TAA bug on camera viewport change

[ilyas-taouaou]

Bevy version

main branch

`AdapterInfo { name: "NVIDIA GeForce GTX 1650", vendor: 4318, device: 8066, device_type: DiscreteGpu, driver: "NVIDIA", driver_info: "566.03", backend: Vulkan }`

What you did

reproducing the bug:
https://github.com/ilyas-taouaou/bevy/tree/taa_bug

What went wrong

• what were you expecting?
  

• what actually happened?
  

[BenjaminBrienen]

How did you create the difference between your two screenshots? I think more information on this issue would definitely help us find a solution.

[ilyas-taouaou]

@BenjaminBrienen the first image is without TAA, the second is with TAA enabled on the split-screen example.

[mcobzarenco]

I also hit TAA not taking into account viewports (I think this is the issue at least) discord:

I am trying to use TAA where the camera viewport is smaller than the window, but it seems to distort the aspect ratio of the view as well as as add a black band (see video). When zooming in and out, the TAA samples shimmer like they're not correctly aligned with the image being rendered.

Everything seems fine when the viewport rect is the whole window. Is there some additional setup I need to do?

Screencast.from.2025-05-04.13-38-00.webm