NvBlastExtExporterFbxReader.h

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#ifndef NVBLASTEXTEXPORTERFBXREADER_H
#define NVBLASTEXTEXPORTERFBXREADER_H

#include <memory>
#include "fbxsdk.h"
#include <vector>
#include <map>
#include "NvBlastExtExporter.h"
#include "NvBlastExtAuthoringTypes.h"

namespace Nv
{
namespace Blast
{
class Mesh;

class FbxFileReader : public IFbxFileReader
{
    struct CollisionHullImpl : public Nv::Blast::CollisionHull
    {
        //copy from existing
        CollisionHullImpl(const CollisionHullImpl& other) : CollisionHullImpl()
        {
            copyFrom(other);
        }

        CollisionHullImpl()
        {
            pointsCount = 0;
            indicesCount = 0;
            polygonDataCount = 0;
            points = nullptr;
            indices = nullptr;
            polygonData = nullptr;
        }

        CollisionHullImpl(CollisionHullImpl&& other)
        {
            operator=(std::move(other));
        }

        CollisionHullImpl& operator=(const CollisionHullImpl& other)
        {
            if (&other != this)
            {
                delete[] points;
                delete[] indices;
                delete[] polygonData;
                copyFrom(other);
            }
            return *this;
        }

        CollisionHullImpl& operator=(CollisionHullImpl&& other)
        {
            if (&other != this)
            {
                pointsCount = other.pointsCount;
                indicesCount = other.indicesCount;
                polygonDataCount = other.polygonDataCount;
                points = other.points;
                indices = other.indices;
                polygonData = other.polygonData;

                other.pointsCount = 0;
                other.indicesCount = 0;
                other.polygonDataCount = 0;
                other.points = nullptr;
                other.indices = nullptr;
                other.polygonData = nullptr;
            }
            return *this;
        }

        virtual ~CollisionHullImpl()
        {
            delete[] points;
            delete[] indices;
            delete[] polygonData;
        }
    private:

        void copyFrom(const CollisionHullImpl& other)
        {
            pointsCount = other.pointsCount;
            indicesCount = other.indicesCount;
            polygonDataCount = other.polygonDataCount;
            points = new NvcVec3[pointsCount];
            indices = new uint32_t[indicesCount];
            polygonData = new Nv::Blast::HullPolygon[polygonDataCount];
            memcpy(points, other.points, sizeof(points[0]) * pointsCount);
            memcpy(indices, other.indices, sizeof(indices[0]) * indicesCount);
            memcpy(polygonData, other.polygonData, sizeof(polygonData[0]) * polygonDataCount);
        }
    };

public:
    FbxFileReader();
    ~FbxFileReader() = default;

    virtual void release() override;

    /*
    Load from the specified file path, returning a mesh or nullptr if failed
    */
    virtual void loadFromFile(const char* filename) override;

    virtual uint32_t getVerticesCount() const override
    {
        return mVertexPositions.size();
    }

    virtual uint32_t getIndicesCount() const override
    {
        return mIndices.size();
    }

    virtual bool isCollisionLoaded() override;

    virtual uint32_t getCollision(uint32_t*& hullsOffset, Nv::Blast::CollisionHull**& hulls) override;

    virtual uint32_t getBoneInfluences(uint32_t*& out) override;

    virtual uint32_t getBoneCount() override;

    virtual NvcVec3* getPositionArray() override;
    virtual NvcVec3* getNormalsArray() override;
    virtual NvcVec2* getUvArray() override;
    virtual uint32_t* getIndexArray() override;

    int32_t*        getMaterialIds() override;

    int32_t*        getSmoothingGroups() override;

    const char*     getMaterialName(int32_t id) override;


    int32_t         getMaterialCount() override;

private:

    uint32_t mMeshCount;
    uint32_t mChunkCount;
    std::vector<uint32_t> mHullsOffset;
    std::vector<CollisionHullImpl> mHulls;
    std::vector<uint32_t> mVertexToContainingChunkMap;
    std::multimap<uint32_t, FbxNode*> mCollisionNodes;
    std::vector<NvcVec3> mVertexPositions;
    std::vector<NvcVec3> mVertexNormals;
    std::vector<NvcVec2> mVertexUv;
    std::vector<uint32_t> mIndices;
    std::vector<int32_t> mSmoothingGroups;
    std::vector<int32_t> mMaterialIds;
    std::vector<std::string> mMaterialNames;    
    
    FbxAMatrix getTransformForNode(FbxNode* node);
    void getFbxMeshes(FbxDisplayLayer* collisionDisplayLayer, FbxNode* node, std::vector<FbxNode*>& meshNodes);
    bool getCollisionInternal();
    bool getBoneInfluencesInternal(FbxMesh* meshNode);

};

}
}

#endif