1 files changed, 119 insertions, 0 deletions
diff --git a/extractor/gnd_format.gd b/extractor/gnd_format.gd
index ea8d965..65635cf 100644
--- a/extractor/gnd_format.gd
+++ b/extractor/gnd_format.gd
@@ -1,6 +1,9 @@
 class_name GNDFormat
 
 
+const MAP_TILE_SIZE := 10.0
+
+
 ## Byte Length: 4 [br]
 ## GRAT
 var signature: String = "GRGN"
@@ -120,6 +123,67 @@ static func from_bytes(bytes: ByteStream) -> GNDFormat:
 	return gnd_format
 
 
+func get_cubes() -> Array:
+	var cubes := []
+	for cube in ground_mesh_cubes:
+		cubes.append({
+			"cube": cube,
+			Vector3(0, 1, 0): {
+				"surface": surfaces[cube.upwards_facing_surface_index],
+				"mesh": surfaces[cube.upwards_facing_surface_index].get_mesh({
+					Vector2(0, 0): Vector3(0, cube.top_left_height, 0),
+					Vector2(1, 0): Vector3(MAP_TILE_SIZE, cube.top_right_height, 0),
+					Vector2(1, 1): Vector3(MAP_TILE_SIZE, cube.bottom_right_height, MAP_TILE_SIZE),
+					Vector2(0, 1): Vector3(0, cube.bottom_left_height, MAP_TILE_SIZE),
+				}),
+			},
+		})
+	
+	return cubes
+
+
+func convert(data_path: String) -> GridMap:
+	var grid_map := GridMap.new()
+	grid_map.cell_size = Vector3(GNDFormat.MAP_TILE_SIZE, GNDFormat.MAP_TILE_SIZE, GNDFormat.MAP_TILE_SIZE)
+	grid_map.cell_center_x = false
+	grid_map.cell_center_y = false
+	grid_map.cell_center_z = false
+	
+	grid_map.position = Vector3(
+		(width * MAP_TILE_SIZE) / 2.0,
+		0,
+		-(height * MAP_TILE_SIZE) / 2.0,
+	)
+	
+	var library := MeshLibrary.new()
+	grid_map.mesh_library = library
+	
+	var cubes := get_cubes()
+	
+	for x in width:
+		for y in height:
+			var cube = cubes[x + y * width]
+			for surface_type in [Vector3(0, 1, 0)]:
+				var mesh: ArrayMesh = cube[surface_type].mesh
+				var material := StandardMaterial3D.new()
+				material.albedo_texture = load(
+					"%s/data/texture/%s" % [
+						data_path,
+						texture_paths[cube[surface_type].surface.texture_index]
+					]
+				)
+				
+				mesh.surface_set_material(0, material)
+				
+				var id := library.get_last_unused_item_id()
+				library.create_item(id)
+				library.set_item_mesh(id, mesh)
+				
+				grid_map.set_cell_item(Vector3(-x, 0, y), id)
+	
+	return grid_map
+
+
 class LightMapSlice:
 	## Byte Type: i32 [br]
 	## Byte Length: 4
@@ -229,6 +293,61 @@ class Surface:
 		)
 	
 	
+	func get_mesh(vertices: Dictionary[Vector2, Vector3]) -> ArrayMesh:
+		var surface_tool := SurfaceTool.new()
+		surface_tool.begin(Mesh.PRIMITIVE_TRIANGLES)
+		
+		var uvs = get_uvs()
+		var color = get_vertex_color()
+		
+		var tiles_per_surface := 2 * 2
+		
+		surface_tool.add_triangle_fan(
+			PackedVector3Array([
+				vertices[Vector2(0, 0)],
+				vertices[Vector2(1, 0)],
+				vertices[Vector2(1, 1)],
+			]),
+			PackedVector2Array([
+				uvs[Vector2(0, 0)] * tiles_per_surface,
+				uvs[Vector2(1, 0)] * tiles_per_surface,
+				uvs[Vector2(1, 1)] * tiles_per_surface,
+			]),
+			PackedColorArray([
+				color, color, color,
+			])
+		)
+		surface_tool.add_triangle_fan(
+			PackedVector3Array([
+				vertices[Vector2(0, 0)],
+				vertices[Vector2(1, 1)],
+				vertices[Vector2(0, 1)],
+			]),
+			PackedVector2Array([
+				uvs[Vector2(0, 0)] * tiles_per_surface,
+				uvs[Vector2(1, 1)] * tiles_per_surface,
+				uvs[Vector2(0, 1)] * tiles_per_surface,
+			]),
+			PackedColorArray([
+				color, color, color,
+			])
+		)
+		
+		return surface_tool.commit()
+	
+	
+	func get_uv_id() -> String:
+		# TODO: add more data?
+		return (
+			"%d %d %d %d %d %d %d %d" % [
+				u_top_left, v_top_left,
+				u_top_right, v_top_right,
+				u_bottom_right, v_bottom_right,
+				u_bottom_left, v_bottom_left
+			]
+		).md5_text()
+	
+	
 	static func from_bytes(bytes: ByteStream) -> Surface:
 		var surface = Surface.new()