demotool/profiling.hh

#pragma once
#ifndef REAL_BUILD
# define REAL_BUILD
# include "externals.hh"
# include "utilities.hh"
# undef REAL_BUILD
#endif


struct T_ProfilerSamples
{
	float sum;
	uint32_t nSamples;
};


struct T_Profiler
{
	static constexpr uint32_t Samples = 4;
	static constexpr uint32_t History = 4;
	static constexpr uint32_t Invalid = 0xffffffff;
	static T_Profiler Profiler;

	void clear( );

	void startFrame( );
	void start( __rd__ std::string const& section );
	void end( __rd__ std::string const& section );
	void endFrame( );

	uint32_t sections( ) const noexcept
		{ return sections_.size( ); }

	std::string const& nameOf(
			__rd__ const uint32_t section ) const
		{ return sections_[ section ]; }

	float durationOf( __rd__ const uint32_t section ) const
		{ return secDurations_[ section ]; }
	float startOf( __rd__ const uint32_t section ) const
		{ return secStarts_[ section ]; }

    private:
	using T_SamplesList_ = std::vector< T_ProfilerSamples >;
	using T_Data_ = std::vector< T_SamplesList_ >;

	uint32_t find( __rd__ std::string const& section ) const;
	float computeDuration(
			__rd__ const uint32_t section ) const;

	uint32_t previous_;
	uint32_t current_;

	std::vector< std::string > sections_;
	std::vector< uint32_t > chain_;
	std::vector< uint32_t > parents_;
	T_Data_ samples_;
	std::vector< uint64_t > starts_;

	std::vector< float > secDurations_;
	std::vector< float > secStarts_;
};