From 5b7eac31652880adc2b3733951d6deb6c4ddb1a4 Mon Sep 17 00:00:00 2001
From: Llywelwyn <lewiiswynne@gmail.com>
Date: Thu, 6 Jul 2023 19:42:13 +0100
Subject: [PATCH] bitset walls

---
 src/map.rs | 49 +++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/src/map.rs b/src/map.rs
index 613deb0..89586e2 100644
--- a/src/map.rs
+++ b/src/map.rs
@@ -204,7 +204,7 @@ pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
                     fg = RGB::from_f32(0.0, 1.0, 0.5);
                 }
                 TileType::Wall => {
-                    glyph = rltk::to_cp437('#');
+                    glyph = wall_glyph(&*map, x, y);
                     fg = RGB::from_f32(0.0, 1.0, 0.0);
                 }
             }
@@ -216,9 +216,54 @@ pub fn draw_map(ecs: &World, ctx: &mut Rltk) {
 
         // Move the coordinates
         x += 1;
-        if x > MAPWIDTH - 1 {
+        if x > (MAPWIDTH as i32) - 1 {
             x = 0;
             y += 1;
         }
     }
 }
+
+fn is_revealed_and_wall(map: &Map, x: i32, y: i32) -> bool {
+    let idx = map.xy_idx(x, y);
+    map.tiles[idx] == TileType::Wall && map.revealed_tiles[idx]
+}
+
+fn wall_glyph(map: &Map, x: i32, y: i32) -> rltk::FontCharType {
+    if x < 1 || x > map.width - 2 || y < 1 || y > map.height - 2 as i32 {
+        return 35;
+    }
+    let mut mask: u8 = 0;
+
+    if is_revealed_and_wall(map, x, y - 1) {
+        mask += 1;
+    }
+    if is_revealed_and_wall(map, x, y + 1) {
+        mask += 2;
+    }
+    if is_revealed_and_wall(map, x - 1, y) {
+        mask += 4;
+    }
+    if is_revealed_and_wall(map, x + 1, y) {
+        mask += 8;
+    }
+
+    match mask {
+        0 => 9,    // Pillar because we can't see neighbors
+        1 => 186,  // Wall only to the north
+        2 => 186,  // Wall only to the south
+        3 => 186,  // Wall to the north and south
+        4 => 205,  // Wall only to the west
+        5 => 188,  // Wall to the north and west
+        6 => 187,  // Wall to the south and west
+        7 => 185,  // Wall to the north, south and west
+        8 => 205,  // Wall only to the east
+        9 => 200,  // Wall to the north and east
+        10 => 201, // Wall to the south and east
+        11 => 204, // Wall to the north, south and east
+        12 => 205, // Wall to the east and west
+        13 => 202, // Wall to the east, west, and south
+        14 => 203, // Wall to the east, west, and north
+        15 => 206, // ╬ Wall on all sides
+        _ => 35,   // We missed one?
+    }
+}