TnbPerformanceCount.h

[詳解]

#pragma once
#include "TnbDef.h"
 
 
 
//TNB Library
namespace TNB
{
 
 
 
class CPerformanceCount
{
public:
 
    CPerformanceCount(void)
    {
        LARGE_INTEGER li;
        m_isValid = !! ::QueryPerformanceFrequency(&m_freq);
        m_isValid &= !! ::QueryPerformanceCounter(&m_count);
        ::QueryPerformanceCounter(&li);
        m_apiCount = li.QuadPart - m_count.QuadPart;
        ASSERT0( m_isValid, "CPerformanceCount", "PerformanceCount が使用できません." );
        //TRACE2("PerformanceCount Resolution= %d(ns), %d\n", GetResolutionNanoCount(), static_cast<DWORD>(m_apiCount) );
        ::QueryPerformanceCounter(&m_count);
        m_count.QuadPart += m_apiCount;
    }
 
    bool IsValid(void) const
    {
        return m_isValid;
    }
 
    void Reset(void)
    {
        ::QueryPerformanceFrequency(&m_freq);
        ::QueryPerformanceCounter(&m_count);
        m_count.QuadPart += m_apiCount;
    }
 
    LONGLONG GetPassedCount(void) const
    {
        LARGE_INTEGER   c;
        ::QueryPerformanceCounter(&c);
        LONGLONG d = c.QuadPart - m_count.QuadPart;
        return (d * 1000 * 1000 / m_freq.QuadPart);
    }
 
    LONGLONG GetPassedNanoCount(void) const
    {
        LARGE_INTEGER   c;
        ::QueryPerformanceCounter(&c);
        LONGLONG d = c.QuadPart - m_count.QuadPart;
        return (d * 1000 * 1000 * 1000 / m_freq.QuadPart);
    }
 
    DWORD GetResolutionNanoCount(void) const
    {
        return static_cast<DWORD>(1000 * 1000 * 1000 / m_freq.QuadPart);
    }
 
    bool IsPassed(DWORD dwTime) const
    {
        return GetPassedCount() >= dwTime;
    }
 
    bool IsPassedAndReset(DWORD dwTime)
    {
        bool r = IsPassed(dwTime);
        if ( r ){ Reset(); }
        return r;
    }
 
    void OutputDebugPassedCount(void) const
    {
        TRACE1( " passed count = %.6f(ms)\n",  static_cast<double>(GetPassedNanoCount() / 1000000.0) );
    }
 
private:
    LARGE_INTEGER   m_count;        
    LARGE_INTEGER   m_freq;         
    LONGLONG        m_apiCount;     
    bool            m_isValid;      
};
 
 
 
};//TNB