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 // Copyright (c) 2018 OPEN CASCADE SAS
 //
 // This file is part of Open CASCADE Technology software library.
 //
 // This library is free software; you can redistribute it and/or modify it under
 // the terms of the GNU Lesser General Public License version 2.1 as published
 // by the Free Software Foundation, with special exception defined in the file
 // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT
 // distribution for complete text of the license and disclaimer of any warranty.
 //
 // Alternatively, this file may be used under the terms of Open CASCADE
 // commercial license or contractual agreement.
 
 #ifndef _Graphic3d_FrameStatsData_HeaderFile
 #define _Graphic3d_FrameStatsData_HeaderFile
 
 #include <NCollection_Array1.hxx>
 #include <Graphic3d_FrameStatsCounter.hxx>
 #include <Graphic3d_FrameStatsTimer.hxx>
 #include <OSD_Timer.hxx>
 
 #include <vector>
 
 //! Data frame definition.
 class Graphic3d_FrameStatsData
 {
 public:
   DEFINE_STANDARD_ALLOC
 
   //! Returns FPS (frames per seconds, elapsed time).
   //! This number indicates an actual frame rate averaged for several frames within UpdateInterval() duration,
   //! basing on a real elapsed time between updates.
   Standard_Real FrameRate() const { return myFps; }
 
   //! Returns CPU FPS (frames per seconds, CPU time).
   //! This number indicates a PREDICTED frame rate,
   //! basing on CPU elapsed time between updates and NOT real elapsed time (which might include periods of CPU inactivity).
   //! Number is expected to be greater then actual frame rate returned by FrameRate().
   //! Values significantly greater actual frame rate indicate that rendering is limited by GPU performance (CPU is stalled in-between),
   //! while values around actual frame rate indicate rendering being limited by CPU performance (GPU is stalled in-between).
   Standard_Real FrameRateCpu() const { return myFpsCpu; }
 
   //! Returns FPS for immediate redraws.
   Standard_Real ImmediateFrameRate() const { return myFpsImmediate; }
 
   //! Returns CPU FPS for immediate redraws.
   Standard_Real ImmediateFrameRateCpu() const { return myFpsCpuImmediate; }
 
   //! Get counter value.
   Standard_Size CounterValue (Graphic3d_FrameStatsCounter theIndex) const { return myCounters[theIndex]; }
 
   //! Get counter value.
   Standard_Size operator[] (Graphic3d_FrameStatsCounter theIndex) const { return CounterValue (theIndex); }
 
   //! Get timer value.
   Standard_Real TimerValue (Graphic3d_FrameStatsTimer theIndex) const { return myTimers[theIndex]; }
 
   //! Get timer value.
   Standard_Real operator[] (Graphic3d_FrameStatsTimer theIndex) const { return TimerValue (theIndex); }
 
   //! Empty constructor.
   Standard_EXPORT Graphic3d_FrameStatsData();
 
   //! Copy constructor.
   Standard_EXPORT Graphic3d_FrameStatsData(const Graphic3d_FrameStatsData& theOther);
 
   //! Move constructor.
   Standard_EXPORT Graphic3d_FrameStatsData(Graphic3d_FrameStatsData&& theOther) noexcept;
 
   //! Assignment operator.
   Standard_EXPORT Graphic3d_FrameStatsData& operator= (const Graphic3d_FrameStatsData& theOther);
 
   //! Assignment with move operator.
   Standard_EXPORT Graphic3d_FrameStatsData& operator= (Graphic3d_FrameStatsData&& theOther) noexcept;
 
   //! Reset data.
   Standard_EXPORT void Reset();
 
   //! Fill with maximum values.
   Standard_EXPORT void FillMax (const Graphic3d_FrameStatsData& theOther);
 
 protected:
   std::vector<Standard_Size> myCounters;  //!< counters
   std::vector<Standard_Real> myTimers;    //!< timers
   std::vector<Standard_Real> myTimersMin; //!< minimal values of timers
   std::vector<Standard_Real> myTimersMax; //!< maximum values of timers
   Standard_Real              myFps;       //!< FPS     meter (frames per seconds, elapsed time)
   Standard_Real              myFpsCpu;    //!< CPU FPS meter (frames per seconds, CPU time)
   Standard_Real              myFpsImmediate;    //!< FPS     meter for immediate redraws
   Standard_Real              myFpsCpuImmediate; //!< CPU FPS meter for immediate redraws
 };
 
 //! Temporary data frame definition.
 class Graphic3d_FrameStatsDataTmp : public Graphic3d_FrameStatsData
 {
 public:
   //! Empty constructor.
   Standard_EXPORT Graphic3d_FrameStatsDataTmp();
 
   //! Compute average data considering the amount of rendered frames.
   Standard_EXPORT void FlushTimers (Standard_Size theNbFrames, bool theIsFinal);
 
   //! Reset data.
   Standard_EXPORT void Reset();
 
   //! Assignment operator (skip copying irrelevant properties).
   void operator= (const Graphic3d_FrameStatsData& theOther) { Graphic3d_FrameStatsData::operator= (theOther); }
 
   //! Returns FPS (frames per seconds, elapsed time).
   Standard_Real& ChangeFrameRate() { return myFps; }
 
   //! Returns CPU FPS (frames per seconds, CPU time).
   Standard_Real& ChangeFrameRateCpu() { return myFpsCpu; }
 
   //! Returns FPS for immediate redraws.
   Standard_Real& ChangeImmediateFrameRate() { return myFpsImmediate; }
 
   //! Returns CPU FPS for immediate redraws.
   Standard_Real& ChangeImmediateFrameRateCpu() { return myFpsCpuImmediate; }
 
   //! Return a timer object for time measurements.
   OSD_Timer& ChangeTimer (Graphic3d_FrameStatsTimer theTimer) { return myOsdTimers[theTimer]; }
 
   //! Get counter value.
   Standard_Size& ChangeCounterValue (Graphic3d_FrameStatsCounter theIndex) { return myCounters[theIndex]; }
 
   //! Modify counter value.
   Standard_Size& operator[] (Graphic3d_FrameStatsCounter theIndex) { return ChangeCounterValue (theIndex); }
 
   //! Modify timer value.
   Standard_Real& ChangeTimerValue (Graphic3d_FrameStatsTimer theIndex) { return myTimers[theIndex]; }
 
   //! Modify timer value.
   Standard_Real& operator[] (Graphic3d_FrameStatsTimer theIndex) { return ChangeTimerValue (theIndex); }
 
 protected:
   std::vector<OSD_Timer>     myOsdTimers;  //!< precise timers for time measurements
   std::vector<Standard_Real> myTimersPrev; //!< previous timers values
 };
 
 #endif // _Graphic3d_FrameStatsData_HeaderFile

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