Superelliptical shape of corners

[yuraiz]

My suggestion is use superellipses instead of circles to crop corners

That corners looks more smooth and used in macos, ios and some physical devices

Here's an example screenshot with edited fragment shader

Here's screenshots with different superellipses

regular circle is subset of superellipse

In settings it can be like corner smoothing parameter in figma

I can finish this by myself if it's useful feature

[yilozt]

It's awesome feature! please open pull request when it is ready.