mvProfiler.h

#pragma once

#include <chrono>
#include <string>
#include <map>
#include "mvTypes.h"

using FloatingPointMicroseconds = std::chrono::duration<double, std::micro>;

//-----------------------------------------------------------------------------
// Useful structs
//-----------------------------------------------------------------------------
struct mvProfileResult
{
	std::string Name;
	FloatingPointMicroseconds Start;
	std::chrono::microseconds ElapsedTime;
};

struct mvInstrumentationSession
{
	std::string Name;
};

//-----------------------------------------------------------------------------
// mvInstrumentor
//-----------------------------------------------------------------------------
class mvInstrumentor
{

public:

	mvInstrumentor() : m_CurrentSession(nullptr) {}

	// Call to begin recording profile data (must call end session at a later time)
	void BeginSession(const std::string& name);

	// Call to end recording profile data
	void EndSession();

	// Used to write data to the profiling file
	void WriteProfile(const mvProfileResult& result);

	const std::map<std::string, std::chrono::microseconds>& getResults() const { return m_results; }

	static mvInstrumentor& Get();

private:

	// Note: you must already own lock on m_Mutex before
	// calling InternalEndSession()
	void InternalEndSession();

private:

	mvInstrumentationSession* m_CurrentSession;
	std::map<std::string, std::chrono::microseconds> m_results;

};

//-----------------------------------------------------------------------------
// mvInstrumentationTimer
//-----------------------------------------------------------------------------
class mvInstrumentationTimer
{

public:

	mvInstrumentationTimer(const char* name);

	~mvInstrumentationTimer();

	void Stop();

private:

	const char*                                        m_Name;
	b8                                                 m_Stopped;
	std::chrono::time_point<std::chrono::steady_clock> m_StartTimepoint;

};

#define MV_PROFILE_BEGIN_SESSION(name) ::mvInstrumentor::Get().BeginSession(name)
#define MV_PROFILE_END_SESSION() ::mvInstrumentor::Get().EndSession()
#define MV_PROFILE_SCOPE(name) ::mvInstrumentationTimer timer##__LINE__(name);
#define MV_PROFILE_FUNCTION() MV_PROFILE_SCOPE(__func__)