Added a property on the HDRP asset to allow users to avoid ray tracing effects running at too low percentages (case 1342588).

[anisunity]

After some thinking, the only viable solution we found was to add a parameter to define until which sub-resolution half res ray tracing effects are allowed.
https://fogbugz.unity3d.com/f/cases/1342588/

Testing status
Due to a bug, tests are failing randomly even on master (locally). So we'll have to run on yamato and make sure it's fine

[github-actions]

The following job should be run on every PR:
https://yamato.cds.internal.unity3d.com/jobs/902-Graphics/tree/master/.yamato%252F_abv.yml%2523General_Checks_2021.2

It looks like you're changing an HDRP Package or project
Please run the following jobs on your branch before merging your PR:
https://yamato.cds.internal.unity3d.com/jobs/902-Graphics/tree/master/.yamato%252Fall-hdrp.yml%2523PR_HDRP_2021.2

It looks like you're changing the Core SRP Package or project
You could run ABV on your branch before merging your PR, but it will start A LOT of jobs. Please be responsible about it and run it only when you feel the PR is ready:
https://yamato.cds.internal.unity3d.com/jobs/902-Graphics/tree/master/.yamato%252F_abv.yml%2523all_project_ci_2021.2
Be aware that any modifications to the Core package impacts everyone in the Graphics repo so please discuss the PR with your lead.

[github-actions]

It appears that you made a non-draft PR!
Please convert your PR to draft (button on the right side of the page).
See the PR template for more information.
Thank you!

[kecho]

Make sure to run the formatter, otherwise looks good.

[anisunity]

Formatting fixed

[remi-chapelain]

We need to update the documentation for this new checkbox in the dynamic resolution section of the HDRP asset.

Apart from that, feature is working well, it's not ideal but that's the best we can do for now.
If the screen percentage drops below the RT Half resolution threshold, all RT effects running at half resolution (RTR perf & RTGI perf) are force to full screen.

I added two new tests to prevent regression for this.
Basically, camera on the left uses DRS at 90% and the RT half threshold is 100%, so the half resolution get forced back to full resolution. Native camera on the right stays un-affected so keeps the half resolution.

[remi-chapelain]

All good 🟢

[anisunity]

All green except formatting (that i need to get from master), test will probably be -reinstable after rebase

[anisunity]

hallelujah