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Open Asset Import Library (assimp)

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/** @file ColladaExporter.h

 * Declares the exporter class to write a scene to a Collada file

 */

#ifndef AI_COLLADAEXPORTER_H_INC

#define AI_COLLADAEXPORTER_H_INC

#include <assimp/ai_assert.h>

#include <assimp/material.h>

#include <array>

#include <map>

#include <sstream>

#include <unordered_set>

#include <vector>

struct aiScene;

struct aiNode;

struct aiLight;

struct aiBone;

namespace Assimp {

class IOSystem;

/// Helper class to export a given scene to a Collada file. Just for my personal

/// comfort when implementing it.

class ColladaExporter final {

public:

    /// Constructor for a specific scene to export

    ColladaExporter(const aiScene *pScene, IOSystem *pIOSystem, const std::string &path, const std::string &file);

    /// Destructor

    virtual ~ColladaExporter() = default;

protected:

    /// Starts writing the contents

    void WriteFile();

    /// Writes the asset header

    void WriteHeader();

    /// Writes the embedded textures

    void WriteTextures();

    /// Writes the material setup

    void WriteMaterials();

    /// Writes the cameras library

    void WriteCamerasLibrary();

    // Write a camera entry

    void WriteCamera(size_t pIndex);

    /// Writes the cameras library

    void WriteLightsLibrary();

    // Write a camera entry

    void WriteLight(size_t pIndex);

    void WritePointLight(const aiLight *const light);

    void WriteDirectionalLight(const aiLight *const light);

    void WriteSpotLight(const aiLight *const light);

    void WriteAmbientLight(const aiLight *const light);

    /// Writes the controller library

    void WriteControllerLibrary();

    /// Writes a skin controller of the given mesh

    void WriteController(size_t pIndex);

    /// Writes the geometry library

    void WriteGeometryLibrary();

    /// Writes the given mesh

    void WriteGeometry(size_t pIndex);

    //enum FloatDataType { FloatType_Vector, FloatType_TexCoord2, FloatType_TexCoord3, FloatType_Color, FloatType_Mat4x4, FloatType_Weight };

    // customized to add animation related type

    enum FloatDataType { FloatType_Vector,

        FloatType_TexCoord2,

        FloatType_TexCoord3,

        FloatType_Color,

        FloatType_Mat4x4,

        FloatType_Weight,

        FloatType_Time };

    /// Writes a float array of the given type

    void WriteFloatArray(const std::string &pIdString, FloatDataType pType, const ai_real *pData, size_t pElementCount);

    /// Writes the scene library

    void WriteSceneLibrary();

    // customized, Writes the animation library

    void WriteAnimationsLibrary();

    void WriteAnimationLibrary(size_t pIndex);

    std::string mFoundSkeletonRootNodeID = "skeleton_root"; // will be replaced by found node id in the WriteNode call.

    /// Recursively writes the given node

    void WriteNode(const aiNode *pNode);

    /// Enters a new xml element, which increases the indentation

    void PushTag() { startstr.append("  "); }

    /// Leaves an element, decreasing the indentation

    void PopTag() {

        ai_assert(startstr.length() > 1);

        startstr.erase(startstr.length() - 2);

    }

    void CreateNodeIds(const aiNode *node);

    /// Get or Create a unique Node ID string for the given Node

    std::string GetNodeUniqueId(const aiNode *node);

    std::string GetNodeName(const aiNode *node);

    std::string GetBoneUniqueId(const aiBone *bone);

    enum class AiObjectType {

        Mesh,

        Material,

        Animation,

        Light,

        Camera,

        Count,

    };

    /// Get or Create a unique ID string for the given scene object index

    std::string GetObjectUniqueId(AiObjectType type, size_t pIndex);

    /// Get or Create a name string for the given scene object index

    std::string GetObjectName(AiObjectType type, size_t pIndex);

    typedef std::map<size_t, std::string> IndexIdMap;

    typedef std::pair<std::string, std::string> NameIdPair;

    NameIdPair AddObjectIndexToMaps(AiObjectType type, size_t pIndex);

    // Helpers

    inline IndexIdMap &GetObjectIdMap(AiObjectType type) { return mObjectIdMap[static_cast<size_t>(type)]; }

    inline IndexIdMap &GetObjectNameMap(AiObjectType type) { return mObjectNameMap[static_cast<size_t>(type)]; }

private:

    std::unordered_set<std::string> mUniqueIds; // Cache of used unique ids

    std::map<const void *, std::string> mNodeIdMap; // Cache of encoded node and bone ids

    std::array<IndexIdMap, static_cast<size_t>(AiObjectType::Count)> mObjectIdMap; // Cache of encoded unique IDs

    std::array<IndexIdMap, static_cast<size_t>(AiObjectType::Count)> mObjectNameMap; // Cache of encoded names

public:

    /// Stringstream to write all output into

    std::stringstream mOutput;

    /// The IOSystem for output

    IOSystem *mIOSystem;

    /// Path of the directory where the scene will be exported

    const std::string mPath;

    /// Name of the file (without extension) where the scene will be exported

    const std::string mFile;

    /// The scene to be written

    const aiScene *const mScene;

    std::string mSceneId;

    bool mAdd_root_node = false;

    /// current line start string, contains the current indentation for simple stream insertion

    std::string startstr;

    /// current line end string for simple stream insertion

    const std::string endstr;

    // pair of color and texture - texture precedences color

    struct Surface {

        bool exist;

        aiColor4D color;

        std::string texture;

        size_t channel;

        Surface() {

            exist = false;

            channel = 0;

        }

    };

    struct Property {

        bool exist;

        ai_real value;

        Property() :

                exist(false),

                value(0.0) {}

    };

    // summarize a material in an convenient way.

    struct Material {

        std::string id;

        std::string name;

        std::string shading_model;

        Surface ambient, diffuse, specular, emissive, reflective, transparent, normal;

        Property shininess, transparency, index_refraction;

        Material() = default;

    };

    std::map<unsigned int, std::string> textures;

public:

    /// Dammit C++ - y u no compile two-pass? No I have to add all methods below the struct definitions

    /// Reads a single surface entry from the given material keys

    bool ReadMaterialSurface(Surface &poSurface, const aiMaterial &pSrcMat, aiTextureType pTexture, const char *pKey, size_t pType, size_t pIndex);

    /// Writes an image entry for the given surface

    void WriteImageEntry(const Surface &pSurface, const std::string &imageId);

    /// Writes the two parameters necessary for referencing a texture in an effect entry

    void WriteTextureParamEntry(const Surface &pSurface, const std::string &pTypeName, const std::string &materialId);

    /// Writes a color-or-texture entry into an effect definition

    void WriteTextureColorEntry(const Surface &pSurface, const std::string &pTypeName, const std::string &imageId);

    /// Writes a scalar property

    void WriteFloatEntry(const Property &pProperty, const std::string &pTypeName);

};

} // namespace Assimp

#endif // !! AI_COLLADAEXPORTER_H_INC