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GBA DMA: implement sample memory

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This commit is contained in:
Natt Akuma 2024-03-16 19:59:55 +07:00
parent 2b9dd1caff
commit 67253245ab
2 changed files with 86 additions and 14 deletions
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86
src/engine/platform/gbadma.cpp
View file

@ -33,13 +33,12 @@ void DivPlatformGBADMA::acquire(short** buf, size_t len) {
// internal mixing is always 10-bit
for (int i=0; i<2; i++) {
bool newSamp=h==0;
chan[i].audDat=0;
if (chan[i].active && (chan[i].useWave || (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen))) {
chan[i].audSub+=(1<<outDepth);
if (chan[i].useWave) {
if (chan[i].audPos<(int)chan[i].audLen) {
chan[i].audDat=chan[i].ws.output[chan[i].audPos]-0x80;
} else {
chan[i].audDat=0;
chan[i].audDat=wtMem[i*256+chan[i].audPos];
}
newSamp=true;
if (chan[i].audSub>=chan[i].freq) {
@ -52,13 +51,12 @@ void DivPlatformGBADMA::acquire(short** buf, size_t len) {
}
chan[i].dmaCount&=15;
}
} else {
} else if (sampleLoaded[chan[i].sample]) {
DivSample* s=parent->getSample(chan[i].sample);
if (s->samples>0) {
if (chan[i].audPos>=0 && chan[i].audPos<(int)s->samples) {
chan[i].audDat=s->data8[chan[i].audPos];
} else {
chan[i].audDat=0;
if (chan[i].audPos>=0) {
unsigned int pos=(sampleOff[chan[i].sample]+chan[i].audPos)&0x01ffffff;
chan[i].audDat=sampleMem[pos];
}
newSamp=true;
if (chan[i].audSub>=chan[i].freq) {
@ -68,8 +66,9 @@ void DivPlatformGBADMA::acquire(short** buf, size_t len) {
chan[i].dmaCount+=posInc;
if (s->isLoopable()) {
if (chan[i].dmaCount>=16 && chan[i].audPos>=s->loopEnd) {
int loopPos=chan[i].audPos-s->loopStart;
chan[i].audPos=(loopPos%(s->loopEnd-s->loopStart))+s->loopStart;
int loopStart=s->loopStart&~3;
int loopPos=chan[i].audPos-loopStart;
chan[i].audPos=(loopPos%(s->loopEnd-s->loopStart))+loopStart;
}
} else if (chan[i].audPos>=(int)s->samples) {
chan[i].sample=-1;
@ -82,8 +81,6 @@ void DivPlatformGBADMA::acquire(short** buf, size_t len) {
chan[i].audPos=0;
}
}
} else {
chan[i].audDat=0;
}
if (!isMuted[i] && newSamp) {
int out=chan[i].audDat*(chan[i].vol*chan[i].envVol/2)<<1;
@ -112,6 +109,7 @@ void DivPlatformGBADMA::tick(bool sysTick) {
if (chan[i].std.vol.had) {
chan[i].envVol=chan[i].std.vol.val;
if (ins->type==DIV_INS_AMIGA) chan[i].envVol/=32;
else if (chan[i].envVol>2) chan[i].envVol=2;
}
if (NEW_ARP_STRAT) {
chan[i].handleArp();
@ -129,7 +127,9 @@ void DivPlatformGBADMA::tick(bool sysTick) {
}
}
if (chan[i].useWave && chan[i].active) {
chan[i].ws.tick();
if (chan[i].ws.tick()) {
updateWave(i);
}
}
if (chan[i].std.pitch.had) {
if (chan[i].std.pitch.mode) {
@ -257,7 +257,7 @@ int DivPlatformGBADMA::dispatch(DivCommand c) {
break;
case DIV_CMD_VOLUME:
if (chan[c.chan].vol!=c.value) {
chan[c.chan].vol=c.value;
chan[c.chan].vol=MIN(c.value,2);
if (!chan[c.chan].std.vol.has) {
chan[c.chan].envVol=2;
}
@ -341,6 +341,13 @@ int DivPlatformGBADMA::dispatch(DivCommand c) {
return 1;
}
void DivPlatformGBADMA::updateWave(int ch) {
int addr=ch*256;
for (unsigned int i=0; i<chan[ch].audLen; i++) {
wtMem[addr+i]=(signed char)(chan[ch].ws.output[i]-128);
}
}
void DivPlatformGBADMA::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
}
@ -405,6 +412,7 @@ void DivPlatformGBADMA::notifyWaveChange(int wave) {
for (int i=0; i<2; i++) {
if (chan[i].useWave && chan[i].wave==wave) {
chan[i].ws.changeWave1(wave);
updateWave(i);
}
}
}
@ -415,6 +423,53 @@ void DivPlatformGBADMA::notifyInsDeletion(void* ins) {
}
}
const void* DivPlatformGBADMA::getSampleMem(int index) {
return index == 0 ? sampleMem : NULL;
}
size_t DivPlatformGBADMA::getSampleMemCapacity(int index) {
return index == 0 ? 33554432 : 0;
}
size_t DivPlatformGBADMA::getSampleMemUsage(int index) {
return index == 0 ? sampleMemLen : 0;
}
bool DivPlatformGBADMA::isSampleLoaded(int index, int sample) {
if (index!=0) return false;
if (sample<0 || sample>255) return false;
return sampleLoaded[sample];
}
void DivPlatformGBADMA::renderSamples(int sysID) {
size_t maxPos=getSampleMemCapacity();
memset(sampleMem,0,maxPos);
size_t memPos=0;
for (int i=0; i<parent->song.sampleLen; i++) {
DivSample* s=parent->song.sample[i];
if (!s->renderOn[0][sysID]) {
sampleOff[i]=0;
continue;
}
int length=s->length8;
int actualLength=MIN((int)(maxPos-memPos),length);
if (actualLength>0) {
sampleOff[i]=memPos;
memcpy(&sampleMem[memPos],s->data8,actualLength);
memPos+=actualLength;
}
if (actualLength<length) {
logW("out of GBA DMA PCM memory for sample %d!",i);
break;
}
sampleLoaded[i]=true;
// pad to multiple of 16 bytes
memPos=(memPos+15)&~15;
}
sampleMemLen=memPos;
}
void DivPlatformGBADMA::setFlags(const DivConfig& flags) {
outDepth=flags.getInt("dacDepth",9);
chipClock=1<<24;
@ -433,12 +488,15 @@ int DivPlatformGBADMA::init(DivEngine* p, int channels, int sugRate, const DivCo
isMuted[i]=false;
oscBuf[i]=new DivDispatchOscBuffer;
}
sampleMem=new signed char[getSampleMemCapacity()];
sampleMemLen=0;
setFlags(flags);
reset();
return 2;
}
void DivPlatformGBADMA::quit() {
delete[] sampleMem;
for (int i=0; i<2; i++) {
delete oscBuf[i];
}

14
src/engine/platform/gbadma.h
View file

@ -54,8 +54,14 @@ class DivPlatformGBADMA: public DivDispatch {
Channel chan[2];
DivDispatchOscBuffer* oscBuf[2];
bool isMuted[2];
unsigned int sampleOff[256];
bool sampleLoaded[256];
int outDepth;
signed char* sampleMem;
size_t sampleMemLen;
// maximum wavetable length is currently hardcoded to 256
signed char wtMem[256*2];
friend void putDispatchChip(void*,int);
friend void putDispatchChan(void*,int,int);
@ -76,8 +82,16 @@ class DivPlatformGBADMA: public DivDispatch {
void notifyInsChange(int ins);
void notifyWaveChange(int wave);
void notifyInsDeletion(void* ins);
const void* getSampleMem(int index = 0);
size_t getSampleMemCapacity(int index = 0);
size_t getSampleMemUsage(int index = 0);
bool isSampleLoaded(int index, int sample);
void renderSamples(int chipID);
int init(DivEngine* parent, int channels, int sugRate, const DivConfig& flags);
void quit();
private:
void updateWave(int ch);
};
#endif