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hammer/culltreenode.cpp

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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//=============================================================================//
+
+#include "stdafx.h"
+#include "CullTreeNode.h"
+
+// memdbgon must be the last include file in a .cpp file!!!
+#include <tier0/memdbgon.h>
+
+
+// dvs: decide how this code should be organized
+bool BoxesIntersect(Vector const &mins1, Vector const &maxs1, Vector const &mins2, Vector const &maxs2);
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CCullTreeNode::CCullTreeNode(void)
+{
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+//-----------------------------------------------------------------------------
+CCullTreeNode::~CCullTreeNode(void)
+{
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pChild - 
+//-----------------------------------------------------------------------------
+void CCullTreeNode::AddCullTreeChild(CCullTreeNode *pChild)
+{
+	if ( pChild == NULL )
+		Assert( pChild );
+	else
+		m_Children.AddToTail(pChild);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pObject - 
+//-----------------------------------------------------------------------------
+void CCullTreeNode::AddCullTreeObject(CMapClass *pObject)
+{
+	// First make sure the object isn't already in this node.
+
+	// If it's already here, bail out.
+	if ( m_Objects.Find( pObject ) != -1 )
+		return;
+	
+	// Add the object.
+	m_Objects.AddToTail(pObject);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pObject - 
+//-----------------------------------------------------------------------------
+void CCullTreeNode::AddCullTreeObjectRecurse(CMapClass *pObject)
+{
+	//
+	// If the object intersects this node, add it to this node and recurse,
+	// testing each of our children in the same fashion.
+	//
+	Vector ObjMins;
+	Vector ObjMaxs;
+	pObject->GetCullBox(ObjMins, ObjMaxs);
+	if (BoxesIntersect(ObjMins, ObjMaxs, bmins, bmaxs))
+	{
+		int nChildCount = GetChildCount();
+		if (nChildCount != 0)
+		{
+			// dvs: we should split when appropriate!
+			// otherwise the tree becomes less optimal over time.
+			for (int nChild = 0; nChild < nChildCount; nChild++)
+			{
+				CCullTreeNode *pChild = GetCullTreeChild(nChild);
+				pChild->AddCullTreeObjectRecurse(pObject);
+			}
+		}
+		else
+		{
+			AddCullTreeObject(pObject);
+		}
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Removes all objects from this node.
+//-----------------------------------------------------------------------------
+void CCullTreeNode::RemoveAllCullTreeObjects(void)
+{
+	m_Objects.RemoveAll();
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Removes all objects from this branch of the tree recursively.
+//-----------------------------------------------------------------------------
+void CCullTreeNode::RemoveAllCullTreeObjectsRecurse(void)
+{
+	RemoveAllCullTreeObjects();
+
+	int nChildCount = GetChildCount();
+	for (int nChild = 0; nChild < nChildCount; nChild++)
+	{
+		CCullTreeNode *pChild = GetCullTreeChild(nChild);
+		pChild->RemoveAllCullTreeObjectsRecurse();
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Removes all instances of a given object from this node.
+// Input  : pObject - 
+//-----------------------------------------------------------------------------
+void CCullTreeNode::RemoveCullTreeObject(CMapClass *pObject)
+{
+	// Remove occurrence of pObject from the array
+	
+	m_Objects.FindAndRemove( pObject );
+
+	// make sure it's not in there twice
+	Assert( m_Objects.Find( pObject) == -1 );
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Removes all instances of a given object from this node.
+// Input  : pObject - 
+//-----------------------------------------------------------------------------
+void CCullTreeNode::RemoveCullTreeObjectRecurse(CMapClass *pObject)
+{
+	RemoveCullTreeObject(pObject);
+
+	for (int nChild = 0; nChild < m_Children.Count(); nChild++)
+	{
+		CCullTreeNode *pChild = m_Children[nChild];
+		pChild->RemoveCullTreeObjectRecurse(pObject);
+	}	
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Removes all instances of a given object from this node.
+// Input  : pObject - 
+//-----------------------------------------------------------------------------
+CCullTreeNode *CCullTreeNode::FindCullTreeObjectRecurse(CMapClass *pObject)
+{
+	for (int i = 0; i < m_Objects.Count(); i++)
+	{
+		CMapClass *pCurrent = m_Objects[i];
+		if (pCurrent == pObject)
+		{
+			return(this);
+		}
+	}
+
+	int nChildCount = GetChildCount();
+	for (int nChild = 0; nChild < nChildCount; nChild++)
+	{
+		CCullTreeNode *pChild = GetCullTreeChild(nChild);
+		CCullTreeNode *pFound = pChild->FindCullTreeObjectRecurse(pObject);
+		if (pFound != NULL)
+		{
+			return(pFound);
+		}
+	}
+
+	return(NULL);
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pObject - 
+//-----------------------------------------------------------------------------
+void CCullTreeNode::UpdateCullTreeObject(CMapClass *pObject)
+{
+	Vector mins;
+	Vector maxs;
+	pObject->GetCullBox(mins, maxs);
+
+	if (!BoxesIntersect(mins, maxs, bmins, bmaxs))
+	{
+		RemoveCullTreeObject(pObject);
+	}
+	else
+	{
+		AddCullTreeObject(pObject);
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: Updates the culling tree due to a change in the bounding box of a
+//			given object within the tree. The object is added to any leaf nodes
+//			that it now intersects, and is removed from any leaf nodes that it
+//			no longer intersects.
+// Input  : pObject - The object whose bounding box has changed.
+//-----------------------------------------------------------------------------
+void CCullTreeNode::UpdateCullTreeObjectRecurse(CMapClass *pObject)
+{
+	int nChildCount = GetChildCount();
+	if (nChildCount != 0)
+	{
+		for (int nChild = 0; nChild < nChildCount; nChild++)
+		{
+			CCullTreeNode *pChild = GetCullTreeChild(nChild);
+			pChild->UpdateCullTreeObjectRecurse(pObject);
+		}
+	}
+	else
+	{
+		UpdateCullTreeObject(pObject);
+	}
+}
+
+
+//-----------------------------------------------------------------------------
+// Purpose: 
+// Input  : pObject - The object whose bounding box has changed.
+//-----------------------------------------------------------------------------
+void CCullTreeNode::UpdateAllCullTreeObjectsRecurse(void)
+{
+	int nChildCount = GetChildCount();
+	if (nChildCount != 0)
+	{
+		for (int nChild = 0; nChild < nChildCount; nChild++)
+		{
+			CCullTreeNode *pChild = GetCullTreeChild(nChild);
+			pChild->UpdateAllCullTreeObjectsRecurse();
+		}
+	}
+	else
+	{
+		int nObjectCount = GetObjectCount();
+		for (int nObject = 0; nObject < nObjectCount; nObject++)
+		{
+			CMapClass *pObject = GetCullTreeObject(nObject);
+
+			Vector mins;
+			Vector maxs;
+			pObject->GetCullBox(mins, maxs);
+			if (!BoxesIntersect(mins, maxs, bmins, bmaxs))
+			{
+				RemoveCullTreeObject(pObject);
+			}
+		}
+	}
+}