/** Helper class to construct a dummy mesh for file formats containing only motion data */

/*
Open Asset Import Library (assimp)
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*/

/** @file SkeletonMeshBuilder.h
 *  Declares SkeletonMeshBuilder, a tiny utility to build dummy meshes
 *  for animation skeletons.
 */

#pragma once
#ifndef AI_SKELETONMESHBUILDER_H_INC
#define AI_SKELETONMESHBUILDER_H_INC

#ifdef __GNUC__
#pragma GCC system_header
#endif

#include <assimp/mesh.h>
#include <vector>

struct aiMaterial;
struct aiScene;
struct aiNode;

namespace Assimp {

// ---------------------------------------------------------------------------
/**
 * This little helper class constructs a dummy mesh for a given scene
 * the resembles the node hierarchy. This is useful for file formats
 * that don't carry any mesh data but only animation data.
 */
class ASSIMP_API SkeletonMeshBuilder {
public:
    // -------------------------------------------------------------------
    /** The constructor processes the given scene and adds a mesh there.
     *
     * Does nothing if the scene already has mesh data.
     * @param pScene The scene for which a skeleton mesh should be constructed.
     * @param root The node to start with. nullptr is the scene root
     * @param bKnobsOnly Set this to true if you don't want the connectors
     *   between the knobs representing the nodes.
     */
    SkeletonMeshBuilder(aiScene *pScene, aiNode *root = nullptr,
            bool bKnobsOnly = false);

protected:
    // -------------------------------------------------------------------
    /** Recursively builds a simple mesh representation for the given node
     * and also creates a joint for the node that affects this part of
     * the mesh.
     * @param pNode The node to build geometry for.
     */
    void CreateGeometry(const aiNode *pNode);

    // -------------------------------------------------------------------
    /** Creates the mesh from the internally accumulated stuff and returns it.
     */
    aiMesh *CreateMesh();

    // -------------------------------------------------------------------
    /** Creates a dummy material and returns it. */
    aiMaterial *CreateMaterial();

private:
    /** space to assemble the mesh data: points */
    std::vector<aiVector3D> mVertices;

    /** faces */
    struct Face {
        unsigned int mIndices[3];
        Face();
        Face(unsigned int p0, unsigned int p1, unsigned int p2) {
            mIndices[0] = p0;
            mIndices[1] = p1;
            mIndices[2] = p2;
        }
    };
    std::vector<Face> mFaces;

    /** bones */
    std::vector<aiBone *> mBones;

    bool mKnobsOnly;
};

} // end of namespace Assimp

#endif // AI_SKELETONMESHBUILDER_H_INC
