CWE-ou-minkata/Sources/Tools/MaxConvert/plDistTree.cpp

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*==LICENSE==*/

#include "hsTypes.h"
#include "Max.h"


#include "plDistTree.h"

plDistTree::plDistTree()
:   fRoot(-1)
{
}

plDistTree::~plDistTree()
{
}

void plDistTree::Reset()
{
    fRoot = -1;
    fNodes.Reset();
}

void plDistTree::AddBoxIData(const Box3& box, const Box3& fade, UInt32 iData)
{
    fRoot = IAddNodeRecur(fRoot, box, fade, iData);
}

BOOL plDistTree::BoxClear(const Box3& box, const Box3& fade) const
{
    return IBoxClearRecur(fRoot, box, fade);
}

BOOL plDistTree::PointClear(const Point3& pt, const Box3& fade) const
{
    return IPointClearRecur(fRoot, pt, fade);
}

BOOL plDistTree::IFadesClear(const Box3& fade0, const Box3& fade1) const
{
    // Only two ways fade can come out non-overlapping.
    // Either fade0 fades out before fade1 fades in, or v.v.

    // First case, does fade0 fade out?
    if( fade0.Max()[2] > 0 )
    {
        // does fade1 fade in?
        if( fade1.Min()[2] < 0 )
        {
            // Okay they do, does fade0 fade out before fade1 fades in?
            if( fade0.Max()[0] <= fade1.Min()[0] )
                return true;
        }
    }
    // Second case, same thing but reversed order
    if( fade1.Max()[2] > 0 )
    {
        // does fade0 fade in?
        if( fade0.Min()[2] < 0 )
        {
            // Okay they do, does fade1 fade out before fade0 fades in?
            if( fade1.Max()[0] <= fade0.Min()[0] )
                return true;
        }
    }
    return false;
}

BOOL plDistTree::IBox0ContainsBox1(const Box3& box0, const Box3& box1, const Box3& fade0, const Box3& fade1) const
{
#ifdef MAX_CONTAINS_WORKS
    if( !box0.Contains(box1) )
        return false;
#else MAX_CONTAINS_WORKS
    if( (box0.Min()[0] > box1.Min()[0])
        ||(box0.Min()[1] > box1.Min()[1])
        ||(box0.Min()[2] > box1.Min()[2])
        ||(box0.Max()[0] < box1.Max()[0])
        ||(box0.Max()[1] < box1.Max()[1])
        ||(box0.Max()[2] < box1.Max()[2]) )
        return false;
#endif // MAX_CONTAINS_WORKS

    if( IFadesClear(fade0, fade1) )
        return false;

    return true;
}

BOOL plDistTree::IBoxesClear(const Box3& box0, const Box3& box1) const
{
    return (box0.Min()[0] > box1.Max()[0])
        ||(box0.Max()[0] < box1.Min()[0])

        ||(box0.Min()[1] > box1.Max()[1])
        ||(box0.Max()[1] < box1.Min()[1])

        ||(box0.Min()[2] > box1.Max()[2])
        ||(box0.Max()[2] < box1.Min()[2]);
}

BOOL plDistTree::IBoxClearRecur(Int32 iNode, const Box3& box, const Box3& fade) const
{
    if( iNode < 0 )
        return true;

    if( IBoxesClear(fNodes[iNode].fBox, box) )
        return true;

    if( IFadesClear(fNodes[iNode].fFade, fade) )
        return true;

    if( fNodes[iNode].IsLeaf() )
        return false;

    int i;
    for( i = 0; i < 8; i++ )
    {
        if( !IBoxClearRecur(fNodes[iNode].fChildren[i], box, fade) )
            return false;
    }
    return true;
}

BOOL plDistTree::IPointClearRecur(Int32 iNode, const Point3& pt, const Box3& fade) const
{
    if( iNode < 0 )
        return true;

    if( !fNodes[iNode].fBox.Contains(pt) )
        return true;

    if( IFadesClear(fNodes[iNode].fFade, fade) )
        return true;

    if( fNodes[iNode].IsLeaf() )
        return false;

    int i;
    for( i = 0; i < 8; i++ )
    {
        if( !IPointClearRecur(fNodes[iNode].fChildren[i], pt, fade) )
            return false;
    }
    return true;
}


Int32 plDistTree::IAddNodeRecur(Int32 iNode, const Box3& box, const Box3& fade, UInt32 iData)
{
    // if iNode < 0, make a node for box and return that.
    if( iNode < 0 )
    {
        return INextNode(box, fade, iData);
    }

    // if the box is contained
    //      if this node is a leaf, pitch the box
    //
    //      else
    //          recur on one of 8 children, based on
    //          box's center relative to node center.

    // if the box doesn't intercect this node,
    //      replace this node with a node of combined boxes.
    //      this node becomes sibling of box.

    // if the box does intercect, but isn't contained
    //      same thing.


#if 0
    if( IBox0ContainsBox1(fNodes[iNode].fBox, box, fNodes[iNode].fFade, fade) )
    {
        if( !fNodes[iNode].IsLeaf() )
#else
    if( !fNodes[iNode].IsLeaf() && IBox0ContainsBox1(fNodes[iNode].fBox, box, fNodes[iNode].fFade, fade) )
    {
#endif
        {
            Int32 iChild = IGetChild(fNodes[iNode].fBox, box);
        
            Int32 iChildNode = IAddNodeRecur(fNodes[iNode].fChildren[iChild], box, fade, iData);
            fNodes[iNode].fChildren[iChild] = iChildNode;

            fNodes[iNode].fBox += fNodes[fNodes[iNode].fChildren[iChild]].fBox;
        }
        return iNode;
    }
    else
    {
        return IMergeNodes(iNode, box, fade, iData);
    }
}

Int32 plDistTree::IMergeNodes(Int32 iNode, const Box3& box, const Box3& fade, UInt32 iData)
{
    Box3 parBox = box;
    parBox += fNodes[iNode].fBox;

    Int32 pNode = INextNode(parBox, NonFade(), UInt32(-1));
    Int32 iChild = IGetChild(parBox, box);

    Int32 cNode = INextNode(box, fade, iData);

    fNodes[pNode].fChildren[iChild] = cNode;

    // Put the original node in the opposite quadrant from the child.
    // This handles the case where one of the bounds completely contains
    // the other. The octant structure of the tree isn't relied on, it
    // only helps balance the tree. So being wrong here won't hurt anything.
    iChild = iChild ^ 0x7;

    fNodes[pNode].fChildren[iChild] = iNode;

    fNodes[pNode].SetIsLeaf(false);

    return pNode;
}

Int32 plDistTree::IGetChild(const Box3& parent, const Box3& child) const
{
    Point3 parCenter = parent.Center();
    Point3 chiCenter = child.Center();

    Int32 idx = ((parCenter[0] < chiCenter[0]) << 0)
        | ((parCenter[1] < chiCenter[1]) << 1)
        | ((parCenter[2] < chiCenter[2]) << 2);
    return idx;
}

Int32 plDistTree::INextNode(const Box3& box, const Box3& fade, UInt32 iData)
{
    Int32 iNode = fNodes.GetCount();

    fNodes.Push();

    fNodes[iNode].fFlags = plDistNode::kIsLeaf;
    fNodes[iNode].fBox = box;
    fNodes[iNode].fFade = fade;
    fNodes[iNode].fIData = iData;
    fNodes[iNode].fChildren[0]
        = fNodes[iNode].fChildren[1]
        = fNodes[iNode].fChildren[2]
        = fNodes[iNode].fChildren[3]
        = fNodes[iNode].fChildren[4]
        = fNodes[iNode].fChildren[5]
        = fNodes[iNode].fChildren[6]
        = fNodes[iNode].fChildren[7] = -1;

    return iNode;
}

void plDistTree::HarvestBox(const Box3& box, Tab<Int32>& out) const
{
    IHarvestBoxRecur(fRoot, box, out);
}

void plDistTree::IHarvestBoxRecur(Int32 iNode, const Box3& box, Tab<Int32>& out) const
{
    if( iNode < 0 )
        return;

    if( IBoxesClear(fNodes[iNode].fBox, box) )
        return;

    if( fNodes[iNode].IsLeaf() )
    {
        out.Append(1, &iNode);
    }
    else
    {
        int i;
        for( i = 0; i < 8; i++ )
            IHarvestBoxRecur(fNodes[iNode].fChildren[i], box, out);
    }
}