1 files changed, 35 insertions, 6 deletions
diff --git a/light-client/src/tilemap.rs b/light-client/src/tilemap.rs
index e7341efa..768f79ba 100644
--- a/light-client/src/tilemap.rs
+++ b/light-client/src/tilemap.rs
@@ -16,8 +16,9 @@
 
 */
 use hurrycurry_protocol::{glam::IVec2, TileIndex};
+use log::warn;
 use sdl2::rect::Rect;
-use std::collections::HashMap;
+use std::collections::{HashMap, HashSet};
 
 use crate::render::{
     sprite::{Sprite, SpriteDraw},
@@ -26,19 +27,44 @@ use crate::render::{
 
 #[derive(Default)]
 pub struct Tilemap {
+    connect_group_by_tile: Vec<Option<usize>>,
+    connect_members_by_group: Vec<HashSet<Option<TileIndex>>>,
     tile_srcs: Vec<[Rect; 16]>,
     tiles: HashMap<IVec2, SpriteDraw>,
 }
 
 impl Tilemap {
     pub fn init(&mut self, tile_names: &[String], sprite_rects: &HashMap<String, Rect>) {
+        let tile_index = tile_names
+            .iter()
+            .enumerate()
+            .map(|(t, i)| (i.to_string(), t))
+            .collect::<HashMap<_, _>>();
+        self.connect_group_by_tile = vec![None; tile_names.len()];
+        self.connect_members_by_group = include_str!("../assets/connect.csv")
+            .lines()
+            .enumerate()
+            .map(|(gid, line)| {
+                line.split(",")
+                    .flat_map(|tile| tile_index.get(tile).copied())
+                    .map(|ti| {
+                        self.connect_group_by_tile[ti] = Some(gid);
+                        Some(TileIndex(ti))
+                    })
+                    .collect::<HashSet<_>>()
+            })
+            .collect::<Vec<_>>();
+
         self.tile_srcs = tile_names
             .iter()
             .map(|name| {
                 let fallback = sprite_rects
                     .get(&format!("{name}+a"))
                     .copied()
-                    .unwrap_or(Rect::new(0, 0, 0, 0));
+                    .unwrap_or_else(|| {
+                        warn!("no sprite for tile {name:?}");
+                        Rect::new(0, 0, 0, 0)
+                    });
 
                 [
                     sprite_rects.get(&format!("{name}+")),
@@ -70,10 +96,13 @@ impl Tilemap {
         };
 
         let mut idx = 0;
-        idx |= 0b0100 * (Some(tile) == neighbors[0]) as usize;
-        idx |= 0b0001 * (Some(tile) == neighbors[1]) as usize;
-        idx |= 0b1000 * (Some(tile) == neighbors[2]) as usize;
-        idx |= 0b0010 * (Some(tile) == neighbors[3]) as usize;
+        if let Some(gid) = self.connect_group_by_tile[tile.0] {
+            let cgroup = &self.connect_members_by_group[gid];
+            idx |= 0b0100 * (cgroup.contains(&neighbors[0])) as usize;
+            idx |= 0b0001 * (cgroup.contains(&neighbors[1])) as usize;
+            idx |= 0b1000 * (cgroup.contains(&neighbors[2])) as usize;
+            idx |= 0b0010 * (cgroup.contains(&neighbors[3])) as usize;
+        }
 
         let src = self.tile_srcs[tile.0][idx];
         self.tiles