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// the main entry point for the application is this function
void DarkGDK()
{
	/**************************************************************************
	*  PreCondition: Program Load
	* PostCondition: The Program will exit and resources will be freed
	*   Description: This is the main entry function that encompasses the
	*                game loop and any work that need be done outside of it.
	*     Algorithm: Set up the initial screen and variables
	*                Enter Game Loop
	*                During game loop, check input and update the screen
	*                Exit the program
	**************************************************************************/

	//Seed the random number generator
	dbRandomize(dbTimer());

	//Set up the initial screen
	SetUpMainMenu();	
	
	// our main loop
	while(LoopGDK())
	{		
		//Check input
		CheckInput();

		//Update the terrain
		if(Position == Engine && Scenario != Space)
			dbUpdateTerrain();

		//Take care of non-player events
		if(Position == Engine)
			AutomatedEvents();
		
		// update the screen
		dbSync();
	}
	// return back to windows
	return;
}

void EngineInput()
{
	/**************************************************************************
	*  PreCondition: The game scenario has been loaded correctly
	* PostCondition: The appropriate camera action will be applied
	*   Description: This functions handles the input for the game engine
	*     Algorithm: If "Left Arrow" is pressed, Strafe Left
	*                If "Right Arrow" is pressed, Strafe Right
	*                If "Up Arrow" is pressed, move forward
	*                If "Down Arrow" is pressed, move backwards
	*                Establish where the mouse moved to
	*                Rotate the camera based on the mouse movement
	**************************************************************************/
//If the Escape Key was pressed
	if(dbEscapeKey())
	{
		int count = 1;

		//Clean up and return to the title screen
		dbCLS();

		//Delete the terrain, skybox, and players
		for(count = 1; count < 5; count++)
		{
			if(dbObjectExist(count))
				dbDeleteObject(count);
		}

		//Delete the in-game objects
		while(dbObjectExist(count))
		{
			dbDeleteObject(count);
			count++;
		}

		count = 1;

		//Delete the sound effects
		while(dbSoundExist(count))
		{
			dbDeleteSound(count);
		}		

		//Display the title screen
		LoadTitleScreen();
		dbEnableEscapeKey();
		dbSync();
		return;
	}
}

void LoadTitleScreen()
{
	/**************************************************************************
	*  PreCondition: The program is loading or has come from any of the menus
	* PostCondition: The title screen will be displayed
	*   Description: This function draws the Title Screen
	*     Algorithm: If the Options screen occupies the bitmap slot, delete it
	*                Clear the Screen
	*                Load the Title Screen base bitmap
	*                Copy the bitmap to the screen
	*                Free up the memory used by the bitmap
	*                Set the program position to the title screen
	*                Give the program focus back to the screen
	**************************************************************************/

	//If we came from the Options Screen, free up memory
	if(dbBitmapExist(1))
		dbDeleteBitmap(1);

	//If we came from the game engine, change the music
	if (Position == Engine)
	{
		dbStopMusic(1);
		dbDeleteMusic(1);
		dbLoadMusic(".\\Music\\16 At Dawn.mp3",1);
		dbLoopMusic(1);
	}

	//Clear the Screen
	dbCLS();

	//Load the Title Screen then free up resources
	dbLoadBitmap(".\\Images\\TitleScreen640x480.bmp",1);
	dbCopyBitmap(1,0);
	dbDeleteBitmap(1);

	//Keep track of where we are in the program
	Position = Main;
	dbSetCurrentBitmap(0);
	return;
}