Logging

一个完整的引擎自然需要一个日志系统来进行各种状态的显示，便于我们查看程序的运行状态和 debug，在这里主要使用的是 github 上面的开源项目 spdlog

• 添加 spdlog 根目录终端输入

  git submodule add https://github.com/gabime/spdlog Hazel/vendor/spdlog

  • 包含 spdlog 目录-在 Hazel 和 SandBox 属性页，所有配置，常规，附加包含目录 $(Solution)Hazel\vendor\spdlog\include;

• 创建 Log 类

//Log.h
#pragma once

#include <memory>
#include "Core.h"
#include "spdlog/spdlog.h"


namespace Hazel {
	class HAZEL_API Log
	{
	public:
		static void Init();

		inline static std::shared_ptr<spdlog::logger>& GetCoreLogger() { return s_CoreLogger; }
		inline static std::shared_ptr<spdlog::logger>& GetClientLogger() { return s_ClientLogger; }

	private:
		static std::shared_ptr<spdlog::logger> s_CoreLogger;		//log for engine
		static std::shared_ptr<spdlog::logger> s_ClientLogger;		//log for client
	};

}

// Log.cpp
#include "Log.h"

namespace Hazel {
	std::shared_ptr<spdlog::logger> Log::s_CoreLogger;    //这里没加Log:: 类声明导致LNK2001 报错！！
	std::shared_ptr<spdlog::logger> Log::s_ClientLogger;

	void Log::Init() {
    spdlog::set_pattern("%^[%T] %n: %v%$");  //time
		s_CoreLogger = spdlog::stdout_color_mt("HAZEL");
		s_CoreLogger->set_level(spdlog::level::trace);

		s_ClientLogger = spdlog::stdout_color_mt("APP");
		s_ClientLogger->set_level(spdlog::level::trace);
  }
}

//Core log macros
#define HZ_CORE_TRACE(...)		::Hazel::Log::GetCoreLogger()->trace(__VA_ARGS__)
#define HZ_CORE_WARN(...)		::Hazel::Log::GetCoreLogger()->warn(__VA_ARGS__)
#define HZ_CORE_INFO(...)		::Hazel::Log::GetCoreLogger()->info(__VA_ARGS__)
#define HZ_CORE_ERROR(...)		::Hazel::Log::GetCoreLogger()->error(__VA_ARGS__)
#define HZ_CORE_FATAL(...)		::Hazel::Log::GetCoreLogger()->fatal(__VA_ARGS__)

//Client log macros
#define HZ_TRACE(...)			::Hazel::Log::GetClientLogger()->trace(__VA_ARGS__)
#define HZ_WARN(...)			::Hazel::Log::GetClientLogger()->warn(__VA_ARGS__)
#define HZ_INFO(...)			::Hazel::Log::GetClientLogger()->info(__VA_ARGS__)
#define HZ_ERROR(...)			::Hazel::Log::GetClientLogger()->error(__VA_ARGS__)
#define HZ_FATAL(...)			::Hazel::Log::GetClientLogger()->fatal(__VA_ARGS__)

• main 函数中调用

int main(int argc, char** argv) 
{
	Hazel::Log::Init();
	HZ_CORE_WARN("Initialized Log");
	int a = 5;
	HZ_INFO("Hello! Var={0}", a);
	auto app = Hazel::CreateApplication();
	app->Run();
	delete app;
}

• 运行效果：