98 lines
2.7 KiB
C++
98 lines
2.7 KiB
C++
// TimeManager.hxx -- simulation-wide time management
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//
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// Written by James Turner, started July 2010.
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//
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// Copyright (C) 2010 Curtis L. Olson - http://www.flightgear.org/~curt
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of the
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// License, or (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#ifndef FG_TIME_TIMEMANAGER_HXX
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#define FG_TIME_TIMEMANAGER_HXX
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#include <simgear/structure/subsystem_mgr.hxx>
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#include <simgear/props/props.hxx>
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#include <simgear/props/propertyObject.hxx>
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// forward decls
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class SGTime;
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class TimeManager : public SGSubsystem, public SGPropertyChangeListener
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{
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public:
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TimeManager();
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void computeTimeDeltas(double& simDt, double& realDt);
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virtual void init();
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virtual void reinit();
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virtual void postinit();
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virtual void shutdown();
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void update(double dt);
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// SGPropertyChangeListener overrides
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virtual void valueChanged(SGPropertyNode *);
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void setTimeOffset(const std::string& offset_type, long int offset);
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private:
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/**
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* Ensure a consistent update-rate using a combination of
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* sleep()-ing and busy-waiting.
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*/
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void throttleUpdateRate();
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/**
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* Compute frame (update) rate and write it to a property
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*/
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void computeFrameRate();
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void updateLocalTime();
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// set up a time offset (aka warp) if one is specified
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void initTimeOffset();
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bool _inited;
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SGTime* _impl;
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SGTimeStamp _lastStamp;
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bool _firstUpdate;
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double _dtRemainder;
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SGPropertyNode_ptr _maxDtPerFrame;
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SGPropertyNode_ptr _clockFreeze;
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SGPropertyNode_ptr _timeOverride;
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SGPropertyNode_ptr _warp;
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SGPropertyNode_ptr _warpDelta;
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bool _lastClockFreeze;
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bool _adjustWarpOnUnfreeze;
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SGPropertyNode_ptr _longitudeDeg;
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SGPropertyNode_ptr _latitudeDeg;
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// frame-rate / worst-case latency / update-rate counters
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SGPropertyNode_ptr _frameRate;
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SGPropertyNode_ptr _frameRateWorst;
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SGPropertyNode_ptr _frameLatency;
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time_t _lastFrameTime;
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double _frameLatencyMax;
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int _frameCount;
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SGPropObjBool _sceneryLoaded,
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_sceneryLoadOverride;
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SGPropObjInt _modelHz;
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SGPropObjDouble _timeDelta, _simTimeDelta;
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};
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#endif // of FG_TIME_TIMEMANAGER_HXX
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