562 lines
13 KiB
C++
Executable File
562 lines
13 KiB
C++
Executable File
#include "../../../include/assets/data_parsers"
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#include <charconv>
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#include <fstream>
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#include <array>
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#include "assets/components/mesh_vertex_components.hpp"
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#include "../../../include/assets/data_loaders"
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#include "util/logger.hpp"
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#include "util/for_each.hpp"
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#include "util/uix.hpp"
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#include <set>
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#include "util/line_parser.hpp"
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namespace obj_loader_error
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{
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struct category : std::error_category
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{
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[[nodiscard]] const char* name() const noexcept override {
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return "obj_loader";
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}
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[[nodiscard]] std::string message(int ev) const override
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{
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switch (static_cast<codes>(ev))
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{
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using enum codes;
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case cannot_open_file:
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return "Cannot open given obj file.";
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case malformed_vertex:
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return "File contains malformed 'v' statement.";
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case malformed_texture_coordinate:
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return "File contains malformed 'vt' statement.";
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case malformed_normal:
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return "File contains malformed 'vn' statement.";
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case malformed_face:
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return "File contains malformed 'f' statement.";
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case face_index_out_of_range:
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return "Face index out of range.";
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case unknown_line_begin:
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return "Unknown obj line begin.";
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case use_material_without_material_library:
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return "'usemtl' statement before material library loaded.";
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case unknown_material_name:
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return "No matching material name found in material library.";
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default:
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using namespace std::string_literals;
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return "unrecognized error ("s + std::to_string(ev) + ")";
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}
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}
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};
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} // namespace mesh_loader_error
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inline std::error_category& connector_error_category()
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{
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static obj_loader_error::category category;
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return category;
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}
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namespace obj_loader_error
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{
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inline std::error_code make_error_code(codes e)
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{
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return { static_cast<int>(e), connector_error_category() };
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}
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} // namespace mesh_loader_error
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template<typename T, std::size_t Count>
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std::errc parse_numeric_vector(std::string_view param, std::array<T, Count>& values)
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{
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auto it = param.begin();
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const auto end = param.end();
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for (auto& value : values)
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{
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if (it >= end)
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{
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return std::errc::invalid_argument;
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}
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const auto [ptr, ec] = std::from_chars(it, end, value);
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if (ec != std::errc{})
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{
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return ec;
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}
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it = ptr + 1; // Skip space in between components.
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}
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return {};
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};
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void obj_loader::find_materials(
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std::span<char> buffer,
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std::filesystem::path& path_buffer,
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const std::filesystem::path& base_directory,
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std::ifstream& in,
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ztu::string_list& material_filenames
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) {
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static constexpr auto keyword = std::string_view{ "\nmtllib " };
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const auto buffer_view = std::string_view(buffer);
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// Add linebreak to simplify line begin search.
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buffer.front() = '\n';
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auto leftover = std::size_t{ 1 };
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do
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{
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// Keep some old characters to continue matching interrupted sequence.
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std::copy(buffer.end() - leftover, buffer.end(), buffer.begin());
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in.read(buffer.data() + leftover, buffer.size() - leftover);
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const auto str = buffer_view.substr(0, leftover + in.gcount());
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leftover = keyword.size();
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auto pos = std::string_view::size_type{};
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while ((pos = str.find(keyword, pos)) != std::string_view::npos)
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{
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const auto filename_begin = pos + keyword.size();
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const auto filename_end = str.find('\n', filename_begin);
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if (filename_end != std::string_view::npos)
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{
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const auto length = filename_end - filename_begin;
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const auto filename = str.substr(filename_begin, length);
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path_buffer.assign(filename);
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if (path_buffer.is_relative())
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{
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path_buffer = base_directory;
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path_buffer /= filename;
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}
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material_filenames.push_back(path_buffer.c_str());
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pos = filename_end;
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}
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else // String match exceeds buffer.
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{
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if (pos == 0) [[unlikely]]
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{
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ztu::logger::error("Ignoring string match, as it exceeds buffer size of % characters.", buffer.size());
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leftover = 0;
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}
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else
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{
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leftover = str.size() - pos;
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}
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break;
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}
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}
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} while (not in.eof());
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}
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std::error_code obj_loader::prefetch(
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const file_dir_list& paths,
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prefetch_queue& queue
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) {
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namespace fs = std::filesystem;
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using obj_loader_error::codes;
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using obj_loader_error::make_error_code;
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auto buffer = std::vector<char>(8 * 1024, '\0');
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auto in = std::ifstream{};
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auto path_buffer = fs::path{};
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auto filename_buffer = fs::path{};
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const auto process_file = [&]()
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{
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in.open(filename_buffer);
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if (not in.is_open()) {
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ztu::logger::error("Could not open .obj file '%'", filename_buffer);
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return;
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}
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filename_buffer.remove_filename();
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find_materials(buffer, path_buffer, filename_buffer, in, queue.mtl_queue.files);
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in.close();
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};
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for (const auto file : paths.files)
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{
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filename_buffer.assign(file);
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process_file();
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}
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for (const auto directory : paths.directories)
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{
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for (const auto& file : fs::directory_iterator{ directory }) {
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filename_buffer.assign(file.path());
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// Avoid heap allocation of .extension()
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if (not std::string_view(filename_buffer.c_str()).ends_with(".obj"))
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{
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continue;
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}
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process_file();
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}
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}
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return {};
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}
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std::error_code obj_loader::load(
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dynamic_mesh_buffer& buffer,
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const file_dir_list& paths,
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prefetch_lookup& id_lookup,
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dynamic_shader_source_store& store,
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bool pedantic
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) {
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namespace fs = std::filesystem;
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auto position_buffer = buffer.positions();
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auto normal_buffer = buffer.normals();
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auto tex_coord_buffer = buffer.tex_coords();
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auto read_buffer = dynamic_mesh_buffer{};
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auto path_buffer = fs::path{};
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auto vertex_ids = std::set<indexed_vertex_type>{};
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auto in = std::ifstream{};
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auto filename_buffer = fs::path{};
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const auto process_file = [&]()
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{
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in.open(filename_buffer);
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if (not in.is_open()) {
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ztu::logger::error("Could not open .obj file '%'", filename_buffer);
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return;
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}
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filename_buffer.remove_filename();
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// parse file
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const auto error = parse_file(
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read_buffer,
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buffer,
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path_buffer,
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filename_buffer,
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vertex_ids,
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in,
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id_lookup,
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store,
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pedantic
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);
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if (error)
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{
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ztu::logger::error(
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"Error occurred while parsing .obj file: [%] %",
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error.category().name(),
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error.message()
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);
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}
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in.close();
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};
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for (const auto file : paths.files)
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{
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filename_buffer.assign(file);
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process_file();
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}
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for (const auto directory : paths.directories)
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{
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for (const auto& file : fs::directory_iterator{ directory }) {
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filename_buffer.assign(file.path());
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// Avoid heap allocation of .extension()
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if (not std::string_view(filename_buffer.c_str()).ends_with(".obj"))
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{
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continue;
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}
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process_file();
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}
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}
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return {};
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}
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std::error_code obj_loader::parse_file(
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dynamic_mesh_buffer& read_buffer,
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dynamic_mesh_buffer& mesh_buffer,
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std::filesystem::path& path_buffer,
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const std::filesystem::path& base_directory,
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std::set<indexed_vertex_type>& vertex_ids,
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std::ifstream& in,
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prefetch_lookup& id_lookup,
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dynamic_shader_source_store& store,
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bool pedantic
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) {
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using obj_loader_error::codes;
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using obj_loader_error::make_error_code;
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read_buffer.clear();
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mesh_buffer.clear();
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vertex_ids.clear();
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// Buffers for storing the vertex component definitions.
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auto& position_buffer = read_buffer.positions();
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auto& normal_buffer = read_buffer.normals();
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auto& tex_coord_buffer = read_buffer.tex_coords();
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auto& positions = mesh_buffer.positions();
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auto& normals = mesh_buffer.normals();
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auto& tex_coords = mesh_buffer.tex_coords();
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auto& triangles = mesh_buffer.triangles();
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const auto push_mesh = [&](const bool clear_read_buffer = false)
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{
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if (not triangles.empty())
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{
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ztu::logger::debug("Parsed % positions.", positions.size());
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ztu::logger::debug("Parsed % normals.", normals.size());
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ztu::logger::debug("Parsed % tex_coords.", tex_coords.size());
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ztu::logger::debug("Parsed % triangles.", triangles.size());
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// Copy buffer into store and keep capacity.
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store.meshes.add(mesh_buffer);
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}
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if (clear_read_buffer)
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{
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read_buffer.clear();
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}
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mesh_buffer.clear();
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vertex_ids.clear();
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};
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const auto find_or_push_vertex = [&](const vertex_type& vertex) -> index_type
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{
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auto indexed_vid = indexed_vertex_type{
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.vertex = vertex,
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.buffer_index = static_cast<index_type>(positions.size())
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};
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// Search through sorted lookup to check if index combination is unique
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const auto [ id_it, unique ] = vertex_ids.insert(indexed_vid);
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if (unique)
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{
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const auto& [ position_index, tex_coord_index, normal_index ] = vertex;
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// If index is out of range, push default constructed value.
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// Not ideal, but better than out of range indices.
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auto& position = positions.emplace_back();
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if (position_index < position_buffer.size())
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{
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position = position_buffer[position_index];
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}
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auto& normal = normals.emplace_back();
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if (normal_index < normal_buffer.size())
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{
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normal = normal_buffer[normal_index];
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}
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auto& tex_coord = tex_coords.emplace_back();
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if (tex_coord_index < tex_coord_buffer.size())
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{
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tex_coord = tex_coord_buffer[tex_coord_index];
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}
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}
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return id_it->buffer_index;
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};
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auto curr_material_library_it = dynamic_material_library_store::iterator_type{};
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auto has_material_library = false;
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const auto ec = ztu::parse_lines<codes>(
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in,
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pedantic,
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make_line_parser("v ", ztu::is_repeating, [&](const auto& param)
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{
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mesh_vertex_components::position position;
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if (parse_numeric_vector(param, position) != std::errc{}) [[unlikely]]
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{
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return codes::malformed_vertex;
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}
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position_buffer.push_back(position);
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return codes::ok;
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}),
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make_line_parser("vt ", ztu::is_repeating, [&](const auto& param)
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{
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mesh_vertex_components::tex_coord coord;
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if (parse_numeric_vector(param, coord) != std::errc{}) [[unlikely]]
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{
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return codes::malformed_texture_coordinate;
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}
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tex_coord_buffer.push_back(coord);
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return codes::ok;
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}),
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make_line_parser("vn ", ztu::is_repeating, [&](const auto& param)
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{
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mesh_vertex_components::normal normal;
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if (parse_numeric_vector(param, normal) != std::errc{}) [[unlikely]]
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{
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return codes::malformed_normal;
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}
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normal_buffer.push_back(normal);
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return codes::ok;
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}),
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make_line_parser("o ", ztu::is_not_repeating, [&](const auto&)
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{
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push_mesh(); // Name is currently ignored
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return codes::ok;
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}),
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make_line_parser("f ", ztu::is_repeating, [&](const auto& param)
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{
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const auto begin = param.begin().base();
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const auto end = param.end().base();
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auto vertex = vertex_type{};
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index_type first_index{}, prev_index{};
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auto vertex_count = std::size_t{};
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for (auto it = begin; it <= end; ++it)
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{
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for (auto& component_index : vertex)
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{
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if (it != end and *it == '/')
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{
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++it;
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continue;
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}
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const auto [ptr, ec] = std::from_chars(it, end, component_index);
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if (ec != std::errc()) [[unlikely]]
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{
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// Discard whole face if one index is malformed.
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return codes::malformed_face;
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}
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--component_index; // Convert to zero based index.
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it = ptr;
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if (it == end or *it != '/')
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{
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break;
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}
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++it;
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}
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++vertex_count;
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if (it != end and *it != ' ') [[unlikely]]
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{
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return codes::malformed_face;
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}
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const auto curr_index = find_or_push_vertex(vertex);
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if (vertex_count >= 3)
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{
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auto& triangle = triangles.emplace_back();
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triangle[0] = first_index;
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triangle[1] = prev_index;
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triangle[2] = curr_index;
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}
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else if (vertex_count == 1)
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{
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first_index = curr_index;
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}
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prev_index = curr_index;
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}
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return codes::ok;
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}),
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make_line_parser("usemtl ", ztu::is_not_repeating, [&](const auto& param)
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{
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push_mesh(false);
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if (not has_material_library) [[unlikely]]
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{
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return codes::use_material_without_material_library;
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}
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const auto material_id_it = curr_material_library_it->find(param);
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if (material_id_it == curr_material_library_it->end()) [[unlikely]]
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{
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return codes::unknown_material_name;
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}
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mesh_buffer.material_id() = material_id_it->second;
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return codes::ok;
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}),
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make_line_parser("mtllib ", ztu::is_not_repeating, [&](const auto& param)
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{
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path_buffer.assign(param);
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if (path_buffer.is_relative())
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{
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path_buffer = base_directory;
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path_buffer /= param; // TODO Doesn't thi allocate an extra path?!?
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}
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const auto material_library_id_it = id_lookup.material_libraries.find(path_buffer);
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if (material_library_id_it != id_lookup.material_libraries.end()) [[likely]]
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{
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const auto material_library_id = material_library_id_it->second;
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std::tie(curr_material_library_it, has_material_library) = store.material_libraries.find(material_library_id);
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}
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else [[unlikely]]
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{
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ztu::logger::warn(
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"Could not find a matching material library with path '%'. Proceeding with default material.",
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param
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);
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has_material_library = false;
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}
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})
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);
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if (ec != codes::ok)
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{
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return make_error_code(ec);
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}
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push_mesh();
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return {};
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}
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