assimp/code/CalcTangentsProcess.h

/*
Open Asset Import Library (ASSIMP)
----------------------------------------------------------------------

Copyright (c) 2006-2010, ASSIMP Development Team
All rights reserved.

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  following disclaimer.

* Redistributions in binary form must reproduce the above
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*/


/** @file Defines a post processing step to calculate tangents and 
    bitangents on all imported meshes.*/
#ifndef AI_CALCTANGENTSPROCESS_H_INC
#define AI_CALCTANGENTSPROCESS_H_INC

#include "BaseProcess.h"

struct aiMesh;

namespace Assimp
{

// ---------------------------------------------------------------------------
/** The CalcTangentsProcess calculates the tangent and bitangent for any vertex
 * of all meshes. It is expected to be run before the JoinVerticesProcess runs
 * because the joining of vertices also considers tangents and bitangents for 
 * uniqueness.
 */
class ASSIMP_API CalcTangentsProcess : public BaseProcess
{
	friend class Importer;

protected:
	/** Constructor to be privately used by Importer */
	CalcTangentsProcess();

	/** Destructor, private as well */
	~CalcTangentsProcess();

public:
	// -------------------------------------------------------------------
	/** Returns whether the processing step is present in the given flag.
	* @param pFlags The processing flags the importer was called with.
	*   A bitwise combination of #aiPostProcessSteps.
	* @return true if the process is present in this flag fields,
	*   false if not.
	*/
	bool IsActive( unsigned int pFlags) const;

	// -------------------------------------------------------------------
	/** Called prior to ExecuteOnScene().
	* The function is a request to the process to update its configuration
	* basing on the Importer's configuration property list.
	*/
	void SetupProperties(const Importer* pImp);


	// setter for configMaxAngle
	inline void SetMaxSmoothAngle(float f)
	{
		configMaxAngle =f;
	}

protected:

	// -------------------------------------------------------------------
	/** Calculates tangents and bitangents for a specific mesh.
	* @param pMesh The mesh to process.
	* @param meshIndex Index of the mesh
	*/
	bool ProcessMesh( aiMesh* pMesh, unsigned int meshIndex);

	// -------------------------------------------------------------------
	/** Executes the post processing step on the given imported data.
	* @param pScene The imported data to work at.
	*/
	void Execute( aiScene* pScene);

private:

	/** Configuration option: maximum smoothing angle, in radians*/
	float configMaxAngle;
	unsigned int configSourceUV;
};

} // end of namespace Assimp

#endif // AI_CALCTANGENTSPROCESS_H_INC