CWE-ou-minkata/Sources/Plasma/PubUtilLib/plDrawable/plSpaceTreeMaker.h

/*==LICENSE==*

CyanWorlds.com Engine - MMOG client, server and tools
Copyright (C) 2011  Cyan Worlds, Inc.

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
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GNU General Public License for more details.

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along with this program.  If not, see <http://www.gnu.org/licenses/>.

Additional permissions under GNU GPL version 3 section 7

If you modify this Program, or any covered work, by linking or
combining it with any of RAD Game Tools Bink SDK, Autodesk 3ds Max SDK,
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*==LICENSE==*/

#ifndef plSpaceTreeMaker_inc
#define plSpaceTreeMaker_inc

#include "hsBounds.h"
#include "hsTemplates.h"
#include "hsBitVector.h"

class hsRadixSortElem;
class plSpaceTree;
 
class plSpacePrepNode
{
public:
    hsBounds3Ext        fWorldBounds;

    int16_t               fIndex;
    int16_t               fDataIndex;

    plSpacePrepNode*    fChildren[2];
};

class plSpaceTreeMaker
{
protected:
    hsTArray<plSpacePrepNode*>      fLeaves; // input

    hsRadixSortElem*                fSortScratch;

    hsBitVector                     fDisabled;

    plSpacePrepNode*                fPrepTree;
    int16_t                           fTreeSize;

    plSpacePrepNode*                INewSubRoot(const hsBounds3Ext& bnd);
    void                            IFindBigList(hsTArray<plSpacePrepNode*>& nodes, float length, const hsVector3& axis, hsTArray<plSpacePrepNode*>& giants, hsTArray<plSpacePrepNode*>& strimp);
    void                            ISortList(hsTArray<plSpacePrepNode*>& nodes, const hsVector3& axis);
    void                            ISplitList(hsTArray<plSpacePrepNode*>& nodes, const hsVector3& axis, hsTArray<plSpacePrepNode*>& lower, hsTArray<plSpacePrepNode*>& upper);
    hsBounds3Ext                    IFindDistToCenterAxis(hsTArray<plSpacePrepNode*>& nodes, float& length, hsVector3& axis);
    plSpacePrepNode*                IMakeFatTreeRecur(hsTArray<plSpacePrepNode*>& nodes);
    hsBounds3Ext                    IFindSplitAxis(hsTArray<plSpacePrepNode*>& nodes, float& length, hsVector3& axis);
    plSpacePrepNode*                IMakeTreeRecur(hsTArray<plSpacePrepNode*>& nodes);

    void                            IMakeTree();

    plSpaceTree*                    IMakeEmptyTree();
    plSpaceTree*                    IMakeDegenerateTree();
    void                            IGatherLeavesRecur(plSpacePrepNode* sub, plSpaceTree* tree);
    void                            IMakeSpaceTreeRecur(plSpacePrepNode* sub, plSpaceTree* tree, const int targetLevel, int currLevel);
    plSpaceTree*                    IMakeSpaceTree();
    int                             ITreeDepth(plSpacePrepNode* subRoot);
    
    void                            IDeleteTreeRecur(plSpacePrepNode* node);

public:

    void                            Cleanup();

    void                            Reset();
    int32_t                           AddLeaf(const hsBounds3Ext& worldBnd, hsBool disable=false);
    plSpaceTree*                    MakeTree();

    void                            TestTree(); // development only - NUKE ME mf horse
};

#endif // plSpaceTreeMaker_inc