NES system! almost

src/engine/platform/nes.h

@@ -0,0 +1,45 @@
+#ifndef _APU_H
+#define _APU_H
+
+#include "../dispatch.h"
+#include "../macroInt.h"
+
+class DivPlatformNES: public DivDispatch {
+  struct Channel {
+    int freq, baseFreq, pitch, prevFreq;
+    unsigned char ins, note, duty, sweep;
+    bool active, insChanged, freqChanged, sweepChanged, keyOn, keyOff, inPorta;
+    signed char vol, outVol, wave;
+    DivMacroInt std;
+    Channel():
+      freq(0),
+      baseFreq(0),
+      pitch(0),
+      prevFreq(-1),
+      ins(-1),
+      note(0),
+      duty(0),
+      sweep(0),
+      active(false),
+      insChanged(true),
+      freqChanged(false),
+      sweepChanged(false),
+      keyOn(false),
+      keyOff(false),
+      inPorta(false),
+      vol(15),
+      wave(-1) {}
+  };
+  Channel chan[5];
+  int dacPeriod, dacRate, dacPos, dacSample;
+  unsigned char lastPan;
+
+  void updateWave();
+  public:
+    void acquire(int& l, int& r);
+    int dispatch(DivCommand c);
+    void tick();
+    int init(DivEngine* parent, int channels, int sugRate);
+};
+
+#endif