1 files changed, 89 insertions, 0 deletions
diff --git a/main/loader-impl.cpp b/main/loader-impl.cpp
new file mode 100644
index 00000000..24d43fdb
--- /dev/null
+++ b/main/loader-impl.cpp
@@ -0,0 +1,89 @@
+#include "loader.hpp"
+#include "tile-atlas.hpp"
+#include "compat/assert.hpp"
+#include <Corrade/Containers/Optional.h>
+#include <Corrade/Containers/StringView.h>
+#include <Corrade/PluginManager/PluginManager.h>
+#include <Corrade/Utility/Resource.h>
+#include <Magnum/ImageView.h>
+#include <Magnum/Trade/AbstractImporter.h>
+#include <Magnum/Trade/ImageData.h>
+#include <Magnum/Trade/AbstractImageConverter.h>
+#include <unordered_map>
+#include <utility>
+#include <optional>
+
+namespace Magnum::Examples {
+
+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;
+    Containers::Pointer<Trade::AbstractImageConverter> tga_converter =
+        image_converter_plugins.loadAndInstantiate("AnyImageConverter");
+
+    std::unordered_map<std::string, std::shared_ptr<struct tile_atlas>> atlas_map;
+
+    std::string shader(const Containers::StringView& filename) override;
+    Trade::ImageData2D tile_texture(const Containers::StringView& filename) override;
+    std::shared_ptr<struct tile_atlas> tile_atlas(const Containers::StringView& filename, Vector2i size) override;
+
+    explicit loader_impl();
+    ~loader_impl() override;
+};
+
+std::string loader_impl::shader(const Containers::StringView& filename)
+{
+    if (!shader_res)
+        shader_res = std::make_optional<Utility::Resource>("game/shaders");
+    auto ret = shader_res->getString(filename);
+    if (ret.isEmpty())
+        ABORT("can't find shader resource '%s'", filename.cbegin());
+    return ret;
+}
+
+std::shared_ptr<tile_atlas> loader_impl::tile_atlas(const Containers::StringView& name, Vector2i size)
+{
+    auto it = atlas_map.find(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(const Containers::StringView& filename)
+{
+    if(!tga_importer || !tga_importer->openFile(filename))
+        ABORT("can't open tile image '%s'", filename.cbegin());
+    auto img = tga_importer->image2D(0);
+    if (!img)
+        ABORT("can't allocate tile image for '%s'", filename.cbegin());
+    auto ret = std::move(*img);
+    return ret;
+}
+
+void loader_::destroy()
+{
+    loader.~loader_();
+    new (&loader) loader_impl();
+}
+
+loader_impl::loader_impl() = default;
+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 Magnum::Examples