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|
/* SPDX-License-Identifier: GPL-2.0-or-later */
/** \file
* \ingroup obj
*/
#include "BLI_map.hh"
#include "BLI_string_ref.hh"
#include "BLI_vector.hh"
#include "IO_string_utils.hh"
#include "obj_import_file_reader.hh"
namespace blender::io::obj {
using std::string;
/**
* Based on the properties of the given Geometry instance, create a new Geometry instance
* or return the previous one.
*
* Also update index offsets which should always happen if a new Geometry instance is created.
*/
static Geometry *create_geometry(Geometry *const prev_geometry,
const eGeometryType new_type,
StringRef name,
const GlobalVertices &global_vertices,
Vector<std::unique_ptr<Geometry>> &r_all_geometries,
VertexIndexOffset &r_offset)
{
auto new_geometry = [&]() {
r_all_geometries.append(std::make_unique<Geometry>());
Geometry *g = r_all_geometries.last().get();
g->geom_type_ = new_type;
g->geometry_name_ = name.is_empty() ? "New object" : name;
g->vertex_start_ = global_vertices.vertices.size();
r_offset.set_index_offset(g->vertex_start_);
return g;
};
if (prev_geometry && prev_geometry->geom_type_ == GEOM_MESH) {
/* After the creation of a Geometry instance, at least one element has been found in the OBJ
* file that indicates that it is a mesh (basically anything but the vertex positions). */
if (!prev_geometry->face_elements_.is_empty() || prev_geometry->has_vertex_normals_ ||
!prev_geometry->edges_.is_empty()) {
return new_geometry();
}
if (new_type == GEOM_MESH) {
/* A Geometry created initially with a default name now found its name. */
prev_geometry->geometry_name_ = name;
return prev_geometry;
}
if (new_type == GEOM_CURVE) {
/* The object originally created is not a mesh now that curve data
* follows the vertex coordinates list. */
prev_geometry->geom_type_ = GEOM_CURVE;
return prev_geometry;
}
}
if (prev_geometry && prev_geometry->geom_type_ == GEOM_CURVE) {
return new_geometry();
}
return new_geometry();
}
static void geom_add_vertex(Geometry *geom,
const StringRef line,
GlobalVertices &r_global_vertices)
{
float3 vert;
parse_floats(line, FLT_MAX, vert, 3);
r_global_vertices.vertices.append(vert);
geom->vertex_count_++;
}
static void geom_add_vertex_normal(Geometry *geom,
const StringRef line,
GlobalVertices &r_global_vertices)
{
float3 normal;
parse_floats(line, FLT_MAX, normal, 3);
r_global_vertices.vertex_normals.append(normal);
geom->has_vertex_normals_ = true;
}
static void geom_add_uv_vertex(const StringRef line, GlobalVertices &r_global_vertices)
{
float2 uv;
parse_floats(line, FLT_MAX, uv, 2);
r_global_vertices.uv_vertices.append(uv);
}
static void geom_add_edge(Geometry *geom,
StringRef line,
const VertexIndexOffset &offsets,
GlobalVertices &r_global_vertices)
{
int edge_v1, edge_v2;
line = parse_int(line, -1, edge_v1);
line = parse_int(line, -1, edge_v2);
/* Always keep stored indices non-negative and zero-based. */
edge_v1 += edge_v1 < 0 ? r_global_vertices.vertices.size() : -offsets.get_index_offset() - 1;
edge_v2 += edge_v2 < 0 ? r_global_vertices.vertices.size() : -offsets.get_index_offset() - 1;
BLI_assert(edge_v1 >= 0 && edge_v2 >= 0);
geom->edges_.append({static_cast<uint>(edge_v1), static_cast<uint>(edge_v2)});
}
static void geom_add_polygon(Geometry *geom,
StringRef line,
const GlobalVertices &global_vertices,
const VertexIndexOffset &offsets,
const int material_index,
const int group_index,
const bool shaded_smooth)
{
PolyElem curr_face;
curr_face.shaded_smooth = shaded_smooth;
curr_face.material_index = material_index;
if (group_index >= 0) {
curr_face.vertex_group_index = group_index;
geom->use_vertex_groups_ = true;
}
const int orig_corners_size = geom->face_corners_.size();
curr_face.start_index_ = orig_corners_size;
bool face_valid = true;
while (!line.is_empty() && face_valid) {
PolyCorner corner;
bool got_uv = false, got_normal = false;
/* Parse vertex index. */
line = parse_int(line, INT32_MAX, corner.vert_index, false);
face_valid &= corner.vert_index != INT32_MAX;
if (!line.is_empty() && line[0] == '/') {
/* Parse UV index. */
line = line.drop_prefix(1);
if (!line.is_empty() && line[0] != '/') {
line = parse_int(line, INT32_MAX, corner.uv_vert_index, false);
got_uv = corner.uv_vert_index != INT32_MAX;
}
/* Parse normal index. */
if (!line.is_empty() && line[0] == '/') {
line = line.drop_prefix(1);
line = parse_int(line, INT32_MAX, corner.vertex_normal_index, false);
got_normal = corner.uv_vert_index != INT32_MAX;
}
}
/* Always keep stored indices non-negative and zero-based. */
corner.vert_index += corner.vert_index < 0 ? global_vertices.vertices.size() :
-offsets.get_index_offset() - 1;
if (corner.vert_index < 0 || corner.vert_index >= global_vertices.vertices.size()) {
fprintf(stderr,
"Invalid vertex index %i (valid range [0, %zu)), ignoring face\n",
corner.vert_index,
(size_t)global_vertices.vertices.size());
face_valid = false;
}
if (got_uv) {
corner.uv_vert_index += corner.uv_vert_index < 0 ? global_vertices.uv_vertices.size() : -1;
if (corner.uv_vert_index < 0 || corner.uv_vert_index >= global_vertices.uv_vertices.size()) {
fprintf(stderr,
"Invalid UV index %i (valid range [0, %zu)), ignoring face\n",
corner.uv_vert_index,
(size_t)global_vertices.uv_vertices.size());
face_valid = false;
}
}
if (got_normal) {
corner.vertex_normal_index += corner.vertex_normal_index < 0 ?
global_vertices.vertex_normals.size() :
-1;
if (corner.vertex_normal_index < 0 ||
corner.vertex_normal_index >= global_vertices.vertex_normals.size()) {
fprintf(stderr,
"Invalid normal index %i (valid range [0, %zu)), ignoring face\n",
corner.vertex_normal_index,
(size_t)global_vertices.vertex_normals.size());
face_valid = false;
}
}
geom->face_corners_.append(corner);
curr_face.corner_count_++;
/* Skip whitespace to get to the next face corner. */
line = drop_whitespace(line);
}
if (face_valid) {
geom->face_elements_.append(curr_face);
geom->total_loops_ += curr_face.corner_count_;
}
else {
/* Remove just-added corners for the invalid face. */
geom->face_corners_.resize(orig_corners_size);
geom->has_invalid_polys_ = true;
}
}
static Geometry *geom_set_curve_type(Geometry *geom,
const StringRef rest_line,
const GlobalVertices &global_vertices,
const StringRef group_name,
VertexIndexOffset &r_offsets,
Vector<std::unique_ptr<Geometry>> &r_all_geometries)
{
if (rest_line.find("bspline") == StringRef::not_found) {
std::cerr << "Curve type not supported:'" << rest_line << "'" << std::endl;
return geom;
}
geom = create_geometry(
geom, GEOM_CURVE, group_name, global_vertices, r_all_geometries, r_offsets);
geom->nurbs_element_.group_ = group_name;
return geom;
}
static void geom_set_curve_degree(Geometry *geom, const StringRef line)
{
parse_int(line, 3, geom->nurbs_element_.degree);
}
static void geom_add_curve_vertex_indices(Geometry *geom,
StringRef line,
const GlobalVertices &global_vertices)
{
/* Curve lines always have "0.0" and "1.0", skip over them. */
float dummy[2];
line = parse_floats(line, 0, dummy, 2);
/* Parse indices. */
while (!line.is_empty()) {
int index;
line = parse_int(line, INT32_MAX, index);
if (index == INT32_MAX) {
return;
}
/* Always keep stored indices non-negative and zero-based. */
index += index < 0 ? global_vertices.vertices.size() : -1;
geom->nurbs_element_.curv_indices.append(index);
}
}
static void geom_add_curve_parameters(Geometry *geom, StringRef line)
{
line = drop_whitespace(line);
if (line.is_empty()) {
std::cerr << "Invalid OBJ curve parm line: '" << line << "'" << std::endl;
return;
}
if (line[0] != 'u') {
std::cerr << "OBJ curve surfaces are not supported: '" << line[0] << "'" << std::endl;
return;
}
line = line.drop_prefix(1);
while (!line.is_empty()) {
float val;
line = parse_float(line, FLT_MAX, val);
if (val != FLT_MAX) {
geom->nurbs_element_.parm.append(val);
}
else {
std::cerr << "OBJ curve parm line has invalid number" << std::endl;
return;
}
}
}
static void geom_update_group(const StringRef rest_line, std::string &r_group_name)
{
if (rest_line.find("off") != string::npos || rest_line.find("null") != string::npos ||
rest_line.find("default") != string::npos) {
/* Set group for future elements like faces or curves to empty. */
r_group_name = "";
return;
}
r_group_name = rest_line;
}
static void geom_update_smooth_group(StringRef line, bool &r_state_shaded_smooth)
{
line = drop_whitespace(line);
/* Some implementations use "0" and "null" too, in addition to "off". */
if (line == "0" || line.startswith("off") || line.startswith("null")) {
r_state_shaded_smooth = false;
return;
}
int smooth = 0;
parse_int(line, 0, smooth);
r_state_shaded_smooth = smooth != 0;
}
OBJParser::OBJParser(const OBJImportParams &import_params, size_t read_buffer_size = 64 * 1024)
: import_params_(import_params), read_buffer_size_(read_buffer_size)
{
obj_file_ = BLI_fopen(import_params_.filepath, "rb");
if (!obj_file_) {
fprintf(stderr, "Cannot read from OBJ file:'%s'.\n", import_params_.filepath);
return;
}
}
OBJParser::~OBJParser()
{
if (obj_file_) {
fclose(obj_file_);
}
}
/* If line starts with keyword followed by whitespace, returns true and drops it from the line. */
static bool parse_keyword(StringRef &line, StringRef keyword)
{
const size_t keyword_len = keyword.size();
if (line.size() < keyword_len + 1) {
return false;
}
if (!line.startswith(keyword)) {
return false;
}
/* Treat any ASCII control character as whitespace; don't use isspace() for performance reasons.
*/
if (line[keyword_len] > ' ') {
return false;
}
line = line.drop_prefix(keyword_len + 1);
return true;
}
void OBJParser::parse(Vector<std::unique_ptr<Geometry>> &r_all_geometries,
GlobalVertices &r_global_vertices)
{
if (!obj_file_) {
return;
}
VertexIndexOffset offsets;
Geometry *curr_geom = create_geometry(
nullptr, GEOM_MESH, "", r_global_vertices, r_all_geometries, offsets);
/* State variables: once set, they remain the same for the remaining
* elements in the object. */
bool state_shaded_smooth = false;
string state_group_name;
int state_group_index = -1;
string state_material_name;
int state_material_index = -1;
/* Read the input file in chunks. We need up to twice the possible chunk size,
* to possibly store remainder of the previous input line that got broken mid-chunk. */
Array<char> buffer(read_buffer_size_ * 2);
size_t buffer_offset = 0;
size_t line_number = 0;
while (true) {
/* Read a chunk of input from the file. */
size_t bytes_read = fread(buffer.data() + buffer_offset, 1, read_buffer_size_, obj_file_);
if (bytes_read == 0 && buffer_offset == 0) {
break; /* No more data to read. */
}
/* Ensure buffer ends in a newline. */
if (bytes_read < read_buffer_size_) {
if (bytes_read == 0 || buffer[buffer_offset + bytes_read - 1] != '\n') {
buffer[buffer_offset + bytes_read] = '\n';
bytes_read++;
}
}
size_t buffer_end = buffer_offset + bytes_read;
if (buffer_end == 0) {
break;
}
/* Find last newline. */
size_t last_nl = buffer_end;
while (last_nl > 0) {
--last_nl;
if (buffer[last_nl] == '\n') {
if (last_nl < 1 || buffer[last_nl - 1] != '\\') {
break;
}
}
}
if (buffer[last_nl] != '\n') {
/* Whole line did not fit into our read buffer. Warn and exit. */
fprintf(stderr,
"OBJ file contains a line #%zu that is too long (max. length %zu)\n",
line_number,
read_buffer_size_);
break;
}
++last_nl;
/* Parse the buffer (until last newline) that we have so far,
* line by line. */
StringRef buffer_str{buffer.data(), (int64_t)last_nl};
while (!buffer_str.is_empty()) {
StringRef line = read_next_line(buffer_str);
++line_number;
if (line.is_empty()) {
continue;
}
/* Most common things that start with 'v': vertices, normals, UVs. */
if (line[0] == 'v') {
if (parse_keyword(line, "v")) {
geom_add_vertex(curr_geom, line, r_global_vertices);
}
else if (parse_keyword(line, "vn")) {
geom_add_vertex_normal(curr_geom, line, r_global_vertices);
}
else if (parse_keyword(line, "vt")) {
geom_add_uv_vertex(line, r_global_vertices);
}
}
/* Faces. */
else if (parse_keyword(line, "f")) {
geom_add_polygon(curr_geom,
line,
r_global_vertices,
offsets,
state_material_index,
state_group_index, /* TODO was wrongly material name! */
state_shaded_smooth);
}
/* Faces. */
else if (parse_keyword(line, "l")) {
geom_add_edge(curr_geom, line, offsets, r_global_vertices);
}
/* Objects. */
else if (parse_keyword(line, "o")) {
state_shaded_smooth = false;
state_group_name = "";
state_material_name = "";
curr_geom = create_geometry(
curr_geom, GEOM_MESH, line.trim(), r_global_vertices, r_all_geometries, offsets);
}
/* Groups. */
else if (parse_keyword(line, "g")) {
geom_update_group(line.trim(), state_group_name);
int new_index = curr_geom->group_indices_.size();
state_group_index = curr_geom->group_indices_.lookup_or_add(state_group_name, new_index);
if (new_index == state_group_index) {
curr_geom->group_order_.append(state_group_name);
}
}
/* Smoothing groups. */
else if (parse_keyword(line, "s")) {
geom_update_smooth_group(line, state_shaded_smooth);
}
/* Materials and their libraries. */
else if (parse_keyword(line, "usemtl")) {
state_material_name = line.trim();
int new_mat_index = curr_geom->material_indices_.size();
state_material_index = curr_geom->material_indices_.lookup_or_add(state_material_name,
new_mat_index);
if (new_mat_index == state_material_index) {
curr_geom->material_order_.append(state_material_name);
}
}
else if (parse_keyword(line, "mtllib")) {
mtl_libraries_.append(line.trim());
}
/* Comments. */
else if (line.startswith("#")) {
/* Nothing to do. */
}
/* Curve related things. */
else if (parse_keyword(line, "cstype")) {
curr_geom = geom_set_curve_type(
curr_geom, line, r_global_vertices, state_group_name, offsets, r_all_geometries);
}
else if (parse_keyword(line, "deg")) {
geom_set_curve_degree(curr_geom, line);
}
else if (parse_keyword(line, "curv")) {
geom_add_curve_vertex_indices(curr_geom, line, r_global_vertices);
}
else if (parse_keyword(line, "parm")) {
geom_add_curve_parameters(curr_geom, line);
}
else if (line.startswith("end")) {
/* End of curve definition, nothing else to do. */
}
else if (line.front() <= ' ') {
/* Just whitespace, skip. */
}
else {
std::cout << "OBJ element not recognized: '" << line << "'" << std::endl;
}
}
/* We might have a line that was cut in the middle by the previous buffer;
* copy it over for next chunk reading. */
size_t left_size = buffer_end - last_nl;
memmove(buffer.data(), buffer.data() + last_nl, left_size);
buffer_offset = left_size;
}
}
static eMTLSyntaxElement mtl_line_start_to_enum(StringRef &line)
{
if (parse_keyword(line, "map_Kd")) {
return eMTLSyntaxElement::map_Kd;
}
if (parse_keyword(line, "map_Ks")) {
return eMTLSyntaxElement::map_Ks;
}
if (parse_keyword(line, "map_Ns")) {
return eMTLSyntaxElement::map_Ns;
}
if (parse_keyword(line, "map_d")) {
return eMTLSyntaxElement::map_d;
}
if (parse_keyword(line, "refl")) {
return eMTLSyntaxElement::map_refl;
}
if (parse_keyword(line, "map_refl")) {
return eMTLSyntaxElement::map_refl;
}
if (parse_keyword(line, "map_Ke")) {
return eMTLSyntaxElement::map_Ke;
}
if (parse_keyword(line, "bump")) {
return eMTLSyntaxElement::map_Bump;
}
if (parse_keyword(line, "map_Bump") || parse_keyword(line, "map_bump")) {
return eMTLSyntaxElement::map_Bump;
}
return eMTLSyntaxElement::string;
}
static const std::pair<StringRef, int> unsupported_texture_options[] = {
{"-blendu", 1},
{"-blendv", 1},
{"-boost", 1},
{"-cc", 1},
{"-clamp", 1},
{"-imfchan", 1},
{"-mm", 2},
{"-t", 3},
{"-texres", 1},
};
static bool parse_texture_option(StringRef &line, MTLMaterial *material, tex_map_XX &tex_map)
{
line = drop_whitespace(line);
if (parse_keyword(line, "-o")) {
line = parse_floats(line, 0.0f, tex_map.translation, 3);
return true;
}
if (parse_keyword(line, "-s")) {
line = parse_floats(line, 1.0f, tex_map.scale, 3);
return true;
}
if (parse_keyword(line, "-bm")) {
line = parse_float(line, 0.0f, material->map_Bump_strength);
return true;
}
if (parse_keyword(line, "-type")) {
line = drop_whitespace(line);
/* Only sphere is supported. */
tex_map.projection_type = SHD_PROJ_SPHERE;
if (!line.startswith("sphere")) {
std::cerr << "OBJ import: only sphere MTL projection type is supported: '" << line << "'"
<< std::endl;
}
line = drop_non_whitespace(line);
return true;
}
/* Check for unsupported options and skip them. */
for (const auto &opt : unsupported_texture_options) {
if (parse_keyword(line, opt.first)) {
/* Drop the arguments. */
for (int i = 0; i < opt.second; ++i) {
line = drop_whitespace(line);
line = drop_non_whitespace(line);
}
return true;
}
}
return false;
}
static void parse_texture_map(StringRef line, MTLMaterial *material, const char *mtl_dir_path)
{
bool is_map = line.startswith("map_");
bool is_refl = line.startswith("refl");
bool is_bump = line.startswith("bump");
if (!is_map && !is_refl && !is_bump) {
return;
}
eMTLSyntaxElement key = mtl_line_start_to_enum(line);
if (key == eMTLSyntaxElement::string || !material->texture_maps.contains(key)) {
/* No supported texture map found. */
std::cerr << "OBJ import: MTL texture map type not supported: '" << line << "'" << std::endl;
return;
}
tex_map_XX &tex_map = material->texture_maps.lookup(key);
tex_map.mtl_dir_path = mtl_dir_path;
/* Parse texture map options. */
while (parse_texture_option(line, material, tex_map)) {
}
/* What remains is the image path. */
line = line.trim();
tex_map.image_path = line;
}
Span<std::string> OBJParser::mtl_libraries() const
{
return mtl_libraries_;
}
MTLParser::MTLParser(StringRef mtl_library, StringRefNull obj_filepath)
{
char obj_file_dir[FILE_MAXDIR];
BLI_split_dir_part(obj_filepath.data(), obj_file_dir, FILE_MAXDIR);
BLI_path_join(mtl_file_path_, FILE_MAX, obj_file_dir, mtl_library.data(), NULL);
BLI_split_dir_part(mtl_file_path_, mtl_dir_path_, FILE_MAXDIR);
}
void MTLParser::parse_and_store(Map<string, std::unique_ptr<MTLMaterial>> &r_materials)
{
size_t buffer_len;
void *buffer = BLI_file_read_text_as_mem(mtl_file_path_, 0, &buffer_len);
if (buffer == nullptr) {
fprintf(stderr, "OBJ import: cannot read from MTL file: '%s'\n", mtl_file_path_);
return;
}
MTLMaterial *material = nullptr;
StringRef buffer_str{(const char *)buffer, (int64_t)buffer_len};
while (!buffer_str.is_empty()) {
StringRef line = read_next_line(buffer_str);
line = drop_whitespace(line);
if (line.is_empty()) {
continue;
}
if (parse_keyword(line, "newmtl")) {
line = line.trim();
if (r_materials.remove_as(line)) {
std::cerr << "Duplicate material found:'" << line
<< "', using the last encountered Material definition." << std::endl;
}
material = r_materials.lookup_or_add(string(line), std::make_unique<MTLMaterial>()).get();
}
else if (material != nullptr) {
if (parse_keyword(line, "Ns")) {
parse_float(line, 324.0f, material->Ns);
}
else if (parse_keyword(line, "Ka")) {
parse_floats(line, 0.0f, material->Ka, 3);
}
else if (parse_keyword(line, "Kd")) {
parse_floats(line, 0.8f, material->Kd, 3);
}
else if (parse_keyword(line, "Ks")) {
parse_floats(line, 0.5f, material->Ks, 3);
}
else if (parse_keyword(line, "Ke")) {
parse_floats(line, 0.0f, material->Ke, 3);
}
else if (parse_keyword(line, "Ni")) {
parse_float(line, 1.45f, material->Ni);
}
else if (parse_keyword(line, "d")) {
parse_float(line, 1.0f, material->d);
}
else if (parse_keyword(line, "illum")) {
parse_int(line, 2, material->illum);
}
else {
parse_texture_map(line, material, mtl_dir_path_);
}
}
}
MEM_freeN(buffer);
}
} // namespace blender::io::obj
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