Benchmark/PerformanceCounter.h

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+/*
+	This file is part of EqualizerAPO, a system-wide equalizer.
+	Copyright (C) 2012  Jonas Thedering
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License along
+	with this program; if not, write to the Free Software Foundation, Inc.,
+	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+*/
+
+#pragma once
+
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+
+class PrecisionTimer
+{
+	LARGE_INTEGER freq;
+	LARGE_INTEGER startCount;
+
+public:
+	PrecisionTimer()
+	{
+		QueryPerformanceFrequency(&freq);
+	}
+
+	void start()
+	{
+		QueryPerformanceCounter(&startCount);
+	}
+
+	double stop()
+	{
+		LARGE_INTEGER stopCount;
+		QueryPerformanceCounter(&stopCount);
+
+		return double(stopCount.QuadPart - startCount.QuadPart) / freq.QuadPart;
+	}
+};