Amiga: acquireDirect, part 3

This commit is contained in:
tildearrow 2025-03-05 15:26:17 -05:00
parent 69a43a70fc
commit ec451cd80e

View file

@ -80,131 +80,6 @@ const char** DivPlatformAmiga::getRegisterSheet() {
}
void DivPlatformAmiga::acquire(short** buf, size_t len) {
thread_local int outL, outR, output;
for (int i=0; i<4; i++) {
oscBuf[i]->begin(len);
}
for (size_t h=0; h<len; h++) {
delay-=AMIGA_DIVIDER;
if (delay<0) delay=0;
if (!writes.empty() && delay<=0) {
QueuedWrite w=writes.front();
if (w.addr==0x96 && !(w.val&0x8000)) delay=6144;
amiga.write(w.addr,w.val);
writes.pop();
}
bool hsync=bypassLimits;
outL=0;
outR=0;
// TODO:
// - improve DMA overrun behavior
// - does V/P mod really work like that?
amiga.volPos=(amiga.volPos+1)&AMIGA_VPMASK;
if (!bypassLimits) {
amiga.hPos+=AMIGA_DIVIDER;
if (amiga.hPos>=228) {
amiga.hPos-=228;
hsync=true;
}
}
for (int i=0; i<4; i++) {
// run DMA
if (amiga.audEn[i]) amiga.mustDMA[i]=true;
if (amiga.dmaEn && amiga.mustDMA[i] && !amiga.audIr[i]) {
amiga.audTick[i]-=AMIGA_DIVIDER;
if (amiga.audTick[i]<0) {
amiga.audTick[i]+=MAX(AMIGA_DIVIDER,amiga.audPer[i]);
if (amiga.audByte[i]) {
// read next samples
if (!amiga.incLoc[i]) {
amiga.audDat[0][i]=sampleMem[(amiga.dmaLoc[i])&chipMask];
amiga.audDat[1][i]=sampleMem[(amiga.dmaLoc[i]+1)&chipMask];
amiga.incLoc[i]=true;
}
amiga.audWord[i]=!amiga.audWord[i];
}
amiga.mustDMA[i]=amiga.audEn[i];
amiga.audByte[i]=!amiga.audByte[i];
if (!amiga.audByte[i] && (amiga.useV[i] || amiga.useP[i])) {
amiga.nextOut2[i]=((unsigned char)amiga.audDat[0][i])<<8|((unsigned char)amiga.audDat[1][i]);
if (i<3) {
if (amiga.useV[i] && amiga.useP[i]) {
if (amiga.audWord[i]) {
amiga.audPer[i+1]=amiga.nextOut2[i];
} else {
amiga.audVol[i+1]=amiga.nextOut2[i];
}
} else if (amiga.useV[i]) {
amiga.audVol[i+1]=amiga.nextOut2[i];
} else {
amiga.audPer[i+1]=amiga.nextOut2[i];
}
}
} else if (!amiga.useV[i] && !amiga.useP[i]) {
amiga.nextOut[i]=amiga.audDat[amiga.audByte[i]][i];
}
}
if (hsync) {
if (amiga.incLoc[i]) {
amiga.incLoc[i]=false;
amiga.dmaLoc[i]+=2;
// check for length
if ((--amiga.dmaLen[i])==0) {
if (amiga.audInt[i]) {
amiga.audIr[i]=true;
irq(i);
}
amiga.dmaLoc[i]=amiga.audLoc[i];
amiga.dmaLen[i]=amiga.audLen[i];
}
}
}
}
// output
if (!isMuted[i]) {
if ((amiga.audVol[i]&127)>=64) {
output=amiga.nextOut[i]<<6;
} else if ((amiga.audVol[i]&127)==0) {
output=0;
} else {
output=amiga.nextOut[i]*volTable[amiga.audVol[i]&63][amiga.volPos];
}
if (i==0 || i==3) {
outL+=(output*sep1)>>7;
outR+=(output*sep2)>>7;
} else {
outL+=(output*sep2)>>7;
outR+=(output*sep1)>>7;
}
oscBuf[i]->putSample(h,(amiga.nextOut[i]*MIN(64,amiga.audVol[i]&127))<<1);
} else {
// TODO: we can remove this!
oscBuf[i]->putSample(h,0);
}
}
filter[0][0]+=(filtConst*(outL-filter[0][0]))>>12;
filter[0][1]+=(filtConst*(filter[0][0]-filter[0][1]))>>12;
filter[1][0]+=(filtConst*(outR-filter[1][0]))>>12;
filter[1][1]+=(filtConst*(filter[1][0]-filter[1][1]))>>12;
buf[0][h]=filter[0][1];
buf[1][h]=filter[1][1];
}
for (int i=0; i<4; i++) {
oscBuf[i]->end(len);
}
}
void DivPlatformAmiga::acquireDirect(blip_buffer_t** bb, size_t off, size_t len) {
@ -220,31 +95,27 @@ void DivPlatformAmiga::acquireDirect(blip_buffer_t** bb, size_t off, size_t len)
// skip heuristic
runCount=len-h;
//logI("FRAME START - at most %d",runCount);
/*
if (!bypassLimits) {
if ((228-amiga.hPos)<runCount) {
runCount=(228-amiga.hPos);
logV("HPOS: setting the runCount to %d",runCount);
}
}*/
if (delay<runCount) {
if (!writes.empty()) {
runCount=delay;
//logV("DELAY: setting the runCount to %d",runCount);
}
}
for (int i=0; i<4; i++) {
if (!amiga.mustDMA[i] && !amiga.audEn[i]) continue;
if (amiga.audTick[i]<runCount) {
runCount=amiga.audTick[i];
//logV("AUDTICK[%d]: setting the runCount to %d",i,runCount);
}
}
for (int i=0; i<4; i++) {
if (amiga.incLoc[i] && (bypassLimits)) {
//logV("WILL COUNT because %d+%d>=228",amiga.hPos,runCount);
runCount=1;
break;
if (bypassLimits) {
for (int i=0; i<4; i++) {
if (amiga.incLoc[i]) {
runCount=1;
break;
}
}
} else {
if (228-amiga.hPos<runCount) {
runCount=228-amiga.hPos;
}
}
if (runCount>0) {
@ -253,7 +124,6 @@ void DivPlatformAmiga::acquireDirect(blip_buffer_t** bb, size_t off, size_t len)
} else {
runCount=1;
}
//logV("runCount: %d",runCount);
delay-=runCount;
if (delay<0) delay=0;