source: GTP/trunk/App/Demos/Illum/pathmap/SubEntity.h @ 2197

#pragma once

#include <vector>
#include "Vector.hpp"
#include "Transformed.h"
class Mesh;
class SubMesh;
class Entity;
class RenderStrategy;

class SubEntity
{
        friend class FinalCompositionRenderStrategy;

protected:
        Entity*                         parent;
        int                                     nNearClusters;

        SubMesh*                        subMesh;                //!< mesh
        Transformed*            rayTraceEntity; //!< raytracable entity containing the subMesh's TriangleMesh
        
        LPDIRECT3DTEXTURE9 prmTexture;          //!< a collection of tiled UV atlases containing illuminaton contributions of nearest entry point clusters
        LPDIRECT3DSURFACE9 prmSurface;          //!< prmTexture's surface

        int                                     prmxres;
        int                                     prmyres;

        void createRayTraceEntity();            //!< setup rayTraceEntity

        //! array of cluster indices storing which clusters are relevant. PRM tiles correspond to these clusters
        unsigned int nearClusterIndices[32];


public:
        //! clear PRM to float4(0, 0, 0, 0)
        void clearPRM();

        //! render contributions of virtual light sources in 'bushRadions' to atlas corresponding to cluster 'bushId'
        void renderPRM( std::vector<Radion>& clusterRadions, unsigned int clusterId);

        //! downscale pixel values according to alpha (render-to-the-pixel counter) to get rid of overlapping edge artifacts
        void normalizePRM();

        //! fill the nearClusterIndices array
        void findNearClusters(const std::vector<Radion>& starters, unsigned int nClusters);

public:
        SubEntity(Entity* parent, SubMesh* subMesh, int nNearClusters);
        ~SubEntity(void);

        Intersectable* getRayTraceEntity();

        void draw(const RenderStrategy& renderStrategy);
        float getSurfaceArea();
        const Material* sampleSurface(Radion& sample);

        void savePRM();
        void loadPRM();

        void saveSceneInfo(std::ofstream& psf);
};