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YM2612: add reverse sample playback

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This commit is contained in:
tildearrow 2022-05-27 02:47:44 -05:00
parent 9d6d84a87f
commit 0b7d27dc29
7 changed files with 34 additions and 10 deletions
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19
src/engine/platform/genesis.cpp
View file

@ -125,6 +125,9 @@ const char* DivPlatformGenesis::getEffectName(unsigned char effect) {
case 0x5f:
return "5Fxx: Set decay 2 of operator 4 (0 to 1F)";
break;
case 0xdf:
return "DFxx: Set sample playback direction (0: normal; 1: reverse)";
break;
}
return NULL;
}
@ -148,12 +151,12 @@ void DivPlatformGenesis::acquire_nuked(short* bufL, short* bufR, size_t start, s
if (s->samples>0) {
if (!isMuted[5]) {
if (dacReady && writes.size()<16) {
urgentWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80);
urgentWrite(0x2a,(unsigned char)s->data8[dacDirection?(s->samples-dacPos-1):dacPos]+0x80);
dacReady=false;
}
}
if (++dacPos>=s->samples) {
if (s->loopStart>=0 && s->loopStart<(int)s->samples) {
if (s->loopStart>=0 && s->loopStart<(int)s->samples && !dacDirection) {
dacPos=s->loopStart;
} else {
dacSample=-1;
@ -228,12 +231,12 @@ void DivPlatformGenesis::acquire_ymfm(short* bufL, short* bufR, size_t start, si
if (s->samples>0) {
if (!isMuted[5]) {
if (dacReady && writes.size()<16) {
urgentWrite(0x2a,(unsigned char)s->data8[dacPos]+0x80);
urgentWrite(0x2a,(unsigned char)s->data8[dacDirection?(s->samples-dacPos-1):dacPos]+0x80);
dacReady=false;
}
}
if (++dacPos>=s->samples) {
if (s->loopStart>=0 && s->loopStart<(int)s->samples) {
if (s->loopStart>=0 && s->loopStart<(int)s->samples && !dacDirection) {
dacPos=s->loopStart;
} else {
dacSample=-1;
@ -770,6 +773,11 @@ int DivPlatformGenesis::dispatch(DivCommand c) {
sampleBank=parent->song.sample.size()/12;
}
break;
case DIV_CMD_SAMPLE_DIR: {
dacDirection=c.value;
if (dumpWrites) addWrite(0xffff0003,dacDirection);
break;
}
case DIV_CMD_LEGATO: {
if (c.chan==5 && chan[c.chan].furnaceDac && dacMode) {
chan[c.chan].baseFreq=parent->calcBaseFreq(1,1,c.value,false);
@ -1062,11 +1070,14 @@ void DivPlatformGenesis::reset() {
dacDelay=0;
dacReady=true;
dacSample=-1;
dacDirection=false;
sampleBank=0;
lfoValue=8;
extMode=false;
if (dumpWrites) addWrite(0xffff0003,dacDirection);
// LFO
immWrite(0x22,lfoValue);

1
src/engine/platform/genesis.h
View file

@ -93,6 +93,7 @@ class DivPlatformGenesis: public DivDispatch {
int dacSample;
int dacDelay;
bool dacReady;
bool dacDirection;
unsigned char sampleBank;
unsigned char lfoValue;