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/*
* Copyright (c) 2021, Jesse Buhagiar <jooster669@gmail.com>
* Copyright (c) 2021, Mathieu Gaillard <gaillard.mathieu.39@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "WavefrontOBJLoader.h"
#include <LibCore/File.h>
#include <stdlib.h>
RefPtr<Mesh> WavefrontOBJLoader::load(Core::File& file)
{
Vector<Vertex> vertices;
Vector<TexCoord> tex_coords;
Vector<Triangle> triangles;
dbgln("Wavefront: Loading {}...", file.name());
// Start reading file line by line
for (auto line = file.line_begin(); !line.at_end(); ++line) {
auto object_line = *line;
// Ignore file comments
if (object_line.starts_with("#"))
continue;
if (object_line.starts_with("vt")) {
auto tex_coord_line = object_line.split_view(' ');
if (tex_coord_line.size() != 3) {
dbgln("Wavefront: Malformed TexCoord line. Aborting.");
dbgln("{}", object_line);
return nullptr;
}
tex_coords.append({ static_cast<GLfloat>(atof(String(tex_coord_line.at(1)).characters())),
static_cast<GLfloat>(atof(String(tex_coord_line.at(2)).characters())) });
continue;
}
// FIXME: Parse texture coordinates and vertex normals
if (object_line.starts_with("vn")) {
continue;
}
// This line describes a vertex (a position in 3D space)
if (object_line.starts_with("v")) {
auto vertex_line = object_line.split_view(' ');
if (vertex_line.size() != 4) {
dbgln("Wavefront: Malformed vertex line. Aborting.");
return nullptr;
}
vertices.append({ static_cast<GLfloat>(atof(String(vertex_line.at(1)).characters())),
static_cast<GLfloat>(atof(String(vertex_line.at(2)).characters())),
static_cast<GLfloat>(atof(String(vertex_line.at(3)).characters())) });
}
// This line describes a face (a collection of 3 vertices, aka a triangle)
else if (object_line.starts_with("f")) {
auto face_line = object_line.split_view(' ');
if (face_line.size() != 4) {
dbgln("Wavefront: Malformed face line. Aborting.");
return nullptr;
}
GLuint vert_index[3];
GLuint tex_coord_index[3];
if (object_line.contains("/")) {
for (int i = 1; i <= 3; ++i) {
vert_index[i - 1] = face_line.at(i).split_view("/").at(0).to_uint().value_or(1);
tex_coord_index[i - 1] = face_line.at(i).split_view("/").at(1).to_uint().value_or(1);
}
} else {
vert_index[0] = (face_line.at(1).to_uint().value_or(1));
vert_index[1] = (face_line.at(2).to_uint().value_or(1));
vert_index[2] = (face_line.at(3).to_uint().value_or(1));
tex_coord_index[0] = 0;
tex_coord_index[1] = 0;
tex_coord_index[2] = 0;
}
// Create a new triangle
triangles.append(
{ vert_index[0] - 1,
vert_index[1] - 1,
vert_index[2] - 1,
tex_coord_index[0] - 1,
tex_coord_index[1] - 1,
tex_coord_index[2] - 1 });
}
}
if (vertices.is_empty()) {
dbgln("Wavefront: Failed to read any data from 3D file: {}", file.name());
return nullptr;
}
dbgln("Wavefront: Done.");
return adopt_ref(*new Mesh(vertices, tex_coords, triangles));
}
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