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#include "src/loader.hpp"
#include "src/tile-atlas.hpp"
#include "compat/assert.hpp"
#include "compat/alloca.hpp"
#include <filesystem>
#include <unordered_map>
#include <utility>
#include <optional>
#include <Corrade/Containers/StringStlView.h>
#include <Corrade/PluginManager/PluginManager.h>
#include <Corrade/Utility/Resource.h>
#include <Corrade/Utility/Path.h>
#include <Magnum/ImageView.h>
#include <Magnum/Trade/AbstractImporter.h>
#include <Magnum/Trade/ImageData.h>
#include <Magnum/Trade/AbstractImageConverter.h>
#ifdef __GNUG__
#pragma GCC diagnostic ignored "-Walloca"
#endif
using StringView = Corrade::Containers::StringView;
namespace floormat {
struct loader_impl final : loader_
{
std::optional<Utility::Resource> shader_res;
PluginManager::Manager<Trade::AbstractImporter> importer_plugins;
Containers::Pointer<Trade::AbstractImporter> tga_importer =
importer_plugins.loadAndInstantiate("AnyImageImporter");
PluginManager::Manager<Trade::AbstractImageConverter> image_converter_plugins;
std::unordered_map<std::string, std::shared_ptr<struct tile_atlas>> atlas_map;
StringView shader(StringView filename) override;
Trade::ImageData2D tile_texture(StringView filename) override;
std::shared_ptr<struct tile_atlas> tile_atlas(StringView filename, Vector2ub size) override;
static void set_application_working_directory();
explicit loader_impl();
~loader_impl() override;
};
StringView loader_impl::shader(StringView filename)
{
if (!shader_res)
shader_res = std::make_optional<Utility::Resource>("floormat/shaders");
auto ret = shader_res->getString(filename);
if (ret.isEmpty())
fm_abort("can't find shader resource '%s'", filename.cbegin());
return ret;
}
std::shared_ptr<tile_atlas> loader_impl::tile_atlas(StringView name, Vector2ub size)
{
auto it = std::find_if(atlas_map.begin(), atlas_map.end(), [&](const auto& x) {
const auto& [k, v] = x;
return StringView{k} == name;
});
if (it != atlas_map.end())
return it->second;
auto image = tile_texture(name);
auto atlas = std::make_shared<struct tile_atlas>(name, image, size);
atlas_map[name] = atlas;
return atlas;
}
Trade::ImageData2D loader_impl::tile_texture(StringView filename_)
{
static_assert(IMAGE_PATH[sizeof(IMAGE_PATH)-2] == '/');
fm_assert(filename_.size() < 4096);
fm_assert(filename_.find('\\') == filename_.end());
fm_assert(filename_.find('\0') == filename_.end());
fm_assert(tga_importer);
constexpr std::size_t max_extension_length = 16;
char* const filename = (char*)alloca(filename_.size() + std::size(IMAGE_PATH) + max_extension_length);
const std::size_t len = fm_begin(
std::size_t off = std::size(IMAGE_PATH)-1;
std::memcpy(filename, IMAGE_PATH, off);
std::memcpy(filename + off, filename_.cbegin(), filename_.size());
return off + filename_.size();
);
for (const auto& extension : std::initializer_list<StringView>{ ".tga", ".png", ".webp", })
{
std::memcpy(filename + len, extension.data(), extension.size());
filename[len + extension.size()] = '\0';
if (Utility::Path::exists(filename) && tga_importer->openFile(filename))
{
auto img = tga_importer->image2D(0);
if (!img)
fm_abort("can't allocate tile image for '%s'", filename);
auto ret = std::move(*img);
return ret;
}
else
{
fm_warn("can't open '%s'", filename);
}
}
const auto path = Utility::Path::currentDirectory();
filename[len] = '\0';
fm_abort("can't open tile image '%s' (cwd '%s')", filename, path ? path->data() : "(null)");
}
void loader_::destroy()
{
loader.~loader_();
new (&loader) loader_impl();
}
void loader_impl::set_application_working_directory()
{
static bool once = false;
if (once)
return;
once = true;
const auto location = Utility::Path::executableLocation();
if (!location)
return;
std::filesystem::path path((std::string)*location);
path.replace_filename("..");
std::error_code error;
std::filesystem::current_path(path, error);
if (error.value()) {
fm_warn("failed to change working directory to '%s' (%s)",
path.string().data(), error.message().data());
}
}
loader_impl::loader_impl()
{
set_application_working_directory();
}
loader_impl::~loader_impl() = default;
static loader_& make_default_loader()
{
static loader_impl loader_singleton{};
return loader_singleton;
}
// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
loader_& loader = make_default_loader();
} // namespace floormat
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