source: GTP/trunk/Lib/Illum/IllumModule/OgreIllumModule/include/RenderTechniques/OgreCausticRecieverRenderTechnique.h @ 2240

#pragma once

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

#include "OgreRenderTechnique.h"
#include "CausticRecieverRenderTechnique.h"
#include "Ogre.h"

using namespace Ogre;

/**
        @brief CausticRecieverRenderTechnique used in an OGRE environment.

        This technique defines that the object will recieve caustic lighting from caustic caster objects.
        The caustic light spots will be calculated by the caustic caster's RenderingRuns.
        These runs will only be updated if caustic redievers are visible, so it is the reciever technique's
        responsibility to update them.

        Each caustic caster's light contribution will be added in separate passes. Each pass
        will add some light to the shaded image, so these passes should be the last passes.
        In the constructor the given Pass* parameter will be the pass after which the caustic lighting
        passes will be added by the technique.
*/
class OgreCausticRecieverRenderTechnique : public OgreRenderTechnique,
                                                                                public CausticRecieverRenderTechnique
{
public:
        /**
                @brief Constructor.

                @param maxcasters                               the maximum number of caustic casters from which this reciever can recieve caustic light
                @param causticVertexProgram             the vertex program to be used in the caustic gathering passes
                @param causticFragmentProgram   the fragment program to be used in the caustic gathering passes.
                                                                                It should have one pass and the caustic cubemap of a caster will be bound to the first sampler unit. 
                @param pass                                             the pass after which caustic gathering passes should be added
                @param parentRenderable                 the object to operate on
                @param parentTechniqueGroup             the TechniqueGroup this RenderedTechnique is attached to
        */
        OgreCausticRecieverRenderTechnique(
                                                        int maxcasters,
                                                        String causticVertexProgram,
                                                        String causticFragmentProgram,
                                                        Pass* pass,
                                                        OgreRenderable* parentRenderable,
                                                        OgreTechniqueGroup* parentTechniqueGroup
                                                        );
        /**
                @brief Destructor.
        */
        ~OgreCausticRecieverRenderTechnique();
        
        //inherited
        virtual void update(unsigned long frameNum);
        
protected:
        /**
                @brief the maximum number of caustic casters from which this reciever can recieve caustic light
        */
        int maxcasters;
        /**
                @brief the vertex program to be used in the caustic gathering passes
        */
        String causticVertexProgram;
        /**
                @brief the fragment program to be used in the caustic gathering passes

                It should have one pass and the caustic cubemap of a caster will be bound to the first sampler unit. 
        */
        String causticFragmentProgram;
        /**
                @breif new passes created by this technique
        */
        std::vector<Pass*> passes;
        /**
                @brief the nearest caustic casters found during update
        */
        std::vector<OgreSharedRuns*> causticCasters;
        
};

/**
        @brief RenderTechniqueFactory to create OgreCausticRecieverRenderTechnique instances.
*/
class OgreCausticRecieverRenderTechniqueFactory : public RenderTechniqueFactory
{
public:
        
        OgreCausticRecieverRenderTechniqueFactory();

        OgreRenderTechnique* createInstance(IllumTechniqueParams* params,
                                                                                Pass* pass,
                                                                                OgreRenderable* parentRenderable,
                                                                                OgreTechniqueGroup* parentTechniqueGroup);


        int maxcasters;
        String causticVertexProgram;
        String causticFragmentProgram;

};