etc
/
furnace
mirror of https://github.com/tildearrow/furnace.git
0
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

YM2612: allow for DAC rate higher than 32KHz 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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

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

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