80); urgentWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80);
dacReady=false;
} }
} }
if (++dacPos>=s->samples) { if (++dacPos>=s->samples) {
@ -106,7 +114,7 @@ void DivPlatformGenesis::acquire_nuked(short* bufL, short* bufR, size_t start, s
} }
} }
} }
dacPeriod-=rate; while (dacPeriod>=rate) dacPeriod-=rate;
} else { } else {
dacSample=-1; dacSample=-1;
} }
@ -155,14 +163,22 @@ void DivPlatformGenesis::acquire_ymfm(short* bufL, short* bufR, size_t start, si
static int os[2]; static int os[2];
for (size_t h=start; h<start+len; h++) { for (size_t h=start; h<start+len; h++) {
if (!dacReady) {
dacDelay+=32000;
if (dacDelay>=rate) {
dacDelay-=rate;
dacReady=true;
}
}
if (dacMode && dacSample!=-1) { if (dacMode && dacSample!=-1) {
dacPeriod+=dacRate; dacPeriod+=dacRate;
if (dacPeriod>=rate) { if (dacPeriod>=rate) {
DivSample* s=parent->getSample(dacSample); DivSample* s=parent->getSample(dacSample);
if (s->samples>0) { if (s->samples>0) {
if (!isMuted[5]) { if (!isMuted[5]) {
if (writes.size()<16) { if (dacReady && writes.size()<16) {
urgentWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80); urgentWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80);
dacReady=false;
} }
} }
if (++dacPos>=s->samples) { if (++dacPos>=s->samples) {
@ -175,7 +191,7 @@ void DivPlatformGenesis::acquire_ymfm(short* bufL, short* bufR, size_t start, si
} }
} }
} }
dacPeriod-=rate; while (dacPeriod>=rate) dacPeriod-=rate;
} else { } else {
dacSample=-1; dacSample=-1;
} }
@ -858,6 +874,8 @@ void DivPlatformGenesis::reset() {
dacPeriod=0; dacPeriod=0;
dacPos=0; dacPos=0;
dacRate=0; dacRate=0;
dacDelay=0;
dacReady=true;
dacSample=-1; dacSample=-1;
sampleBank=0; sampleBank=0;
lfoValue=8; lfoValue=8;

2
src/engine/platform/genesis.h
View file

@ -85,6 +85,8 @@ class DivPlatformGenesis: public DivDispatch {
int dacRate; int dacRate;
unsigned int dacPos; unsigned int dacPos;
int dacSample; int dacSample;
int dacDelay;
bool dacReady;
unsigned char sampleBank; unsigned char sampleBank;
unsigned char lfoValue; unsigned char lfoValue;