ObjWriter.hpp

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//
//  CeresEngine - A game development framework
//
//  Created by Rogiel Sulzbach.
//  Copyright (c) 2018-2022 Rogiel Sulzbach. All rights reserved.
//
 
#pragma once
 
#include "MeshVertex.hpp"
#include "Triangle.hpp"
 
#include <sstream>
 
namespace CeresEngine::MeshGenerator {
 
    class ObjWriter {
    public:
        ObjWriter();
 
        template<typename Mesh> void writeMesh(const Mesh& mesh) {
            int newBase = mBase;
 
            for(const MeshVertex& vertex : mesh.vertices()) {
                ++newBase;
 
                ss_ << "v " << vertex.position[0] << " " << vertex.position[1] << " " << vertex.position[2] << "\n";
 
                ss_ << "vn " << vertex.normal[0] << " " << vertex.normal[1] << " " << vertex.normal[2] << "\n";
 
                ss_ << "vt " << vertex.texCoord[0] << " " << vertex.texCoord[1] << "\n";
            }
 
            for(const Triangle& triangle : mesh.triangles()) {
                auto t = triangle.vertices + mBase;
                ss_ << "f " << t[0] << "/" << t[0] << "/" << t[0] << " " << t[1] << "/" << t[1] << "/" << t[1] << " " << t[2] << "/" << t[2] << "/" << t[2]
                    << "\n";
            }
 
            mBase = newBase;
        }
 
        std::string str() { return ss_.str(); }
 
    private:
        int mBase;
 
        std::stringstream ss_;
    };
 
} // namespace CeresEngine::MeshGenerator