initial commit

took me a day to make the base...
...and ~12 hours to write a reader that reads 100% of all demo songs in
1.0

src/engine/engine.h

@@ -0,0 +1,35 @@
+#include "song.h"
+#include "dispatch.h"
+#include "../audio/taAudio.h"
+
+struct DivChannelState {
+  std::vector<DivDelayedCommand> delayed;
+  int rampSpeed, portaSpeed, portaNote;
+  int volSpeed;
+  int vibratoDepth, vibratoRate;
+  int tremoloDepth, tremoloRate;
+};
+
+class DivEngine {
+  DivSong song;
+  DivDispatch* dispatch;
+  TAAudio* output;
+  TAAudioDesc want, got;
+  int chans;
+  bool playing;
+  bool speedAB;
+  int ticks, curRow, curOrder;
+  std::vector<DivChannelState> chan;
+
+  public:
+    // load a .dmf.
+    bool load(void* f, size_t length);
+    // save as .dmf.
+    bool save(FILE* f);
+
+    // play
+    void play();
+
+    // initialize the engine.
+    bool init();    
+};