source: GTP/branches/IllumWPdeliver2008dec/IlluminationWP/precompiled/include/IllumModule/RenderingRuns/ReducedCubeMapRenderingRun.h @ 3255

#pragma once
#include "RenderingRun.h"

/**
        @brief Base abstract class __declspec( dllexport ) that defines a rendering process of a downsampled color-cubemap.

        The resulting cubemap is a lower resolution variation of the color cube map. It is created with averaging the original cubemap.
        The lower resolution cubemap can be convolved faster and can efficiently be used in effects like diffuse reflection.
*/
class __declspec( dllexport ) ReducedCubeMapRenderingRun : virtual public RenderingRun
{       
public:
        /**
                @brief Constructor.

                @param startFrame                               adds an offset to the current frame number to help evenly distribute updates between frames
                @param updateInterval                   update frequency
                @param resolution                               reduced cubemap resolution
                @param useDistCalc                              flag to skip cube face update if object is far away
                @param useFaceAngleCalc                 flag to skip cube face update if face is neglible
                @param distTolerance                    distance tolerance used in face skip
                @param angleTolerance                   angle tolerance used in face skip
                @param updateAllFace                    defines if all cubemap faces should be updated in a frame or only one face per frame            
        */
        ReducedCubeMapRenderingRun(unsigned long startFrame,
                                                                unsigned long updateInterval,
                                                                unsigned int resolution,
                                                                bool useDistCalc,
                                                                bool useFaceAngleCalc,
                                                                float distTolerance,
                                                                float angleTolerance,
                                                                bool updateAllFace);

        
        virtual ~ReducedCubeMapRenderingRun(){}

protected:
        /**
                        @brief defines if all cubemap faces should be updated in a frame or only one face per frame
        */
        bool updateAllFace;
        /**
                @brief the number of the face to be updated
        */
        unsigned char currentFace;      
        /**
                @brief the resolution of the cubemap texture that was created by this run
        */
        unsigned int resolution;
        /**
                @brief a flag to skip cube face update if object is far away or too small.

                @see distTolerance
        */
        bool useDistCalc;
        /**
                @brief a flag to skip cube face update the face is neglible.

                @see angleTolerance
        */
        bool useFaceAngleCalc;
        /**
                @brief A value used in face skip test.

                The higher this value gets the more precise, but slower the method will be.
        */
        float distTolerance;
        /**
                @brief A value used in face skip test.

                The higher this value gets the more precise, but slower the method will be.
        */
        float angleTolerance;

        /**
                @brief Creates the reduced size cubemap texture.
        */
        virtual inline void createReducedCubeMap() = 0;
        /**
                @brief Updates one face of the cubemap.

                @param facenum the number of the face to be updated
        */
        virtual inline void updateCubeFace(int facenum) = 0;
        /**
                @brief Checks if a cubemap face needs to be updated.

                If the object we are updating the cubemap for is far from the camera, or too small, or
                the given cubemapface does not have significant effect on the rendering the face can be skipped.

                @param facenum the number of the face to be checked
        */
    virtual bool faceNeedsUpdate(int facenum) = 0; 
        //inherited
        virtual void updateFrame(unsigned long frameNum);               
        
};