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-/************************************************************************************
-
-PublicHeader: OVR
-Filename : OVR_Timer.h
-Content : Provides static functions for precise timing
-Created : September 19, 2012
-Notes :
-
-Copyright : Copyright 2014 Oculus VR, LLC All Rights reserved.
-
-Licensed under the Oculus VR Rift SDK License Version 3.2 (the "License");
-you may not use the Oculus VR Rift SDK except in compliance with the License,
-which is provided at the time of installation or download, or which
-otherwise accompanies this software in either electronic or hard copy form.
-
-You may obtain a copy of the License at
-
-http://www.oculusvr.com/licenses/LICENSE-3.2
-
-Unless required by applicable law or agreed to in writing, the Oculus VR SDK
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-
-************************************************************************************/
-
-#ifndef OVR_Timer_h
-#define OVR_Timer_h
-
-#include "OVR_Types.h"
-
-namespace OVR {
-
-//-----------------------------------------------------------------------------------
-// ***** Timer
-
-// Timer class defines a family of static functions used for application
-// timing and profiling.
-
-class Timer
-{
-public:
- enum {
- MsPerSecond = 1000, // Milliseconds in one second.
- MksPerSecond = 1000 * 1000, // Microseconds in one second.
- NanosPerSecond = 1000 * 1000 * 1000, // Nanoseconds in one second.
- };
-
- // ***** Timing APIs for Application
-
- // These APIs should be used to guide animation and other program functions
- // that require precision.
-
- // Returns global high-resolution application timer in seconds.
- static double OVR_STDCALL GetSeconds();
-
- // Returns time in Nanoseconds, using highest possible system resolution.
- static uint64_t OVR_STDCALL GetTicksNanos();
-
- // Kept for compatibility.
- // Returns ticks in milliseconds, as a 32-bit number. May wrap around every 49.2 days.
- // Use either time difference of two values of GetTicks to avoid wrap-around.
- static uint32_t OVR_STDCALL GetTicksMs()
- { return uint32_t(GetTicksNanos() / 1000000); }
-
- // for recorded data playback
- static void SetFakeSeconds(double fakeSeconds, bool enable = true)
- {
- FakeSeconds = fakeSeconds;
- useFakeSeconds = enable;
- }
-
-private:
- friend class System;
- // System called during program startup/shutdown.
- static void initializeTimerSystem();
- static void shutdownTimerSystem();
-
- // for recorded data playback
- static double FakeSeconds;
- static bool useFakeSeconds;
-
- #if defined(OVR_OS_ANDROID)
- // Android-specific data
- #elif defined (OVR_OS_MS)
- // Microsoft-specific data
- #elif defined(OVR_OS_MAC)
- static double TimeConvertFactorNanos; // Conversion factor for GetTicksNanos
- static double TimeConvertFactorSeconds; // Conversion factor for GetSeconds.
- #else
- static bool MonotonicClockAvailable; // True if clock_gettime supports CLOCK_MONOTONIC
- #endif
-};
-
-
-} // OVR::Timer
-
-#endif