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hammer/clock.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include <stdafx.h>
+
+static double beginTime;
+
+
+double I_FloatTime( void )
+{
+	static double freq = 0.0;
+	static __int64 firstCount;
+	__int64	curCount;
+
+	if (freq == 0.0)
+	{
+		__int64 perfFreq;
+		QueryPerformanceFrequency( (LARGE_INTEGER*)&perfFreq );
+		QueryPerformanceCounter( (LARGE_INTEGER*)&firstCount );
+		freq = 1.0 / (double)perfFreq;
+	}
+
+	QueryPerformanceCounter ( (LARGE_INTEGER*)&curCount );
+	curCount -= firstCount;
+	double time = (double)curCount * freq;
+	return time;	
+}
+
+
+void I_BeginTime( void )
+{
+	beginTime = I_FloatTime();
+}
+
+
+double I_EndTime( void )
+{
+	return ( I_FloatTime() - beginTime );
+}