59 lines
2.2 KiB
C++
59 lines
2.2 KiB
C++
//
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// Multimedia timer support
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//
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#include "DebugOut.h"
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#include "MMTimer.h"
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// コンストラクタ/デストラクタの為のインスタンス
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static CMMTimer MMTimer;
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BOOL CMMTimer::m_bInitialize = FALSE;
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BOOL CMMTimer::m_bHigh = FALSE;
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SQWORD CMMTimer::m_hpFrequency = 0;
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CMMTimer::CMMTimer()
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{
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// 1ms単位を保証する為だけに呼ぶ…なんちゅう仕様じゃ
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if( !m_bInitialize ) {
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if( ::timeBeginPeriod( 1 ) == TIMERR_NOERROR )
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m_bInitialize = TRUE;
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}
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// ハイパフォーマンスカウンタでの時間計測用
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if( ::QueryPerformanceFrequency( (LARGE_INTEGER*)&m_hpFrequency ) ) {
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DEBUGOUT( "CMMTimer:Use high performance counter.(QueryPerformanceCounter)\n" );
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m_bHigh = TRUE;
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}
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}
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CMMTimer::~CMMTimer()
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{
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if( m_bInitialize ) {
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::timeEndPeriod( 1 );
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m_bInitialize = FALSE;
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}
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}
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SQWORD CMMTimer::GetMMTimer()
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{
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if( m_bHigh ) {
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SQWORD freq;
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::QueryPerformanceCounter( (LARGE_INTEGER*)&freq );
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return freq;
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}
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return (SQWORD)::timeGetTime();
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}
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FLOAT CMMTimer::CalcTimeDifference( SQWORD t0, SQWORD t1 )
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{
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if( m_bHigh ) {
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return (FLOAT)(1000.0*(double)(t1-t0)/(double)m_hpFrequency);
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}
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return (FLOAT)(t1-t0)*1000.0f;
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}
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