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Won't Fix

Votes

0

Found in

2021.3.36f1

2022.3.21f1

2023.2.14f1

6000.0.0b11

6000.1.0a7

7000.0.0a1

Issue ID

UUM-66442

Regression

No

[Silicon] Artifacts are visible in a shader when it has a dither pattern

-

Reproduction steps:
1. Open the attached “ReproProj” project
2. Open the “Assets/Scenes/SampleScene.unity” Scene
3. Observe the Game view

Expected result: All materials in the Game view are clearly visible
Actual result: The “Sphere” GameObject has artifacts

Reproducible with: 2021.3.36f1, 2022.3.21f1, 2023.2.14f1, 6000.0.b11

Reproducible on: macOS 14.3.1 (M1 Max)
Not reproducible on: macOS 13.6.4 (Intel)

Note: The issue is more visible when zooming in/out

  1. Resolution Note:

    Alas, this seems to be a quite low-level issue inside drives with register allocation in the case of the non-uniform control flow (due to discard)

    There are, though, two quite easy workarounds:
    1. change `float DITHER_THRESHOLDS[16]` to be `const float DITHER_THRESHOLDS[16]` (or, more generally, make readonly array const indeed). This will move the initialization from runtime to "compiler, here is const data, please do something"; compiler seem to do the right thing

    2. add `#pragma use_dxc metal` to the shader in question - dxc is WAY better at generating the code for filling float array used in the shader (in repro project), making it actually float1 and const

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