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Add support of N163 demultiplexed output

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so, there's to way for reduce N163 noises: reduce channel limit and demultiplex
* channel limit is runtime changeable and it makes some usable effects with disable demultiplex
* demultiplex is used for "non-ear destroyable" emulators, but less hardware accurate. (when LPF and RF filter is not considered)
Furnace support both after this, You can choose output behavior via configuration flag.
This commit is contained in:
cam900 2022-04-10 20:22:49 +09:00
parent e23dcd6e1b
commit e6d74766ca
5 changed files with 39 additions and 3 deletions
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5
src/engine/platform/n163.cpp
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@ -156,7 +156,7 @@ const char* DivPlatformN163::getEffectName(unsigned char effect) {
void DivPlatformN163::acquire(short* bufL, short* bufR, size_t start, size_t len) {
for (size_t i=start; i<start+len; i++) {
n163.tick();
int out=(n163.out()<<6)*2; // scale to 16 bit
int out=((n163.out()<<6)*2); // scale to 16 bit
if (out>32767) out=32767;
if (out<-32768) out=-32768;
bufL[i]=bufR[i]=out;
@ -607,6 +607,7 @@ void DivPlatformN163::reset() {
memset(regPool,0,128);
n163.set_disable(false);
n163.set_multiplex(multiplex);
chanMax=initChanMax;
loadWave=-1;
loadPos=0;
@ -636,8 +637,10 @@ void DivPlatformN163::setFlags(unsigned int flags) {
break;
}
initChanMax=chanMax=(flags>>4)&7;
multiplex=((flags>>7)&1)?false:true; // not accurate in real hardware
chipClock=rate;
rate/=15;
n163.set_multiplex(multiplex);
rWrite(0x7f,initChanMax<<4);
}