TileMapTileDescriptor and building of tileset from them

nodes/TileMapObject.gd

@@ -1,17 +1,51 @@
 tool
 extends TileMap
 
+# todo: Give care about descriptor swaps being loseless / non introducing artifacts.
+
 ## Dictates whether tileset collision information should be exposed to game context.
 export var expose_collisions: bool = true
 
+var _descriptor_name_to_id: Dictionary # String to int
+
+func change_tile_texture(p_tile: String, p_texture: Texture) -> void:
+    if not p_tile in _descriptor_name_to_id:
+        push_error("Invalid tile name")
+        return
+    
+    var id := _descriptor_name_to_id[p_tile] as int
+    tile_set.tile_set_texture(id, p_texture)
+
 func _enter_tree() -> void:
+    tile_set = TileSet.new()
+
     # It's okay to fail here for non-grid contexts.
     if get_parent().connect("cell_size_changed", self, "_update_cell_size"):
         _update_cell_size(get_parent().cell_size, get_parent().cell_size)
 
+    if connect("child_entered_tree", self, "_on_child_entered_tree") != OK:
+        assert(false)
+
+    if connect("child_exiting_tree", self, "_on_child_exiting_tree") != OK:
+        assert(false)
+
 func _update_cell_size(_p_old_cell_size: Vector2, p_new_cell_size: Vector2) -> void:
     # We're assuming that all tile textures are of same dimensions.
     # todo: Diagnose mismatch by walking over all textures?
     var tileset_texture_size := tile_set.tile_get_texture(0).get_size()
     scale = p_new_cell_size / tileset_texture_size
     cell_size = p_new_cell_size / scale
+
+func _on_child_entered_tree(p_node: Node) -> void:
+    var id := tile_set.get_last_unused_tile_id()
+    _descriptor_name_to_id[p_node.name] = id
+    tile_set.create_tile(id)
+    tile_set.tile_set_texture(id, p_node.texture)
+
+func _on_child_exiting_tree(p_node: Node) -> void:
+    var id := _descriptor_name_to_id[p_node.name] as int
+    for cell in get_used_cells_by_id(id):
+        set_cell(cell.x, cell.y, -1)
+    tile_set.remove_tile(id)
+    if not _descriptor_name_to_id.erase(p_node.name):
+        assert(false)

nodes/TileMapTileDescriptor.gd

@@ -0,0 +1,13 @@
+tool
+extends Node
+class_name TK_TileMapTileDescriptor
+
+export var texture: Texture setget _set_texture
+
+# todo: More layer customizeability.
+export var is_solid: bool
+
+func _set_texture(p_texture: Texture) -> void:
+    texture = p_texture
+    if is_inside_tree():
+        get_parent().change_tile_texture(name, p_texture)

project.godot

@@ -138,6 +138,11 @@ _global_script_classes=[ {
 "class": "TK_GridContext",
 "language": "GDScript",
 "path": "res://nodes/GridContext.gd"
+}, {
+"base": "Node",
+"class": "TK_TileMapTileDescriptor",
+"language": "GDScript",
+"path": "res://nodes/TileMapTileDescriptor.gd"
 } ]
 _global_script_class_icons={
 "BrushPrefabs": "",
@@ -165,7 +170,8 @@ _global_script_class_icons={
 "TK_Controller": "",
 "TK_FittingSprite": "",
 "TK_GameObject": "",
-"TK_GridContext": ""
+"TK_GridContext": "",
+"TK_TileMapTileDescriptor": ""
 }
 
 [application]

scenes/Game.tscn

@@ -1,4 +1,4 @@
-[gd_scene load_steps=12 format=2]
+[gd_scene load_steps=10 format=2]
 
 [ext_resource path="res://nodes/FittingSprite.gd" type="Script" id=1]
 [ext_resource path="res://art/entities/fiend.png" type="Texture" id=2]
@@ -7,59 +7,39 @@
 [ext_resource path="res://nodes/GameObject.tscn" type="PackedScene" id=5]
 [ext_resource path="res://art/tiles/brickwall.png" type="Texture" id=6]
 [ext_resource path="res://nodes/TileMapObject.gd" type="Script" id=7]
-
-[sub_resource type="OccluderPolygon2D" id=2]
-polygon = PoolVector2Array( 16, 16, 0, 16, 0, 0, 16, 0 )
-
-[sub_resource type="ConvexPolygonShape2D" id=3]
-points = PoolVector2Array( 16, 16, 0, 16, 0, 16, 16, 16 )
-
-[sub_resource type="ConvexPolygonShape2D" id=4]
-points = PoolVector2Array( 16, 16, 0, 16, 0, 0, 16, 0 )
+[ext_resource path="res://scenes/tiles/Brickwall.tscn" type="PackedScene" id=8]
 
 [sub_resource type="TileSet" id=1]
-0/name = "brickwall.png 0"
+0/name = ""
 0/texture = ExtResource( 6 )
 0/tex_offset = Vector2( 0, 0 )
 0/modulate = Color( 1, 1, 1, 1 )
-0/region = Rect2( 0, 0, 16, 16 )
+0/region = Rect2( 0, 0, 0, 0 )
 0/tile_mode = 0
 0/occluder_offset = Vector2( 0, 0 )
-0/occluder = SubResource( 2 )
 0/navigation_offset = Vector2( 0, 0 )
 0/shape_offset = Vector2( 0, 0 )
 0/shape_transform = Transform2D( 1, 0, 0, 1, 0, 0 )
-0/shape = SubResource( 3 )
 0/shape_one_way = false
-0/shape_one_way_margin = 1.0
-0/shapes = [ {
-"autotile_coord": Vector2( 0, 0 ),
-"one_way": false,
-"one_way_margin": 1.0,
-"shape": SubResource( 3 ),
-"shape_transform": Transform2D( 1, 0, 0, 1, 0, 0 )
-}, {
-"autotile_coord": Vector2( 0, 0 ),
-"one_way": false,
-"one_way_margin": 1.0,
-"shape": SubResource( 4 ),
-"shape_transform": Transform2D( 1, 0, 0, 1, 0, 0 )
-} ]
+0/shape_one_way_margin = 0.0
+0/shapes = [  ]
 0/z_index = 0
 
 [node name="Gauntlet" type="Node"]
 
 [node name="GridContext" parent="." instance=ExtResource( 4 )]
 
-[node name="TileMap" type="TileMap" parent="GridContext"]
+[node name="TileMapObject" type="TileMap" parent="GridContext"]
 scale = Vector2( 4, 4 )
 tile_set = SubResource( 1 )
 cell_size = Vector2( 16, 16 )
 bake_navigation = true
 format = 1
-tile_data = PoolIntArray( 0, 0, 0, 1, 0, 0, 2, 0, 0, 3, 0, 0, 4, 0, 0, 5, 0, 0, 6, 0, 0, 7, 0, 0, 8, 0, 0, 9, 0, 0, 10, 0, 0, 11, 0, 0, 12, 0, 0, 13, 0, 0, 14, 0, 0, 15, 0, 0, 65536, 0, 0, 65542, 0, 0, 65551, 0, 0, 131072, 0, 0, 131082, 0, 0, 131087, 0, 0, 196608, 0, 0, 196618, 0, 0, 196623, 0, 0, 262144, 0, 0, 262145, 0, 0, 262146, 0, 0, 262147, 0, 0, 262148, 0, 0, 262149, 0, 0, 262150, 0, 0, 262151, 0, 0, 262152, 0, 0, 262153, 0, 0, 262154, 0, 0, 262156, 0, 0, 262157, 0, 0, 262158, 0, 0, 262159, 0, 0, 327680, 0, 0, 327683, 0, 0, 327695, 0, 0, 393216, 0, 0, 393226, 0, 0, 393227, 0, 0, 393229, 0, 0, 393231, 0, 0, 458752, 0, 0, 458761, 0, 0, 458762, 0, 0, 458767, 0, 0, 524288, 0, 0, 524289, 0, 0, 524290, 0, 0, 524291, 0, 0, 524292, 0, 0, 524293, 0, 0, 524294, 0, 0, 524295, 0, 0, 524296, 0, 0, 524297, 0, 0, 524298, 0, 0, 524299, 0, 0, 524300, 0, 0, 524301, 0, 0, 524302, 0, 0, 524303, 0, 0 )
+tile_data = PoolIntArray( 0, 0, 0, 1, 0, 0, 2, 0, 0, 3, 0, 0, 4, 0, 0, 5, 0, 0, 6, 0, 0, 7, 0, 0, 8, 0, 0, 9, 0, 0, 10, 0, 0, 11, 0, 0, 12, 0, 0, 13, 0, 0, 14, 0, 0, 15, 0, 0, 65536, 0, 0, 65551, 0, 0, 131072, 0, 0, 131074, 0, 0, 131085, 0, 0, 131087, 0, 0, 196608, 0, 0, 196623, 0, 0, 262144, 0, 0, 262146, 0, 0, 262157, 0, 0, 262159, 0, 0, 327680, 0, 0, 327695, 0, 0, 393216, 0, 0, 393218, 0, 0, 393219, 0, 0, 393220, 0, 0, 393221, 0, 0, 393222, 0, 0, 393223, 0, 0, 393224, 0, 0, 393225, 0, 0, 393226, 0, 0, 393227, 0, 0, 393228, 0, 0, 393229, 0, 0, 393231, 0, 0, 458752, 0, 0, 458767, 0, 0, 524288, 0, 0, 524289, 0, 0, 524290, 0, 0, 524291, 0, 0, 524292, 0, 0, 524293, 0, 0, 524294, 0, 0, 524295, 0, 0, 524296, 0, 0, 524297, 0, 0, 524298, 0, 0, 524299, 0, 0, 524300, 0, 0, 524301, 0, 0, 524302, 0, 0, 524303, 0, 0 )
 script = ExtResource( 7 )
 
+[node name="Brickwall" parent="GridContext/TileMapObject" instance=ExtResource( 8 )]
+
 [node name="GameObject" parent="GridContext" instance=ExtResource( 5 )]
 position = Vector2( 384, 128 )
 

scenes/tiles/Brickwall.tscn

@@ -0,0 +1,9 @@
+[gd_scene load_steps=3 format=2]
+
+[ext_resource path="res://art/tiles/brickwall.png" type="Texture" id=1]
+[ext_resource path="res://nodes/TileMapTileDescriptor.gd" type="Script" id=2]
+
+[node name="Brickwall" type="Node"]
+script = ExtResource( 2 )
+texture = ExtResource( 1 )
+is_solid = true