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sdk/lowlevel/source/NvBlastFamilyGraph.h

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#ifndef NVBLASTFAMILYGRAPH_H
#define NVBLASTFAMILYGRAPH_H


#include "NvBlastSupportGraph.h"
#include "NvBlastFixedArray.h"
#include "NvBlastFixedBitmap.h"
#include "NvBlastFixedBoolArray.h"
#include "NvBlastMath.h"
#include "NvBlastFixedPriorityQueue.h"
#include "NvBlastMemory.h"


namespace Nv
{
namespace Blast
{


typedef uint32_t NodeIndex;
typedef NodeIndex IslandId;
typedef uint32_t ActorIndex;

class FamilyGraph
{
public:


    FamilyGraph(const SupportGraph* graph);


    static size_t   requiredMemorySize(uint32_t nodeCount, uint32_t bondCount)
    {
        return fillMemory(nullptr, nodeCount, bondCount);
    }



    void            initialize(ActorIndex actorIndex, const SupportGraph* graph);

    bool            notifyEdgeRemoved(ActorIndex actorIndex, NodeIndex node0, NodeIndex node1, const SupportGraph* graph);
    bool            notifyEdgeRemoved(ActorIndex actorIndex, NodeIndex node0, NodeIndex node1, uint32_t bondIndex, const SupportGraph* graph);

    bool            notifyNodeRemoved(ActorIndex actorIndex, NodeIndex nodeIndex, const SupportGraph* graph);

    uint32_t        findIslands(ActorIndex actorIndex, void* scratch, const SupportGraph* graph);

    static size_t   findIslandsRequiredScratch(uint32_t graphNodeCount);



    NvBlastBlockData(IslandId, m_islandIdsOffset, getIslandIds);

    NvBlastBlockData(NodeIndex, m_dirtyNodeLinksOffset, getDirtyNodeLinks);

    NvBlastBlockData(uint32_t, m_firstDirtyNodeIndicesOffset, getFirstDirtyNodeIndices);

    NvBlastBlockData(NodeIndex, m_fastRouteOffset, getFastRoute);

    NvBlastBlockData(uint32_t, m_hopCountsOffset, getHopCounts);

    NvBlastBlockData(FixedBoolArray, m_isEdgeRemovedOffset, getIsEdgeRemoved);

    NvBlastBlockData(FixedBoolArray, m_isNodeInDirtyListOffset, getIsNodeInDirtyList);



    uint32_t    getEdgesCount(const SupportGraph* graph) const;
    bool        hasEdge(NodeIndex node0, NodeIndex node1, const SupportGraph* graph) const;
    bool        canFindRoot(NodeIndex startNode, NodeIndex targetNode, FixedArray<NodeIndex>* visitedNodes, const SupportGraph* graph);


private:

    FamilyGraph& operator = (const FamilyGraph&);


    struct TraversalState
    {
        NodeIndex mNodeIndex;
        uint32_t mCurrentIndex;
        uint32_t mPrevIndex;
        uint32_t mDepth;

        TraversalState()
        {
        }

        TraversalState(NodeIndex nodeIndex, uint32_t currentIndex, uint32_t prevIndex, uint32_t depth) :
            mNodeIndex(nodeIndex), mCurrentIndex(currentIndex), mPrevIndex(prevIndex), mDepth(depth)
        {
        }
    };

    struct QueueElement
    {
        TraversalState* mState;
        uint32_t mHopCount;

        QueueElement()
        {
        }

        QueueElement(TraversalState* state, uint32_t hopCount) : mState(state), mHopCount(hopCount)
        {
        }
    };

    struct NodeComparator
    {
        NodeComparator()
        {
        }

        bool operator() (const QueueElement& node0, const QueueElement& node1) const
        {
            return node0.mHopCount < node1.mHopCount;
        }
    private:
        NodeComparator& operator = (const NodeComparator&);
    };

    typedef FixedPriorityQueue<QueueElement, NodeComparator> NodePriorityQueue;



    static size_t   fillMemory(FamilyGraph* familyGraph, uint32_t nodeCount, uint32_t bondCount);

    bool            findRoute(NodeIndex startNode, NodeIndex targetNode, IslandId islandId, FixedArray<TraversalState>* visitedNodes, FixedBitmap* isNodeWitness, NodePriorityQueue* priorityQueue, const SupportGraph* graph);

    bool            tryFastPath(NodeIndex startNode, NodeIndex targetNode, IslandId islandId, FixedArray<TraversalState>* visitedNodes, FixedBitmap* isNodeWitness, const SupportGraph* graph);

    void            unwindRoute(uint32_t traversalIndex, NodeIndex lastNode, uint32_t hopCount, IslandId id, FixedArray<TraversalState>* visitedNodes);

    void            addToDirtyNodeList(ActorIndex actorIndex, NodeIndex node);

    NodeIndex       getAdjacentNode(uint32_t adjacencyIndex, const SupportGraph* graph) const
    {
        const uint32_t bondIndex = graph->getAdjacentBondIndices()[adjacencyIndex];
        return getIsEdgeRemoved()->test(bondIndex) ? invalidIndex<uint32_t>() : graph->getAdjacentNodeIndices()[adjacencyIndex];
    }

};


} // namespace Blast
} // namespace Nv


#endif // ifndef NVBLASTFAMILYGRAPH_H

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