Initial checkin of Timer class.

library/PolyVoxCore/source/Impl/Timer.cpp

@@ -0,0 +1,92 @@
+/*******************************************************************************
+Copyright (c) 2005-20013 David Williams and Matthew Williams
+
+This software is provided 'as-is', without any express or implied
+warranty. In no event will the authors be held liable for any damages
+arising from the use of this software.
+
+Permission is granted to anyone to use this software for any purpose,
+including commercial applications, and to alter it and redistribute it
+freely, subject to the following restrictions:
+
+    1. The origin of this software must not be misrepresented; you must not
+    claim that you wrote the original software. If you use this software
+    in a product, an acknowledgment in the product documentation would be
+    appreciated but is not required.
+
+    2. Altered source versions must be plainly marked as such, and must not be
+    misrepresented as being the original software.
+
+    3. This notice may not be removed or altered from any source
+    distribution. 	
+*******************************************************************************/
+
+#include "PolyVoxCore/Impl/Timer.h"
+
+#include "PolyVoxCore/Impl/ErrorHandling.h"
+
+#include <iostream>
+
+namespace PolyVox
+{
+#if defined(_MSC_VER)
+	Timer::Timer(bool bAutoStart)
+		:m_fPCFreq(0.0)
+		,m_iStartTime(0)
+	{
+		if(bAutoStart)
+		{
+			start();
+		}
+	}
+
+	void Timer::start(void)
+	{
+		LARGE_INTEGER li;
+		if(!QueryPerformanceFrequency(&li))
+		{
+			logWarning() << "QueryPerformanceFrequency failed!";
+			m_fPCFreq = 1.0f;
+		}
+
+		m_fPCFreq = double(li.QuadPart)/1000.0;
+
+		QueryPerformanceCounter(&li);
+		m_iStartTime = li.QuadPart;
+	}
+
+	float Timer::elapsedTimeInSeconds(void)
+	{
+		return static_cast<float>(elapsedTimeInMilliSeconds()) / 1000.0f;
+	}
+
+	uint32_t Timer::elapsedTimeInMilliSeconds(void)
+	{
+		LARGE_INTEGER li;
+		QueryPerformanceCounter(&li);
+		return static_cast<uint32_t>(double(li.QuadPart-m_iStartTime)/m_fPCFreq);
+	}
+#else //_MSC_VER
+	Timer::Timer(bool bAutoStart)
+	{
+		if(bAutoStart)
+		{
+			start();
+		}
+	}
+
+	void Timer::start(void)
+	{
+	}
+
+	float Timer::elapsedTimeInSeconds(void)
+	{
+		return 0.0f
+	}
+
+	uint32_t Timer::elapsedTimeInMilliSeconds(void)
+	{
+		return 0;
+	}
+#endif //_MSC_VER
+}