Added FSM and Game State Manager

src/game/StateMachine.h

@@ -0,0 +1,64 @@
+#ifndef _STATE_MACHINE_H
+#define _STATE_MACHINE_H
+#include <stdio.h>
+// =============================================================================
+// Do NOT modify this file, instead make custom changes in the GameStateManager
+// or create your own StateMachine including and implementing this header
+// =============================================================================
+class EventData 
+{
+public:
+    virtual ~EventData() {};  
+};
+
+struct StateStruct;
+ 
+// base class for state machines
+class StateMachine
+{
+public:
+    StateMachine(unsigned char maxStates);
+    virtual ~StateMachine() {}
+//     unsigned char getCurrentState();
+    unsigned char currentState;
+protected:
+    enum { EVENT_IGNORED = 0xFE, CANNOT_HAPPEN };
+    void ExternalEvent(unsigned char, EventData* = NULL);
+    void InternalEvent(unsigned char, EventData* = NULL);
+    virtual const StateStruct* GetStateMap() = 0;
+private:
+    const unsigned char _maxStates;
+    bool _eventGenerated;
+    EventData* _pEventData;
+    void StateEngine(void);
+};
+ 
+typedef void (StateMachine::*StateFunc)(EventData *);
+struct StateStruct 
+{
+    StateFunc pStateFunc;    
+};
+ 
+#define BEGIN_STATE_MAP \
+public:\
+const StateStruct* GetStateMap() {\
+    static const StateStruct StateMap[] = { 
+ 
+#define STATE_MAP_ENTRY(stateFunc)\
+    { reinterpret_cast<StateFunc>(stateFunc) },
+ 
+#define END_STATE_MAP \
+    }; \
+    return &StateMap[0]; }
+ 
+#define BEGIN_TRANSITION_MAP \
+    static const unsigned char TRANSITIONS[] = {\
+ 
+#define TRANSITION_MAP_ENTRY(entry)\
+    entry,
+ 
+#define END_TRANSITION_MAP(data) \
+    0 };\
+    ExternalEvent(TRANSITIONS[currentState], data);
+ 
+#endif //STATE_MACHINE_H