assimp/code/PretransformVertices.h

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

Copyright (c) 2006-2008, ASSIMP Development Team
All rights reserved.

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  copyright notice, this list of conditions and the
  following disclaimer.

* Redistributions in binary form must reproduce the above
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  following disclaimer in the documentation and/or other
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  contributors may be used to endorse or promote products
  derived from this software without specific prior
  written permission of the ASSIMP Development Team.

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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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*/

/** @file PretransformVertices.h
 *  @brief Defines a post processing step to pretransform all 
 *    vertices in the scenegraph 
 */
#ifndef AI_PRETRANSFORMVERTICES_H_INC
#define AI_PRETRANSFORMVERTICES_H_INC

#include "BaseProcess.h"
#include "../include/aiMesh.h"

class PretransformVerticesTest;
namespace Assimp	{

// ---------------------------------------------------------------------------
/** The PretransformVertices pretransforms all vertices in the nodegraph
 *  and removes the whole graph. The output is a list of meshes, one for
 *  each material.
*/
class ASSIMP_API PretransformVertices : public BaseProcess
{
	friend class Importer;
	friend class ::PretransformVerticesTest;

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

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

public:

	// -------------------------------------------------------------------
	// Check whether step is active
	bool IsActive( unsigned int pFlags) const;

	// -------------------------------------------------------------------
	// Execute step on a given scene
	void Execute( aiScene* pScene);

	// -------------------------------------------------------------------
	// Setup import settings
	void SetupProperties(const Importer* pImp);


	// -------------------------------------------------------------------
	/** @brief Toggle the 'keep hierarchy' option
	 *  @param d hm ... difficult to guess what this means, hu!?
	 */
	void KeepHierarchy(bool d) {
		configKeepHierarchy = d;
	}

	// -------------------------------------------------------------------
	/** @brief Check whether 'keep hierarchy' is currently enabled.
	 *  @return ...
	 */
	bool IsHierarchyKept() const {
		return configKeepHierarchy;
	}

private:

	// -------------------------------------------------------------------
	// Count the number of nodes
	unsigned int CountNodes( aiNode* pcNode );

	// -------------------------------------------------------------------
	// Get a bitwise combination identifying the vertex format of a mesh
	unsigned int GetMeshVFormat(aiMesh* pcMesh);

	// -------------------------------------------------------------------
	// Count the number of vertices in the whole scene and a given
	// material index
	void CountVerticesAndFaces( aiScene* pcScene, aiNode* pcNode, 
		unsigned int iMat,
		unsigned int iVFormat, 
		unsigned int* piFaces,
		unsigned int* piVertices);

	// -------------------------------------------------------------------
	// Collect vertex/face data
	void CollectData( aiScene* pcScene, aiNode* pcNode,
		unsigned int iMat,
		unsigned int iVFormat, 
		aiMesh* pcMeshOut, 
		unsigned int aiCurrent[2],
		unsigned int* num_refs);

	// -------------------------------------------------------------------
	// Get a list of all vertex formats that occur for a given material
	// The output list contains duplicate elements
	void GetVFormatList( aiScene* pcScene, unsigned int iMat,
		std::list<unsigned int>& aiOut);

	// -------------------------------------------------------------------
	// Compute the absolute transformation matrices of each node
	void ComputeAbsoluteTransform( aiNode* pcNode );

	// -------------------------------------------------------------------
	// Simple routine to build meshes in worldspace, no further optimization
	void BuildWCSMeshes(std::vector<aiMesh*>& out, aiMesh** in,
		unsigned int numIn, aiNode* node);

	// -------------------------------------------------------------------
	// Apply the node transformation to a mesh
	void ApplyTransform(aiMesh* mesh, const aiMatrix4x4& mat);

	// -------------------------------------------------------------------
	// Reset transformation matrices to identity
	void MakeIdentityTransform(aiNode* nd);

	// -------------------------------------------------------------------
	// Build reference counters for all meshes
	void BuildMeshRefCountArray(aiNode* nd, unsigned int * refs);



	//! Configuration option: keep scene hierarchy as long as possible
	bool configKeepHierarchy, configNormalize;

};

} // end of namespace Assimp

#endif // !!AI_GENFACENORMALPROCESS_H_INC