misc fixes and new effects

- fix 8-bit samples
- 0C effect
- E3 effect

src/engine/engine.cpp

@@ -621,15 +621,21 @@ void DivEngine::renderSamples() {
     s->rendLength=(double)s->length/samplePitches[s->pitch];
     s->rendData=new short[s->rendLength];
     int k=0;
-    float mult=(float)(s->vol+100)/100.0f;
+    printf("Volume: %d\n",s->vol);
+    float mult=(float)(s->vol+100)/150.0f;
     for (double j=0; j<s->length; j+=samplePitches[s->pitch]) {
       if (k>=s->rendLength) {
         break;
       }
+      if (s->depth==8) {
+        float next=(float)(s->data[(unsigned int)j]-0x80)*mult;
+        s->rendData[k++]=fmin(fmax(next,-128),127);
+      } else {
         float next=(float)s->data[(unsigned int)j]*mult;
         s->rendData[k++]=fmin(fmax(next,-32768),32767);
       }
     }
+  }
 }
 
 DivInstrument* DivEngine::getIns(int index) {

src/engine/engine.h

@@ -9,7 +9,7 @@ struct DivChannelState {
   std::vector<DivDelayedCommand> delayed;
   int note, pitch, portaSpeed, portaNote;
   int volume, volSpeed, cut, rowDelay, volMax;
-  int vibratoDepth, vibratoRate, vibratoPos;
+  int vibratoDepth, vibratoRate, vibratoPos, vibratoDir;
   int tremoloDepth, tremoloRate, tremoloPos;
   unsigned char arp, arpStage;
   bool doNote, legato;
@@ -26,6 +26,7 @@ struct DivChannelState {
     vibratoDepth(0),
     vibratoRate(0),
     vibratoPos(0),
+    vibratoDir(0),
     tremoloDepth(0),
     tremoloRate(0),
     tremoloPos(0),

src/engine/platform/genesis.cpp

@@ -9,7 +9,11 @@ void DivPlatformGenesis::acquire(int& l, int& r) {
   if (dacMode && dacSample!=-1) {
     if (--dacPeriod<1) {
       DivSample* s=parent->song.sample[dacSample];
+      if (s->depth==8) {
+        writes.emplace(0x2a,(unsigned char)s->rendData[dacPos++]+0x80);
+      } else {
         writes.emplace(0x2a,((unsigned short)s->rendData[dacPos++]+0x8000)>>8);
+      }
       if (dacPos>=s->rendLength) {
         dacSample=-1;
       }

src/engine/playback.cpp

@@ -214,6 +214,9 @@ void DivEngine::processRow(int i, bool afterDelay) {
       case 0x00: // arpeggio
         chan[i].arp=effectVal;
         break;
+      case 0x0c: // retrigger
+        chan[i].rowDelay=effectVal+1;
+        break;
       
       case 0xe1: // portamento up
         chan[i].portaNote=chan[i].note+(effectVal&15);
@@ -223,6 +226,9 @@ void DivEngine::processRow(int i, bool afterDelay) {
         chan[i].portaNote=chan[i].note-(effectVal&15);
         chan[i].portaSpeed=(effectVal>>4)*4;
         break;
+      case 0xe3: // vibrato direction
+        chan[i].vibratoDir=effectVal;
+        break;
       case 0xe5: // pitch
         chan[i].pitch=effectVal-0x80;
         dispatch->dispatch(DivCommand(DIV_CMD_PITCH,i,chan[i].pitch+((chan[i].vibratoDepth*vibTable[chan[i].vibratoPos])>>2)));
@@ -313,6 +319,7 @@ void DivEngine::nextRow() {
   printf("| %.2x:%s | \x1b[1;33m%3d%s\x1b[m\n",curOrder,pb1,curRow,pb3);
 
   for (int i=0; i<chans; i++) {
+    chan[i].rowDelay=0;
     processRow(i,false);
   }
 }
@@ -361,7 +368,18 @@ void DivEngine::nextTick() {
     if (chan[i].vibratoDepth>0) {
       chan[i].vibratoPos+=chan[i].vibratoRate;
       if (chan[i].vibratoPos>=64) chan[i].vibratoPos-=64;
+      switch (chan[i].vibratoDir) {
+        case 1: // up
+          dispatch->dispatch(DivCommand(DIV_CMD_PITCH,i,chan[i].pitch+(MAX(0,chan[i].vibratoDepth*vibTable[chan[i].vibratoPos])>>4)));
+          break;
+        case 2: // down
+          dispatch->dispatch(DivCommand(DIV_CMD_PITCH,i,chan[i].pitch+(MIN(0,chan[i].vibratoDepth*vibTable[chan[i].vibratoPos])>>4)));
+          break;
+        default: // both
           dispatch->dispatch(DivCommand(DIV_CMD_PITCH,i,chan[i].pitch+((chan[i].vibratoDepth*vibTable[chan[i].vibratoPos])>>4)));
+          break;
+      }
+      
     }
     if (chan[i].portaSpeed>0) {
       if (dispatch->dispatch(DivCommand(DIV_CMD_NOTE_PORTA,i,chan[i].portaSpeed,chan[i].portaNote))==2) {