Engine.h

// Engine is an abstract class whose functionality lies mainly in App.
// App is the clean template and interface for the programmer while this
// Does "behind the scenes" work
#pragma once
#include <SDL.h>
#include "Screen.h"
#include "Scene.h"
#include "Rasterizer.h"
#include "SoftwareDevice.h"

const UINT INPUT_SIZE = 122;

class Engine
{
private:
	// The index of each element in the array represents the ascii value of the key pressed
	// This way I can garuntee input is always ordered and it doesn't require a search   
	bool mCurrentKeyState[INPUT_SIZE];
	bool mPreviousKeyState[INPUT_SIZE];
	SDL_Window* mWindow;
	SDL_Renderer* mRenderer;
	SDL_Texture* mTexture;
	bool mRunning;

private:
	// Posts the key
	void KeyIsDown(char key) { mCurrentKeyState[key] = true; }
	void KeyIsUp(char key) { mCurrentKeyState[key] = false; }


protected:
	SoftwareDevice sDevice;
	float fTime;
	UINT prevTime;
	UINT currTime;

protected:
	// Gets the key
	bool IsCurrentKeyDown(char key) { return mCurrentKeyState[key]; }
	bool IsPreviousKeyDown(char key) { return mPreviousKeyState[key]; }


public:
	bool IsRunning() const { return mRunning; }
	void Quit() { mRunning = false; }
	float GetFrameTime() { return fTime; }
	SDL_Window* GetSDLWindow() { return mWindow; }

public:
	Engine();
	~Engine();

	void Tick();

	void EngineInitialize();
	virtual void Initialize();

	void EngineLoad();
	virtual void Load();

	void EngineUpdate();
	virtual void Update();

	void Input(SDL_Event e);
	inline void PushKeyState();

	void EngineUnLoad();
	virtual void UnLoad();

	void EngineDraw();
	virtual void Draw();
};