1 files changed, 82 insertions, 0 deletions
diff --git a/loader-impl.cpp b/loader-impl.cpp
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+++ b/loader-impl.cpp
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+#include "defs.hpp"
+#include "loader.hpp"
+#include "atlas.hpp"
+#include <Corrade/Containers/Optional.h>
+#include <Corrade/PluginManager/PluginManager.h>
+#include <Corrade/Utility/Resource.h>
+#include <Magnum/Trade/AbstractImporter.h>
+#include <Magnum/Trade/ImageData.h>
+#include <string>
+#include <unordered_map>
+#include <utility>
+#include <optional>
+
+namespace Magnum::Examples {
+
+struct loader_impl final : loader_
+{
+    const Utility::Resource shader_res{"game/shaders"};
+    PluginManager::Manager<Trade::AbstractImporter> plugins;
+    Containers::Pointer<Trade::AbstractImporter> tga_importer =
+        plugins.loadAndInstantiate("TgaImporter");
+
+    std::unordered_map<std::string, atlas_ptr> atlas_map;
+
+    std::string shader(const std::string& filename) override;
+    Trade::ImageData2D tile_texture(const std::string& filename) override;
+    atlas_ptr tile_atlas(const std::string& filename) override;
+
+    explicit loader_impl();
+    ~loader_impl() override;
+};
+
+std::string loader_impl::shader(const std::string& filename)
+{
+    auto ret = shader_res.get(filename);
+    if (ret.empty())
+        ABORT("can't find shader resource '%s'", filename.c_str());
+    return ret;
+}
+
+atlas_ptr loader_impl::tile_atlas(const std::string& name)
+{
+    constexpr Vector2i size{8, 4}; // TODO
+
+    auto it = atlas_map.find(name);
+    if (it != atlas_map.end())
+        return it->second;
+    auto atlas = std::make_shared<atlas_texture>(tile_texture(name), size);
+    atlas_map[name] = atlas;
+    return atlas;
+}
+
+Trade::ImageData2D loader_impl::tile_texture(const std::string& filename)
+{
+    if(!tga_importer || !tga_importer->openFile(filename))
+        ABORT("can't open tile image '%s'", filename.c_str());
+    auto img = tga_importer->image2D(0);
+    if (!img)
+        ABORT("can't allocate tile image for '%s'", filename.c_str());
+    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{};
+    return loader;
+}
+
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+loader_& loader = make_default_loader();
+
+} // namespace Magnum::Examples