Upscaling of fullscreen mode in mobile Chrome browser

Unity Engine
1

Hi. I want to discuss the upscaling problem, it is actual only for mobile browsers (or for mobile browser emulator).
I’ve noticed it in a few Unity releases, from 2018.2 to 2018.4.10f1.
As you may know, Screen.fullScreen is not working for mobile browsers (but working for desktop). But with Default WebGL Template we have a button to trigger a fullscreen mode externally. Yeah, this button is working for mobile browsers too, but it cause an upscale effect on a whole image. As a result, both 2d canvas elements and 3d models became blurry.
Why is it? Do you know any workaround for this?

2

This sounds like it could be due to a CSS pixels vs hardware pixels difference, i.e. “standard DPI” vs “high DPI”/“retina” display adaptation. By default Unity renders to standard DPI, but recently there is an option to adjust to use high DPI instead. See e.g. here WebGL on Retina

3

Thanks. It is probably fixed in 2019.3 beta, I need to check it myself.