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/dispatch.h

@@ -0,0 +1,31 @@
+enum DivDispatchCmds {
+  DIV_CMD_NOTE_ON=0,
+  DIV_CMD_NOTE_OFF,
+  DIV_CMD_INSTRUMENT,
+  DIV_CMD_VOLUME,
+  DIV_CMD_PITCH_UP,
+  DIV_CMD_PITCH_DOWN,
+  DIV_CMD_PITCH_TO
+};
+
+struct DivCommand {
+  DivDispatchCmds cmd;
+};
+
+struct DivDelayedCommand {
+  int ticks;
+  DivCommand cmd;
+};
+
+class DivDispatch {
+  public:
+    virtual void acquire(float& l, float& r);
+    virtual int dispatch(DivCommand c);
+
+    /**
+     * initialize this DivDispatch.
+     * @param channels the number of channels to acquire.
+     * @return the number of channels allocated.
+     */
+    virtual int init(int channels);
+};