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

/*==LICENSE==*

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

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*==LICENSE==*/

#ifndef plSpaceTree_inc
#define plSpaceTree_inc

#include "hsTemplates.h"
#include "hsBounds.h"
#include "pnFactory/plCreatable.h"
#include "hsBitVector.h"

class hsStream;
class hsResMgr;
class plVolumeIsect;

class plSpaceTreeNode 
{
public:
    enum {
        kNone           = 0x0,
        kIsLeaf         = 0x1,
        kDirty          = 0x2,
        kDisabled       = 0x4,
        kEmpty          = 0x8,
        kEnabledTemp    = 0x10
    };

    hsBounds3Ext        fWorldBounds;

    uint16_t              fFlags; // mostly for alignment;
    int16_t               fParent;
    union {
        int16_t               fChildren[2]; // Children are actually in same array as parent
        int16_t               fLeafIndex;
    };

    int16_t               GetChild(int w) const { hsAssert(!(fFlags & kIsLeaf), "Getting Child of leaf node"); return fChildren[w]; }
    int16_t               GetParent() const { return fParent; }
    int16_t               GetLeaf() const { hsAssert(fFlags & kIsLeaf, "Getting leaf idx off interior node"); return fLeafIndex; }
    bool                IsLeaf() const { return 0 != (fFlags & kIsLeaf); }
    const hsBounds3Ext& GetWorldBounds() const { return fWorldBounds; }

    // Kind of hate this. Would like to blast the whole thing in, but
    // the bounds are a real class.
    void                Read(hsStream* s);
    void                Write(hsStream* s);
};


class plSpaceTree : public plCreatable
{
public:
    enum plHarvestFlags {
        kNone                   = 0x0,
        kSortBackToFront        = 0x1,
        kSortFrontToBack        = 0x2
    };
    enum {
        kRootParent = -1
    };
private:
    hsTArray<plSpaceTreeNode>       fTree;
    const hsBitVector*              fCache;

    int16_t                           fRoot;
    int16_t                           fNumLeaves;

    uint16_t                          fHarvestFlags;

    mutable plVolumeIsect*          fCullFunc;

    hsPoint3                        fViewPos;

    void        IRefreshRecur(int16_t which);
    
    void        IHarvestAndCullLeaves(const plSpaceTreeNode& subRoot, hsTArray<int16_t>& list) const;
    void        IHarvestLeaves(const plSpaceTreeNode& subRoot, hsTArray<int16_t>& list) const;
    
    void        IHarvestAndCullLeaves(const plSpaceTreeNode& subRoot, hsBitVector& totList, hsBitVector& list) const;
    void        IHarvestLeaves(const plSpaceTreeNode& subRoot, hsBitVector& totList, hsBitVector& list) const;

    void        IHarvestLevel(int16_t subRoot, int level, int currLevel, hsTArray<int16_t>& list) const;

    void        IHarvestAndCullEnabledLeaves(int16_t subRoot, const hsBitVector& cache, hsTArray<int16_t>& list) const;
    void        IHarvestEnabledLeaves(int16_t subRoot, const hsBitVector& cache, hsTArray<int16_t>& list) const;
    void        IHarvestEnabledLeaves(int16_t subIdx, const hsBitVector& cache, hsBitVector& totList, hsBitVector& list) const;

    void        IEnableLeaf(int16_t idx, hsBitVector& cache) const;

public:
    plSpaceTree();
    virtual ~plSpaceTree();

    CLASSNAME_REGISTER( plSpaceTree );
    GETINTERFACE_ANY( plSpaceTree, plCreatable );

    void SetViewPos(const hsPoint3& p) { fViewPos = p; }
    const hsPoint3& GetViewPos() const { return fViewPos; }

    const plSpaceTreeNode&  GetNode(int16_t w) const { return fTree[w]; }
    int16_t                   GetRoot() const { return fRoot; }
    bool                    IsRoot(int16_t w) const { return fRoot == w; }
    bool                    IsLeaf(int16_t w) const { return GetNode(w).IsLeaf(); }

    void HarvestLeaves(hsBitVector& totList, hsBitVector& list) const;
    void HarvestLeaves(hsBitVector& list) const;
    void HarvestLeaves(plVolumeIsect* cullFunc, hsBitVector& list) const;
    void HarvestLeaves(int16_t subRoot, hsBitVector& list) const;
    void HarvestLeaves(int16_t subRoot, hsBitVector& totList, hsBitVector& list) const;

    void HarvestLeaves(hsTArray<int16_t>& list) const;
    void HarvestLeaves(plVolumeIsect* cullFunc, hsTArray<int16_t>& list) const;
    void HarvestLeaves(int16_t subRoot, hsTArray<int16_t>& list) const;

    void EnableLeaf(int16_t idx, hsBitVector& cache) const;
    void EnableLeaves(const hsTArray<int16_t>& list, hsBitVector& cache) const;
    void HarvestEnabledLeaves(plVolumeIsect* cullFunc, const hsBitVector& cache, hsTArray<int16_t>& list) const;
    void SetCache(const hsBitVector* cache) { fCache = cache; }

    void BitVectorToList(hsTArray<int16_t>& list, const hsBitVector& bitVec) const;

    void SetHarvestFlags(plHarvestFlags f) { fHarvestFlags = f; }
    uint16_t GetHarvestFlags() const { return fHarvestFlags; }

    uint16_t HasLeafFlag(int16_t w, uint16_t f) const { return GetNode(w).fFlags & f; }
    void SetLeafFlag(int16_t w, uint16_t f, bool on=true);
    void ClearLeafFlag(int16_t w, uint16_t f);
    void ClearTreeFlag(uint16_t f);
    void SetTreeFlag(uint16_t f, bool on=true);

    bool IsDisabled(uint16_t w) const { return (GetNode(w).fFlags & plSpaceTreeNode::kDisabled) || (fCache && !fCache->IsBitSet(w)); }

    // Should GetWorldBounds check and refresh if needed?
    const hsBounds3Ext& GetWorldBounds() const { return GetNode(GetRoot()).fWorldBounds; }

    void MoveLeaf(int16_t idx, const hsBounds3Ext& newWorldBnd);
    void Refresh();
    bool IsEmpty() const { return 0 != (GetNode(GetRoot()).fFlags & plSpaceTreeNode::kEmpty); }
    bool IsDirty() const { return 0 != (GetNode(GetRoot()).fFlags & plSpaceTreeNode::kDirty); }
    void MakeDirty() { fTree[GetRoot()].fFlags |= plSpaceTreeNode::kDirty; }

    int16_t GetNumLeaves() const { return fNumLeaves; }

    virtual void Read(hsStream* s, hsResMgr* mgr);
    virtual void Write(hsStream* s, hsResMgr* mgr);

    void HarvestLevel(int level, hsTArray<int16_t>& list) const;

    friend class plSpaceTreeMaker;
};

#endif // plSpaceTree_inc