assimp/code/Subdivision.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 helper class to evaluate subdivision surfaces.*/
#ifndef AI_SUBDISIVION_H_INC
#define AI_SUBDISIVION_H_INC
namespace Assimp	{

// ------------------------------------------------------------------------------
/** Helper class to evaluate subdivision surfaces. Different algorithms
 *  are provided for choice. */
// ------------------------------------------------------------------------------
class Subdivider
{
public:

	/** Enumerates all supported subvidision algorithms */
	enum Algorithm	{
		CATMULL_CLARKE = 0x1
	};

public:

	virtual ~Subdivider() {
	}

public:

	// ---------------------------------------------------------------
	/** Create a subdivider of a specific type
	 *
	 *  @param algo Algorithm to be used for subdivision
	 *  @return Subdivider instance. */
	static Subdivider* Create (Algorithm algo);

	// ---------------------------------------------------------------
	/** Subdivide a mesh using the selected algorithm
	 *
	 *  @param mesh First mesh to be subdivided. Must be in verbose
	 *    format.
	 *  @param out Receives the output mesh, allocated by me.
	 *  @param num Number of subdivisions to perform.
	 *  @param discard_input If true is passed, the input mesh is
	 *    deleted after the subdivision is complete. This can 
	 *    improve performance because it allows the optimization
	 *    to reuse the existing mesh for intermediate results.
	 *  @pre out!=mesh*/
	virtual void Subdivide (const aiMesh* mesh, 
		aiMesh*& out, unsigned int num,
		bool discard_input = false) = 0;

	// ---------------------------------------------------------------
	/** Subdivide multiple meshes using the selected algorithm. This
	 *  avoids erroneous smoothing on objects consisting of multiple
	 *  per-material meshes. Usually, most 3d modellers smooth on a
	 *  per-object base, regardless the materials assigned to the
	 *  meshes.
	 *
	 *  @param smesh Array of meshes to be subdivided. Must be in
	 *    verbose format.
	 *  @param nmesh Number of meshes in smesh.
	 *  @param out Receives the output meshes. The array must be
	 *    sufficiently large (at least @c nmesh elements) and may not
	 *    overlap the input array. Output meshes map one-to-one to
	 *    their corresponding input meshes. The meshes are allocated 
	 *    by the function.
	 *  @param discard_input If true is passed, input meshes are
	 *    deleted after the subdivision is complete. This can 
	 *    improve performance because it allows the optimization
	 *    of reusing existing meshes for intermediate results.
	 *  @param num Number of subdivisions to perform.
	 *  @pre nmesh != 0, smesh and out may not overlap*/
	virtual void Subdivide (
		const aiMesh* const * smesh, 
		size_t nmesh,
		aiMesh** out, 
		unsigned int num,
		bool discard_input = false) = 0;

private:
};

} // end namespace Assimp


#endif // !!  AI_SUBDISIVION_H_INC