2 files changed, 21 insertions, 5 deletions
diff --git a/src/terrain/inc/terrain.h b/src/terrain/inc/terrain.h
index 9552555..d5f4e12 100644
--- a/src/terrain/inc/terrain.h
+++ b/src/terrain/inc/terrain.h
@@ -26,10 +26,11 @@ enum terrain_type
 struct terrain_map
 {
     enum terrain_type m[MAP_TILES][MAP_TILES];
-    int nx, ny;
+    int nx, ny, last_w, last_h;
 };
 
 void terrain_init(struct terrain_map *map);
+void terrain_update(struct terrain_map *map);
 int terrain_render(const struct terrain_map *map, const struct camera *cam);
 
 extern struct sprite grass_sprite;
diff --git a/src/terrain/src/terrain.c b/src/terrain/src/terrain.c
index 04df6e6..a528c10 100644
--- a/src/terrain/src/terrain.c
+++ b/src/terrain/src/terrain.c
@@ -7,6 +7,25 @@
 
 struct sprite grass_sprite;
 
+void terrain_update(struct terrain_map *const map)
+{
+    if (map->last_w != screen_w)
+    {
+        const int extra = !!(screen_w % TERRAIN_SZ);
+
+        map->nx = screen_w / TERRAIN_SZ + extra;
+        map->last_w = screen_w;
+    }
+
+    if (map->last_h != screen_h)
+    {
+        const int extra = !!(screen_h % TERRAIN_SZ);
+
+        map->ny = screen_h / TERRAIN_SZ + extra;
+        map->last_h = screen_h;
+    }
+}
+
 int terrain_render(const struct terrain_map *const map,
     const struct camera *const cam)
 {
@@ -59,9 +78,5 @@ int terrain_render(const struct terrain_map *const map,
 
 void terrain_init(struct terrain_map *const map)
 {
-    const int extra = !!(screen_w % TERRAIN_SZ);
-
     memset(map, 0, sizeof *map);
-    map->nx = screen_w / TERRAIN_SZ + extra;
-    map->ny = screen_h / TERRAIN_SZ + extra;
 }