prepare for amiga system

src/engine/platform/amiga.h

@@ -0,0 +1,58 @@
+#ifndef _PCE_H
+#define _PCE_H
+
+#include "../dispatch.h"
+#include <queue>
+#include "../macroInt.h"
+
+class DivPlatformAmiga: public DivDispatch {
+  struct Channel {
+    int freq, baseFreq, pitch;
+    unsigned int audLoc;
+    unsigned short audLen;
+    unsigned int audPos;
+    signed char audDat;
+    int sample;
+    unsigned char ins, note;
+    bool active, insChanged, freqChanged, keyOn, keyOff, inPorta;
+    signed char vol, outVol;
+    DivMacroInt std;
+    Channel():
+      freq(0),
+      baseFreq(0),
+      pitch(0),
+      audLoc(0),
+      audLen(0),
+      audPos(0),
+      audDat(0),
+      sample(-1),
+      ins(-1),
+      note(0),
+      active(false),
+      insChanged(true),
+      freqChanged(false),
+      keyOn(false),
+      keyOff(false),
+      inPorta(false),
+      vol(64),
+      outVol(64) {}
+  };
+  Channel chan[4];
+  bool isMuted[4];
+
+  public:
+    void acquire(short* bufL, short* bufR, size_t start, size_t len);
+    int dispatch(DivCommand c);
+    void reset();
+    void forceIns();
+    void tick();
+    void muteChannel(int ch, bool mute);
+    bool isStereo();
+    bool keyOffAffectsArp(int ch);
+    void setPAL(bool pal);
+    void notifyInsDeletion(void* ins);
+    int init(DivEngine* parent, int channels, int sugRate, bool pal);
+    void quit();
+};
+
+#endif