Virtual Boy: add static wave storage mode

src/engine/platform/vb.cpp

@@ -123,6 +123,7 @@ void DivPlatformVB::acquire(short** buf, size_t len) {
 }
 
 void DivPlatformVB::updateWave(int ch) {
+  if (romMode) return;
   if (ch>=5) return;
 
   for (int i=0; i<32; i++) {
@@ -162,6 +163,9 @@ void DivPlatformVB::tick(bool sysTick) {
     if (chan[i].std.wave.had) {
       if (chan[i].wave!=chan[i].std.wave.val || chan[i].ws.activeChanged()) {
         chan[i].wave=chan[i].std.wave.val;
+        if (romMode) {
+          chWrite(i,0x06,chan[i].wave);
+        }
         chan[i].ws.changeWave1(chan[i].wave);
         if (!chan[i].keyOff) chan[i].keyOn=true;
       }
@@ -282,6 +286,9 @@ int DivPlatformVB::dispatch(DivCommand c) {
     case DIV_CMD_WAVE:
       chan[c.chan].wave=c.value;
       chan[c.chan].ws.changeWave1(chan[c.chan].wave);
+      if (romMode) {
+        chWrite(c.chan,0x06,chan[c.chan].wave);
+      }
       chan[c.chan].keyOn=true;
       break;
     case DIV_CMD_NOTE_PORTA: {
@@ -464,8 +471,13 @@ void DivPlatformVB::reset() {
     chWrite(i,0x01,isMuted[i]?0:chan[i].pan);
     chWrite(i,0x05,0x00);
     chWrite(i,0x00,0x80);
-    chWrite(i,0x06,i);
+    if (romMode) {
+      chWrite(i,0x06,0);
+    } else {
+      chWrite(i,0x06,i);
+    }
   }
+  updateROMWaves();
   delay=500;
 }
 
@@ -481,6 +493,27 @@ float DivPlatformVB::getPostAmp() {
   return 6.0f;
 }
 
+void DivPlatformVB::updateROMWaves() {
+  if (romMode) {
+    // copy wavetables
+    for (int i=0; i<5; i++) {
+      int data=0;
+      DivWavetable* w=parent->getWave(i);
+
+      for (int j=0; j<32; j++) {
+        if (w->max<1 || w->len<1) {
+          data=0;
+        } else {
+          data=w->data[j*w->len/32]*63/w->max;
+          if (data<0) data=0;
+          if (data>63) data=63;
+        }
+        rWrite((i<<7)+(j<<2),data);
+      }
+    }
+  }
+}
+
 void DivPlatformVB::notifyWaveChange(int wave) {
   for (int i=0; i<6; i++) {
     if (chan[i].wave==wave) {
@@ -488,6 +521,7 @@ void DivPlatformVB::notifyWaveChange(int wave) {
       updateWave(i);
     }
   }
+  updateROMWaves();
 }
 
 void DivPlatformVB::notifyInsDeletion(void* ins) {
@@ -504,6 +538,8 @@ void DivPlatformVB::setFlags(const DivConfig& flags) {
     oscBuf[i]->rate=rate;
   }
 
+  romMode=flags.getBool("romMode",false);
+
   if (vb!=NULL) {
     delete vb;
     vb=NULL;

src/engine/platform/vb.h

@@ -57,10 +57,12 @@ class DivPlatformVB: public DivDispatch {
   int tempR;
   unsigned char modulation;
   bool modType;
+  bool romMode;
   signed char modTable[32];
   VSU* vb;
   unsigned char regPool[0x600];
   void updateWave(int ch);
+  void updateROMWaves();
   void writeEnv(int ch, bool upperByteToo=false);
   friend void putDispatchChip(void*,int);
   friend void putDispatchChan(void*,int,int);

src/gui/sysConf.cpp

@@ -2242,10 +2242,31 @@ bool FurnaceGUI::drawSysConf(int chan, int sysPos, DivSystem type, DivConfig& fl
       }
       break;
     }
+    case DIV_SYSTEM_VBOY: {
+      bool romMode=flags.getBool("romMode",false);
+
+      ImGui::Text("Waveform storage mode:");
+      ImGui::Indent();
+      if (ImGui::RadioButton("Dynamic (unconfirmed)",!romMode)) {
+        romMode=false;
+        altered=true;
+      }
+      if (ImGui::RadioButton("Static (up to 5 waves)",romMode)) {
+        romMode=true;
+        altered=true;
+      }
+      ImGui::Unindent();
+
+      if (altered) {
+        e->lockSave([&]() {
+          flags.set("romMode",romMode);
+        });
+      }
+      break;
+    }
     case DIV_SYSTEM_SWAN:
     case DIV_SYSTEM_BUBSYS_WSG:
     case DIV_SYSTEM_PET:
-    case DIV_SYSTEM_VBOY:
     case DIV_SYSTEM_GA20:
     case DIV_SYSTEM_PV1000:
     case DIV_SYSTEM_VERA: