How to use 2D stretch mode on nested viewports?

system · May 31, 2020, 2:09pm


	Attention	Topic was automatically imported from the old Question2Answer platform.
	Asked By	frankjrix

I’m encountering problems inadding a second viewport to render my game in: I’ve been using 2D stretch mode so far, and had no problems whatsoever, but since I added a second viewport “layer” (for postprocessing shaders) a lot of things broke.

Some info on the settings: I’m using a window size of 1920 x 1080 on a 2k monitor specifically to catch “odd pixel issues”, which I had when using viewport stretch mode and were solved by switching to 2D.

I’m getting weird scaling artifacts, quite evident on my pixel art, and the game behaves like it’s using only 2/3 of the screen, offsetting the detected mouse position and stuff. I think that the scaling artifacts are due to the same problem.

In short, could someone help me to make this second viewport management as transparent as possible, and make it behave like the 2D stretch mode?

system · February 17, 2023, 5:00pm


	Reply From:	Atlinx

You must recreate the viewport stretching script from the engine to achieve this behaviour. Here’s the script I ended up using if this helps anyone else who stumbles upon this problem:

gist.github.com

https://gist.github.com/Atlinx/3b376bd6d4d2dff02956cb4fdcf46f3c

root_viewport.gd

extends Viewport

enum STRETCH_MODE { DISABLED, TWO_D, VIEWPORT }
enum STRETCH_ASPECT { IGNORE, KEEP, KEEP_WIDTH, KEEP_HEIGHT, EXPAND }

export(STRETCH_MODE) var stretch_mode = STRETCH_MODE.DISABLED
export(STRETCH_ASPECT) var stretch_aspect = STRETCH_MODE.DISABLED
export var stretch_scale: float = 1
export var override_project_settings: bool = false
export var stretch_min: Vector2

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