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Copy pathgame_data.cpp
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62 lines (50 loc) · 2.66 KB
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#include <core/game_data.hpp>
#include <core/wad_types.hpp>
namespace core
{
namespace
{
// clang-format off
constexpr auto iwads = std::array{
iwad_description{.name = "doom.wad", .mission = game_mission::doom, .mode = game_mode::retail, .description = "Doom"},
iwad_description{.name = "doom1.wad", .mission = game_mission::doom, .mode = game_mode::shareware, .description = "Doom Shareware"},
iwad_description{.name = "doom2.wad", .mission = game_mission::doom2, .mode = game_mode::commercial, .description = "Doom II"},
};
// clang-format on
}
void add_wad_file(const std::filesystem::path& iwad_path, core::game_data& data)
{
fmt::print(" adding {}\n", iwad_path.string());
auto wad_file = std::unique_ptr<FILE, decltype(&fclose)>(fopen(iwad_path.string().c_str(), "rbe"), &fclose);
if (!wad_file) throw std::invalid_argument(fmt::format(" couldn't open {}", iwad_path.string()));
wad_header header;
fread(&header, sizeof(wad_header), 1, wad_file.get());
const auto id = std::string_view(header.identification.data(), 4);
if ((id != "IWAD") and (id != "PWAD"))
throw std::invalid_argument(fmt::format("Wad file {} doesn't have IWAD or PWAD id\n", iwad_path.string()));
auto lump_descriptors = std::vector<wad_lump_descriptor>(header.num_lumps);
fseek(wad_file.get(), header.info_table_offset, SEEK_SET);
fread(lump_descriptors.data(), sizeof(wad_lump_descriptor), header.num_lumps, wad_file.get());
data.lumps.reserve(data.lumps.size() + lump_descriptors.size());
std::ranges::transform(lump_descriptors, std::back_inserter(data.lumps), [&](const auto& descriptor) {
return lump_info{.name = array_to_string(descriptor.name),
.wad_file = wad_file.get(),
.position = descriptor.file_pos,
.size = descriptor.size};
});
for (auto i = 0; const auto& lump : data.lumps)
data.lump_table[lump.name] = i++;
data.wad_files.emplace_back(std::move(wad_file));
}
std::pair<std::filesystem::path, iwad_description> find_iwad()
{
const auto iwad_dir = std::filesystem::path(ROOT_DIR) / "wad";
for (const auto& iw : iwads)
{
const auto iwad_path = iwad_dir / iw.name;
if (exists(iwad_path)) return {iwad_path, iw};
}
throw std::runtime_error("Game mode indeterminate. No IWAD file was found. Try\n"
"specifying one with the '-iwad' command line parameter.\n");
}
}