assimp/code/SplitLargeMeshes.h

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

Copyright (c) 2006-2008, 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 split large meshes into submeshes
 */
#ifndef AI_SPLITLARGEMESHES_H_INC
#define AI_SPLITLARGEMESHES_H_INC

#include <vector>
#include "BaseProcess.h"
#include "../include/aiMesh.h"
#include "../include/aiScene.h"

namespace Assimp
{

class SplitLargeMeshesProcess_Triangle; 
class SplitLargeMeshesProcess_Vertex; 

// NOTE: If you change these limits, don't forget to change the
// corresponding values in all Assimp ports

// **********************************************************
// Java: PostProcessStep.java, 
//  PostProcessStep.DEFAULT_VERTEX_SPLIT_LIMIT
//  PostProcessStep.DEFAULT_TRIANGLE_SPLIT_LIMIT
// **********************************************************

// default limit for vertices
#if (!defined AI_SLM_DEFAULT_MAX_VERTICES)
#	define AI_SLM_DEFAULT_MAX_VERTICES		1000000
#endif

// default limit for triangles
#if (!defined AI_SLM_DEFAULT_MAX_TRIANGLES)
#	define AI_SLM_DEFAULT_MAX_TRIANGLES		1000000
#endif

// ---------------------------------------------------------------------------
/** Postprocessing filter to split large meshes into submeshes
 *
 * Applied BEFORE the JoinVertices-Step occurs.
 * Returns NON-UNIQUE vertices, splits by triangle number.
*/
class SplitLargeMeshesProcess_Triangle : public BaseProcess
{
	friend class Importer;
	friend class SplitLargeMeshesProcess_Vertex;

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

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

public:
	// -------------------------------------------------------------------
	/** Returns whether the processing step is present in the given flag field.
	* @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;

	// -------------------------------------------------------------------
	/** Executes the post processing step on the given imported data.
	* At the moment a process is not supposed to fail.
	* @param pScene The imported data to work at.
	*/
	void Execute( aiScene* pScene);


private:

	//! Apply the algorithm to a given mesh
	void SplitMesh (unsigned int a, aiMesh* pcMesh,
		std::vector<std::pair<aiMesh*, unsigned int> >& avList);

	//! Update a node in the asset after a few of its meshes have been split
	static void UpdateNode(aiNode* pcNode,
		const std::vector<std::pair<aiMesh*, unsigned int> >& avList);

public:
	//! Triangle limit set via aiSetTriangleSplitLimit()
	static unsigned int LIMIT;
};


// ---------------------------------------------------------------------------
/** Postprocessing filter to split large meshes into submeshes
 *
 * Applied AFTER the JoinVertices-Step occurs.
 * Returns UNIQUE vertices, splits by vertex number.
*/
class SplitLargeMeshesProcess_Vertex : public BaseProcess
{
	friend class Importer;

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

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

public:
	// -------------------------------------------------------------------
	/** Returns whether the processing step is present in the given flag field.
	* @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;

	// -------------------------------------------------------------------
	/** Executes the post processing step on the given imported data.
	* At the moment a process is not supposed to fail.
	* @param pScene The imported data to work at.
	*/
	void Execute( aiScene* pScene);

private:

	//! Apply the algorithm to a given mesh
	void SplitMesh (unsigned int a, aiMesh* pcMesh,
		std::vector<std::pair<aiMesh*, unsigned int> >& avList);

	// NOTE: Reuse SplitLargeMeshesProcess_Triangle::UpdateNode()

public:
	//! Triangle limit set via aiSetTriangleSplitLimit()
	static unsigned int LIMIT;
};

} // end of namespace Assimp

#endif // !!AI_SPLITLARGEMESHES_H_INC