69 lines
1.9 KiB
C
69 lines
1.9 KiB
C
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//=============================================================================//
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#ifndef CLOCKDRIFTMGR_H
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#define CLOCKDRIFTMGR_H
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#ifdef _WIN32
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#pragma once
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#endif
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class CClockDriftMgr
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{
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friend class CBaseClientState;
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public:
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CClockDriftMgr();
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// Is clock correction even enabled right now?
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static bool IsClockCorrectionEnabled();
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// Clear our state.
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void Clear();
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// This is called each time a server packet comes in. It is used to correlate
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// where the server is in time compared to us.
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void SetServerTick( int iServerTick );
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// Pass in the frametime you would use, and it will drift it towards the server clock.
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float AdjustFrameTime( float inputFrameTime );
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// Returns how many ticks ahead of the server the client is.
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float GetCurrentClockDifference() const;
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private:
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void ShowDebugInfo( float flAdjustment );
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// This scales the offsets so the average produced is equal to the
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// current average + flAmount. This way, as we add corrections,
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// we lower the average accordingly so we don't keep responding
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// as much as we need to after we'd adjusted it a couple times.
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void AdjustAverageDifferenceBy( float flAmountInSeconds );
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private:
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enum
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{
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// This controls how much it smoothes out the samples from the server.
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NUM_CLOCKDRIFT_SAMPLES=16
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};
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// This holds how many ticks the client is ahead each time we get a server tick.
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// We average these together to get our estimate of how far ahead we are.
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float m_ClockOffsets[NUM_CLOCKDRIFT_SAMPLES];
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int m_iCurClockOffset;
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int m_nServerTick; // Last-received tick from the server.
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int m_nClientTick; // The client's own tick counter (specifically, for interpolation during rendering).
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// The server may be on a slightly different tick and the client will drift towards it.
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};
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#endif // CLOCKDRIFTMGR_H
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