[SOLVED] Loading ab buffer using Threads (lemmy.blahaj.zone)

submitted 2 years ago* (last edited 2 years ago) by Smorty@lemmy.blahaj.zone to c/godot@programming.dev

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I want to implement a threaded loading component into my game. I am currently saving all my settings and other level files as bytes externally (meaning not in the res:// folders), as I want to be able to export files and send them to others, so they can use them as well. There is the ResourceLoader.load_threaded_request() method, but that only returns Resources and not PackedByteArrays. As far as I can tell, there is only the FileAccess.get_file_as_bytes() method for importing byte files, which has to run in the main thread (and thus blocking it until the load is complete). Does someone know if I am missing some method here?

EDIT: I have put my fix for this into the comments

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[-] Smorty@lemmy.blahaj.zone 5 points 2 years ago* (last edited 2 years ago)

Fix: Run the FileAccess.get_file_as_bytes() method in a thread. I thought a thread wouldn't allow for loading files using FileAccess, but it seems I was mistaken. I personally just make the Thread run my _threaded_loading(file_path:String) method and then call a signal named loaded_bytes(data:PackedByteArray). The _threaded_loading method looks like this:

func _threaded_loading(path:String) -> void:
	print("I am the thread and I will now load this file")
	var file:FileAccess = FileAccess.open(path, FileAccess.READ)
	print("i have opened the file")
	var bytes:PackedByteArray = file.get_buffer(file.get_length())
	print("I have the bytes of the file")
	file.close()
	print("I have closed the file")
	call_deferred_thread_group("emit_signal", "loaded_bytes", bytes)
	return

It is important to emit the signal deferred, as a Thread on its own can't emit a signal on its own. I did print a lot in the method just to check that everything is working as intended. I hope this helps someone!

this post was submitted on 27 May 2024

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