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libs/Common/Timer.cpp

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+////////////////////////////////////////////////////////////////////
+// Timer.cpp
+//
+// Copyright 2007 cDc@seacave
+// Distributed under the Boost Software License, Version 1.0
+// (See http://www.boost.org/LICENSE_1_0.txt)
+
+#include "Common.h"
+#include "Timer.h"
+
+using namespace SEACAVE;
+
+
+// D E F I N E S ///////////////////////////////////////////////////
+
+
+// S T R U C T S ///////////////////////////////////////////////////
+
+/**
+ * Constructor
+ */
+Timer::Timer(uint8_t nHH, uint8_t nMM)
+{
+	m_fElapsedTime = 1.f;
+	m_fTimeScale = 1.f;
+	#ifdef FIX_FPS
+	m_fCurrentFramesTime = 0.f;
+	m_nCurrentFrames = 0;
+	m_nLastSecFrames = 0;
+	#endif // FIX_FPS
+
+	// set clock
+	m_fClock = 0.f;
+	if (nHH > 23)
+		nHH = 0;
+	if (nMM > 59)
+		nMM = 0;
+	m_nHH = nHH;
+	m_nMM = nMM;
+	m_nSS = 0;
+
+	m_nCrntTime = GetSysTime();
+} // constructor
+/*----------------------------------------------------------------*/
+
+
+Timer::~Timer()
+{
+}
+/*----------------------------------------------------------------*/
+
+
+/**
+ * Counts the actual time and adjusts clock.
+ */
+void Timer::Update()
+{
+	const SysType timeNow = GetSysTime();
+	m_fElapsedTime = SysTime2Time(timeNow - m_nCrntTime);
+	m_nCrntTime = timeNow;
+
+	#ifdef FIX_FPS
+	// compute FPS
+	++m_nCurrentFrames;
+	if ((m_fCurrentFramesTime += m_fElapsedTime) >= 1.f) {
+		m_nLastSecFrames = (uint32_t)((Type)m_nCurrentFrames/m_fCurrentFramesTime);
+		m_fCurrentFramesTime = 0.f;
+		m_nCurrentFrames = 0;
+	}
+	#endif // FIX_FPS
+
+	// adjust clock by seconds passed
+	m_fClock += (m_fElapsedTime * m_fTimeScale);
+	if (m_fClock >= 1.f) {
+		m_nSS++;
+		m_fClock = 0.f;
+	}
+	if (m_nSS >= 60) {
+		m_nMM++;
+		m_nSS = 0;
+	}
+	if (m_nMM >= 60) {
+		m_nHH++;
+		m_nMM = 0;
+	}
+	if (m_nHH >= 24)
+		m_nHH = 0;
+} // Update
+/*----------------------------------------------------------------*/
+
+
+/**
+ * Sets the clock to any given starting time.
+ */
+void Timer::SetClock(uint8_t nHH, uint8_t nMM)
+{
+	// set clock
+	if (nHH > 23)
+		nHH = 0;
+	if (nMM > 59)
+		nMM = 0;
+
+	m_nHH = nHH;
+	m_nMM = nMM;
+} // SetClock
+/*----------------------------------------------------------------*/
+
+
+/**
+ * Gives you a time string with hours, minutes and seconds as return
+ * and hours and/or minutes as reference parameters.
+ */
+LPTSTR Timer::GetClock(uint8_t* nHH, uint8_t* nMM, LPTSTR szChar) const
+{
+	if (nHH != NULL)
+		*nHH = m_nHH;
+	if (nMM != NULL)
+		*nMM = m_nMM;
+
+	if (szChar == NULL)
+		return NULL;
+
+	_sntprintf(szChar, 32, "%.2d:%.2d:%.2d", m_nHH, m_nMM, m_nSS);
+	return szChar;
+} // GetClock
+/*----------------------------------------------------------------*/
+
+
+#ifdef TIMER_OLDSUPPORT
+// Check performance counter
+bool HasPerfCounter()
+{
+	SysType nPerfCnt;
+	return QueryPerformanceFrequency((LARGE_INTEGER*)&nPerfCnt) == TRUE;
+}
+const bool Timer::ms_bPerfFlag = HasPerfCounter();
+/*----------------------------------------------------------------*/
+#endif
+
+
+// Get system time factor used to convert to milliseconds
+Timer::Type GetSysTimeFactor()
+{
+	#ifdef _MSC_VER
+	Timer::SysType nPerfCnt;
+	const BOOL bPerfFlag = QueryPerformanceFrequency((LARGE_INTEGER*)&nPerfCnt);
+	#ifdef TIMER_OLDSUPPORT
+	// either QueryPerformanceCounter or GetTickCount
+	return (bPerfFlag ? 1000.f / nPerfCnt : 1.f);
+	#else
+	ASSERT(bPerfFlag);
+	return 1000.f / nPerfCnt;
+	#endif
+	#else // _MSC_VER
+	return 0.001f;
+	#endif // _MSC_VER
+}
+const Timer::Type Timer::ms_fTimeFactor = GetSysTimeFactor();
+/*----------------------------------------------------------------*/
+
+Timer::Type Timer::GetTimeFactor()
+{
+	return ms_fTimeFactor;
+}
+/*----------------------------------------------------------------*/