source: code/trunk/src/external/bullet/LinearMath/btQuickprof.h @ 11213

/***************************************************************************************************
**
** Real-Time Hierarchical Profiling for Game Programming Gems 3
**
** by Greg Hjelstrom & Byon Garrabrant
**
***************************************************************************************************/

// Credits: The Clock class was inspired by the Timer classes in 
// Ogre (www.ogre3d.org).



#ifndef BT_QUICK_PROF_H
#define BT_QUICK_PROF_H

//To disable built-in profiling, please comment out next line
//#define BT_NO_PROFILE 1
#ifndef BT_NO_PROFILE
#include <stdio.h>//@todo remove this, backwards compatibility
#include "btScalar.h"
#include "btAlignedAllocator.h"
#include <new>





#define USE_BT_CLOCK 1

#ifdef USE_BT_CLOCK

///The btClock is a portable basic clock that measures accurate time in seconds, use for profiling.
class btClock
{
public:
        btClock();

        btClock(const btClock& other);
        btClock& operator=(const btClock& other);

        ~btClock();

        /// Resets the initial reference time.
        void reset();

        /// Returns the time in ms since the last call to reset or since 
        /// the btClock was created.
        unsigned long int getTimeMilliseconds();

        /// Returns the time in us since the last call to reset or since 
        /// the Clock was created.
        unsigned long int getTimeMicroseconds();
private:
        struct btClockData* m_data;
};

#endif //USE_BT_CLOCK




///A node in the Profile Hierarchy Tree
class   CProfileNode {

public:
        CProfileNode( const char * name, CProfileNode * parent );
        ~CProfileNode( void );

        CProfileNode * Get_Sub_Node( const char * name );

        CProfileNode * Get_Parent( void )               { return Parent; }
        CProfileNode * Get_Sibling( void )              { return Sibling; }
        CProfileNode * Get_Child( void )                        { return Child; }

        void                            CleanupMemory();
        void                            Reset( void );
        void                            Call( void );
        bool                            Return( void );

        const char *    Get_Name( void )                                { return Name; }
        int                             Get_Total_Calls( void )         { return TotalCalls; }
        float                           Get_Total_Time( void )          { return TotalTime; }

protected:

        const char *    Name;
        int                             TotalCalls;
        float                           TotalTime;
        unsigned long int                       StartTime;
        int                             RecursionCounter;

        CProfileNode *  Parent;
        CProfileNode *  Child;
        CProfileNode *  Sibling;
};

///An iterator to navigate through the tree
class CProfileIterator
{
public:
        // Access all the children of the current parent
        void                            First(void);
        void                            Next(void);
        bool                            Is_Done(void);
        bool                Is_Root(void) { return (CurrentParent->Get_Parent() == 0); }

        void                            Enter_Child( int index );               // Make the given child the new parent
        void                            Enter_Largest_Child( void );    // Make the largest child the new parent
        void                            Enter_Parent( void );                   // Make the current parent's parent the new parent

        // Access the current child
        const char *    Get_Current_Name( void )                        { return CurrentChild->Get_Name(); }
        int                             Get_Current_Total_Calls( void ) { return CurrentChild->Get_Total_Calls(); }
        float                           Get_Current_Total_Time( void )  { return CurrentChild->Get_Total_Time(); }

        // Access the current parent
        const char *    Get_Current_Parent_Name( void )                 { return CurrentParent->Get_Name(); }
        int                             Get_Current_Parent_Total_Calls( void )  { return CurrentParent->Get_Total_Calls(); }
        float                           Get_Current_Parent_Total_Time( void )   { return CurrentParent->Get_Total_Time(); }

protected:

        CProfileNode *  CurrentParent;
        CProfileNode *  CurrentChild;

        CProfileIterator( CProfileNode * start );
        friend  class           CProfileManager;
};


///The Manager for the Profile system
class   CProfileManager {
public:
        static  void                                            Start_Profile( const char * name );
        static  void                                            Stop_Profile( void );

        static  void                                            CleanupMemory(void)
        {
                Root.CleanupMemory();
        }

        static  void                                            Reset( void );
        static  void                                            Increment_Frame_Counter( void );
        static  int                                             Get_Frame_Count_Since_Reset( void )             { return FrameCounter; }
        static  float                                           Get_Time_Since_Reset( void );

        static  CProfileIterator *      Get_Iterator( void )    
        { 
                
                return new CProfileIterator( &Root ); 
        }
        static  void                                            Release_Iterator( CProfileIterator * iterator ) { delete ( iterator); }

        static void     dumpRecursive(CProfileIterator* profileIterator, int spacing);

        static void     dumpAll();

private:
        static  CProfileNode                    Root;
        static  CProfileNode *                  CurrentNode;
        static  int                                             FrameCounter;
        static  unsigned long int                                       ResetTime;
};


///ProfileSampleClass is a simple way to profile a function's scope
///Use the BT_PROFILE macro at the start of scope to time
class   CProfileSample {
public:
        CProfileSample( const char * name )
        { 
                CProfileManager::Start_Profile( name ); 
        }

        ~CProfileSample( void )                                 
        { 
                CProfileManager::Stop_Profile(); 
        }
};


#define BT_PROFILE( name )                      CProfileSample __profile( name )

#else

#define BT_PROFILE( name )

#endif //#ifndef BT_NO_PROFILE



#endif //BT_QUICK_PROF_H