From 39ed87570bdb2f86969d4be821c94b722dc71179 Mon Sep 17 00:00:00 2001
From: Joe Ludwig <joe@valvesoftware.com>
Date: Wed, 26 Jun 2013 15:22:04 -0700
Subject: First version of the SOurce SDK 2013

---
 mp/src/game/shared/querycache.h | 99 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 99 insertions(+)
 create mode 100644 mp/src/game/shared/querycache.h

(limited to 'mp/src/game/shared/querycache.h')

diff --git a/mp/src/game/shared/querycache.h b/mp/src/game/shared/querycache.h
new file mode 100644
index 00000000..73c71944
--- /dev/null
+++ b/mp/src/game/shared/querycache.h
@@ -0,0 +1,99 @@
+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+#ifndef QUERYCACHE_H
+#define QUERYCACHE_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "tier0/platform.h"
+#include "mathlib/vector.h"
+
+// this system provides several piece of functionality to ai or other systems which wish to do
+// traces and other trace-like queries. 
+
+// a. By maintaining a set of incrementally updated trace results, it makes it simple to have ai
+// code use hyteresis on traces as an optimization method.
+
+// b. By updating the cache entries outside of the entity think functions, the update is done in a
+// fully multi-threaded fashion
+
+
+enum EQueryType_t
+{
+	EQUERY_INVALID = 0,									// an invalid or unused entry
+	EQUERY_TRACELINE,
+	EQUERY_ENTITY_LOS_CHECK,
+
+};
+
+enum EEntityOffsetMode_t
+{
+	EOFFSET_MODE_WORLDSPACE_CENTER,
+	EOFFSET_MODE_EYEPOSITION,
+	EOFFSET_MODE_NONE,										// nop
+};
+
+
+#define QCACHE_MAXPNTS 3									// maximum number of points/entities
+															// involved in a query
+
+struct QueryCacheKey_t
+{
+	EQueryType_t m_Type;
+	int m_nNumValidPoints;
+	Vector m_Points[QCACHE_MAXPNTS];
+	EHANDLE m_pEntities[QCACHE_MAXPNTS];
+	EEntityOffsetMode_t m_nOffsetMode[QCACHE_MAXPNTS];
+	unsigned int m_nTraceMask;
+	unsigned int m_nHashIdx;
+	int m_nCollisionGroup;
+	ShouldHitFunc_t m_pTraceFilterFunction;
+
+	float m_flMinimumUpdateInterval;
+
+	void ComputeHashIndex( void );
+
+	bool Matches( QueryCacheKey_t const *pNode ) const ;
+};
+
+struct QueryCacheEntry_t
+{
+	QueryCacheEntry_t *m_pNext;
+	QueryCacheEntry_t *m_pPrev;
+	QueryCacheKey_t m_QueryParams;
+	float m_flLastUpdateTime;
+	bool m_bUsedSinceUpdated;								// was this cell referenced?
+	bool m_bSpeculativelyDone;
+	bool m_bResult;											// for queries with a boolean result
+
+	void IssueQuery( void );
+
+};
+
+
+
+bool IsLineOfSightBetweenTwoEntitiesClear( CBaseEntity *pSrcEntity,
+										   EEntityOffsetMode_t nSrcOffsetMode,
+										   CBaseEntity *pDestEntity,
+										   EEntityOffsetMode_t nDestOffsetMode,
+										   CBaseEntity *pSkipEntity,
+										   int nCollisionGroup,
+										   unsigned int nTraceMask,
+										   ShouldHitFunc_t pTraceFilterCallback,
+										   float flMinimumUpdateInterval = 0.2
+	);
+
+
+
+// call during main loop for threaded update of the query cache
+void UpdateQueryCache( void );
+
+// call on level transition or other significant step-functions
+void InvalidateQueryCache( void );
+
+#endif // querycache_h
-- 
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