FSR 1 render pipeline

[matanui159]

Started working on this in my own time for fun and had some time to kill waiting for reviews so decided to finish it off and clean it up. Implements AMD's FSR upscaling. Currently only version 1 since it's provided as a set of shaders and how to use them which makes it a lot easier to port than later versions which is a full C library.

Only supports WebGPU rn since it uses texture gather operations which GLSL doesn't support. Technically support could be added by changing the code to do 4 separate texture fetches. This does also mean I had to port the FSR code to WGSL which was surprisingly easy. I left the code intentionally messy so it matches the original as closely as possible.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[bjsplat]

Please make sure to label your PR with "bug", "new feature" or "breaking change" label(s).
To prevent this PR from going to the changelog marked it with the "skip changelog" label.

[sebavan]

Could we add the glsl version even requiring several fetches ? as I guess in the end we ll end up with 4 texelFecth one per texel vs the 3 textureGather one per channel ?

And due to the texels locality the cache might be a huge time saver here ?

[sebavan]

Also a visual test would be great here if possible as well as a PG to test it out.

[ryantrem]

Do you have a PG that demonstrates this?

[matanui159]

Could we add the glsl version even requiring several fetches ? as I guess in the end we ll end up with 4 texelFecth one per texel vs the 3 textureGather one per channel ?

And due to the texels locality the cache might be a huge time saver here ?

Problem is rewriting the logic and hoping not to break anything. With the conversion to WGSL I tried to keep the code/logic as close as possible (which is why it's so messy. the FidelityFX team really don't like spaces apparently lol)

Do you have a PG that demonstrates this?

http://localhost:1338/#PIZ1GK#2257

[sebavan]

marking as draft for now to tidy up in progress reviews, lets reopen when ready