OBJLoader.hpp

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/**************************************************************************
 * EngineSquared v0.1.1
 *
 * EngineSquared is a software package, part of the Engine² organization.
 *
 * This file is part of the EngineSquared project that is under MIT License.
 * Copyright © 2025-present by @EngineSquared, All rights reserved.
 *
 * EngineSquared is a free software: you can redistribute it and/or modify
 * it under the terms of the MIT License. See the project's LICENSE file for
 * the full license text and details.
 *
 * @file OBJLoader.hpp
 * @brief OBJLoader class declaration.
 *
 * This class is used to load and parse OBJ files.
 *
 * @author @EngineSquared
 * @version 0.1.1
 * @date 2025-10-03
 **************************************************************************/
 
#pragma once
#include <string>
#include <tiny_obj_loader.h>
 
#include "component/Material.hpp"
#include "component/Mesh.hpp"
#include "exception/OBJLoaderError.hpp"
#include "resource/Shape.hpp"
 
namespace Object {

class OBJLoader {
  public:
    explicit OBJLoader(const std::string &filepath, const std::string &mtlSearchPath = "");
    ~OBJLoader() = default;

    [[nodiscard]] Component::Mesh GetMesh();

    [[nodiscard]] std::vector<Resource::Shape> GetShapes();

    [[nodiscard]] std::vector<Component::Material> GetMaterials();
 
  private:
    void ProcessMeshFace(Component::Mesh &mesh, const std::vector<tinyobj::shape_t> &shapes, size_t shape,
                         size_t face_vertices, size_t &index_offset) noexcept;

    void SetMaterialProperties(Component::Material &material, const tinyobj::material_t &mat) noexcept;
 
  protected:
  private:
    tinyobj::ObjReaderConfig _reader_config;
    tinyobj::ObjReader _reader;
    Component::Mesh _mesh{};
    std::vector<Resource::Shape> _shapes{};
    std::vector<Component::Material> _materials{};
};
 
} // namespace Object