Support for dithering using interleaved gradient noise

[mvaligursky]

A new type of noise, implemented without a texture lookup by directly generating the noise in the shader.

Comparison of noise patterns:

It's a noise that's supposed to work well with TAA, as it's based on a 3x3 grid, which is what TAA typically uses for rejection. Details: https://blog.demofox.org/2022/01/01/interleaved-gradient-noise-a-different-kind-of-low-discrepancy-sequence/

Adjusted the Dithered Transparency example to support this noise and also TAA for testing.

[slimbuck]

nice!

[slimbuck]

do you have any comparison screenshots old vs new?

[mvaligursky]

do you have any comparison screenshots old vs new?

Not really, it looks about the same :(

[mvaligursky]

Or to be more specific:

• for static camera, both blue noise and IGN do great job, and TAA resolves both to almost pattern-free transparency (depending on the transparency level)
• but for moving camera, both noise types smudge the transparency about the same .. no major improvement from IGN at the moment - this is where I hoped to get an improvement, as that's where the 3x3 pixel rejection takes place.