SHADE_Y3/SHADE_Engine/src/FRC/SHFramerateController.h

/*********************************************************************
 * \file   SHFramerateController.h
 * \author Ryan Wang Nian Jing
 * \brief  Declaration for the framerate controller
 *				 Handles changing of scenes and manages loop (timestep, etc.)
 *
 * \copyright Copyright (c) 2022 DigiPen Institute of Technology. Reproduction
	 or disclosure of this file or its contents without the prior written
	 consent of DigiPen Institute of Technology is prohibited.
 *********************************************************************/

#ifndef SH_FRAMERATECONTROLLER_H
#define SH_FRAMERATECONTROLLER_H
#pragma once

#include <chrono>
#include "SH_API.h"

namespace SHADE
{
	class SH_API SHFrameRateController
	{
	private:
		//Varying delta time. The actual time it took for every frame
		static double rawDeltaTime;
		static std::chrono::steady_clock::time_point prevFrameTime;


	public:
		//Gets the raw delta time
		static inline double GetRawDeltaTime() noexcept
		{
			return rawDeltaTime;
		}

		//Updates the raw delta time accordingly
		static void UpdateFRC() noexcept;

	};

}



//TODO Legacy code. Delete soon
#if 0
#include "../Scene/SHScene.h"

namespace SHADE
{
	class SHFramerateController
	{
	private:
		//scene pointers
		static SHScene* previousScene;
		static SHScene* currentScene;
		static SHScene* nextScene;

		//Flags
		//Whether the flag has been raised for the game to be quit
		static bool toQuit;

		//Whether the flag has been raised for the current scene to restart
		static bool toRestart;

	public:
		//Fixed timestep value for physics. Default at 1/100th of a second.
		//Should be lower than the variable refresh rate
		static double fixedTimestep;

		//Scene Manager Loop
		//This loop is vital to the game because it runs for as long as the game
		//runs. Before entering, initialise vital systems for game. After exiting,
		//free these vital systems before finishing the main() function and
		//terminating the game
		//Parameter of firstScene is what scene the game should start with
		static void Run(SHScene* firstScene);

		//Set the flag to restart the current game scene
		static inline void RestartScene() { toRestart = true; }

		//Set the flag to halt running of the scene manager and quit the game
		static inline void QuitGame() { toQuit = true; }

		//Set the next scene to be excuted
		//This will tell the scene manager to
		//halt execution of the current scene and prepare
		//execution of the next
		static inline void SetNextScene(SHScene* const next) { nextScene = next; }



	};



}
#endif






#endif