69 lines
2.6 KiB
C
69 lines
2.6 KiB
C
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//========= Copyright <20> 1996-2005, Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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// $NoKeywords: $
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//=============================================================================//
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#ifndef CHANGEFRAMELIST_H
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#define CHANGEFRAMELIST_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include "mempool.h"
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#include "dt_common.h"
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// This class holds the last tick (from host_tickcount) that each property in
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// a datatable changed at.
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//
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// It provides fast access to a list of properties that changed within a certain frame range.
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//
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// These are created once per entity per frame. Since usually a very small percentage of an
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// entity's properties actually change each frame, this allows you to get a small set of
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// properties to delta for each client.
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class CChangeFrameList
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{
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public:
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//properties are bucketed into batches to keep the iteration through change frames fast. This
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//allows for a time stamp to be checked on a bucket, and thereby skip the entire bucket
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static const uint32 knBucketSize = 32;
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CChangeFrameList( int nProperties, int iCurTick );
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~CChangeFrameList();
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CChangeFrameList( const CChangeFrameList &rhs );
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// Call this to delete the object.
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void Release();
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// This just returns the value you passed into AllocChangeFrameList().
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int GetNumProps() const { return m_nNumProps; }
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int GetPropTick( int nProp ) const { return m_ChangeTicks[ nProp ]; }
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// Sets the change frames for the specified properties to iFrame.
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void SetChangeTick( const int* RESTRICT pProps, int nNumProps, const int iTick );
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void SetChangeTick( const int nProp, const int iTick ) { m_ChangeTicks[ nProp ] = iTick; m_ChangeTicks[ m_nNumProps + nProp / knBucketSize ] = iTick; }
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//given a bucket index, this will determine the lastest tick on that bucket
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const int GetNumBuckets() const { return m_ChangeTicks.Count() - m_nNumProps; }
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const int* GetBucketChangeTicks() const { return m_ChangeTicks.Base() + m_nNumProps; }
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const int* GetChangeTicks() const { return m_ChangeTicks.Base(); }
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// Given a tick and a property index, this will determine if it was changed after that time
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bool DidPropChangeAfterTick( int iTick, int nProp ) const { return m_ChangeTicks[ nProp ] > iTick; }
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CChangeFrameList* Copy(); // return a copy of itself
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private:
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// Change frames for each property. The buckets for the property set are appended onto the end.
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CUtlVector< int > m_ChangeTicks;
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int m_nNumProps;
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CChangeFrameList &operator=( const CChangeFrameList &rhs );
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DECLARE_FIXEDSIZE_ALLOCATOR_MT( CChangeFrameList );
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};
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#endif // CHANGEFRAMELIST_H
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