100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
//========= Copyright 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 QUERYCACHE_H
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#define QUERYCACHE_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include "tier0/platform.h"
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#include "mathlib/vector.h"
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// this system provides several piece of functionality to ai or other systems which wish to do
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// traces and other trace-like queries.
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// a. By maintaining a set of incrementally updated trace results, it makes it simple to have ai
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// code use hyteresis on traces as an optimization method.
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// b. By updating the cache entries outside of the entity think functions, the update is done in a
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// fully multi-threaded fashion
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enum EQueryType_t
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{
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EQUERY_INVALID = 0, // an invalid or unused entry
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EQUERY_TRACELINE,
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EQUERY_ENTITY_LOS_CHECK,
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};
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enum EEntityOffsetMode_t
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{
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EOFFSET_MODE_WORLDSPACE_CENTER,
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EOFFSET_MODE_EYEPOSITION,
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EOFFSET_MODE_NONE, // nop
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};
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#define QCACHE_MAXPNTS 3 // maximum number of points/entities
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// involved in a query
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struct QueryCacheKey_t
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{
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EQueryType_t m_Type;
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int m_nNumValidPoints;
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Vector m_Points[QCACHE_MAXPNTS];
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EHANDLE m_pEntities[QCACHE_MAXPNTS];
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EEntityOffsetMode_t m_nOffsetMode[QCACHE_MAXPNTS];
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unsigned int m_nTraceMask;
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unsigned int m_nHashIdx;
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int m_nCollisionGroup;
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ShouldHitFunc_t m_pTraceFilterFunction;
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float m_flMinimumUpdateInterval;
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void ComputeHashIndex( void );
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bool Matches( QueryCacheKey_t const *pNode ) const ;
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};
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struct QueryCacheEntry_t
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{
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QueryCacheEntry_t *m_pNext;
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QueryCacheEntry_t *m_pPrev;
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QueryCacheKey_t m_QueryParams;
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float m_flLastUpdateTime;
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bool m_bUsedSinceUpdated; // was this cell referenced?
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bool m_bSpeculativelyDone;
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bool m_bResult; // for queries with a boolean result
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void IssueQuery( void );
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};
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bool IsLineOfSightBetweenTwoEntitiesClear( CBaseEntity *pSrcEntity,
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EEntityOffsetMode_t nSrcOffsetMode,
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CBaseEntity *pDestEntity,
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EEntityOffsetMode_t nDestOffsetMode,
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CBaseEntity *pSkipEntity,
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int nCollisionGroup,
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unsigned int nTraceMask,
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ShouldHitFunc_t pTraceFilterCallback,
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float flMinimumUpdateInterval = 0.2
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);
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// call during main loop for threaded update of the query cache
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void UpdateQueryCache( void );
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// call on level transition or other significant step-functions
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void InvalidateQueryCache( void );
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#endif // querycache_h
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