total extinction of legacy sample mode, part 4

prepare the conversion code...

src/engine/fileOps/dmf.cpp

@@ -1166,6 +1166,9 @@ bool DivEngine::loadDMF(unsigned char* file, size_t len) {
       ds.systemFlags[0].set("brokenPitch",true);
     }
 
+    // always convert to normal sample mode (I have no idea how will I do export)
+    ds.convertLegacySampleMode();
+
     ds.systemName=getSongSystemLegacyName(ds,!getConfInt("noMultiSystem",0));
 
     if (active) quitDispatch();

src/engine/fileOps/fur.cpp

@@ -2181,6 +2181,11 @@ bool DivEngine::loadFur(unsigned char* file, size_t len, int variantID) {
       addWarning("this song used partial pitch linearity, which has been removed from Furnace. you may have to adjust your song.");
     }
 
+    // removal of legacy sample mode
+    if (ds.version<239) {
+      ds.convertLegacySampleMode();
+    }
+
     if (active) quitDispatch();
     BUSY_BEGIN_SOFT;
     saveLock.lock();

src/engine/song.cpp

@@ -729,3 +729,9 @@ void DivSong::unload() {
   }
   subsong.clear();
 }
+
+// from this point onwards, a mess.
+
+void DivSong::convertLegacySampleMode() {
+
+}

src/engine/song.h

@@ -408,6 +408,11 @@ struct DivSong {
    */
   void findSubSongs(int chans);
 
+  /**
+   * try to convert usage of legacy sample mode into normal mode.
+   */
+   void convertLegacySampleMode();
+
   /**
    * clear orders and patterns.
    */