518 lines
13 KiB
C++
518 lines
13 KiB
C++
#include "assets/file_parsers/mtl_parser.hpp"
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#include <charconv>
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#include <fstream>
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#include <array>
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#include "util/logger.hpp"
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#include "util/for_each.hpp"
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#include "util/line_parser.hpp"
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#include <execution>
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namespace assets::mtl_parser_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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{
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return "mtl_parser";
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}
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[[nodiscard]] std::string message(int ev) const override
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{
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// TODO these are incomplete
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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 mtl file.";
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case cannot_open_texture:
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return "Cannot open texture file.";
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case malformed_ambient_color:
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return "File contains malformed 'Ka' statement.";
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case malformed_diffuse_color:
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return "File contains malformed 'Kd' statement.";
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case malformed_specular_color:
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return "File contains malformed 'Ks' statement.";
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case malformed_specular_exponent:
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return "File contains malformed 'Ns' statement.";
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case malformed_dissolve:
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return "File contains malformed 'd' statement.";
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case unknown_line_begin:
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return "Unknown mtl line begin";
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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 mtl_parser_error
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inline std::error_category& mtl_parser_error_category()
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{
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static assets::mtl_parser_error::category category;
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return category;
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}
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namespace assets::mtl_parser_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), mtl_parser_error_category() };
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}
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} // namespace mtl_loader_error
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template<int L, typename T>
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std::errc parse_numeric_vector(std::string_view param, z3d::vec<L, T>& vec)
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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 (int i{}; i != L; ++i)
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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, vec[i]);
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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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std::error_code assets::mtl_parser::prefetch(
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path_id_lookups& lookups
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) {
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m_path_buffer.clear();
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lookups.material_libraries.by_extension(".mtl", m_path_buffer);
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std::for_each(
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std::execution::parallel_unsequenced_policy{},
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m_path_buffer.begin(),
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m_path_buffer.end(),
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prefetcher_context{
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lookups
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}
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);
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return {};
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}
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std::error_code assets::mtl_parser::load(
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path_id_lookups& lookups,
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data_stores& stores,
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bool pedantic
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) {
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m_path_buffer.clear();
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lookups.material_libraries.by_extension(".mtl", m_path_buffer);
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std::for_each(
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std::execution::parallel_unsequenced_policy{},
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m_path_buffer.begin(),
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m_path_buffer.end(),
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parser_context{
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lookups,
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stores,
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}
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);
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return {};
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}
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assets::mtl_parser::prefetcher_context::prefetcher_context(
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path_id_lookups& lookups
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) :
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m_lookups{ &lookups }
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{
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m_buffer.resize(8192);
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}
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void assets::mtl_parser::prefetcher_context::operator()(lookup_type::const_pointer entry) noexcept
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{
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namespace fs = std::filesystem;
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using namespace std::string_view_literals;
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// TODO 'bump' is missing!!!
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static constexpr auto keyword = "\nmap_"sv;
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using long_postfix_type = std::array<char, 2>;
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static constexpr auto postfix_length = std::tuple_size_v<long_postfix_type>;
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static constexpr auto make_postfix = [](const std::string_view str) static constexpr
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{
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auto postfix = long_postfix_type{};
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assert(str.length() >= postfix_length);
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std::copy_n(str.begin(), postfix.size(), postfix.begin());
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return postfix;
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};
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static constexpr auto postfixes = std::array{
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make_postfix("d "),
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make_postfix("Ka"),
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make_postfix("Kd"),
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make_postfix("Ks"),
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make_postfix("Ns")
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};
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const auto buffer_view = std::string_view(m_buffer);
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// Add linebreak to simplify line begin search.
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m_buffer.front() = '\n';
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auto leftover = std::size_t{ 1 };
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enum class match {
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exact,
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overflowed,
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none
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};
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const auto check_match = [](std::string_view& potential_match) static -> match
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{
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std::cout << '\'' << potential_match.substr(0, std::min(40ul, potential_match.size())) << '\'' << std::endl;
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if (potential_match.length() < postfix_length)
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{
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return match::overflowed;
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}
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const auto postfix = make_postfix(potential_match);
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// Optimized for SIMD.
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if (not std::ranges::contains(postfixes, postfix))
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{
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return match::none;
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}
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const auto long_match = postfix.back() != ' ';
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if (long_match and (
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potential_match.length() < postfix_length + sizeof(' ') or
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potential_match[postfix_length] != ' '
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)) {
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return match::overflowed;
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}
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const auto actual_postfix_length = std::size_t{ 1 } + static_cast<std::size_t>(long_match);
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const auto filename_begin = actual_postfix_length + sizeof(' ');
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const auto filename_end = potential_match.find('\n', filename_begin);
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if (filename_end == std::string_view::npos)
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{
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return match::overflowed;
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}
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const auto length = filename_end - filename_begin;
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potential_match = potential_match.substr(filename_begin, length);
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return match::exact;
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};
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const auto& [ filename, id ] = *entry;
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auto path_buffer = fs::path{};
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const auto base_dir = fs::canonical(fs::path(filename).parent_path());
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auto in = std::ifstream{ filename };
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if (not in.is_open())
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{
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ztu::logger::warn("Cannot open obj file %.", filename);
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return;
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}
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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(m_buffer.end() - leftover, m_buffer.end(), m_buffer.begin());
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in.read(m_buffer.data() + leftover, m_buffer.size() - leftover);
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const auto str = buffer_view.substr(0, leftover + in.gcount());
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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 keyword_end = pos + keyword.size();
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auto potential_match = str.substr(keyword_end);
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const auto match_type = check_match(potential_match);
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if (match_type == match::exact)
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{
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path_buffer.assign(potential_match);
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if (path_buffer.is_relative())
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{
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path_buffer = base_dir;
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path_buffer /= potential_match;
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}
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m_lookups->textures.try_emplace(path_buffer);
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pos += potential_match.size();
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leftover = 0;
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}
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else if (match_type == match::overflowed)
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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.", m_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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else
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{
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leftover = keyword.size();
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}
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}
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} while (not in.eof());
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}
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assets::mtl_parser::parser_context::parser_context(
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path_id_lookups& lookups,
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data_stores& stores
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) :
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m_lookups{ &lookups },
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m_stores{ &stores }
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{
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m_buffer.reserve(32);
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}
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void assets::mtl_parser::parser_context::reset()
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{
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m_buffer.clear();
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}
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void assets::mtl_parser::parser_context::operator()(lookup_type::const_pointer entry) noexcept
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{
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using mtl_parser_error::codes;
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using mtl_parser_error::make_error_code;
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namespace fs = std::filesystem;
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const auto& [ filename, id ] = *entry;
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// TODO unroll stuff
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auto in = std::ifstream{ filename };
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if (not in.is_open())
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{
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ztu::logger::warn("Cannot open mtl file %.", filename);
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return;
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}
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const auto base_dir = fs::canonical(fs::path(filename).parent_path());
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auto name = std::string{};
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auto material = material_data{};
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const auto push_material = [&]()
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{
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if (not name.empty())
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{
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const auto [ id_it, is_new ] = m_lookups->materials.try_emplace(filename / name);
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const auto material_id = id_it->second;
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m_stores->materials.insert(material_id, material);
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m_buffer.emplace(name, material_id);
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}
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name = {};
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material = {};
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};
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const auto ec = ztu::parse_lines<codes>(
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in,
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true, // TODO pedantic,
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ztu::make_line_parser("newmtl ", ztu::is_not_repeating, [&](const auto& param)
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{
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push_material();
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name = param;
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return codes::ok;
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}),
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ztu::make_line_parser("Ka ", ztu::is_not_repeating, [&](const auto& param)
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{
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material_components::ambient_filter ambient_filter;
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if (parse_numeric_vector(param, ambient_filter) != std::errc{}) [[unlikely]]
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{
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return codes::malformed_ambient_color; // TODO rename to filter
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}
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material.ambient_filter() = ambient_filter;
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material.component_flags |= material_components::flags::ambient_filter;
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return codes::ok;
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}),
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ztu::make_line_parser("Kd ", ztu::is_not_repeating, [&](const auto& param)
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{
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material_components::diffuse_filter diffuse_filter;
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if (parse_numeric_vector(param, diffuse_filter) != std::errc{}) [[unlikely]]
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{
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return codes::malformed_diffuse_color;
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}
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material.diffuse_filter() = diffuse_filter;
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material.component_flags |= material_components::flags::diffuse_filter;
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return codes::ok;
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}),
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ztu::make_line_parser("Ks ", ztu::is_not_repeating, [&](const auto& param)
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{
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material_components::specular_filter specular_filter;
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if (parse_numeric_vector(param, specular_filter) != std::errc{}) [[unlikely]]
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{
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return codes::malformed_specular_color;
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}
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material.specular_filter() = specular_filter;
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material.component_flags |= material_components::flags::specular_filter;
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return codes::ok;
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}),
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ztu::make_line_parser("Ns ", ztu::is_not_repeating, [&](const auto& param)
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{
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z3d::vec<1, material_components::shininess> shininess;
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if (parse_numeric_vector(param, shininess) != std::errc{}) [[unlikely]]
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{
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return codes::malformed_specular_exponent;
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}
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material.shininess() = shininess[0];
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material.component_flags |= material_components::flags::shininess;
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return codes::ok;
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}),
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ztu::make_line_parser("d ", ztu::is_not_repeating, [&](const auto& param)
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{
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z3d::vec<1, material_components::alpha> alpha{};
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if (parse_numeric_vector(param, alpha) != std::errc{}) [[unlikely]]
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{
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return codes::malformed_dissolve;
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}
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material.alpha() = alpha[0];
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material.component_flags |= material_components::flags::alpha;
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return codes::ok;
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}),
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ztu::make_line_parser("map_Ka ", ztu::is_not_repeating, [&](const auto& param)
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{
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if (const auto texture_id = fetch_texture_id(base_dir, param, "ambient filter"))
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{
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material.ambient_filter_texture_id() = *texture_id;
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material.component_flags |= material_components::flags::ambient_filter_texture;
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}
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return codes::ok;
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}),
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ztu::make_line_parser("map_Kd ", ztu::is_not_repeating, [&](const auto& param)
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{
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if (const auto texture_id = fetch_texture_id(base_dir, param, "diffuse filter"))
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{
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material.diffuse_filter_texture_id() = *texture_id;
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material.component_flags |= material_components::flags::diffuse_filter_texture;
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}
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return codes::ok;
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}),
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ztu::make_line_parser("map_Ks ", ztu::is_not_repeating, [&](const auto& param)
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{
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if (const auto texture_id = fetch_texture_id(base_dir, param, "specular filter"))
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{
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material.specular_filter_texture_id() = *texture_id;
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material.component_flags |= material_components::flags::specular_filter_texture;
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}
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return codes::ok;
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}),
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ztu::make_line_parser("map_Ns ", ztu::is_not_repeating, [&](const auto& param)
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{
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if (const auto texture_id = fetch_texture_id(base_dir, param, "shininess"))
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{
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material.shininess_texture_id() = *texture_id;
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material.component_flags |= material_components::flags::shininess_texture;
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}
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return codes::ok;
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}),
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ztu::make_line_parser("map_d ", ztu::is_not_repeating, [&](const auto& param)
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{
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if (const auto texture_id = fetch_texture_id(base_dir, param, "alpha"))
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{
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material.alpha_texture_id() = *texture_id;
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material.component_flags |= material_components::flags::alpha_texture;
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}
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return codes::ok;
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}),
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ztu::make_line_parser("bump ", ztu::is_not_repeating, [&](const auto& param)
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{
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if (const auto texture_id = fetch_texture_id(base_dir, param, "bump"))
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{
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material.bump_texture_id() = *texture_id;
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material.component_flags |= material_components::flags::bump_texture;
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}
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return codes::ok;
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})
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);
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if (ec != codes::ok)
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{
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const auto e = make_error_code(ec);
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ztu::logger::error("Error while parsing mtl file %: %", filename, e.message());
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}
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push_material();
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m_stores->material_libraries.insert(id, m_buffer);
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}
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std::optional<assets::texture_id> assets::mtl_parser::parser_context::fetch_texture_id(
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const std::filesystem::path& mtl_dir,
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std::string_view filename,
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std::string_view texture_type_name
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) {
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auto texture_filename = std::filesystem::path(filename);
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if (texture_filename.is_relative())
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{
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texture_filename = mtl_dir / texture_filename;
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}
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const auto texture_id_it = m_lookups->textures.find(texture_filename);
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if (texture_id_it == m_lookups->textures.end())
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{
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ztu::logger::warn(
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"%-texture at % has not been registered and can therefor not be used.",
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texture_type_name,
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texture_filename
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);
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return std::nullopt;
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}
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return texture_id_it->second;
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}
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