Add modified Fragmented project files

src/Filesystem.gd

@@ -0,0 +1,52 @@
+extends Node
+
+var cwd = "."
+
+var shader_path = "":
+	get():
+		return shader_path
+	set(v):
+		shader_path = v
+		if "/" in v: # update current working directory
+			cwd = v.substr(0, v.rfind("/"))
+
+var shader: Shader:
+	get():
+		if shader_path == "":
+			return null
+		print("Load ", shader_path)
+		return load(shader_path)
+
+var image_path = ""
+
+var original_image: ImageTexture
+var result: Image
+
+var last_image_savepath = ""
+var last_original_image_path = ""
+
+func get_absolute_path(p: String) -> String:
+	# this only works on Linux!
+	if !p.begins_with("/"):
+		return self.cwd + "/" + p.lstrip("./")
+	return p
+
+func load_image() -> String: # returns an error message
+	print("Load ", image_path)
+	var img = Image.new()
+	var err = img.load(image_path)
+	if err == OK:
+		original_image = ImageTexture.create_from_image(img)
+		if self.last_image_savepath == "" or image_path != self.last_original_image_path:
+			self.last_image_savepath = image_path
+		self.last_original_image_path = image_path
+		return ""
+	return error_string(err) + " " + image_path
+
+func save_result(path: String):
+	print("Export ", path)
+	var err = self.result.save_png(path)
+	if err != OK:
+		print("An error occured!")
+	else:
+		self.last_image_savepath = path