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# sdk/common/NvBlastTime.h

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    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) 2016-2020 NVIDIA Corporation. All rights reserved.
    00027
    00028
    00029 #ifndef NVBLASTTIME_H
    00030 #define NVBLASTTIME_H
    00031
    00032 #include "NvBlastTypes.h"
    00033
    00034
    00035 namespace Nv
    00036 {
    00037 namespace Blast
    00038 {
    00039
    00040 class Time
    00041 {
    00042 public:
    00043     Time() : m_lastTickCount(getTimeTicks()) {}
    00044
    00045     int64_t         getElapsedTicks()
    00046     {
    00047         const int64_t lastTickCount = m_lastTickCount;
    00048         m_lastTickCount = getTimeTicks();
    00049         return m_lastTickCount - lastTickCount;
    00050     }
    00051
    00052     int64_t         peekElapsedTicks() const
    00053     {
    00054         return getTimeTicks() - m_lastTickCount;
    00055     }
    00056
    00057     int64_t         getLastTickCount() const
    00058     {
    00059         return m_lastTickCount;
    00060     }
    00061
    00062     static double   seconds(int64_t ticks)
    00063     {
    00064         return s_secondsPerTick * ticks;
    00065     }
    00066
    00067 private:
    00068     int64_t         getTimeTicks() const;
    00069     static double   getTickDuration();
    00070
    00071     int64_t             m_lastTickCount;
    00072     static const double s_secondsPerTick;
    00073 };
    00074
    00075 } // namespace Blast
    00076 } // namespace Nv
    00077
    00078
    00080
    00081 #if NV_MICROSOFT_FAMILY
    00082
    00083 #include "NvBlastIncludeWindows.h"
    00084
    00085 NV_INLINE int64_t Nv::Blast::Time::getTimeTicks() const
    00086 {
    00087     LARGE_INTEGER a;
    00088     QueryPerformanceCounter(&a);
    00089     return a.QuadPart;
    00090 }
    00091
    00092 NV_INLINE double Nv::Blast::Time::getTickDuration()
    00093 {
    00094     LARGE_INTEGER a;
    00095     QueryPerformanceFrequency(&a);
    00096     return 1.0 / (double)a.QuadPart;
    00097 }
    00098
    00099 #elif NV_UNIX_FAMILY
    00100
    00101 #include <time.h>
    00102
    00103 NV_INLINE int64_t Nv::Blast::Time::getTimeTicks() const
    00104 {
    00105     struct timespec mCurrTimeInt;
    00106     clock_gettime(CLOCK_REALTIME, &mCurrTimeInt);
    00107     return (static_cast<int64_t>(mCurrTimeInt.tv_sec) * 1000000000) + (static_cast<int64_t>(mCurrTimeInt.tv_nsec));
    00108 }
    00109
    00110 NV_INLINE double Nv::Blast::Time::getTickDuration()
    00111 {
    00112     return 1.e-9;
    00113 }
    00114
    00115 #elif NV_PS4
    00116
    00117 #include "ps4/NvBlastTimePS4.h"
    00118
    00119 #endif
    00120
    00121 #endif // #ifndef NVBLASTTIME_H

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