source: GTP/trunk/Lib/Vis/Preprocessing/src/SubdivisionCandidate.h @ 2224

#ifndef SUBDIVISIONCANDIDATE_H
#define SUBDIVISIONCANDIDATE_H


#include "FlexibleHeap.h"

//

namespace GtpVisibilityPreprocessor {

class SubdivisionCandidate;

typedef std::vector<SubdivisionCandidate *> SubdivisionCandidateContainer;
typedef FlexibleHeap<SubdivisionCandidate *> SplitQueue;

/** Candidate for a view space / object space split.
*/
class SubdivisionCandidate: public Heapable
{  
public:

        enum {OBJECT_SPACE, VIEW_SPACE};

        SubdivisionCandidate(): 
                mRenderCostDecrease(0), 
                mAvgRayContribution(0), 
                mDirty(true) 
                {}

        virtual ~SubdivisionCandidate() {};
        
        /** Evaluate this subdivision candidate.
        */
        virtual void EvalCandidate(bool computeSplitplane = true) = 0;
        
        /** Returns type of this subdivision candidate.
        */
        virtual int Type() const = 0;
        
        /** Evaluate this candidate and put results into queue for further traversal.
        */
        virtual bool Apply(SplitQueue &splitQueue, bool terminationCriteriaMet, SubdivisionCandidateContainer &dirtyList) = 0;
        
        /** Returns true of the global termination criteria of this split were met,
                false otherwise.
        */
        virtual bool GlobalTerminationCriteriaMet() const = 0;
        
        /** Collects subdivision candidates that were affected by the
                application of this one.
        */
        virtual void CollectDirtyCandidates(SubdivisionCandidateContainer &dirtyList,
                                                                                const bool onlyUnmailed) = 0;

        /** Set render cost decrease achieved through this split.
        */
        inline void SetRenderCostDecrease(const float renderCostDecr)
        {
                mRenderCostDecrease = renderCostDecr;
        }
        
        inline float GetRenderCostDecrease() const
        {
                return mRenderCostDecrease;
        }

        /** The average ray contribution of this candidate .
                This is somewhat of a confidence value into the computed values. If
                it is high, there is likely to be a lot of undersampling.
        */
        inline void SetAvgRayContribution(const float rayContri)
        {
                mAvgRayContribution = rayContri;
        }
        
        inline float GetAvgRayContribution() const
        {
                return mAvgRayContribution;
        }

        /** Position in queue.
        */
        inline int GetPosition() const
        {
                return mPosition;
        }

        inline void SetSplitAxis(const int splitAxis)
        {
                mSplitAxis = splitAxis;
        }
        
        inline void SetMaxCostMisses(const int misses)
        {
                mMaxCostMisses = misses;
        }

        inline void SetPvsEntriesIncr(const int pvsEntriesIncr)
        {
                mPvsEntriesIncr = pvsEntriesIncr;
        }

        inline int GetSplitAxis() const
        {
                return mSplitAxis;
        }

        inline int GetMaxCostMisses() const
        {
                return mMaxCostMisses;
        }

        inline int GetPvsEntriesIncr() const
        {
                return mPvsEntriesIncr;
        }

        inline bool IsDirty() const
        {
                return mDirty;
        }

        inline void SetDirty(const bool dirty)
        {
                mDirty = dirty;
        }

        //////////
        //-- mailing stuff

        static void NewMail(const int reserve = 1) 
        {
                sMailId += sReservedMailboxes;
                sReservedMailboxes = reserve;
        }

        void Mail() { mMailbox = sMailId; }
        bool Mailed() const { return mMailbox == sMailId; }

        void Mail(const int mailbox) { mMailbox = sMailId + mailbox; }
        bool Mailed(const int mailbox) const { return mMailbox == sMailId + mailbox; }

        int IncMail() { return ++ mMailbox - sMailId; }


        // last mail id -> warning not thread safe!
        // both mailId and mailbox should be unique for each thread!!!
        static int sMailId;
        static int sReservedMailboxes;

        void *mEvaluationHack;

protected:

        /// split axis of this plane (0, 1, 2, or 3 if non-axis-aligned)
        int mSplitAxis;
        /// the number of misses of max cost ratio until this split
        int mMaxCostMisses;
        /// render cost decrease achieved through this split
        float mRenderCostDecrease;
        /// the decrease of the number of pvs entries
        int mPvsEntriesIncr;

        /// the average ray contribution of this candidate 
        float mAvgRayContribution;

        int mMailbox;

        bool mDirty;
};


}

// SUBDIVISIONCANDIDATE_H
#endif