ObjectLoader.h

// Copyright(c) 2019 - 2020, #Momo
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#pragma once

#include <sstream>

#include "Utilities/Math/Math.h"
#include "Core/BoundingObjects/AABB.h"
#include "Utilities/STL/MxHashMap.h"
#include "Utilities/STL/MxString.h"
#include "Utilities/STL/MxVector.h"
#include "Core/Resources/MeshData.h"

namespace MxEngine
{
    struct MaterialInfo
    {
        MxString Name;

        MxString AmbientMap;
        MxString DiffuseMap;
        MxString SpecularMap;
        MxString EmmisiveMap;
        MxString HeightMap;
        MxString NormalMap;

        float SpecularExponent = 0.0f;
        float Transparency = 0.0f;
        float Displacement = 0.0f;
        
        Vector3 AmbientColor{ 0.0f };
        Vector3 DiffuseColor{ 0.0f };
        Vector3 SpecularColor{ 0.0f };
        Vector3 EmmisiveColor{ 0.0f };
    };

    struct MeshInfo
    {
        MxString name;
        MxVector<Vertex> vertecies;
        /*
        face indicies to access buffer of verteces
        */
        MxVector<uint32_t> indicies;        
        MaterialInfo* material = nullptr;
        bool useTexture = false;
        bool useNormal = false;

        size_t GetVertexCount() const { return this->vertecies.size(); }
    };

    using MaterialLibrary = MxVector<MaterialInfo>;

    struct ObjectInfo
    {
        MaterialLibrary materials;
        MxVector<MeshInfo> meshes;
    };

    class ObjectLoader
    {
    public:
        /*
        loads object from disk by its file path
        \param path absoulute or relative to executable folder path to a file to load
        \returns ObjectInfo instance
        \warning this function is not thread safe
        */
        static ObjectInfo Load(const MxString& path);
        static MaterialLibrary LoadMaterials(const MxString& path);
        static void DumpMaterials(const MaterialLibrary& materials, const MxString& path);
    };
}