source: GTP/trunk/Lib/Illum/IllumModule/OgreIllumModule/include/OgreRenderTechnique.h @ 2320

#pragma once 
#include "RenderTechnique.h"
#include "OgreRenderable.h"
#include "OgreSharedRuns.h"

class OgreTechniqueGroup;

/**
        @brief Event handler class.

        The derived calsses of this class can register task that should be done before and/or after updating all RenderTechniques.
        UpdateListeners can be registered to the OgreIlluminationMager. @see addUpdateListener
*/
class UpdateListener
{
public:
        /**
                @brief Called before RenderTechnique updates
        */
        virtual void preAllUpdates(){}
        /**
                @brief Called after RenderTechnique updates
        */
        virtual void postAllUpdates(){}
};

/**
        @brief Class of RenderTechniques used in an OGRE environment.   
*/
class OgreRenderTechnique : virtual public RenderTechnique
{
        public:
                /**
                        @brief Constructor. 

                        @param the pass to operate on
                        @param parentRenderable the object to operate on
                        @param parentTechniqueGroup the TechniqueGroup this RenderedTechnique is attached to
                */
                OgreRenderTechnique(
                                                Pass* pass,
                                                OgreRenderable* parentRenderable,
                                                OgreTechniqueGroup* parentTechniqueGroup);
                virtual ~OgreRenderTechnique( );

                //inherited
                virtual OgreRenderTechnique* asOgreRenderTechnique(){return this;}
                                
        protected:
                /**
                        @brief a OgreRenderable pointer to the renderable this technique operates on.
                */
                OgreRenderable* parentOgreRenderable;
                /**
                        @brief a OgreTechniqueGroup pointer to the TechniqueGroup this technique is attached to.
                */
                OgreTechniqueGroup* parentOgreTechniqueGroup;
                /**
                        @brief a pointer to the pass this technique operates on.
                */
                Pass* pass;             
};

/**
        @brief Base abstract class for creating RenderTechnique instances.
*/
class RenderTechniqueFactory
{
protected:
        
        /**
                @brief function for parsing RenderTechnique attributes

                @param params attribute value stored in a String
        */
        typedef void (*ILLUM_ATTRIBUTE_PARSER)(String& params, RenderTechniqueFactory* factory);
        /**
                @brief Keyword-mapped attribute parsers.
        */
        typedef std::map<String, ILLUM_ATTRIBUTE_PARSER> AttribParserList;
        
        /**
                @brief map of parser functions
        */
        AttribParserList attributeParsers;
        /**
                @brief factoryname
        */
        String typeName;

public: 
        /**
                @brief Returns if this factory can create a RenderTechnique of the given type.

                @param type RenderTechnique type
        */
        bool isType(String type)
        {
                return typeName == type;
        }
        
        /**
                @brief Creates a RenderTechnique of the factory type.

                @param params containes constructor parameters as NameValuePairList
                @param pass the Pass to use in RenderTechnique constructor
                @param pass the parentRenderable to pass to RenderTechnique constructor
                @param pass the parentTechniqueGroup to pass to RenderTechnique constructor
        */
        virtual OgreRenderTechnique* createInstance(IllumTechniqueParams* params,
                                                                                Pass* pass,
                                                                                OgreRenderable* parentRenderable,
                                                                                OgreTechniqueGroup* parentTechniqueGroup) = 0;
        /**
                @brief parses parameters from the material file.

                The parsed parameters will be passed to the new RenderTechnique's constructor.

                @param params pointer to the IllumTechniqueParams structure that was read from the material script and containes the parameters to be parsed.

        */
        virtual void parseParams(IllumTechniqueParams* params);
        
        
};