Graphics shaking on window resize

[maitysubhasis]

I shifted the coordinate to 0,0 to the left, top.
Now the drawn graphics are shaking on resize.

Any idea how to fix it.

It seems when the window is resized the window itself is trying to resize the graphics but on draw call the graphics is drawn again. Thats the reason for the shakiness.

Without the coordinate shift the shakiness does not occur.

[cwfitzgerald]

Is this using DX12 as a backend?

[maitysubhasis]

No, mac os.
Probably same as #786.

[mattmag]

I see this as well on Win10
https://stackoverflow.com/questions/65947880/window-resize-jitter-using-wgpu-ris-and-winit

[kvark]

I believe this is because the window is resized asynchronously from the rendering. So when you resize fast, at some point you window has width 5. Your frame is recorded for the viewport of 5. But by the time it's presented, the window is already of size 6. So CAMetalLayer scales the texture up from 5 to 6, and you see that your rectangle changes in size.

I don't know if anything could be done here.

[mattmag]

It happens even at slow resize speeds and is particularly distracting when text is involved.
I'll probably have to abandon my evaluation of wgpu-rs if nothing can be done about it, which is a bummer because I'm new to graphics programming and learning wgpu-rs has been fun and not too difficult.

Here is the behavior that I think users would expect

Should I start look looking into using gfx-rs directly?

[kvark]

Looks like a known problem - https://thume.ca/2019/06/19/glitchless-metal-window-resizing/
I made a patch following the documentation on presentsWithTransaction - gfx-rs/gfx#3627
It doesn't work for me. If you want to play with it, either the make quad in gfx-rs, or checkout out gfx-rs and uncommenting these lines would do.

[kvark]

Please try gfx-rs/gfx#3627 as an override to latest wgpu
There is also a similar issue - gfx-rs/wgpu#1168

[cwfitzgerald]

Closing because there is an existing wgpu issue.