source: GTP/branches/IllumWPdeliver2008dec/IlluminationWP/precompiled/include/OgreIllumModule/RenderingRuns/OgreLightVolumeRenderingRun.h @ 3255

#pragma once

//disable inheritance warning caused by multiple inheritance
#if _WIN32
#if _MSC_VER
#pragma warning(disable: 4250)
#endif
#endif

#include "OgreRenderingRun.h"
#include "LightVolumeRenderingRun.h"
#include "OgreSharedRuns.h"


/**
        @brief LightVolumeRenderingRun used in an OGRE environment.
*/
class __declspec( dllexport ) OgreLightVolumeRenderingRun : public OgreRenderingRun,
                                                                        public LightVolumeRenderingRun
{       
public:

        /**
                @brief Constructor.

                @param sharedRuns                       a pointer to the OgreSharedRuns this run belongs to
                @param name                                     the name of the light volume texture to be created
                @param startFrame                       adds an offset to the current frame number to help evenly distribute updates between frames
                @param updateInterval           update frequency
                @param resolution                       light volume texture resolution
                @param materialName                     the name of the material should be used when rendering the light volume
        */      
        OgreLightVolumeRenderingRun(OgreSharedRuns* sharedRuns,
                                                                String name,
                                                                unsigned long startFrame,
                                                                unsigned long updateInterval,
                                                                unsigned int resolution,
                                                                unsigned int textureDepth,
                                                                String materialName);

        virtual ~OgreLightVolumeRenderingRun(){}

        /**
                @brief returns the name of the resulting light volume texture
        */
        String getLightVolumeTextureName()
        {
                if(textureDepth == 1)
                        return lightVolumeTexture2->getName();
                else
                        return lightVolumeTexture3D->getName();
        }
        /**
                @brief Refreshes light camera matrices, called in each update.
        */
        void refreshLight();
        /**
                @brief Returns the light matrix used while rendering the light volume.
        */
        Matrix4 getLightViewProjectionMatrix()
        {
                Matrix4 m = lightVolumeCamera->getProjectionMatrixWithRSDepth() * lightVolumeCamera->getViewMatrix();
                Vector4 unitX(1,0,0,1);
                Vector4 unitY(0,1,0,1);
                Vector4 unitZ(0,0,1,1);
                Vector4 tX = m * unitX;
                Vector4 tY = m * unitY;
                Vector4 tZ = m * unitZ;
                return  m;
                                
        }
        
        void freeAllResources();

protected:      
        /**
                @brief the name of the material should be used when rendering the light volume
        */
        String materialName;
        /**
                @brief pointer to the nearest light source to the particle system
        */
        Light* light;
        /**
                @brief pointer to the camera used while rendering the light volume
        */
        Camera* lightVolumeCamera;
        /**
                @brief a pointer to the OgreSharedRuns this run belongs to
        */
        OgreSharedRuns* sharedRuns;
        /**
                @brief the name of the light volume texture that was created by this run
        */
        String name;
        
        Texture* lightVolumeTexture;
        Texture* lightVolumeTexture2;
        Texture* lightVolumeTextureThis;
        Texture* lightVolumeTextureLast;
        
        Texture* lightVolumeTexture3D;

        unsigned char* volumeBuffer;
        /**
                @brief the radius of the particle system
        */
        float systemRadius;     
        void createVolumeBuffer();
        
        //inherited
        void updateFrame(unsigned long frameNum);       
        //inherited
        inline void createLightVolumeMap();

};