Wall textures, need to do corners

nodes/combat_map.gd

@@ -5,6 +5,7 @@ extends Node2D
 @export var map_layout: MapLayout
 @onready var tile_map: TileMapLayer = %TerrainLayer
 @onready var highlight_map: GridOverlay = %OverlayLayer
+@onready var wall_renderer: WallRenderer = %WallRenderer
 
 const TILE_SIZE := 100.0
 const SOURCE_ID: int = 0
@@ -108,21 +109,7 @@ func is_tile_valid(coords: Vector2i) -> bool:
 func draw_room_walls() -> void:
 	if not map_layout:
 		return
-	var walls := map_layout.get_walls()
-	for wall in walls:
-		var from_world := coords_to_world(wall[0]) + Vector2(TILE_SIZE / 2, TILE_SIZE / 2)
-		var to_world := coords_to_world(wall[1]) + Vector2(TILE_SIZE / 2, TILE_SIZE / 2)
-		var midpoint := (from_world + to_world) / 2
-		var diff := to_world - from_world
-		var wall_dir := Vector2(-diff.y, diff.x).normalized()
-		var half_len := TILE_SIZE / 2
-
-		var line := Line2D.new()
-		line.add_point(midpoint - wall_dir * half_len)
-		line.add_point(midpoint + wall_dir * half_len)
-		line.width = 4.0
-		line.default_color = Color(0.6, 0.5, 0.4)
-		add_child(line)
+	wall_renderer.draw_walls_for_layout(map_layout)
 
 
 func load_from_layout() -> void:

nodes/wall_renderer.gd

@@ -0,0 +1,182 @@
+class_name WallRenderer
+extends Node2D
+
+## Renders wall textures by sampling segments from the aux_terrain texture atlas
+## and compositing them onto tile edges. Each edge is made of two half-segments.
+
+const TILE_SIZE := 100.0
+
+## Source atlas rects (x, y, w, h) from aux_terrain.BMP
+## Each edge has two half-segments that together span the full tile edge.
+
+# -- Left edge --
+const LEFT_UPPER_RECT := Rect2(0, 103, 20, 50)
+const LEFT_LOWER_RECT := Rect2(0, 53, 20, 50)
+
+# -- Right edge --
+const RIGHT_UPPER_RECT := Rect2(186, 103, 20, 50)
+const RIGHT_LOWER_RECT := Rect2(186, 53, 20, 50)
+
+# -- Top edge --
+const TOP_LEFT_RECT := Rect2(103, 0, 50, 20)
+const TOP_RIGHT_RECT := Rect2(53, 0, 50, 20)
+
+# -- Bottom edge --
+const BOTTOM_LEFT_RECT := Rect2(103, 186, 50, 20)
+const BOTTOM_RIGHT_RECT := Rect2(53, 186, 50, 20)
+
+## Wall thickness in game pixels (how far the border extends into the tile)
+const WALL_THICKNESS := 20.0
+## Half the tile edge length
+const HALF_EDGE := TILE_SIZE / 2.0
+
+@export var atlas_texture: Texture2D
+
+
+func draw_walls_for_layout(map_layout: MapLayout) -> void:
+	_clear_walls()
+	if not map_layout or not atlas_texture:
+		return
+
+	var tile_edges := _collect_tile_edges(map_layout)
+	for tile in tile_edges:
+		var edges: Array = tile_edges[tile]
+		_draw_tile_walls(tile, edges)
+
+
+func _clear_walls() -> void:
+	for child in get_children():
+		child.queue_free()
+
+
+func _collect_tile_edges(map_layout: MapLayout) -> Dictionary:
+	## Returns {Vector2i: Array[StringName]} mapping each tile to its wall edge directions.
+	var tile_edges: Dictionary = {}
+	var walls := map_layout.get_walls()
+
+	for wall in walls:
+		var tile_a: Vector2i = wall[0]
+		var tile_b: Vector2i = wall[1]
+		var diff: Vector2i = tile_b - tile_a
+
+		# Determine which edge of tile_a faces the wall
+		var edge_a := _direction_to_edge(diff)
+		if edge_a != &"":
+			if not tile_edges.has(tile_a):
+				tile_edges[tile_a] = []
+			tile_edges[tile_a].append(edge_a)
+
+		# Determine which edge of tile_b faces the wall (opposite direction)
+		var edge_b := _direction_to_edge(-diff)
+		if edge_b != &"" and map_layout.is_tile_valid(tile_b):
+			if not tile_edges.has(tile_b):
+				tile_edges[tile_b] = []
+			tile_edges[tile_b].append(edge_b)
+
+	return tile_edges
+
+
+func _direction_to_edge(dir: Vector2i) -> StringName:
+	match dir:
+		Vector2i.RIGHT:
+			return &"right"
+		Vector2i.LEFT:
+			return &"left"
+		Vector2i.UP:
+			return &"top"
+		Vector2i.DOWN:
+			return &"bottom"
+	return &""
+
+
+func _draw_tile_walls(tile: Vector2i, edges: Array) -> void:
+	var tile_origin := Vector2(tile) * TILE_SIZE
+
+	for edge in edges:
+		match edge:
+			&"left":
+				_draw_edge_segments(tile_origin, edge)
+			&"right":
+				_draw_edge_segments(tile_origin, edge)
+			&"top":
+				_draw_edge_segments(tile_origin, edge)
+			&"bottom":
+				_draw_edge_segments(tile_origin, edge)
+
+	# TODO: Outer corner segments
+	_draw_outer_corners(tile, tile_origin, edges)
+
+	# TODO: Inner corner segments (for non-rectangular room support)
+	_draw_inner_corners(tile, tile_origin, edges)
+
+
+func _draw_edge_segments(tile_origin: Vector2, edge: StringName) -> void:
+	var seg_a_rect: Rect2
+	var seg_b_rect: Rect2
+	var seg_a_offset: Vector2
+	var seg_b_offset: Vector2
+	var seg_a_size: Vector2
+	var seg_b_size: Vector2
+
+	match edge:
+		&"left":
+			seg_a_rect = LEFT_UPPER_RECT
+			seg_b_rect = LEFT_LOWER_RECT
+			seg_a_size = Vector2(WALL_THICKNESS, HALF_EDGE)
+			seg_b_size = Vector2(WALL_THICKNESS, HALF_EDGE)
+			seg_a_offset = Vector2(0, HALF_EDGE)
+			seg_b_offset = Vector2(0, 0)
+		&"right":
+			seg_a_rect = RIGHT_UPPER_RECT
+			seg_b_rect = RIGHT_LOWER_RECT
+			seg_a_size = Vector2(WALL_THICKNESS, HALF_EDGE)
+			seg_b_size = Vector2(WALL_THICKNESS, HALF_EDGE)
+			seg_a_offset = Vector2(TILE_SIZE - WALL_THICKNESS, HALF_EDGE)
+			seg_b_offset = Vector2(TILE_SIZE - WALL_THICKNESS, 0)
+		&"top":
+			seg_a_rect = TOP_LEFT_RECT
+			seg_b_rect = TOP_RIGHT_RECT
+			seg_a_size = Vector2(HALF_EDGE, WALL_THICKNESS)
+			seg_b_size = Vector2(HALF_EDGE, WALL_THICKNESS)
+			seg_a_offset = Vector2(HALF_EDGE, 0)
+			seg_b_offset = Vector2(0, 0)
+		&"bottom":
+			seg_a_rect = BOTTOM_LEFT_RECT
+			seg_b_rect = BOTTOM_RIGHT_RECT
+			seg_a_size = Vector2(HALF_EDGE, WALL_THICKNESS)
+			seg_b_size = Vector2(HALF_EDGE, WALL_THICKNESS)
+			seg_a_offset = Vector2(HALF_EDGE, TILE_SIZE - WALL_THICKNESS)
+			seg_b_offset = Vector2(0, TILE_SIZE - WALL_THICKNESS)
+
+	_create_segment_sprite(tile_origin + seg_a_offset, seg_a_size, seg_a_rect)
+	_create_segment_sprite(tile_origin + seg_b_offset, seg_b_size, seg_b_rect)
+
+
+func _create_segment_sprite(pos: Vector2, target_size: Vector2, source_rect: Rect2) -> void:
+	var atlas := AtlasTexture.new()
+	atlas.atlas = atlas_texture
+	atlas.region = source_rect
+
+	var sprite := Sprite2D.new()
+	sprite.texture = atlas
+	sprite.centered = false
+	sprite.position = pos
+	sprite.scale = Vector2(
+		target_size.x / source_rect.size.x,
+		target_size.y / source_rect.size.y
+	)
+	add_child(sprite)
+
+
+func _draw_outer_corners(_tile: Vector2i, _tile_origin: Vector2, _edges: Array) -> void:
+	# TODO: Implement outer corner segments
+	# Check pairs of adjacent edges (e.g., "top" + "left" → top-left outer corner)
+	# and draw the corner piece from the atlas.
+	pass
+
+
+func _draw_inner_corners(_tile: Vector2i, _tile_origin: Vector2, _edges: Array) -> void:
+	# TODO: Implement inner corner segments for non-rectangular rooms
+	# Check diagonal neighbors where both adjacent cardinal neighbors are floor
+	# but the diagonal is a wall/void.
+	pass

nodes/wall_renderer.gd.uid

@@ -0,0 +1 @@
+uid://c4f1vflwd81b8

prefabs/combat_map.tscn

@@ -6,6 +6,8 @@
 [ext_resource type="Script" uid="uid://cxl38x2m6sj3w" path="res://scripts/battle/grid_overlay.gd" id="4_jelju"]
 [ext_resource type="Texture2D" uid="uid://b1ks72fiesfrm" path="res://assets/sprites/combat_map_ui.BMP" id="5_mycp7"]
 [ext_resource type="Texture2D" uid="uid://65rmoynep5hy" path="res://assets/sprites/MP000A.BMP" id="6_muxvo"]
+[ext_resource type="Script" path="res://nodes/wall_renderer.gd" id="7_wallr"]
+[ext_resource type="Texture2D" uid="uid://b20mhn7ca5xyo" path="res://assets/sprites/aux_terrain.BMP" id="8_auxtr"]
 
 [sub_resource type="Resource" id="Resource_vcj5e"]
 script = ExtResource("2_8rn0j")
@@ -83,3 +85,9 @@ offset = Vector2(50, 50)
 [node name="TerrainLayer" type="TileMapLayer" parent="." unique_id=1201875024]
 unique_name_in_owner = true
 tile_set = SubResource("TileSet_e2u25")
+
+[node name="WallRenderer" type="Node2D" parent="."]
+unique_name_in_owner = true
+z_index = 1
+script = ExtResource("7_wallr")
+atlas_texture = ExtResource("8_auxtr")