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Open Asset Import Library (assimp)

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*/

/** @file IRRLoader.h

 *  @brief Declaration of the .irrMesh (Irrlight Engine Mesh Format)

 *  importer class.

 */

#ifndef AI_IRRLOADER_H_INCLUDED

#define AI_IRRLOADER_H_INCLUDED

#include "IRRShared.h"

#include "Common/Importer.h"

#include <assimp/SceneCombiner.h>

#include <assimp/StringUtils.h>

#include <assimp/anim.h>

#include <assimp/material.h>

namespace Assimp {

// ---------------------------------------------------------------------------

/** Irr importer class.

 *

 * Irr is the native scene file format of the Irrlight engine and its editor

 * irrEdit. As IrrEdit itself is capable of importing quite many file formats,

 * it might be a good file format for data exchange.

 */

class IRRImporter : public BaseImporter, public IrrlichtBase {

public:

    IRRImporter();

    ~IRRImporter() override;

    // -------------------------------------------------------------------

    /** Returns whether the class can handle the format of the given file.

     *  See BaseImporter::CanRead() for details.

     */

    bool CanRead(const std::string &pFile, IOSystem *pIOHandler,

            bool checkSig) const override;

protected:

    const aiImporterDesc *GetInfo() const override;

    void InternReadFile(const std::string &pFile, aiScene *pScene, IOSystem *pIOHandler) override;

    void SetupProperties(const Importer *pImp) override;

private:

    /** Data structure for a scene-graph node animator

     */

    struct Animator {

        // Type of the animator

        enum AT {

            UNKNOWN = 0x0,

            ROTATION = 0x1,

            FLY_CIRCLE = 0x2,

            FLY_STRAIGHT = 0x3,

            FOLLOW_SPLINE = 0x4,

            OTHER = 0x5

        } type;

        explicit Animator(AT t = UNKNOWN) :

                type(t), speed(ai_real(0.001)), direction(ai_real(0.0), ai_real(1.0), ai_real(0.0)), circleRadius(ai_real(1.0)), tightness(ai_real(0.5)), loop(true), timeForWay(100) {

        }

        // common parameters

        ai_real speed;

        aiVector3D direction;

        // FLY_CIRCLE

        aiVector3D circleCenter;

        ai_real circleRadius;

        // FOLLOW_SPLINE

        ai_real tightness;

        std::vector<aiVectorKey> splineKeys;

        // ROTATION (angles given in direction)

        // FLY STRAIGHT

        // circleCenter = start, direction = end

        bool loop;

        int timeForWay;

    };

    /** Data structure for a scene-graph node in an IRR file

     */

    struct Node {

        // Type of the node

        enum ET {

            LIGHT,

            CUBE,

            MESH,

            SKYBOX,

            DUMMY,

            CAMERA,

            TERRAIN,

            SPHERE,

            ANIMMESH

        } type;

        explicit Node(ET t) :

                type(t), scaling(1.0, 1.0, 1.0) // assume uniform scaling by default

                ,

                parent(),

                framesPerSecond(0.0),

                id(),

                sphereRadius(1.0),

                spherePolyCountX(100),

                spherePolyCountY(100) {

            // Generate a default name for the node

            char buffer[128];

            static int cnt;

            ai_snprintf(buffer, 128, "IrrNode_%i", cnt++);

            name = std::string(buffer);

            // reserve space for up to 5 materials

            materials.reserve(5);

            // reserve space for up to 5 children

            children.reserve(5);

        }

        // Transformation of the node

        aiVector3D position, rotation, scaling;

        // Name of the node

        std::string name;

        // List of all child nodes

        std::vector<std::unique_ptr<Node> > children;

        // Parent node

        Node *parent;

        // Animated meshes: frames per second

        // 0.f if not specified

        ai_real framesPerSecond;

        // Meshes: path to the mesh to be loaded

        std::string meshPath;

        unsigned int id;

        // Meshes: List of materials to be assigned

        // along with their corresponding material flags

        std::vector<std::pair<std::unique_ptr<aiMaterial>, unsigned int>> materials;

        // Spheres: radius of the sphere to be generates

        ai_real sphereRadius;

        // Spheres: Number of polygons in the x,y direction

        unsigned int spherePolyCountX, spherePolyCountY;

        // List of all animators assigned to the node

        std::list<Animator> animators;

    };

    /** Data structure for a vertex in an IRR skybox

     */

    struct SkyboxVertex {

        SkyboxVertex() = default;

        //! Construction from single vertex components

        SkyboxVertex(ai_real px, ai_real py, ai_real pz,

                ai_real nx, ai_real ny, ai_real nz,

                ai_real uvx, ai_real uvy)

                :

                position(px, py, pz), normal(nx, ny, nz), uv(uvx, uvy, 0.0) {}

        aiVector3D position, normal, uv;

    };

    // -------------------------------------------------------------------

    // Parse <node> tag from XML file and extract child node

    // @param node XML node

    // @param guessedMeshesContained number of extra guessed meshes

    std::unique_ptr<IRRImporter::Node> ParseNode(pugi::xml_node &node, BatchLoader& batch);

    // -------------------------------------------------------------------

    // Parse <attributes> tags within <node> tags and apply to scene node

    // @param attributeNode XML child node

    // @param nd Attributed scene node

    void ParseNodeAttributes(pugi::xml_node &attributeNode, IRRImporter::Node *nd, BatchLoader& batch);

    // -------------------------------------------------------------------

    // Parse an <animator> node and attach an animator to a node

    // @param animatorNode XML animator node

    // @param nd Animated scene node

    void ParseAnimators(pugi::xml_node &animatorNode, IRRImporter::Node *nd);

    // -------------------------------------------------------------------

    /// Fill the scene-graph recursively

    void GenerateGraph(Node *root, aiNode *rootOut, aiScene *scene,

            BatchLoader &batch,

            std::vector<aiMesh *> &meshes,

            std::vector<aiNodeAnim *> &anims,

            std::vector<AttachmentInfo> &attach,

            std::vector<std::unique_ptr<aiMaterial> > &materials,

            unsigned int &defaultMatIdx);

    // -------------------------------------------------------------------

    /// Generate a mesh that consists of just a single quad

    aiMesh *BuildSingleQuadMesh(const SkyboxVertex &v1,

            const SkyboxVertex &v2,

            const SkyboxVertex &v3,

            const SkyboxVertex &v4);

    // -------------------------------------------------------------------

    /// Build a sky-box

    ///

    /// @param meshes Receives 6 output meshes

    /// @param materials The last 6 materials are assigned to the newly

    ///                  created meshes. The names of the materials are adjusted.

    void BuildSkybox(std::vector<aiMesh *> &meshes,

                     std::vector<std::unique_ptr<aiMaterial> > &materials);

    // -------------------------------------------------------------------

    /** Copy a material for a mesh to the output material list

     *

     *  @param materials Receives an output material

     *  @param inmaterials List of input materials

     *  @param defMatIdx Default material index - UINT_MAX if not present

     *  @param mesh Mesh to work on

     */

    void CopyMaterial(std::vector<std::unique_ptr<aiMaterial> > &materials,

            std::vector<std::pair<std::unique_ptr<aiMaterial>, unsigned int>> &inmaterials,

            unsigned int &defMatIdx,

            aiMesh *mesh);

    // -------------------------------------------------------------------

    /** Compute animations for a specific node

     *

     *  @param root Node to be processed

     *  @param anims The list of output animations

     */

    void ComputeAnimations(Node *root, aiNode *real,

            std::vector<aiNodeAnim *> &anims);

private:

    /// Configuration option: desired output FPS

    double fps;

    /// Configuration option: speed flag was set?

    bool configSpeedFlag;

    std::vector<aiCamera*> cameras;

    std::vector<aiLight*> lights;

    unsigned int guessedMeshCnt;

    unsigned int guessedMatCnt;

    unsigned int guessedAnimCnt;

};

} // end of namespace Assimp

#endif // AI_IRRIMPORTER_H_INC