5 files changed, 105 insertions, 36 deletions
diff --git a/serialize/json-helper.hpp b/serialize/json-helper.hpp
index 345efe54..86c6a16f 100644
--- a/serialize/json-helper.hpp
+++ b/serialize/json-helper.hpp
@@ -22,7 +22,12 @@ std::tuple<t, bool> json_helper::from_json(const std::filesystem::path& pathname
     using Corrade::Utility::Error;
     std::ifstream s;
     s.exceptions(s.exceptions() | std::ios::failbit | std::ios::badbit);
-    s.open(pathname, std::ios_base::in);
+    try {
+        s.open(pathname, std::ios_base::in);
+    } catch (const std::ios::failure& e) {
+        Error{} << "failed to open" << pathname << "for reading:" << e.what();
+        return {};
+    }
     t ret;
     json j;
     s >> j;
@@ -41,7 +46,7 @@ bool json_helper::to_json(const t& self, const std::filesystem::path& pathname)
     try {
         s.open(pathname, std::ios_base::out | std::ios_base::trunc);
     } catch (const std::ios::failure& e) {
-        Error{Error::Flag::NoSpace} << "failed to open '" << pathname << "' for writing: " << e.what();
+        Error{} << "failed to open" << pathname << "for writing:" << e.what();
         return false;
     }
     s << j.dump(4);
@@ -49,4 +54,3 @@ bool json_helper::to_json(const t& self, const std::filesystem::path& pathname)
     s.flush();
     return true;
 }
-
diff --git a/serialize/magnum-vector.hpp b/serialize/magnum-vector.hpp
index eed37708..8ea5e13a 100644
--- a/serialize/magnum-vector.hpp
+++ b/serialize/magnum-vector.hpp
@@ -11,25 +11,32 @@ namespace nlohmann {
 
 template<std::size_t N, typename T>
 struct adl_serializer<Magnum::Math::Vector<N, T>> {
-    static void to_json(json& j, const Magnum::Math::Vector<N, T>& val)
-    {
-        std::array<T, N> array{};
-        for (std::size_t i = 0; i < N; i++)
-            array[i] = val[i];
-        j = array;
-    }
-    static void from_json(const json& j, Magnum::Math::Vector<N, T>& val)
-    {
-        std::array<T, N> array = j;
-        for (std::size_t i = 0; i < N; i++)
-            val[i] = array[i];
-    }
+    using vec = Magnum::Math::Vector<N, T>;
+    static void to_json(json& j, const vec& val);
+    static void from_json(const json& j, vec& val);
 };
 
-template<typename T> struct adl_serializer<Magnum::Math::Vector2<T>> : adl_serializer<Magnum::Math::Vector<2, T>> {};
+template <std::size_t N, typename T>
+void adl_serializer<Magnum::Math::Vector<N, T>>::to_json(json& j, const vec& val)
+{
+    std::array<T, N> array{};
+    for (std::size_t i = 0; i < N; i++)
+        array[i] = val[i];
+    j = array;
+}
+
+template <std::size_t N, typename T>
+void adl_serializer<Magnum::Math::Vector<N, T>>::from_json(const json& j, vec& val)
+{
+    std::array<T, N> array = j;
+    for (std::size_t i = 0; i < N; i++)
+        val[i] = array[i];
+}
+
 template<typename T> struct adl_serializer<Magnum::Math::Vector3<T>> : adl_serializer<Magnum::Math::Vector<3, T>> {};
 template<typename T> struct adl_serializer<Magnum::Math::Vector4<T>> : adl_serializer<Magnum::Math::Vector<4, T>> {};
 template<typename T> struct adl_serializer<Magnum::Math::Color3<T>>  : adl_serializer<Magnum::Math::Vector<3, T>> {};
 template<typename T> struct adl_serializer<Magnum::Math::Color4<T>>  : adl_serializer<Magnum::Math::Vector<4, T>> {};
+template<typename T> struct adl_serializer<Magnum::Math::Vector2<T>> : adl_serializer<Magnum::Math::Vector<2, T>> {};
 
 } // namespace nlohmann
diff --git a/serialize/tile-atlas.cpp b/serialize/tile-atlas.cpp
index c7e52057..8021f1d5 100644
--- a/serialize/tile-atlas.cpp
+++ b/serialize/tile-atlas.cpp
@@ -2,25 +2,16 @@
 #include "serialize/tile-atlas.hpp"
 #include "serialize/magnum-vector2i.hpp"
 #include "loader.hpp"
+#include <tuple>
 
 #include <nlohmann/json.hpp>
 
-namespace Magnum::Examples::Serialize {
-
-struct proxy_atlas final {
-    std::string name;
-    Vector2ui num_tiles;
-};
-
-NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(proxy_atlas, name, num_tiles)
-
-} // namespace Magnum::Examples::Serialize
+using namespace Magnum;
+using namespace Magnum::Examples;
 
 namespace nlohmann {
 
-using namespace Magnum::Examples;
-using namespace Magnum::Examples::Serialize;
-
+using proxy_atlas = std::tuple<std::string, Vector2ui>;
 using shared_atlas = std::shared_ptr<Magnum::Examples::tile_atlas>;
 
 void adl_serializer<shared_atlas>::to_json(json& j, const shared_atlas& x)
@@ -36,7 +27,8 @@ void adl_serializer<shared_atlas>::to_json(json& j, const shared_atlas& x)
 void adl_serializer<shared_atlas>::from_json(const json& j, shared_atlas& x)
 {
     proxy_atlas proxy = j;
-    x = loader.tile_atlas(proxy.name, proxy.num_tiles);
+    const auto& [name, num_tiles] = proxy;
+    x = loader.tile_atlas(name, num_tiles);
 }
 
 } // namespace nlohmann
diff --git a/serialize/tile.cpp b/serialize/tile.cpp
new file mode 100644
index 00000000..2f414e62
--- /dev/null
+++ b/serialize/tile.cpp
@@ -0,0 +1,50 @@
+#include "src/tile.hpp"
+#include "src/chunk.hpp"
+#include "serialize/tile.hpp"
+#include "serialize/tile-atlas.hpp"
+#include <tuple>
+#include <nlohmann/json.hpp>
+
+namespace Magnum::Examples {
+
+NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(tile_image, atlas, variant)
+NLOHMANN_DEFINE_TYPE_NON_INTRUSIVE(tile, ground_image, wall_north, wall_west, passability)
+
+} // namespace Magnum::Examples
+
+namespace nlohmann {
+
+using namespace Magnum::Examples;
+
+void adl_serializer<tile_image>::to_json(json& j, const tile_image& val) {
+    using nlohmann::to_json;
+    to_json(j, val);
+}
+
+void adl_serializer<tile_image>::from_json(const json& j, tile_image& val) {
+    using nlohmann::from_json;
+    from_json(j, val);
+}
+
+void adl_serializer<tile>::to_json(json& j, const tile& val) {
+    using nlohmann::to_json;
+    to_json(j, val);
+}
+
+void adl_serializer<tile>::from_json(const json& j, tile& val) {
+    using nlohmann::from_json;
+    from_json(j, val);
+}
+
+void adl_serializer<chunk>::to_json(json& j, const chunk& val) {
+    using nlohmann::to_json;
+    to_json(j, val.tiles());
+}
+
+void adl_serializer<chunk>::from_json(const json& j, chunk& val) {
+    using nlohmann::from_json;
+    std::remove_cvref_t<decltype(val.tiles())> tiles = {};
+    tiles = j;
+}
+
+} // namespace nlohmann
diff --git a/serialize/tile.hpp b/serialize/tile.hpp
index 4224fa54..d0a2d144 100644
--- a/serialize/tile.hpp
+++ b/serialize/tile.hpp
@@ -1,14 +1,30 @@
 #pragma once
-#include <nlohmann/json.hpp>
+#include <nlohmann/json_fwd.hpp>
 
 namespace Magnum::Examples {
-
-
-
+struct tile_image;
+struct tile;
+struct chunk;
 } // namespace Magnum::Examples
 
 namespace nlohmann {
 
-
+template<>
+struct adl_serializer<Magnum::Examples::tile_image> {
+    static void to_json(json& j, const Magnum::Examples::tile_image& val);
+    static void from_json(const json& j, Magnum::Examples::tile_image& val);
+};
+
+template<>
+struct adl_serializer<Magnum::Examples::tile> {
+    static void to_json(json& j, const Magnum::Examples::tile& val);
+    static void from_json(const json& j, Magnum::Examples::tile& val);
+};
+
+template<>
+struct adl_serializer<Magnum::Examples::chunk> {
+    static void to_json(json& j, const Magnum::Examples::chunk& val);
+    static void from_json(const json& j, Magnum::Examples::chunk& val);
+};
 
 } // namespace nlohmann