assimp/code/SplitLargeMeshes.h

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

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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"

class SplitLargeMeshesTest;
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: ConfigProperty.java, 
//  ConfigProperty.DEFAULT_VERTEX_SPLIT_LIMIT
//  ConfigProperty.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 SplitLargeMeshesProcess_Vertex;

public:

	SplitLargeMeshesProcess_Triangle();
	~SplitLargeMeshesProcess_Triangle();

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.
	*/
	virtual void SetupProperties(const Importer* pImp);


	//! Set the split limit - needed for unit testing
	inline void SetLimit(unsigned int l)
		{LIMIT = l;}

	//! Get the split limit
	inline unsigned int GetLimit() const
		{return LIMIT;}

protected:

	// -------------------------------------------------------------------
	/** 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);

	// -------------------------------------------------------------------
	//! 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 
	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
{
public:

	SplitLargeMeshesProcess_Vertex();
	~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;

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


	//! Set the split limit - needed for unit testing
	inline void SetLimit(unsigned int l)
		{LIMIT = l;}

	//! Get the split limit
	inline unsigned int GetLimit() const
		{return LIMIT;}

protected:

	// -------------------------------------------------------------------
	/** 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);

	// -------------------------------------------------------------------
	//! 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 
	unsigned int LIMIT;
};

} // end of namespace Assimp

#endif // !!AI_SPLITLARGEMESHES_H_INC