#pragma once

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

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

using namespace Ogre;

struct PathMapClusters;
/**
	@brief A technique that defines that the rendering of the object will use the path map technique.

	This rendering technique can add indirect lighting to the scene.
*/
class OgrePathMapRenderTechnique : public OgreRenderTechnique
{
public:
	/**
		@brief Constructor.

		@param passBlendingSRC			source blend factor of the new pass
		@param passBlendingDEST			destination blend factor of the new pass
		@param pass						the pass after which shadowing passes should be added
		@param parentRenderable			the object to operate on
		@param parentTechniqueGroup		the TechniqueGroup this RenderedTechnique is attached to
	*/
	OgrePathMapRenderTechnique(
							SceneBlendFactor passBlendingSRC,
							SceneBlendFactor passBlendingDEST,
							bool createNewPasses,
							int startTextureUnitID,
							Pass* pass,
							OgreRenderable* parentRenderable,
							OgreTechniqueGroup* parentTechniqueGroup
							);
	/**
		@brief Destructor.
	*/
	virtual ~OgrePathMapRenderTechnique();
	
	//inherited
	virtual void update(unsigned long frameNum);
	
protected:
	/**
		@brief the new pass created by this technique
	*/
	Pass* pathMapPass;
	/**
		@brief the PathMapClusters structure that belongs to the subentity renderable
	*/
	PathMapClusters* clusters;
	/**
		@brief the weight index lookup map created by this technique
	*/
	Texture* weightIndexTexture;
	/**
		@brief create a weight index lookup map
	*/
	void createWeightIndexTexture();
	/**
		@brief source blend factor of the new pass
	*/
	SceneBlendFactor passBlendingSRC;
	/**
		@brief destination blend factor of the new pass
	*/
	SceneBlendFactor passBlendingDEST;
	bool createNewPasses;
	int startTextureUnitID;
};

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

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

	virtual bool needMaterialCopy(IllumTechniqueParams* params){return true;}

	SceneBlendFactor passBlendingSRC;
	SceneBlendFactor passBlendingDEST;
	bool createNewPasses;
	int startTextureUnitID;
};