Init

kaplademo/source/kaplaDemo/Timing.cpp

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+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions
+// are met:
+//  * Redistributions of source code must retain the above copyright
+//    notice, this list of conditions and the following disclaimer.
+//  * Redistributions in binary form must reproduce the above copyright
+//    notice, this list of conditions and the following disclaimer in the
+//    documentation and/or other materials provided with the distribution.
+//  * Neither the name of NVIDIA CORPORATION nor the names of its
+//    contributors may be used to endorse or promote products derived
+//    from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS ``AS IS'' AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+// PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
+// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+// OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+//
+// Copyright (c) 2018 NVIDIA Corporation. All rights reserved.
+
+#include <stdio.h>
+#define NOMINMAX
+#include <windows.h>
+#include "Timing.h"
+
+
+unsigned long getTime()
+{
+	return timeGetTime();
+}
+
+
+float getCurrentTime()
+{
+	unsigned int currentTime = timeGetTime();
+	return (float)(currentTime)*0.001f;
+}
+
+
+float getElapsedTime()
+{
+	static LARGE_INTEGER previousTime;
+	static LARGE_INTEGER freq;
+	static bool init = false;
+	if(!init){
+		QueryPerformanceFrequency(&freq);
+		QueryPerformanceCounter(&previousTime);
+		init=true;
+	}
+	LARGE_INTEGER currentTime;
+	QueryPerformanceCounter(&currentTime);
+	unsigned long long elapsedTime = currentTime.QuadPart - previousTime.QuadPart;
+	previousTime = currentTime;
+	return (float)(elapsedTime)/(freq.QuadPart);
+}
+