3 files changed, 10 insertions, 4 deletions
diff --git a/src/tile-atlas.cpp b/src/tile-atlas.cpp
index 6c2bd746..3f08bc9c 100644
--- a/src/tile-atlas.cpp
+++ b/src/tile-atlas.cpp
@@ -28,7 +28,7 @@ std::array<Vector2, 4> tile_atlas::texcoords_for_id(std::size_t i) const
     return texcoords_[i];
 }
 
-auto tile_atlas::make_texcoords(Vector2ui pixel_size, Vector2ub tile_count, std::uint8_t i) -> texcoords
+auto tile_atlas::make_texcoords(Vector2ui pixel_size, Vector2ub tile_count, std::size_t i) -> texcoords
 {
     const auto sz = pixel_size/Vector2ui{tile_count};
     const Vector2ui id = { std::uint32_t(i % tile_count[0]), std::uint32_t(i / tile_count[0]) };
@@ -46,7 +46,7 @@ auto tile_atlas::make_texcoords_array(Vector2ui pixel_size, Vector2ub tile_count
 {
     const std::size_t N = Vector2ui{tile_count}.product();
     auto ptr = std::make_unique<std::array<Vector2, 4>[]>(N);
-    for (std::uint8_t i = 0; i < N; i++)
+    for (std::size_t i = 0; i < N; i++)
         ptr[i] = make_texcoords(pixel_size, tile_count, i);
     return ptr;
 }
diff --git a/src/tile-atlas.hpp b/src/tile-atlas.hpp
index 712c396c..97f9f408 100644
--- a/src/tile-atlas.hpp
+++ b/src/tile-atlas.hpp
@@ -29,7 +29,7 @@ struct tile_atlas final
 
 private:
     static std::unique_ptr<const texcoords[]> make_texcoords_array(Vector2ui pixel_size, Vector2ub tile_count);
-    static texcoords make_texcoords(Vector2ui pixel_size, Vector2ub tile_count, std::uint8_t i);
+    static texcoords make_texcoords(Vector2ui pixel_size, Vector2ub tile_count, std::size_t i);
 
     std::unique_ptr<const texcoords[]> texcoords_;
     GL::Texture2D tex_;
diff --git a/src/tile.hpp b/src/tile.hpp
index 067df3c7..499acd97 100644
--- a/src/tile.hpp
+++ b/src/tile.hpp
@@ -12,9 +12,15 @@ struct tile_atlas;
 struct tile_image final
 {
     std::shared_ptr<tile_atlas> atlas;
-    std::uint8_t variant = 0xff;
+    std::size_t variant = (std::size_t)-1;
 
     explicit operator bool() const noexcept { return !!atlas; }
+
+    std::strong_ordering operator<=>(const tile_image& o) const noexcept
+    {
+        const auto ret = atlas.get() <=> o.atlas.get();
+        return ret != std::strong_ordering::equal ? ret : variant <=> o.variant;
+    }
 };
 
 struct tile final