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VRC6: acquireDirect()

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to-do: check for regressions? I need to sleep
This commit is contained in:
tildearrow 2025-03-07 06:28:03 -05:00
parent 0efe232ae8
commit 229003c597
4 changed files with 83 additions and 34 deletions
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33
src/engine/platform/vrc6.cpp
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@ -46,16 +46,28 @@ const char** DivPlatformVRC6::getRegisterSheet() {
return regCheatSheetVRC6;
}
void DivPlatformVRC6::acquire(short** buf, size_t len) {
void DivPlatformVRC6::acquireDirect(blip_buffer_t** bb, size_t len) {
for (int i=0; i<3; i++) {
oscBuf[i]->begin(len);
}
for (size_t h=0; h<len; h++) {
// running heuristic
int advance=vrc6.predict();
if ((int)(len-h)<advance) advance=len-h;
for (int i=0; i<2; i++) {
if (chan[i].pcm && chan[i].dacSample!=-1) {
if (chan[i].dacRate<=0) continue;
int remainTime=(rate-chan[i].dacPeriod+chan[i].dacRate-1)/chan[i].dacRate;
if (remainTime<advance) advance=remainTime;
if (remainTime<1) advance=1;
}
}
// PCM part
for (int i=0; i<2; i++) {
if (chan[i].pcm && chan[i].dacSample!=-1) {
chan[i].dacPeriod+=chan[i].dacRate;
chan[i].dacPeriod+=chan[i].dacRate*advance;
if (chan[i].dacPeriod>rate) {
DivSample* s=parent->getSample(chan[i].dacSample);
if (s->samples<=0 || chan[i].dacPos>=s->samples) {
@ -81,11 +93,13 @@ void DivPlatformVRC6::acquire(short** buf, size_t len) {
}
// VRC6 part
vrc6.tick();
vrc6.tick(advance);
h+=advance-1;
int sample=vrc6.out()<<9; // scale to 16 bit
if (sample>32767) sample=32767;
if (sample<-32768) sample=-32768;
buf[0][h]=sample;
if (sample!=prevSample) {
blip_add_delta(bb[0],h,sample-prevSample);
prevSample=sample;
}
// Oscilloscope buffer part
if (++writeOscBuf>=32) {
@ -96,7 +110,7 @@ void DivPlatformVRC6::acquire(short** buf, size_t len) {
oscBuf[2]->putSample(h,vrc6.sawtooth_out()<<10);
}
// Command part
// Command part (what the heck why at the END?!)
while (!writes.empty()) {
QueuedWrite w=writes.front();
switch (w.addr&0xf000) {
@ -523,6 +537,7 @@ void DivPlatformVRC6::reset() {
}
sampleBank=0;
prevSample=0;
vrc6.reset();
// Initialize control register
@ -537,6 +552,10 @@ bool DivPlatformVRC6::keyOffAffectsArp(int ch) {
return true;
}
bool DivPlatformVRC6::hasAcquireDirect() {
return true;
}
void DivPlatformVRC6::setFlags(const DivConfig& flags) {
int clockSel=flags.getInt("clockSel",0);
if (clockSel==2) { // Dendy