1 files changed, 3 insertions, 0 deletions
diff --git a/floormat/app.hpp b/floormat/app.hpp
index 63c8fb81..50dca6f9 100644
--- a/floormat/app.hpp
+++ b/floormat/app.hpp
@@ -18,6 +18,8 @@ struct chunk;
 
 struct floormat_app
 {
+    struct z_bounds final { int8_t min, max; };
+
     explicit floormat_app() noexcept;
     virtual ~floormat_app() noexcept;
 
@@ -29,6 +31,7 @@ struct floormat_app
     virtual void update(float dt) = 0;
     virtual void maybe_initialize_chunk(const chunk_coords_& pos, chunk& c) = 0;
     virtual void draw() = 0;
+    virtual z_bounds get_z_bounds() = 0;
 
     virtual void on_mouse_move(const mouse_move_event& event) noexcept = 0;
     virtual void on_mouse_up_down(const mouse_button_event& event, bool is_down) noexcept = 0;