asset_manager.cpp

1
2
3
4
5
6
7
#include <planet/asset_manager.hpp>

#include <felspar/exceptions.hpp>

#include <fstream>
#include <mutex>
#include <sstream>

planet::asset_loader

 
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
namespace {
    auto &g_loaders_mtx() {
        static std::mutex m;
        return m;
    }
    auto &g_loaders() {
        static std::vector<planet::asset_loader const *> v;
        return v;
    }
}


planet::asset_loader::asset_loader() {
    std::scoped_lock _{g_loaders_mtx()};
    g_loaders().push_back(this);
}


planet::asset_loader::~asset_loader() {
    std::scoped_lock _{g_loaders_mtx()};
    std::erase(g_loaders(), this);
}

planet::asset_manager

 
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
planet::asset_manager::asset_manager(std::filesystem::path p)
: exe_directory{p.parent_path()} {}


std::vector<std::byte> planet::asset_manager::file_data(
        std::filesystem::path const &fn,
        felspar::source_location const &loc) const {
    std::stringstream ss;
    ss << "Could not find filename " << fn << '\n';
    std::scoped_lock _{g_loaders_mtx()};
    ss << g_loaders().size() << " asset loader(s) were tried for " << fn
       << '\n';
    for (auto const *loader : g_loaders()) {
        if (auto data = loader->try_load(ss, fn, loc); data) { return *data; }
    }
    throw felspar::stdexcept::runtime_error{ss.str(), loc};
}

planet::file_loader

 
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
planet::file_loader::file_loader(std::filesystem::path b)
: base{std::move(b)} {}


felspar::coro::generator<std::filesystem::path>
        planet::file_loader::search_paths() const {
    auto const cwd = std::filesystem::current_path();
    auto const current = (cwd / "share/").lexically_normal();
    co_yield current;
    auto const exe_based = (cwd / base / "share/").lexically_normal();
    if (exe_based != current) { co_yield exe_based; }
    auto const exe_parent =
            ((cwd / base).parent_path() / "share/").lexically_normal();
    if (exe_parent != exe_based and exe_parent != current) {
        co_yield exe_parent;
    }
}


std::optional<std::vector<std::byte>> planet::file_loader::try_load(
        std::ostream &log,
        std::filesystem::path const &fn,
        felspar::source_location const &) const {
    for (auto path : search_paths()) {
        auto pn = path / fn;
        log << "Looked for " << pn << '\n';
        if (std::filesystem::exists(pn)) { return file_data(pn); }
    }
    return {};
}


std::vector<std::byte>
        planet::file_loader::file_data(std::filesystem::path const &pathname) {
    std::vector<std::byte> d(std::filesystem::file_size(pathname));
    std::ifstream file{pathname, std::ios::binary};
    file.read(reinterpret_cast<char *>(d.data()), d.size());
    return d;
}