Engine.h

#ifndef ENGINE_H
#define ENGINE_H

#include "SDL.h"

/** The base engine class **/
class CEngine {

private:
	/** Last iteration's tick value **/
	long m_lLastTick;

	/** Window size **/
	int m_iWidth;
	int m_iHeight;

	/** Has quit been called? **/
	bool m_bQuit;

	/** The title of the window **/
	const char* m_czTitle;

	/** Screen surface **/
	SDL_Surface* m_pScreen;

	/** Is the window minimized? **/
	bool m_bMinimized;

	/** Variables to calculate the frame rate **/
	/** Tick counter **/
	int m_iFPSTickCounter;

	/** Frame rate counter **/
	int m_iFPSCounter;

	/** Stores the last calculated frame rate **/
	int m_iCurrentFPS;

protected:
	void DoThink();
	void DoRender();
	void SetSize(const int& iWidth, const int& iHeight);
	void HandleInput();

public:
	CEngine();
	virtual ~CEngine();

	void Init();
	void Start();

	/** Overloaded - Data that should be initialized when the application starts. **/
	virtual void AdditionalInit() {}

	/** Overloaded - All the games calculation and updating.
		@param iElapsedTime The time in ms elapsed since the function was called last. **/
	virtual void Think(const int& iElapsedTime) {}

	/** Overloaded - All the games rendering.
		@param pDestSurface The main screen surface. **/
	virtual void Render(SDL_Surface* pDestSurface) {}

	/** Overloaded - Allocated data that should be cleaned up. **/
	virtual void End() {}

	/** Overloaded - Window is active again **/
	virtual void WindowActive() {}

	/** Overloaded - Window is inactive **/
	virtual void WindowInactive() {}

	/** Overloaded - Keyboard key has been released.
		@param iKeyEnum The key number. **/
	virtual void KeyUp(const int& iKeyEnum) {}

	/** Overloaded - Keyboard key has just been pressed.
		@param iKeyEnum The key number. **/
	virtual void KeyDown(const int& iKeyEnum) {}

	/** Overloaded - The mouse has been moved.
		@param iButton Specifies if a mouse button is pressed.
		@param iX The mouse position on the X-axis in pixels.
		@param iY The mouse position on the Y-axis in pixels.
		@param iRelX The mouse position on the X-axis relative to the last position.
		@param iRelY The mouse position on the Y-axis relative to the last position. **/
	virtual void MouseMoved(const int& iButton,
							const int& iX,
							const int& iY,
							const int& iRelX,
							const int& iRelY) {}

	/** Overloaded - A mouse button has been released.
		@param iButton Specifies if a mouse button is pressed.
		@param iX The mouse position on the X-axis in pixels.
		@param iY The mouse position on the Y-axis in pixels.
		@param iRelX The mouse position on the X-axis relative to the last position.
		@param iRelY The mouse position on the Y-axis relative to the last position. **/
	virtual void MouseButtonUp(const int& iButton,
							   const int& iX,
						   	   const int& iY,
						       const int& iRelX,
							   const int& iRelY) {}

	/** Overloaded - A mouse button has been pressed.
		@param iButton Specifies if a mouse button is pressed.
		@param iX The mouse position on the X-axis in pixels.
		@param iY The mouse position on the Y-axis in pixels.
		@param iRelX The mouse position on the X-axis relative to the last position.
		@param iRelY The mouse position on the Y-axis relative to the last position. **/
	virtual void MouseButtonDown(const int& iButton,
							     const int& iX,
						   	     const int& iY,
						         const int& iRelX,
							     const int& iRelY) {}

	void         SetTitle(const char* czTitle);
	const char*  GetTitle();

	SDL_Surface* GetSurface();
	int          getFPS();

};

#endif // ENGINE_H