154 lines
4.4 KiB
C#
154 lines
4.4 KiB
C#
/*
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* Copyright (c) 2007-2009 SlimDX Group
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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using System;
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using System.Diagnostics;
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namespace SampleFramework
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{
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class GameClock
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{
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long baseRealTime;
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long lastRealTime;
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bool lastRealTimeValid;
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int suspendCount;
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long suspendStartTime;
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long timeLostToSuspension;
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TimeSpan currentTimeBase;
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TimeSpan currentTimeOffset;
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public TimeSpan CurrentTime
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{
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get { return currentTimeBase + currentTimeOffset; }
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}
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public TimeSpan ElapsedTime
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{
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get;
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private set;
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}
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public TimeSpan ElapsedAdjustedTime
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{
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get;
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private set;
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}
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public static long Frequency
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{
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get { return Stopwatch.Frequency; }
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}
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public GameClock()
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{
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Reset();
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}
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public void Reset()
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{
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currentTimeBase = TimeSpan.Zero;
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currentTimeOffset = TimeSpan.Zero;
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baseRealTime = Stopwatch.GetTimestamp();
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lastRealTimeValid = false;
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}
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public void Suspend()
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{
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suspendCount++;
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if (suspendCount == 1)
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suspendStartTime = Stopwatch.GetTimestamp();
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}
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/// <summary>
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/// Resumes a previously suspended clock.
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/// </summary>
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public void Resume()
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{
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suspendCount--;
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if (suspendCount <= 0)
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{
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timeLostToSuspension += Stopwatch.GetTimestamp() - suspendStartTime;
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suspendStartTime = 0;
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}
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}
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public void Step()
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{
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long counter = Stopwatch.GetTimestamp();
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if (!lastRealTimeValid)
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{
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lastRealTime = counter;
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lastRealTimeValid = true;
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}
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try
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{
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currentTimeOffset = CounterToTimeSpan(counter - baseRealTime);
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}
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catch (OverflowException)
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{
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// update the base value and try again to adjust for overflow
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currentTimeBase += currentTimeOffset;
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baseRealTime = lastRealTime;
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try
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{
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// get the current offset
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currentTimeOffset = CounterToTimeSpan(counter - baseRealTime);
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}
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catch (OverflowException)
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{
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// account for overflow
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baseRealTime = counter;
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currentTimeOffset = TimeSpan.Zero;
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}
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}
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try
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{
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ElapsedTime = CounterToTimeSpan(counter - lastRealTime);
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}
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catch (OverflowException)
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{
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ElapsedTime = TimeSpan.Zero;
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}
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try
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{
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ElapsedAdjustedTime = CounterToTimeSpan(counter - (lastRealTime + timeLostToSuspension));
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timeLostToSuspension = 0;
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}
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catch (OverflowException)
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{
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ElapsedAdjustedTime = TimeSpan.Zero;
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}
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lastRealTime = counter;
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}
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static TimeSpan CounterToTimeSpan(long delta)
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{
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return TimeSpan.FromTicks((delta * 10000000) / Frequency);
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}
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}
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}
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