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60 lines
2.1 KiB
C++
60 lines
2.1 KiB
C++
/*
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* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
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* Copyright (c) 2021, Mathieu Gaillard <gaillard.mathieu.39@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "WavefrontOBJLoader.h"
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#include <LibCore/File.h>
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#include <stdlib.h>
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RefPtr<Mesh> WavefrontOBJLoader::load(const String& fname)
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{
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auto obj_file_or_error = Core::File::open(fname, Core::OpenMode::ReadOnly);
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Vector<Vertex> vertices;
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Vector<Triangle> triangles;
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dbgln("Wavefront: Loading {}...", fname);
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if (obj_file_or_error.is_error())
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return nullptr;
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// Start reading file line by line
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for (auto line = obj_file_or_error.value()->line_begin(); !line.at_end(); ++line) {
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auto object_line = *line;
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// This line describes a vertex (a position in 3D space)
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if (object_line.starts_with("v")) {
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auto vertex_line = object_line.split_view(' ');
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if (vertex_line.size() != 4) {
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dbgln("Wavefront: Malformed vertex line. Aborting.");
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return nullptr;
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}
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vertices.append(
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{ static_cast<GLfloat>(atof(String(vertex_line.at(1)).characters())),
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static_cast<GLfloat>(atof(String(vertex_line.at(2)).characters())),
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static_cast<GLfloat>(atof(String(vertex_line.at(3)).characters())) });
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}
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// This line describes a face (a collection of 3 vertices, aka a triangle)
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else if (object_line.starts_with("f")) {
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auto face_line = object_line.split_view(' ');
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if (face_line.size() != 4) {
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dbgln("Wavefront: Malformed face line. Aborting.");
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return nullptr;
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}
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// Create a new triangle
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triangles.append(
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{
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face_line.at(1).to_uint().value() - 1,
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face_line.at(2).to_uint().value() - 1,
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face_line.at(3).to_uint().value() - 1,
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});
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}
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}
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dbgln("Wavefront: Done.");
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return adopt_ref(*new Mesh(vertices, triangles));
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}
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