4 files changed, 37 insertions, 5 deletions
diff --git a/serialize/wall-atlas.cpp b/serialize/wall-atlas.cpp
index 6f29026d..e2e6eee8 100644
--- a/serialize/wall-atlas.cpp
+++ b/serialize/wall-atlas.cpp
@@ -101,14 +101,28 @@ Info read_info_header(const json& jroot)
     return val;
 }
 
+void write_direction_metadata(json& jroot, const Direction& dir, Direction_ i)
+{
+    auto name = std::string_view{direction_index_to_name((size_t)i)};
+    auto j = json{json::value_t::object};
+    fm_assert(!jroot.contains(name));
+
+    for (auto [s_, memfn, tag] : Direction::members)
+    {
+        std::string_view s = s_;
+        const auto& group = dir.*memfn;
+        write_group_metadata(j[s], group);
+    }
+
+    jroot[name] = std::move(j);
+}
+
 void write_group_metadata(json& jgroup, const Group& val)
 {
-    fm_soft_assert(jgroup.is_object());
-    fm_soft_assert(jgroup.empty());
+    fm_assert(jgroup.is_object());
+    fm_assert(jgroup.empty());
 
-    //jgroup[""s] = ;
-    if (val.index != none)
-        jgroup["index"s] = val.index;
+    jgroup["index"s] = val.index;
     jgroup["count"s] = val.count;
     jgroup["pixel-size"s] = val.pixel_size;
     jgroup["tint-mult"s] = Vector4(val.tint_mult);
diff --git a/serialize/wall-atlas.hpp b/serialize/wall-atlas.hpp
index 16c43ab6..6c50da6b 100644
--- a/serialize/wall-atlas.hpp
+++ b/serialize/wall-atlas.hpp
@@ -18,10 +18,12 @@ namespace floormat::Wall::detail {
 
 uint8_t direction_index_from_name(StringView s);
 StringView direction_index_to_name(size_t i);
+
 [[nodiscard]] Group read_group_metadata(const nlohmann::json& jgroup);
 [[nodiscard]] Direction read_direction_metadata(const nlohmann::json& jroot, Direction_ dir);
 Info read_info_header(const nlohmann::json& jroot);
 
 void write_group_metadata(nlohmann::json& jgroup, const Group& val);
+void write_info_header(nlohmann::json& jroot, const Info& info);
 
 } // namespace floormat::Wall::detail
diff --git a/src/wall-atlas.cpp b/src/wall-atlas.cpp
index 24910549..344404d3 100644
--- a/src/wall-atlas.cpp
+++ b/src/wall-atlas.cpp
@@ -127,4 +127,10 @@ bool Direction::is_empty() const noexcept
     return true;
 }
 
+bool Frame::operator==(const Frame&) const noexcept = default;
+bool Group::operator==(const Group&) const noexcept = default;
+bool Direction::operator==(const Direction&) const noexcept = default;
+bool Info::operator==(const floormat::Wall::Info&) const noexcept = default;
+bool DirArrayIndex::operator==(const floormat::Wall::DirArrayIndex&) const noexcept = default;
+
 } // namespace floormat::Wall
diff --git a/src/wall-atlas.hpp b/src/wall-atlas.hpp
index c54c3971..8df0c1ec 100644
--- a/src/wall-atlas.hpp
+++ b/src/wall-atlas.hpp
@@ -15,6 +15,8 @@ namespace floormat::Wall {
 struct Frame
 {
     Vector2ui offset = { (unsigned)-1, (unsigned)-1 };
+
+    bool operator==(const Frame&) const noexcept;
 };
 
 struct Group
@@ -29,6 +31,8 @@ struct Group
 
     explicit operator bool() const noexcept { return !is_empty(); }
     bool is_empty() const noexcept { return count == 0; }
+
+    bool operator==(const Group&) const noexcept;
 };
 
 enum class Tag : uint8_t { wall, overlay, side, top, corner_L, corner_R, COUNT };
@@ -55,17 +59,23 @@ struct Direction
         { "corner-R"_s, &Direction::corner_R, Tag::corner_R, },
     };
     static_assert(arraySize(members) == (size_t)Tag::COUNT);
+
+    bool operator==(const Direction&) const noexcept;
 };
 
 struct Info
 {
     String name = "(unnamed)"_s, description = {};
     unsigned depth = 0;
+
+    bool operator==(const Info&) const noexcept;
 };
 
 struct DirArrayIndex {
     std::uint8_t val = (uint8_t)-1;
     operator bool() const { return val == (uint8_t)-1; }
+
+    bool operator==(const DirArrayIndex&) const noexcept;
 };
 
 } // namespace floormat::Wall