E:/p4/sw/physx/PxShared/1.0/trunk/src/foundation/include/PsTime.h
Go to the documentation of this file.00001 // This code contains NVIDIA Confidential Information and is disclosed to you 00002 // under a form of NVIDIA software license agreement provided separately to you. 00003 // 00004 // Notice 00005 // NVIDIA Corporation and its licensors retain all intellectual property and 00006 // proprietary rights in and to this software and related documentation and 00007 // any modifications thereto. Any use, reproduction, disclosure, or 00008 // distribution of this software and related documentation without an express 00009 // license agreement from NVIDIA Corporation is strictly prohibited. 00010 // 00011 // ALL NVIDIA DESIGN SPECIFICATIONS, CODE ARE PROVIDED "AS IS.". NVIDIA MAKES 00012 // NO WARRANTIES, EXPRESSED, IMPLIED, STATUTORY, OR OTHERWISE WITH RESPECT TO 00013 // THE MATERIALS, AND EXPRESSLY DISCLAIMS ALL IMPLIED WARRANTIES OF NONINFRINGEMENT, 00014 // MERCHANTABILITY, AND FITNESS FOR A PARTICULAR PURPOSE. 00015 // 00016 // Information and code furnished is believed to be accurate and reliable. 00017 // However, NVIDIA Corporation assumes no responsibility for the consequences of use of such 00018 // information or for any infringement of patents or other rights of third parties that may 00019 // result from its use. No license is granted by implication or otherwise under any patent 00020 // or patent rights of NVIDIA Corporation. Details are subject to change without notice. 00021 // This code supersedes and replaces all information previously supplied. 00022 // NVIDIA Corporation products are not authorized for use as critical 00023 // components in life support devices or systems without express written approval of 00024 // NVIDIA Corporation. 00025 // 00026 // Copyright (c) 2008-2014 NVIDIA Corporation. All rights reserved. 00027 // Copyright (c) 2004-2008 AGEIA Technologies, Inc. All rights reserved. 00028 // Copyright (c) 2001-2004 NovodeX AG. All rights reserved. 00029 00030 #ifndef PSFOUNDATION_PSTIME_H 00031 #define PSFOUNDATION_PSTIME_H 00032 00033 #include "Ps.h" 00034 00035 #if PX_LINUX || PX_ANDROID 00036 #include <time.h> 00037 #endif 00038 00039 namespace physx 00040 { 00041 namespace shdfnd 00042 { 00043 00044 struct CounterFrequencyToTensOfNanos 00045 { 00046 uint64_t mNumerator; 00047 uint64_t mDenominator; 00048 CounterFrequencyToTensOfNanos(uint64_t inNum, uint64_t inDenom) : mNumerator(inNum), mDenominator(inDenom) 00049 { 00050 } 00051 00052 // quite slow. 00053 uint64_t toTensOfNanos(uint64_t inCounter) const 00054 { 00055 return (inCounter * mNumerator) / mDenominator; 00056 } 00057 }; 00058 00059 class PX_FOUNDATION_API Time 00060 { 00061 public: 00062 typedef double Second; 00063 static const uint64_t sNumTensOfNanoSecondsInASecond = 100000000; 00064 // This is supposedly guaranteed to not change after system boot 00065 // regardless of processors, speedstep, etc. 00066 static const CounterFrequencyToTensOfNanos& getBootCounterFrequency(); 00067 00068 static CounterFrequencyToTensOfNanos getCounterFrequency(); 00069 00070 static uint64_t getCurrentCounterValue(); 00071 00072 // SLOW!! 00073 // Thar be a 64 bit divide in thar! 00074 static uint64_t getCurrentTimeInTensOfNanoSeconds() 00075 { 00076 uint64_t ticks = getCurrentCounterValue(); 00077 return getBootCounterFrequency().toTensOfNanos(ticks); 00078 } 00079 00080 Time(); 00081 Second getElapsedSeconds(); 00082 Second peekElapsedSeconds(); 00083 Second getLastTime() const; 00084 00085 private: 00086 #if PX_LINUX || PX_ANDROID || PX_APPLE_FAMILY || PX_PS4 00087 Second mLastTime; 00088 #else 00089 int64_t mTickCount; 00090 #endif 00091 }; 00092 } // namespace shdfnd 00093 } // namespace physx 00094 00095 #endif // #ifndef PSFOUNDATION_PSTIME_H
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