339 lines
9.7 KiB
C++
339 lines
9.7 KiB
C++
//========= Copyright © 1996-2008, 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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//=============================================================================//
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#include "cbase.h"
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#include "querycache.h"
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#include "tier0/vprof.h"
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#include "tier1/utlintrusivelist.h"
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#include "datacache/imdlcache.h"
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#include "vstdlib/jobthread.h"
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// memdbgon must be the last include file in a .cpp file!!!
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#include "tier0/memdbgon.h"
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#define QUERYCACHE_SIZE 1024
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static QueryCacheEntry_t s_QCache[QUERYCACHE_SIZE];
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#define QUERYCACHE_HASH_SIZE ( QUERYCACHE_SIZE * 2 )
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// elements available for cache reuse
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static CUtlIntrusiveDList<QueryCacheEntry_t> s_VictimList;
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static CUtlIntrusiveDList<QueryCacheEntry_t> s_HashChains[QUERYCACHE_HASH_SIZE];
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static int s_nReplaceCtr = QUERYCACHE_SIZE - 1;
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static int s_nTimeStampCounter = 0 ;
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static int s_nNumCacheQueries = 0;
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static int s_nNumCacheMisses = 0;
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static int s_SuccessfulSpeculatives = 0;
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static int s_WastedSpeculativeUpdates = 0;
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void QueryCacheKey_t::ComputeHashIndex( void )
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{
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unsigned int ret = ( unsigned int ) m_Type;
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for( int i = 0 ; i < m_nNumValidPoints; i++ )
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{
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ret += ( unsigned int ) m_pEntities[i].ToInt();
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ret += ( unsigned int ) m_nOffsetMode;
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}
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ret += *( ( uint32 *) &m_flMinimumUpdateInterval );
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ret += m_nTraceMask;
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m_nHashIdx = ret % QUERYCACHE_HASH_SIZE;
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}
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ConVar sv_disable_querycache("sv_disable_querycache", "0", FCVAR_CHEAT | FCVAR_REPLICATED | FCVAR_DEVELOPMENTONLY, "debug - disable trace query cache" );
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static QueryCacheEntry_t *FindOrAllocateCacheEntry( QueryCacheKey_t const &entry )
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{
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QueryCacheEntry_t *pFound = NULL;
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// see if we find it
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for( QueryCacheEntry_t *pNode = s_HashChains[entry.m_nHashIdx].m_pHead; pNode; pNode = pNode->m_pNext )
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{
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if ( pNode->m_QueryParams.Matches( &entry ) )
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{
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pFound = pNode;
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break;
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}
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}
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if (! pFound )
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{
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pFound = s_VictimList.RemoveHead();
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if ( ! pFound )
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{
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// randomly replace one
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pFound = s_QCache + s_nReplaceCtr;
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s_nReplaceCtr--;
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if ( s_nReplaceCtr < 0 )
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s_nReplaceCtr = QUERYCACHE_SIZE - 1;
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if ( pFound->m_QueryParams.m_Type != EQUERY_INVALID )
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{
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s_HashChains[pFound->m_QueryParams.m_nHashIdx].RemoveNode( pFound );
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}
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}
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pFound->m_QueryParams = entry;
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s_HashChains[pFound->m_QueryParams.m_nHashIdx].AddToHead( pFound );
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pFound->m_bSpeculativelyDone = false;
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pFound->IssueQuery();
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}
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else
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{
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if ( sv_disable_querycache.GetInt() ||
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( gpGlobals->curtime - pFound->m_flLastUpdateTime >=
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pFound->m_QueryParams.m_flMinimumUpdateInterval ) )
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{
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pFound->m_bSpeculativelyDone = false;
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pFound->IssueQuery();
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}
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else
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{
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if ( pFound->m_bSpeculativelyDone )
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s_SuccessfulSpeculatives++;
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}
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}
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return pFound;
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}
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static QueryCacheEntry_t *FindOrAllocateCacheEntry( EQueryType_t nType,
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CBaseEntity *pEntity1, CBaseEntity *pEntity2,
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EEntityOffsetMode_t nMode1, EEntityOffsetMode_t nMode2,
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unsigned int nTraceMask )
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{
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QueryCacheKey_t entry;
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entry.m_Type = nType;
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entry.m_pEntities[0] = pEntity1;
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entry.m_pEntities[1] = pEntity2;
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entry.m_nOffsetMode[0] = nMode1;
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entry.m_nOffsetMode[1] = nMode2;
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entry.m_nTraceMask = nTraceMask;
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entry.m_nNumValidPoints = 2;
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entry.ComputeHashIndex();
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return FindOrAllocateCacheEntry( entry );
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}
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bool QueryCacheKey_t::Matches( QueryCacheKey_t const *pNode ) const
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{
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if (
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( pNode->m_Type != m_Type ) ||
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( pNode->m_nTraceMask != m_nTraceMask ) ||
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( pNode->m_pTraceFilterFunction != m_pTraceFilterFunction ) ||
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( pNode->m_nNumValidPoints != m_nNumValidPoints ) ||
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( pNode->m_flMinimumUpdateInterval != m_flMinimumUpdateInterval )
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)
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return false;
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for( int i = 0; i < m_nNumValidPoints; i++ )
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{
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if (
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( pNode->m_pEntities[i] != m_pEntities[i] ) ||
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( pNode->m_nOffsetMode[i] != m_nOffsetMode[i] )
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)
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return false;
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}
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return true;
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}
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static void CalculateOffsettedPosition( CBaseEntity *pEntity, EEntityOffsetMode_t nMode, Vector *pVecOut )
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{
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switch( nMode )
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{
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case EOFFSET_MODE_WORLDSPACE_CENTER:
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*pVecOut = pEntity->WorldSpaceCenter();
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break;
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case EOFFSET_MODE_EYEPOSITION:
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*pVecOut = pEntity->EyePosition();
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break;
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case EOFFSET_MODE_NONE:
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pVecOut->Init();
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break;
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}
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}
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struct QueryCacheUpdateRecord_t
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{
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int m_nStartHashChain;
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int m_nNumHashChainsToUpdate;
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CUtlIntrusiveDListWithTailPtr<QueryCacheEntry_t> m_KilledList;
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};
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void ProcessQueryCacheUpdate( QueryCacheUpdateRecord_t &workItem )
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{
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float flCurTime = gpGlobals->curtime;
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// run through all of the cache.
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for( int i = 0; i < workItem.m_nNumHashChainsToUpdate; i++ )
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{
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QueryCacheEntry_t *pNext;
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for( QueryCacheEntry_t *pEntry = s_HashChains[i + workItem.m_nStartHashChain].m_pHead ; pEntry; pEntry = pNext )
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{
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pNext = pEntry->m_pNext;
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if ( pEntry->m_bUsedSinceUpdated )
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{
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if ( flCurTime - pEntry->m_flLastUpdateTime >=
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pEntry->m_QueryParams.m_flMinimumUpdateInterval )
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{
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// don't bother updating if we have recently
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pEntry->IssueQuery();
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pEntry->m_bUsedSinceUpdated = false;
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pEntry->m_bSpeculativelyDone = true;
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}
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}
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else
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{
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if ( flCurTime - pEntry->m_flLastUpdateTime > pEntry->m_QueryParams.m_flMinimumUpdateInterval )
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{
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if ( pEntry->m_bSpeculativelyDone && ( !pEntry->m_bUsedSinceUpdated ) )
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{
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s_WastedSpeculativeUpdates++;
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}
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pEntry->m_QueryParams.m_Type = EQUERY_INVALID;
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s_HashChains[pEntry->m_QueryParams.m_nHashIdx].RemoveNode( pEntry );
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workItem.m_KilledList.AddToHead( pEntry );
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}
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}
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}
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}
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}
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#define N_WAYS_TO_SPLIT_CACHE_UPDATE 8
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static void PreUpdateQueryCache()
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{
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mdlcache->BeginCoarseLock();
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mdlcache->BeginLock();
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}
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static void PostUpdateQueryCache()
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{
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mdlcache->EndLock();
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mdlcache->EndCoarseLock();
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}
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void UpdateQueryCache( void )
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{
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// parallel process all hash chains
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QueryCacheUpdateRecord_t workList[N_WAYS_TO_SPLIT_CACHE_UPDATE];
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int nCurEntry = 0;
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for( int i =0 ; i < N_WAYS_TO_SPLIT_CACHE_UPDATE; i++ )
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{
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workList[i].m_nStartHashChain = nCurEntry;
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if ( i != N_WAYS_TO_SPLIT_CACHE_UPDATE -1 )
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workList[i].m_nNumHashChainsToUpdate = ARRAYSIZE( s_HashChains ) / N_WAYS_TO_SPLIT_CACHE_UPDATE;
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else
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workList[i].m_nNumHashChainsToUpdate = ARRAYSIZE( s_HashChains ) - nCurEntry;
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nCurEntry += ARRAYSIZE( s_HashChains ) / N_WAYS_TO_SPLIT_CACHE_UPDATE;
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}
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ParallelProcess( workList, N_WAYS_TO_SPLIT_CACHE_UPDATE, ProcessQueryCacheUpdate, PreUpdateQueryCache, PostUpdateQueryCache, ( sv_disable_querycache.GetBool() ) ? 0 : INT_MAX );
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// now, we need to take all of the obsolete cache entries each thread generated and add them to
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// the victim cache
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for( int i = 0 ; i < N_WAYS_TO_SPLIT_CACHE_UPDATE; i++ )
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{
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PrependDListWithTailToDList( workList[i].m_KilledList, s_VictimList );
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}
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}
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void InvalidateQueryCache( void )
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{
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s_VictimList.RemoveAll();
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for( int i = 0; i < ARRAYSIZE( s_HashChains); i++ )
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s_HashChains[i].RemoveAll();
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// now, invalidate all cache entries and add them to the victims
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for( int i = 0; i < ARRAYSIZE( s_QCache ); i++ )
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{
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s_QCache[i].m_QueryParams.m_Type = EQUERY_INVALID;
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s_VictimList.AddToHead( s_QCache + i );
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}
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}
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void QueryCacheEntry_t::IssueQuery( void )
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{
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for( int i = 0 ; i < m_QueryParams.m_nNumValidPoints; i++ )
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{
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CBaseEntity *pEntity = m_QueryParams.m_pEntities[i];
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if (! pEntity )
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{
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m_QueryParams.m_Type = EQUERY_INVALID;
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s_HashChains[m_QueryParams.m_nHashIdx].RemoveNode( this );
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s_VictimList.AddToHead( this );
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return;
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}
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CalculateOffsettedPosition( pEntity, m_QueryParams.m_nOffsetMode[i],
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&( m_QueryParams.m_Points[i] ) );
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}
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CTraceFilterSimple filter( m_QueryParams.m_pEntities[2],
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m_QueryParams.m_nCollisionGroup,
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m_QueryParams.m_pTraceFilterFunction );
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trace_t result;
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s_nNumCacheMisses++;
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UTIL_TraceLine( m_QueryParams.m_Points[0], m_QueryParams.m_Points[1],
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m_QueryParams.m_nTraceMask, &filter, &result );
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m_bResult = ! ( result.DidHit() );
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m_flLastUpdateTime = gpGlobals->curtime;
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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 )
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{
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QueryCacheKey_t entry;
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entry.m_Type = EQUERY_ENTITY_LOS_CHECK;
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entry.m_pEntities[0] = pSrcEntity;
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entry.m_pEntities[1] = pDestEntity;
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entry.m_pEntities[2] = pSkipEntity;
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entry.m_nOffsetMode[0] = nSrcOffsetMode;
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entry.m_nOffsetMode[1] = nDestOffsetMode;
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entry.m_nOffsetMode[2] = EOFFSET_MODE_NONE;
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entry.m_nTraceMask = nTraceMask;
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entry.m_nNumValidPoints = 3;
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entry.m_nCollisionGroup = nCollisionGroup;
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entry.m_pTraceFilterFunction = pTraceFilterCallback;
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entry.m_flMinimumUpdateInterval = flMinimumUpdateInterval;
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entry.ComputeHashIndex();
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s_nNumCacheQueries++;
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QueryCacheEntry_t *pNode = FindOrAllocateCacheEntry( entry );
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pNode->m_bUsedSinceUpdated = true;
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return pNode->m_bResult;
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}
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#if defined( CLIENT_DLL )
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CON_COMMAND_F( cl_querycache_stats, "Display status of the query cache (client only)", FCVAR_CHEAT )
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#else
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CON_COMMAND( sv_querycache_stats, "Display status of the query cache (client only)" )
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#endif
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{
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Warning( "%d queries, %d misses (%d free) suc spec = %d wasted spec=%d\n",
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s_nNumCacheQueries, s_nNumCacheMisses, s_VictimList.Count(),
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s_SuccessfulSpeculatives, s_WastedSpeculativeUpdates );
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}
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