source: GTP/trunk/Lib/Vis/Preprocessing/src/PvsBase.h @ 2530

#ifndef __PVSBASE_H
#define __PVSBASE_H

#include "common.h"
#include "Containers.h"



namespace GtpVisibilityPreprocessor {


/** Information stored with a PVS entry. Consists of the number
        the object was seen from the view cell.
*/
template<typename T, typename S>
struct PvsEntry 
{
public:

        PvsEntry(): mObject(NULL), mData(0) {}
        PvsEntry(T sample): mObject(sample), mData(0) {}
        PvsEntry(T sample, const S &data): mObject(sample), mData(data) {}

        T mObject;
        S mData;

        template<typename T, typename S>
        friend int operator< (const PvsEntry<T, S> &a, const PvsEntry<T, S> &b);
        template<typename T, typename S>
        friend int operator== (const PvsEntry<T, S> &a, const PvsEntry<T, S> &b);
};


template<typename T, typename S>
int operator< (const PvsEntry<T, S> &a, const PvsEntry<T, S> &b)
{
        return a.mObject < b.mObject;
} 

template<typename T, typename S>
int operator== (const PvsEntry<T, S> &a, const PvsEntry<T, S> &b)
{
        return a.mObject == b.mObject;
} 


template<typename T, typename S>
struct LtSample
{
    bool operator()(const PvsEntry<T, S> &a, const PvsEntry<T, S> &b) const
    {
                return a.mObject < b.mObject;
        } 
};

template<typename T, typename S>
int equalSample (const PvsEntry<T, S> &a, const PvsEntry<T, S> &b)
{
        return a.mObject == b.mObject;
} 

/** Information stored with a PVS entry. Consists of the number
        the object was seen from the view cell.
*/
struct PvsData 
{
public:
        PvsData() {}
        PvsData(const float sumPdf):
        mSumPdf(sumPdf) {}
        
        // $$JB in order to return meaningfull values
        // it assumes that the sum pdf has been normalized somehow!!!
        inline float GetVisibility() { return mSumPdf; }

        /// sum of probability density of visible sample rays
        float mSumPdf;
};


class MailablePvsData 
{
public:
        // sum of probability density of visible sample rays
        float mSumPdf;
        int mCounter;

        MailablePvsData() {}
        MailablePvsData(const float sumPdf):
        mSumPdf(sumPdf) {}

        // $$JB in order to return meaningfull values
        // it assumes that the sum pdf has been normalized somehow!!!
        inline float GetVisibility() { return mSumPdf; }


        ///////////////
        //  Mailing stuff

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

        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; }
        
        //////////////////////////////////////////

protected:

        int mMailbox;

};

}

#endif