[游戏开发]从零开始的openGL--cs游戏（3）Time类

Time类

#ifndef Time_H
#define Time_H
#include "Window.h"

class Time
{
private:
	static float _deltaTime;
	static float _startTime;
	static float _curTime;
	friend void Window::SetDeltaTime(float time);
	friend void Window::SetCurTime(float time);
	friend void Window::SetStartTime(float time);
public:
	static float GetDeltaTime();
	static float GetCurTime();
	static float GetStartTimee();
};
#endif
-------------------------
#include "Time.h"

float Time::_deltaTime = 0.0f;
float Time::_curTime = 0.0f;
float Time::_startTime = 0.0f;
float Time::GetDeltaTime()
{
	return _deltaTime;
}

float Time::GetCurTime()
{
	return _curTime;
}

float Time::GetStartTimee()
{
	return _startTime;
}

在Windows中修改

void Window::Mainloop()
{
	float starTime = glfwGetTime();
	float currentFrame, lastFrame = starTime;
	SetStartTime(starTime);

	while (!glfwWindowShouldClose(Window::window_ptr))
	{
		currentFrame = glfwGetTime();
		SetCurTime(currentFrame);
		float deltaTime = currentFrame - lastFrame;
		lastFrame = currentFrame;
		SetDeltaTime(deltaTime);

		//for each frame 
		Input();

		glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
		glClearColor(0.05f, 0.05f, 0.05f, 1.0f);

		// all drawing goes here ..


		glfwSwapBuffers(window_ptr);
		glfwPollEvents();
	}
}

void Window::SetDeltaTime(float time)
{
	Time::_deltaTime = time;
}

void Window::SetStartTime(float time)
{
	Time::_startTime = time;
}

void Window::SetCurTime(float time)
{
	Time::_curTime = time;
}