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NES: implement DPCM loop

This commit is contained in:
tildearrow 2022-09-22 18:43:48 -05:00
parent 52cd4f15de
commit cbff5f190c
2 changed files with 7 additions and 3 deletions
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9
src/engine/platform/nes.cpp
View File

@ -320,9 +320,10 @@ void DivPlatformNES::tick(bool sysTick) {
unsigned int dpcmAddr=parent->getSample(dacSample)->offDPCM;
unsigned int dpcmLen=(parent->getSample(dacSample)->lengthDPCM+15)>>4;
if (dpcmLen>255) dpcmLen=255;
goingToLoop=parent->getSample(dacSample)->isLoopable();
// write DPCM
rWrite(0x4015,15);
rWrite(0x4010,calcDPCMRate(dacRate));
rWrite(0x4010,calcDPCMRate(dacRate)|(goingToLoop?0x40:0));
rWrite(0x4012,(dpcmAddr>>6)&0xff);
rWrite(0x4013,dpcmLen&0xff);
rWrite(0x4015,31);
@ -330,7 +331,7 @@ void DivPlatformNES::tick(bool sysTick) {
}
} else {
if (dpcmMode) {
rWrite(0x4010,calcDPCMRate(dacRate));
rWrite(0x4010,calcDPCMRate(dacRate)|(goingToLoop?0x40:0));
}
}
if (dumpWrites && !dpcmMode) addWrite(0xffff0001,dacRate);
@ -385,9 +386,10 @@ int DivPlatformNES::dispatch(DivCommand c) {
unsigned int dpcmAddr=parent->getSample(dacSample)->offDPCM;
unsigned int dpcmLen=(parent->getSample(dacSample)->lengthDPCM+15)>>4;
if (dpcmLen>255) dpcmLen=255;
goingToLoop=parent->getSample(dacSample)->isLoopable();
// write DPCM
rWrite(0x4015,15);
rWrite(0x4010,calcDPCMRate(dacRate));
rWrite(0x4010,calcDPCMRate(dacRate)|(goingToLoop?0x40:0));
rWrite(0x4012,(dpcmAddr>>6)&0xff);
rWrite(0x4013,dpcmLen&0xff);
rWrite(0x4015,31);
@ -612,6 +614,7 @@ void DivPlatformNES::reset() {
sampleBank=0;
dpcmBank=0;
dpcmMode=false;
goingToLoop=false;
if (useNP) {
nes1_NP->Reset();

1
src/engine/platform/nes.h
View File

@ -73,6 +73,7 @@ class DivPlatformNES: public DivDispatch {
bool dpcmMode;
bool dacAntiClickOn;
bool useNP;
bool goingToLoop;
struct NESAPU* nes;
xgm::NES_APU* nes1_NP;
xgm::NES_DMC* nes2_NP;