map_editor/tile_cursor.gdshader

@@ -0,0 +1,12 @@
+shader_type spatial;
+render_mode unshaded, blend_add, cull_disabled;
+
+uniform sampler2D source_texture;
+
+uniform vec4 modulate: source_color = vec4(1.0);
+
+void fragment() {
+	vec4 source = texture(source_texture, UV);
+	ALBEDO = (source.rgb * modulate.rgb);
+	ALPHA = source.a;
+}

tiling/tile.gd

@@ -0,0 +1,21 @@
+class_name Tile extends Resource
+
+##
+##
+##
+enum Kind {
+	FLOOR,
+	WALL,
+}
+
+##
+##
+##
+@export
+var kind := Kind.FLOOR
+
+##
+##
+##
+@export
+var mesh: Mesh = null

tiling/tile_grid.gd

@@ -1,4 +1,4 @@
-class_name MeshGrid extends Node3D
+class_name TileGrid extends Node3D
 
 const _CHUNK_SIZE := 32
 
@@ -8,17 +8,22 @@ const _GRID_ORIGIN := Vector2(0.5, 0.5)
 ## Baked block of meshes making up a segment of the grid.
 ##
 class Chunk:
+	var _floor_meshes: Array[Mesh] = []
+
 	var _multimesh_instances: Array[MultiMeshInstance] = []
 
-	var _meshes: Array[Mesh] = []
+	var _wall_meshes: Array[Mesh] = []
 
 	func _init() -> void:
-		_meshes.resize(_CHUNK_SIZE * _CHUNK_SIZE)
+		var buffer_size := _CHUNK_SIZE * _CHUNK_SIZE
+
+		_floor_meshes.resize(buffer_size)
+		_wall_meshes.resize(buffer_size)
 
 	##
 	## Invalidates the mesh block, re-baking its contents from the current mesh data set.
 	##
-	func invalidate(mesh_grid: MeshGrid, coordinate: Vector2i) -> void:
+	func invalidate(tile_grid: TileGrid, coordinate: Vector2i) -> void:
 		# TODO: Once this is all lowered into native code, look for ways to parallelize the loops.
 		for multimesh_instance in _multimesh_instances:
 			RenderingServer.free_rid(multimesh_instance._instance_rid)
@@ -28,10 +33,23 @@ class Chunk:
 
 		# Normalize mesh instance data for the chunk.
 		var transforms_by_mesh := {}
-		var grid_size := mesh_grid.size
+		var grid_size := tile_grid.size
 
-		for i in _meshes.size():
-			var mesh := _meshes[i]
+		for i in _floor_meshes.size():
+			var mesh := _floor_meshes[i]
+
+			if mesh != null:
+				if not(mesh in transforms_by_mesh):
+					transforms_by_mesh[mesh] = []
+
+				transforms_by_mesh[mesh].append(Transform3D(Basis.IDENTITY, Vector3(
+					(float(coordinate.x * _CHUNK_SIZE) + (i % _CHUNK_SIZE)) -
+						(float(grid_size.x) * _GRID_ORIGIN.x), 0.0,
+							(float(coordinate.y * _CHUNK_SIZE) + (i / _CHUNK_SIZE)) - 
+								(float(grid_size.y) * _GRID_ORIGIN.y))))
+
+		for i in _wall_meshes.size():
+			var mesh := _wall_meshes[i]
 
 			if mesh != null:
 				if not(mesh in transforms_by_mesh):
@@ -44,8 +62,8 @@ class Chunk:
 								(float(grid_size.y) * _GRID_ORIGIN.y))))
 
 		# (Re)-bake into multimesh instances for the chunk.
-		var scenario_rid := mesh_grid.get_world_3d().scenario
-		var global_transform := mesh_grid.global_transform
+		var scenario_rid := tile_grid.get_world_3d().scenario
+		var global_transform := tile_grid.global_transform
 
 		for chunk_mesh in transforms_by_mesh:
 			var multimesh_instance := MultiMeshInstance.new(
@@ -55,17 +73,27 @@ class Chunk:
 			_multimesh_instances.append(multimesh_instance)
 
 	##
-	## Sets the mesh location in the chunk at the relative [code]coordinatess[/code] to
+	## Sets the floor mesh in the chunk at the location relative [code]coordinatess[/code] to
 	## [code]mesh[/code].
 	##
 	## *Note* that [method Chunk.invalidate] must be called at some point after to visually update
 	## the chunk.
 	##
-	func set_mesh(coordinates: Vector2i, mesh: Mesh) -> void:
-		_meshes[(_CHUNK_SIZE * coordinates.y) + coordinates.x] = mesh
+	func set_floor_mesh(coordinates: Vector2i, mesh: Mesh) -> void:
+		_floor_meshes[(_CHUNK_SIZE * coordinates.y) + coordinates.x] = mesh
+
+	##
+	## Sets the wall mesh in the chunk at the location relative [code]coordinatess[/code] to
+	## [code]mesh[/code].
+	##
+	## *Note* that [method Chunk.invalidate] must be called at some point after to visually update
+	## the chunk.
+	##
+	func set_wall_mesh(coordinates: Vector2i, mesh: Mesh) -> void:
+		_wall_meshes[(_CHUNK_SIZE * coordinates.y) + coordinates.x] = mesh
 
 ##
-## Specialized multi-mesh instance convenience for use within the mesh grid and its chunks.
+## Specialized multi-mesh instance convenience for use within the tile grid and its chunks.
 ##
 class MultiMeshInstance:
 	var _instance_rid := RID()
@@ -97,7 +125,7 @@ var _chunks: Array[Chunk] = []
 var _chunks_size := Vector2i.ZERO
 
 ##
-## Size of the mesh grid (in engine units).
+## Size of the tile grid (in engine units).
 ##
 @export
 var size: Vector2i:
@@ -123,18 +151,40 @@ func _notification(what: int) -> void:
 					multimesh_instance.set_offset_transform(global_transform)
 
 ##
-## Clears the entire mesh grid to only contain [code]mesh[/code].
-##
-## [code]null[/code] may be past to [code]mesh[/code] for clearing the mesh grid to nothing.
+## Clears the entirety of the tile grid to only contain [code]tile[/code].
 ##
 ## For clearing a specific region of the mesh grid, see [method fill_mesh].
 ##
-func clear_mesh(mesh: Mesh) -> void:
+func clear_tiles(tile: Tile) -> void:
+	if tile == null:
+		for y in size.y:
+			for x in size.x:
+				var coordinates := Vector2i(x, y)
+				var chunk := _get_chunk(coordinates / _CHUNK_SIZE)
+				var chunk_coordinates := coordinates % _CHUNK_SIZE
+
+				chunk.set_floor_mesh(chunk_coordinates, null)
+				chunk.set_wall_mesh(chunk_coordinates, null)
+
+	else:
+		var mesh := tile.mesh
+
+		match tile.kind:
+			Tile.Kind.FLOOR:
 				for y in size.y:
 					for x in size.x:
 						var coordinate := Vector2i(x, y)
 
-			_get_chunk(coordinate / _CHUNK_SIZE).set_mesh(coordinate % _CHUNK_SIZE, mesh)
+						_get_chunk(coordinate / _CHUNK_SIZE).\
+							set_floor_mesh(coordinate % _CHUNK_SIZE, mesh)
+
+			Tile.Kind.WALL:
+				for y in size.y:
+					for x in size.x:
+						var coordinate := Vector2i(x, y)
+
+						_get_chunk(coordinate / _CHUNK_SIZE).\
+							set_floor_mesh(coordinate % _CHUNK_SIZE, mesh)
 
 	for y in _chunks_size.y:
 		for x in _chunks_size.x:
@@ -143,9 +193,7 @@ func clear_mesh(mesh: Mesh) -> void:
 			_get_chunk(chunk_coordinate).invalidate(self, chunk_coordinate)
 
 ##
-## Clears the region of the mesh grid at [code]area[/code] to only contain [code]mesh[/code].
-##
-## [code]null[/code] may be past to [code]mesh[/code] for filling the region to nothing.
+## Clears the region of the tile grid at [code]area[/code] to only contain [code]tile[/code].
 ##
 ## *Note* that [code]area[/code] *must* be within the area of the of the mesh grid, where
 ## [code]Vector2i.ZERO[/code] is the top-left and [member size] [code]- 1[/code] is the bottom-
@@ -153,19 +201,45 @@ func clear_mesh(mesh: Mesh) -> void:
 ##
 ## For clearing the whole of the mesh grid, see [method clear_mesh].
 ##
-func fill_mesh(area: Rect2i, mesh: Mesh) -> void:
+func fill_tiles(area: Rect2i, tile: Tile) -> void:
 	assert(get_area().encloses(area), "area must be within grid")
 
 	var filled_chunks := BitMap.new()
 
 	filled_chunks.resize(_chunks_size)
 
+	if tile == null:
+		for y in range(area.position.y, area.end.y):
+			for x in range(area.position.x, area.end.x):
+				var coordinates := Vector2i(x, y)
+				var chunk_coordinates := coordinates / _CHUNK_SIZE
+				var chunk := _get_chunk(coordinates / _CHUNK_SIZE)
+				var local_coordinates := coordinates % _CHUNK_SIZE
+
+				chunk.set_floor_mesh(local_coordinates, null)
+				chunk.set_wall_mesh(local_coordinates, null)
+				filled_chunks.set_bitv(chunk_coordinates, true)
+
+	else:
+		var mesh := tile.mesh
+
+		match tile.kind:
+			Tile.Kind.FLOOR:
 				for y in range(area.position.y, area.end.y):
 					for x in range(area.position.x, area.end.x):
 						var coordinate := Vector2i(x, y)
 						var chunk_coordinate := coordinate / _CHUNK_SIZE
 
-			_get_chunk(chunk_coordinate).set_mesh(coordinate % _CHUNK_SIZE, mesh)
+						_get_chunk(chunk_coordinate).set_floor_mesh(coordinate % _CHUNK_SIZE, mesh)
+						filled_chunks.set_bitv(chunk_coordinate, true)
+
+			Tile.Kind.WALL:
+				for y in range(area.position.y, area.end.y):
+					for x in range(area.position.x, area.end.x):
+						var coordinate := Vector2i(x, y)
+						var chunk_coordinate := coordinate / _CHUNK_SIZE
+
+						_get_chunk(chunk_coordinate).set_wall_mesh(coordinate % _CHUNK_SIZE, mesh)
 						filled_chunks.set_bitv(chunk_coordinate, true)
 
 	for y in _chunks_size.y:
@@ -175,35 +249,43 @@ func fill_mesh(area: Rect2i, mesh: Mesh) -> void:
 
 				_get_chunk(chunk_coordinate).invalidate(self, chunk_coordinate)
 
+##
+##
+##
 func get_area() -> Rect2i:
 	return Rect2i(Vector2i.ZERO, size)
 
 ##
-## Plots a single mesh at [code]coordinates[/code] to be [code]mesh[/code], overwriting whatever it
+## Plots a single tile at [code]coordinates[/code] to be [code]tile[/code], overwriting whatever it
 ## previously contained.
 ##
-## [code]null[/code] may be past to [code]mesh[/code] for clearing the mesh grid to nothing.
-##
 ## *Note* that [code]coordinates[/code] *must* be within the area of the of the mesh grid, where
 ## [code]Vector2i.ZERO[/code] is the top-left and [member size] [code]- 1[/code] is the bottom-
 ## right.
 ##
 ## For bulk-setting many meshes at once, see [method fill_mesh] and [method clear_mesh].
 ##
-func plot_mesh(coordinates: Vector2i, mesh: Mesh) -> void:
+func plot_tile(coordinates: Vector2i, tile: Tile) -> void:
 	assert(get_area().has_point(coordinates), "coordinate must be within grid")
 
 	var chunk_coordinates := coordinates / _CHUNK_SIZE
 	var chunk := _get_chunk(chunk_coordinates)
 
-	chunk.set_mesh(coordinates % _CHUNK_SIZE, mesh)
+	if tile == null:
+		var local_coordinates := coordinates % _CHUNK_SIZE
+
+		chunk.set_floor_mesh(local_coordinates, null)
+		chunk.set_wall_mesh(local_coordinates, null)
 		chunk.invalidate(self, chunk_coordinates)
 
-##
-## Returns [code]world_position[/code] converted into a coordinate aligned with the [MeshGrid].
-##
-## Note that [code]world_position[/code] values not within the [MeshGrid] will produce grid
-## coordinates outside of the [MeshGrid] bounds as well.
-##
-func world_to_grid(world_position: Vector2) -> Vector2i:
-	return Vector2i((world_position + (Vector2(size) * _GRID_ORIGIN)).floor())
+	else:
+		var mesh := tile.mesh
+
+		match tile.kind:
+			Tile.Kind.FLOOR:
+				chunk.set_floor_mesh(coordinates % _CHUNK_SIZE, mesh)
+				chunk.invalidate(self, chunk_coordinates)
+
+			Tile.Kind.WALL:
+				chunk.set_wall_mesh(coordinates % _CHUNK_SIZE, mesh)
+				chunk.invalidate(self, chunk_coordinates)

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