Imps reinforce walls next to claimed ground (heroes avoid them, ~10x slower to break)

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

src/render3d.rs

@@ -14,7 +14,7 @@ pub const WALL_H: f32 = 0.95;
 const CHUNK: i32 = 16;
 pub const MAX_LIGHTS: usize = 24;
 const ATLAS_W: f32 = 256.0;
-const ATLAS_H: f32 = 80.0;
+const ATLAS_H: f32 = 96.0;
 const DISP_AMP: f32 = 0.11; // wall surface irregularity
 
 // ------------------------------------------------------------------ camera
@@ -482,7 +482,7 @@ fn build_chunk(map: &Map, amb: &[f32], cx: i32, cz: i32, gold_fill: f32, atlas:
     for z in cz * CHUNK..((cz + 1) * CHUNK).min(mh() as i32) {
         for x in cx * CHUNK..((cx + 1) * CHUNK).min(mw() as i32) {
             let t = map.t[idx(x, z)];
-            let tex = Gfx::tile_tex(t.kind, t.owner == Owner::Player, t.owner == Owner::Hero, t.var);
+            let tex = Gfx::tile_tex(t.kind, t.owner == Owner::Player, t.owner == Owner::Hero, t.var, t.reinforced);
             let (ua, ub) = cell_uv(tex);
             let (xf, zf) = (x as f32, z as f32);
             if !t.solid() {
@@ -694,7 +694,7 @@ fn chunk_sig(map: &Map, cx: i32, cz: i32, fill_bucket: u8) -> u64 {
                         Kind::Treasury => fill_bucket as u64,
                         _ => 0,
                     };
-                    (t.kind as u64) | (t.owner as u64) << 4 | (t.marked as u64) << 6 | extra << 8
+                    (t.kind as u64) | (t.owner as u64) << 5 | (t.marked as u64) << 7 | (t.reinforced as u64) << 8 | extra << 9
                 }
                 None => 0xff,
             };
@@ -1268,6 +1268,7 @@ fn draw_overlay(map: &Map, ov: &Overlay, n: usize) {
 pub fn minimap_color(tile: &Tile) -> [u8; 4] {
     match tile.kind {
         Kind::Rock => [40, 40, 48, 255],
+        Kind::Earth if tile.reinforced => [120, 70, 70, 255],
         Kind::Earth => [86, 60, 40, 255],
         Kind::Gold => [220, 180, 50, 255],
         Kind::Floor => match tile.owner {
@@ -1283,5 +1284,7 @@ pub fn minimap_color(tile: &Tile) -> [u8; 4] {
         Kind::Core => [255, 60, 60, 255],
         Kind::Portal => [190, 90, 240, 255],
         Kind::Gate => [230, 230, 255, 255],
+        Kind::Torture => [120, 40, 40, 255],
+        Kind::Tower => [255, 140, 60, 255],
     }
 }