Anamorphic Bloom

[aevyrie]

Screen.Recording.2025-01-02.at.1.22.57.AM.mp4

The JJ Abrahams

Screen.Recording.2025-01-02.at.9.56.21.AM.mp4

The Cyberfunk 2025

Objective

• Add the ability to scale bloom for artistic control, and to mimic anamorphic blurs.

Solution

• Add a scale factor in bloom settings, and plumb this to the shader.

Testing

• Added runtime-tweak-able setting to the bloom_3d/bloom_2d example

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Showcase

• Added scale parameter to Bloom to improve artistic control and enable anamorphic bloom.

[mate-h]

Looks good to me, just style changes

[tychedelia]

Approved pending SME feedback / benchmarking.

[IceSentry]

I don't have time to benchmark right now, but if someone benchmarks this and it shows no perf impact then the code LGTM. I'd just like to see some numbers first. My guess is that if there's an impact it will be pretty small, but would still be nice to know.

[aevyrie]

I added a shader def, so the fast path should still exist, and the new code is only compiled in when using nonuniform bloom scale.

[IceSentry]

With the ifdef I'm happy to merge it without benchmarking, but it would be nice to have numbers and yeet the ifdef if it's not necessary.

[aevyrie]

I'd like to try messing with the weights instead. After fixing the upscaling issue, non uniform blur looks worse because it can't rely on incorrect upsamples misaligned with the frags.

[aevyrie]

I couldn't find a decent path with weights without making more significant changes. I think this is good as-is now. I've tested with the car scene again with the latest settings, and I'm happy with how it looks.