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C64: per-chan osc filters and volume

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tildearrow 2023-07-11 18:11:48 -05:00
parent e8130caa52
commit 6ce45593cf
2 changed files with 47 additions and 6 deletions
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49
src/engine/platform/c64.cpp
View file

@ -64,6 +64,41 @@ const char** DivPlatformC64::getRegisterSheet() {
return regCheatSheetSID;
}
short DivPlatformC64::runFakeFilter(unsigned char ch, int in) {
if (!(regPool[0x17]&(1<<ch))) {
if (regPool[0x18]&0x80 && ch==2) return 0;
float fin=in;
fin*=(float)(regPool[0x18]&15)/20.0f;
return CLAMP(fin,-32768,32767);
}
// taken from dSID
float fin=in;
float fout=0;
float ctf=fakeCutTable[((regPool[0x15]&7)|(regPool[0x16]<<3))&0x7ff];
float reso=(sidIs6581?
((regPool[0x17]>0x5F)?8.0/(float)(regPool[0x17]>>4):1.41):
(pow(2,((float)(4-(float)(regPool[0x17]>>4))/8)))
);
float tmp=fin+fakeBand[ch]*reso+fakeLow[ch];
if (regPool[0x18]&0x40) {
fout-=tmp;
}
tmp=fakeBand[ch]-tmp*ctf;
fakeBand[ch]=tmp;
if (regPool[0x18]&0x20) {
fout-=tmp;
}
tmp=fakeLow[ch]+tmp*ctf;
fakeLow[ch]=tmp;
if (regPool[0x18]&0x10) {
fout+=tmp;
}
fout*=(float)(regPool[0x18]&15)/20.0f;
return CLAMP(fout,-32768,32767);
}
void DivPlatformC64::acquire(short** buf, size_t len) {
int dcOff=(sidCore)?0:sid->get_dc(0);
for (size_t i=0; i<len; i++) {
@ -92,18 +127,18 @@ void DivPlatformC64::acquire(short** buf, size_t len) {
sid_fp->clock(4,&buf[0][i]);
if (++writeOscBuf>=4) {
writeOscBuf=0;
oscBuf[0]->data[oscBuf[0]->needle++]=(sid_fp->lastChanOut[0]-dcOff)>>5;
oscBuf[1]->data[oscBuf[1]->needle++]=(sid_fp->lastChanOut[1]-dcOff)>>5;
oscBuf[2]->data[oscBuf[2]->needle++]=(sid_fp->lastChanOut[2]-dcOff)>>5;
oscBuf[0]->data[oscBuf[0]->needle++]=runFakeFilter(0,(sid_fp->lastChanOut[0]-dcOff)>>5);
oscBuf[1]->data[oscBuf[1]->needle++]=runFakeFilter(1,(sid_fp->lastChanOut[1]-dcOff)>>5);
oscBuf[2]->data[oscBuf[2]->needle++]=runFakeFilter(2,(sid_fp->lastChanOut[2]-dcOff)>>5);
}
} else {
sid->clock();
buf[0][i]=sid->output();
if (++writeOscBuf>=16) {
writeOscBuf=0;
oscBuf[0]->data[oscBuf[0]->needle++]=(sid->last_chan_out[0]-dcOff)>>5;
oscBuf[1]->data[oscBuf[1]->needle++]=(sid->last_chan_out[1]-dcOff)>>5;
oscBuf[2]->data[oscBuf[2]->needle++]=(sid->last_chan_out[2]-dcOff)>>5;
oscBuf[0]->data[oscBuf[0]->needle++]=runFakeFilter(0,(sid->last_chan_out[0]-dcOff)>>5);
oscBuf[1]->data[oscBuf[1]->needle++]=runFakeFilter(1,(sid->last_chan_out[1]-dcOff)>>5);
oscBuf[2]->data[oscBuf[2]->needle++]=runFakeFilter(2,(sid->last_chan_out[2]-dcOff)>>5);
}
}
}
@ -540,6 +575,8 @@ void DivPlatformC64::reset() {
for (int i=0; i<3; i++) {
chan[i]=DivPlatformC64::Channel();
chan[i].std.setEngine(parent);
fakeLow[i]=0;
fakeBand[i]=0;
}
if (sidCore==2) {

4
src/engine/platform/c64.h
View file

@ -56,6 +56,8 @@ class DivPlatformC64: public DivDispatch {
Channel chan[3];
DivDispatchOscBuffer* oscBuf[3];
bool isMuted[3];
float fakeLow[3];
float fakeBand[3];
float fakeCutTable[2048];
struct QueuedWrite {
unsigned char addr;
@ -81,6 +83,8 @@ class DivPlatformC64: public DivDispatch {
friend void putDispatchChip(void*,int);
friend void putDispatchChan(void*,int,int);
inline short runFakeFilter(unsigned char ch, int in);
void acquire_classic(short* bufL, short* bufR, size_t start, size_t len);
void acquire_fp(short* bufL, short* bufR, size_t start, size_t len);