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89 lines
2.7 KiB
C++
89 lines
2.7 KiB
C++
/************************************************************************************
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PublicHeader: OVR
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Filename : OVR_Timer.h
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Content : Provides static functions for precise timing
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Created : September 19, 2012
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Notes :
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Copyright : Copyright 2014 Oculus VR, Inc. All Rights reserved.
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Licensed under the Oculus VR Rift SDK License Version 3.1 (the "License");
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you may not use the Oculus VR Rift SDK except in compliance with the License,
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which is provided at the time of installation or download, or which
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otherwise accompanies this software in either electronic or hard copy form.
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You may obtain a copy of the License at
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http://www.oculusvr.com/licenses/LICENSE-3.1
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Unless required by applicable law or agreed to in writing, the Oculus VR SDK
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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************************************************************************************/
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#ifndef OVR_Timer_h
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#define OVR_Timer_h
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#include "OVR_Types.h"
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namespace OVR {
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//-----------------------------------------------------------------------------------
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// ***** Timer
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// Timer class defines a family of static functions used for application
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// timing and profiling.
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class Timer
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{
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public:
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enum {
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MsPerSecond = 1000, // Milliseconds in one second.
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NanosPerSecond = MsPerSecond * 1000 * 1000,
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MksPerSecond = MsPerSecond * 1000
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};
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// ***** Timing APIs for Application
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// These APIs should be used to guide animation and other program functions
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// that require precision.
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// Returns global high-resolution application timer in seconds.
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static double OVR_STDCALL GetSeconds();
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// Returns time in Nanoseconds, using highest possible system resolution.
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static UInt64 OVR_STDCALL GetTicksNanos();
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// Kept for compatibility.
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// Returns ticks in milliseconds, as a 32-bit number. May wrap around every 49.2 days.
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// Use either time difference of two values of GetTicks to avoid wrap-around.
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static UInt32 OVR_STDCALL GetTicksMs()
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{ return UInt32(GetTicksNanos() / 1000000); }
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// for recorded data playback
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static void SetFakeSeconds(double fakeSeconds)
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{
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FakeSeconds = fakeSeconds;
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useFakeSeconds = true;
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}
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private:
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friend class System;
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// System called during program startup/shutdown.
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static void initializeTimerSystem();
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static void shutdownTimerSystem();
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// for recorded data playback
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static double FakeSeconds;
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static bool useFakeSeconds;
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};
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} // OVR::Timer
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#endif
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