dev113 - loop detection changes

src/engine/engine.cpp

@@ -1658,6 +1658,7 @@ void DivEngine::playSub(bool preserveDrift, int goalRow) {
   speedAB=false;
   playing=true;
   skipping=true;
+  memset(walked,0,8192);
   for (int i=0; i<song.systemLen; i++) disCont[i].dispatch->setSkipRegisterWrites(true);
   while (playing && curOrder<goal) {
     if (nextTick(preserveDrift)) {

src/engine/engine.h

@@ -46,9 +46,8 @@
 #define BUSY_BEGIN_SOFT softLocked=true; isBusy.lock();
 #define BUSY_END isBusy.unlock(); softLocked=false;
 
-#define DIV_VERSION "dev112"
-#define DIV_ENGINE_VERSION 112
-
+#define DIV_VERSION "dev113"
+#define DIV_ENGINE_VERSION 113
 // for imports
 #define DIV_VERSION_MOD 0xff01
 #define DIV_VERSION_FC 0xff02
@@ -358,6 +357,8 @@ class DivEngine {
   double exportFadeOut;
   std::map<String,String> conf;
   std::deque<DivNoteEvent> pendingNotes;
+  // bitfield
+  unsigned char walked[8192];
   bool isMuted[DIV_MAX_CHANS];
   std::mutex isBusy, saveLock;
   String configPath;
@@ -1072,6 +1073,7 @@ class DivEngine {
       memset(reversePitchTable,0,4096*sizeof(int));
       memset(pitchTable,0,4096*sizeof(int));
       memset(sysDefs,0,256*sizeof(void*));
+      memset(walked,0,8192);
 
       for (int i=0; i<256; i++) {
         sysFileMapFur[i]=DIV_SYSTEM_NULL;

src/engine/fileOps.cpp

@@ -179,6 +179,7 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
     ds.brokenPortaArp=false;
     ds.snNoLowPeriods=true;
     ds.delayBehavior=0;
+    ds.jumpTreatment=2;
 
     // 1.1 compat flags
     if (ds.version>24) {
@@ -1081,6 +1082,9 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
     if (ds.version<110) {
       ds.delayBehavior=1;
     }
+    if (ds.version<113) {
+      ds.jumpTreatment=1;
+    }
     ds.isDMF=false;
 
     reader.readS(); // reserved
@@ -1503,7 +1507,12 @@ bool DivEngine::loadFur(unsigned char* file, size_t len) {
       } else {
         reader.readC();
       }
-      for (int i=0; i<5; i++) {
+      if (ds.version>=113) {
+        ds.jumpTreatment=reader.readC();
+      } else {
+        reader.readC();
+      }
+      for (int i=0; i<4; i++) {
         reader.readC();
       }
     }
@@ -3747,7 +3756,8 @@ SafeWriter* DivEngine::saveFur(bool notPrimary) {
   w->writeC(song.brokenPortaArp);
   w->writeC(song.snNoLowPeriods);
   w->writeC(song.delayBehavior);
-  for (int i=0; i<5; i++) {
+  w->writeC(song.jumpTreatment);
+  for (int i=0; i<4; i++) {
     w->writeC(0);
   }
 

src/engine/playback.cpp

@@ -31,7 +31,9 @@ void DivEngine::nextOrder() {
   curRow=0;
   if (repeatPattern) return;
   if (++curOrder>=curSubSong->ordersLen) {
+    logV("end of orders reached");
     endOfSong=true;
+    memset(walked,0,8192);
     curOrder=0;
   }
 }
@@ -348,15 +350,31 @@ void DivEngine::processRow(int i, bool afterDelay) {
           if (effectVal>0) speed2=effectVal;
           break;
         case 0x0b: // change order
-          if (changeOrd==-1) {
+          if (changeOrd==-1 || song.jumpTreatment==0) {
             changeOrd=effectVal;
-            changePos=0;
+            if (song.jumpTreatment==1 || song.jumpTreatment==2) {
+              changePos=0;
+            }
           }
           break;
         case 0x0d: // next order
-          if (changeOrd<0 && (curOrder<(curSubSong->ordersLen-1) || !song.ignoreJumpAtEnd)) {
-            changeOrd=-2;
-            changePos=effectVal;
+          if (song.jumpTreatment==2) {
+            if ((curOrder<(curSubSong->ordersLen-1) || !song.ignoreJumpAtEnd)) {
+              changeOrd=-2;
+              changePos=effectVal;
+            }
+          } else if (song.jumpTreatment==1) {
+            if (changeOrd<0 && (curOrder<(curSubSong->ordersLen-1) || !song.ignoreJumpAtEnd)) {
+              changeOrd=-2;
+              changePos=effectVal;
+            }
+          } else {
+            if (curOrder<(curSubSong->ordersLen-1) || !song.ignoreJumpAtEnd) {
+              if (changeOrd<0) {
+                changeOrd=-2;
+              }
+              changePos=effectVal;
+            }
           }
           break;
         case 0xed: // delay
@@ -911,18 +929,23 @@ void DivEngine::nextRow() {
     processRow(i,false);
   }
 
+  walked[((curOrder<<5)+(curRow>>3))&8191]|=1<<(curRow&7);
+
   if (changeOrd!=-1) {
     if (repeatPattern) {
       curRow=0;
       changeOrd=-1;
     } else {
       curRow=changePos;
+      changePos=0;
       if (changeOrd==-2) changeOrd=curOrder+1;
-      if (changeOrd<=curOrder) endOfSong=true;
+      // old loop detection routine
+      //if (changeOrd<=curOrder) endOfSong=true;
       curOrder=changeOrd;
       if (curOrder>=curSubSong->ordersLen) {
         curOrder=0;
         endOfSong=true;
+        memset(walked,0,8192);
       }
       changeOrd=-1;
     }
@@ -932,6 +955,13 @@ void DivEngine::nextRow() {
     if (haltOn==DIV_HALT_PATTERN) halted=true;
   }
 
+  // new loop detection routine
+  if (!endOfSong && walked[((curOrder<<5)+(curRow>>3))&8191]&(1<<(curRow&7))) {
+    logV("loop reached");
+    endOfSong=true;
+    memset(walked,0,8192);
+  }
+
   if (song.brokenSpeedSel) {
     if ((curSubSong->patLen&1) && curOrder&1) {
       ticks=((curRow&1)?speed2:speed1)*(curSubSong->timeBase+1);

src/engine/song.h

@@ -468,6 +468,11 @@ struct DivSong {
   // 1: broken (don't allow value higher than speed)
   // 2: lax (allow value higher than speed)
   unsigned char delayBehavior;
+  // 0B/0D treatment
+  // 0: normal (0B/0D accepted)
+  // 1: old Furnace (first one accepted)
+  // 2: DefleMask (0D takes priority over 0B)
+  unsigned char jumpTreatment;
   bool properNoiseLayout;
   bool waveDutyIsVol;
   bool resetMacroOnPorta;
@@ -571,6 +576,7 @@ struct DivSong {
     pitchSlideSpeed(4),
     loopModality(2),
     delayBehavior(2),
+    jumpTreatment(0),
     properNoiseLayout(true),
     waveDutyIsVol(false),
     resetMacroOnPorta(false),