core quality, part 3 - final

- SAA1099
- SCC
- SM8521
- Swan
- Virtual Boy

src/engine/platform/saa.cpp

@@ -455,7 +455,7 @@ void DivPlatformSAA1099::setFlags(const DivConfig& flags) {
     chipClock=8000000;
   }
   CHECK_CUSTOM_CLOCK;
-  rate=chipClock/32;
+  rate=chipClock/coreQuality;
 
   for (int i=0; i<6; i++) {
     oscBuf[i]->rate=rate;
@@ -473,6 +473,32 @@ void DivPlatformSAA1099::poke(std::vector<DivRegWrite>& wlist) {
   for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
 }
 
+void DivPlatformSAA1099::setCoreQuality(unsigned char q) {
+  switch (q) {
+    case 0:
+      coreQuality=256;
+      break;
+    case 1:
+      coreQuality=128;
+      break;
+    case 2:
+      coreQuality=64;
+      break;
+    case 3:
+      coreQuality=32;
+      break;
+    case 4:
+      coreQuality=8;
+      break;
+    case 5:
+      coreQuality=1;
+      break;
+    default:
+      coreQuality=32;
+      break;
+  }
+}
+
 int DivPlatformSAA1099::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
   parent=p;
   dumpWrites=false;