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Game Boy: implement anti-click

This commit is contained in:
tildearrow 2022-08-03 19:17:18 -05:00
parent 7ec4f7cb9e
commit a0d10aa60b
2 changed files with 21 additions and 2 deletions
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19
src/engine/platform/gb.cpp
View File

@ -97,10 +97,11 @@ void DivPlatformGB::acquire(short* bufL, short* bufR, size_t start, size_t len)
void DivPlatformGB::updateWave() {
rWrite(0x1a,0);
for (int i=0; i<16; i++) {
int nibble1=15-ws.output[i<<1];
int nibble2=15-ws.output[1+(i<<1)];
int nibble1=15-ws.output[((i<<1)+antiClickWavePos)&31];
int nibble2=15-ws.output[((1+(i<<1))+antiClickWavePos)&31];
rWrite(0x30+i,(nibble1<<4)|nibble2);
}
antiClickWavePos&=31;
}
static unsigned char chanMuteMask[4]={
@ -151,6 +152,12 @@ static unsigned char noiseTable[256]={
};
void DivPlatformGB::tick(bool sysTick) {
if (antiClickEnabled && sysTick && chan[2].freq>0) {
antiClickPeriodCount+=((chipClock>>1)/MAX(parent->getCurHz(),1.0f));
antiClickWavePos+=antiClickPeriodCount/chan[2].freq;
antiClickPeriodCount%=chan[2].freq;
}
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.arp.had) {
@ -471,6 +478,9 @@ void DivPlatformGB::reset() {
lastPan=0xff;
immWrite(0x25,procMute());
immWrite(0x24,0x77);
antiClickPeriodCount=0;
antiClickWavePos=0;
}
bool DivPlatformGB::isStereo() {
@ -507,6 +517,10 @@ void DivPlatformGB::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) immWrite(i.addr,i.val);
}
void DivPlatformGB::setFlags(unsigned int flags) {
antiClickEnabled=!(flags&8);
}
int DivPlatformGB::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
chipClock=4194304;
rate=chipClock/16;
@ -519,6 +533,7 @@ int DivPlatformGB::init(DivEngine* p, int channels, int sugRate, unsigned int fl
dumpWrites=false;
skipRegisterWrites=false;
gb=new GB_gameboy_t;
setFlags(flags);
reset();
return 4;
}

4
src/engine/platform/gb.h
View File

@ -59,9 +59,12 @@ class DivPlatformGB: public DivDispatch {
Channel chan[4];
DivDispatchOscBuffer* oscBuf[4];
bool isMuted[4];
bool antiClickEnabled;
unsigned char lastPan;
DivWaveSynth ws;
int antiClickPeriodCount, antiClickWavePos;
GB_gameboy_t* gb;
unsigned char regPool[128];
@ -88,6 +91,7 @@ class DivPlatformGB: public DivDispatch {
void poke(std::vector<DivRegWrite>& wlist);
const char** getRegisterSheet();
const char* getEffectName(unsigned char effect);
void setFlags(unsigned int flags);
int init(DivEngine* parent, int channels, int sugRate, unsigned int flags);
void quit();
~DivPlatformGB();