assimp/code/PostProcessing/PretransformVertices.h

/*
Open Asset Import Library (assimp)
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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 "Common/BaseProcess.h"

#include <assimp/mesh.h>

#include <list>
#include <vector>

// Forward declarations
struct aiNode;

class PretransformVerticesTest;

namespace Assimp {

// ---------------------------------------------------------------------------
/** The PretransformVertices pre-transforms all vertices in the node tree
 *  and removes the whole graph. The output is a list of meshes, one for
 *  each material.
*/
class ASSIMP_API PretransformVertices : public BaseProcess {
public:
    // -------------------------------------------------------------------
    /// The default class constructor / destructor.
	PretransformVertices();
	~PretransformVertices() override = default;

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

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

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

	// -------------------------------------------------------------------
	/** @brief Toggle the 'keep hierarchy' option
     *  @param keep    true for keep configuration.
     */
	void KeepHierarchy(bool keep) {
		configKeepHierarchy = keep;
	}

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

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

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

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

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

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

	// -------------------------------------------------------------------
	// 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) const;

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

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

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

	//! Configuration option: keep scene hierarchy as long as possible
	bool configKeepHierarchy;
	bool configNormalize;
	bool configTransform;
	aiMatrix4x4 configTransformation;
	bool mConfigPointCloud;
};

} // end of namespace Assimp

#endif // !!AI_GENFACENORMALPROCESS_H_INC