dev96 - add virtual tempo

src/engine/engine.cpp

@@ -1068,6 +1068,7 @@ void DivEngine::playSub(bool preserveDrift, int goalRow) {
     endOfSong=false;
   } else {
     ticks=1;
+    tempoAccum=0;
     totalTicks=0;
     totalSeconds=0;
     totalTicksR=0;
@@ -2669,6 +2670,7 @@ void DivEngine::quitDispatch() {
   speedAB=false;
   endOfSong=false;
   ticks=0;
+  tempoAccum=0;
   curRow=0;
   curOrder=0;
   nextSpeed=3;

src/engine/engine.h

@@ -45,8 +45,8 @@
 #define BUSY_BEGIN_SOFT softLocked=true; isBusy.lock();
 #define BUSY_END isBusy.unlock(); softLocked=false;
 
-#define DIV_VERSION "dev95"
-#define DIV_ENGINE_VERSION 95
+#define DIV_VERSION "dev96"
+#define DIV_ENGINE_VERSION 96
 
 // for imports
 #define DIV_VERSION_MOD 0xff01
@@ -312,6 +312,7 @@ class DivEngine {
   int changeOrd, changePos, totalSeconds, totalTicks, totalTicksR, totalCmds, lastCmds, cmdsPerSecond, globalPitch;
   unsigned char extValue;
   unsigned char speed1, speed2;
+  short tempoAccum;
   DivStatusView view;
   DivHaltPositions haltOn;
   DivChannelState chan[DIV_MAX_CHANS];
@@ -942,6 +943,7 @@ class DivEngine {
       extValue(0),
       speed1(3),
       speed2(3),
+      tempoAccum(0),
       view(DIV_STATUS_NOTHING),
       haltOn(DIV_HALT_NONE),
       audioEngine(DIV_AUDIO_NULL),

src/engine/fileOps.cpp

@@ -1404,11 +1404,19 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       } else {
         reader.readC();
       }
-      for (int i=0; i<18; i++) {
+      for (int i=0; i<14; i++) {
         reader.readC();
       }
     }
 
+    // first song virtual tempo
+    if (ds.version>=96) {
+      subSong->virtualTempoN=reader.readS();
+      subSong->virtualTempoD=reader.readS();
+    } else {
+      reader.readI();
+    }
+
     // subsongs
     if (ds.version>=95) {
       subSong->name=reader.readString();
@@ -1457,7 +1465,12 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
         subSong->hilightA=reader.readC();
         subSong->hilightB=reader.readC();
 
-        reader.readI(); // reserved
+        if (ds.version>=96) {
+          subSong->virtualTempoN=reader.readS();
+          subSong->virtualTempoD=reader.readS();
+        } else {
+          reader.readI();
+        }
 
         subSong->name=reader.readString();
         subSong->notes=reader.readString();
@@ -2858,9 +2871,13 @@ SafeWriter* DivEngine::saveFur(bool notPrimary) {
   w->writeC(song.snDutyReset);
   w->writeC(song.pitchMacroIsLinear);
   w->writeC(song.pitchSlideSpeed);
-  for (int i=0; i<18; i++) {
+  for (int i=0; i<14; i++) {
     w->writeC(0);
   }
+
+  // first subsong virtual tempo
+  w->writeS(subSong->virtualTempoN);
+  w->writeS(subSong->virtualTempoD);
   
   // subsong list
   w->writeString(subSong->name,false);
@@ -2891,7 +2908,8 @@ SafeWriter* DivEngine::saveFur(bool notPrimary) {
     w->writeS(subSong->ordersLen);
     w->writeC(subSong->hilightA);
     w->writeC(subSong->hilightB);
-    w->writeI(0); // reserved
+    w->writeS(subSong->virtualTempoN);
+    w->writeS(subSong->virtualTempoD);
 
     w->writeString(subSong->name,false);
     w->writeString(subSong->notes,false);
@@ -3171,6 +3189,14 @@ SafeWriter* DivEngine::saveDMF(unsigned char version) {
     addWarning("only the currently selected subsong will be saved");
   }
 
+  if (curSubSong->virtualTempoD!=curSubSong->virtualTempoN) {
+    addWarning(".dmf format does not support virtual tempo");
+  }
+
+  if (song.tuning<439.99 && song.tuning>440.01) {
+    addWarning(".dmf format does not support tuning");
+  }
+
   if (sys==DIV_SYSTEM_C64_6581 || sys==DIV_SYSTEM_C64_8580) {
     addWarning("absolute duty/cutoff macro not available in .dmf!");
     addWarning("duty precision will be lost");

src/engine/playback.cpp

@@ -900,16 +900,23 @@ bool DivEngine::nextTick(bool noAccum, bool inhibitLowLat) {
   if (!freelance) {
     if (--subticks<=0) {
       subticks=tickMult;
-      if (stepPlay!=1) if (--ticks<=0) {
-        ret=endOfSong;
-        if (endOfSong) {
-          if (song.loopModality!=2) {
-            playSub(true);
+      if (stepPlay!=1) {
+        tempoAccum+=curSubSong->virtualTempoN;
+        while (tempoAccum>=curSubSong->virtualTempoD) {
+          tempoAccum-=curSubSong->virtualTempoD;
+          if (--ticks<=0) {
+            ret=endOfSong;
+            if (endOfSong) {
+              if (song.loopModality!=2) {
+                playSub(true);
+              }
+            }
+            endOfSong=false;
+            if (stepPlay==2) stepPlay=1;
+            nextRow();
+            break;
           }
         }
-        endOfSong=false;
-        if (stepPlay==2) stepPlay=1;
-        nextRow();
       }
       // process stuff
       for (int i=0; i<chans; i++) {

src/engine/song.h

@@ -114,6 +114,7 @@ struct DivSubSong {
   String name, notes;
   unsigned char hilightA, hilightB;
   unsigned char timeBase, speed1, speed2, arpLen;
+  short virtualTempoN, virtualTempoD;
   bool pal;
   bool customTempo;
   float hz;
@@ -136,6 +137,8 @@ struct DivSubSong {
     speed1(6),
     speed2(6),
     arpLen(1),
+    virtualTempoN(150),
+    virtualTempoD(150),
     pal(true),
     customTempo(false),
     hz(60.0),