#pragma once

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

#include "OgreRenderTechnique.h"
#include "IllumVolumeRenderTechnique.h"

/**
	@brief IllumVolumeRenderTechnique used in an OGRE environment.
*/
class __declspec( dllexport ) OgreIllumVolumeRenderTechnique : public OgreRenderTechnique,
											public IllumVolumeRenderTechnique
{
public:
	/**
		@brief Constructor.

		@param startFrame					adds an offset to the current frame number to help evenly distribute updates between frames
		@param illumVolumeUpdateInterval	the update frequency of the light volume
		@param illumTextureResolution		the resolution of the light volume texture
		@param textureDepth					the number of layers to use (should be set to 1)
		@param illumTexID					the id of the texture unit state the resulting illum volume should be bound to
		@param useDistCalc					flag to skip updates if the shaded particle system is far away (not used)
		@param materialName					the name of the material that is used while rendering the light volume
		@param lightMatrixGPUParamName		the name of the gpu program parameter where the light matrix should be bound to
		@param useHierarchicalImpostor		set this flag to true if the particle system is a hierarchical particle system
		@param impostorTexID				the id of the texture unit state where the impostor image of the smaller system should be bound to
		@param pass							the pass to operate on			
		@param parentRenderable				the object to operate on
		@param parentTechniqueGroup			the TechniqueGroup this RenderedTechnique is attached to
	*/
	OgreIllumVolumeRenderTechnique(unsigned long startFrame,
							unsigned long illumVolumeUpdateInterval,
							unsigned int illumTextureResolution,
							unsigned int textureDepth,
							unsigned char illumTexID,
							bool useDistCalc,
							String materialName,
							String lightMatrixGPUParamName,
							bool useHierarchicalImpostor,
							unsigned char impostorTexID,
							Pass* pass,
							OgreRenderable* parentRenderable,
							OgreTechniqueGroup* parentTechniqueGroup
							);
	/**
		@brief Destructor.
	*/
	virtual ~OgreIllumVolumeRenderTechnique();
	
protected:
	/**
		@brief the name of the material that is used while rendering the light volume
	*/
	String materialName;
	/**
		@brief the id of the texture unit state the resulting illumevolume should be bound to
	*/
	unsigned char illumTexID;
	/**
		@brief the name of the gpu program parameter where the light matrix should be bound to
	*/
	String lightMatrixGPUParamName;
	/**
		@brief the id of the texture unit state where the impostor image of the smaller system should be bound to
	*/
	unsigned char impostorTexID;
	
	//inherited
	RenderingRun* createLightVolumeRenderingRun();
	//inherited
	void lightVolumeChanged(RenderingRun* run);
	//inherited
	void lightVolumeUpdated(RenderingRun* run);
	//inherited
	void hierarchicalImpostorUpdated(RenderingRun* run);
};

/**
	@brief RenderTechniqueFactory to create OgreIllumVolumeRenderTechnique instances.
*/
class __declspec( dllexport ) OgreIllumVolumeRenderTechniqueFactory : public RenderTechniqueFactory
{
public:
	
	OgreIllumVolumeRenderTechniqueFactory();

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

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

	String materialName;
	unsigned char illumTexID;
	unsigned long startFrame;	
	unsigned long illumVolumeUpdateInterval;
	unsigned int illumTextureResolution;
	unsigned int textureDepth;	
	bool useDistCalc;
	String lightMatrixGPUParamName;
	unsigned char impostorTexID;
	bool useHierarchicalImpostor;	
};