func _draw() is called twice? Even when I have one node in the scene.

Owl

So I've run into this funny thing where the function _draw() for some reason is called twice, even when the function _ready is called once, and even when I have one node in the scene (example: Label), and the script attached to the node is reduced to contain nothing more than:

extends Label

func _ready():
	print("ready") # <- One output in the debug window. 


func _draw():
	print("draw function called") # <- Two outputs in the debug window.

I've started another project to test this scene and script there, and it worked fine, the function was called only once.

I read online that a Singleton may cause this to happen - but why? The script I have auto-loaded is completely different and shouldn't affect the _draw() function at all.

How do I fix this?

Edit: Windows 10, Godot 3.3.4

Thanks!

SirQuartz

Are you using Godot 3 or Godot 4?

Owl

SirQuartz Hey there, sorry for not mentioning, I have: Windows 10, Godot 3.3.4

SirQuartz

Owl Could you try this in the latest release build of Godot and see if the error still persists? 3.3.4 is several versions behind at this point (approaching a year old).

I'm currently using Godot 3.4.4 and I can't seem to recreate this.

Beyond that, I don't really know what would be causing this.

Owl

SirQuartz I'll be able to test it again tomorrow - and will report as soon as I can. Thanks for the suggestion!

Owl

SirQuartz

Hey again! So I tested my scene on Godot 3.4.4 (so the more recent version) - still, _draw() function is called twice.

So I tweaked my singleton to find what the culprit was, and indeed found it. I have this bit in my singleton:

if (OS.is_window_fullscreen()):
	OS.set_window_size(targeted_display_size)
else:
	OS.set_window_size(targeted_window_size)

The code above runs under _ready() (different node though). If I remove the lines above, then the _draw() function (for my Label node) is called once. If I keep them there, it is called twice.

So is it safe to assume that using the set_window_size() function makes all nodes in the scene have their _draw() function run again? I suppose to avoid the _draw() function from running more than it is expected to, the script that handles resolution should run in its own start-up room, and then when the resolution is set, we should move to the 'real' game rooms?

Right now I only have the one room I'm testing this all in. This is all new to me as I've just started working with Godot.

cybereality

Yes, that is expected. Draw will be called when the screen is repainted, such as when changing resolutions.

Owl

cybereality I see, that's good to know. So basically I should handle those things in separate scenes. Thanks again for all the help. 🙂

cybereality

Well you want draw to be called again. Otherwise you won't see anything, or it will be distorted.