source: trunk/VUT/GtpVisibilityPreprocessor/src/RenderSimulator.h @ 441

#ifndef _RenderSimulator_h__
#define _RenderSimulator_h__

#include "common.h"
#include "Statistics.h"

class BspTree;
class KdTree;
class ViewCell;
class KdLeaf;

class SimulationStatistics: public StatisticsBase
{
public:
        /// view cell with the biggest "cost"
        float maxCost;
        /// view cell with the minimal "cost"
    float minCost;
        /// average render time
        float avgRenderTime;
        /// average render time with the overhead when crossing view cells
        float avgRtWithoutOverhead;
  
        void Reset() 
        {
                maxCost = 0;
                minCost = 999999;
                avgRenderTime = 0;
                avgRtWithoutOverhead = 0;
        }

        void Print(ostream &app) const;

        friend ostream &operator<<(ostream &s, const SimulationStatistics &stat) 
        {
                stat.Print(s);
                return s;
        }  

        SimulationStatistics()
        {
                Reset();
        }
};

/** Simulated rendering using a simple render heuristics. Used to evaluate the 
        quality of the view cell partition.
*/
class RenderSimulator
{

public:
        RenderSimulator();
        /** Constructor taking the estimated render cost, 
                the view cell overhead,
                and the average move speed of the player into account.
        */
        RenderSimulator(float objRendercost, float vcOverhead, float moveSpeed);

        /** Simulates rendering of the view cells.
                @returns the statistics of the simulation.
        */
        virtual SimulationStatistics SimulateRendering() = 0;

        /** Sets estimated render time for a single object in the PVS.
        */
        void SetObjectRenderCost(const float objRenderCost);

        /** Contant overhead for crossing a view cell border.
        */
        void SetVcOverhead(const float vcOverhead);

        /** Average move speed of the player during rendering.
        */
        void SetMoveSpeed(const float moveSpeed);


protected:

        /// render time for single object of the PVS
        float mObjRenderCost;
        /// const overhead for crossing a view cell border
        float mVcOverhead;
        /// move speed of player
        float mMoveSpeed;
};

class BspRenderSimulator: public RenderSimulator
{
public:
        BspRenderSimulator(BspTree *bspTree);

        BspRenderSimulator(float objRenderCost, 
                                                           float vcOverhead, 
                                                           float moveSpeed, 
                                                           BspTree *bspTree);

        SimulationStatistics SimulateRendering();

protected:
        /** Simulates rendering of the pvs of one view cell, with given rendering time for an object.
                @param viewCell the view cell holding the Pvs
                @param objRenderTime estimated render time for one object of the Pvs
        */
        Real RenderPvs(ViewCell &viewCell, const float objRenderTime) const;

        BspTree *mBspTree;
};

class KdRenderSimulator: public RenderSimulator
{
public:
        KdRenderSimulator(KdTree *kdTree);

        KdRenderSimulator(float objRenderCost, 
                                                          float vcOverhead, 
                                                          float moveSpeed, 
                                                          KdTree *kdTree);
        SimulationStatistics SimulateRendering();

protected:

        Real RenderPvs(KdLeaf *leaf, float objRenderTime) const;

        KdTree *mKdTree;
};

#endif // RenderSimulator