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Third Party Issue
Votes
1
Found in
2019.4
2020.3
2021.1
2021.1.14f1
2021.2
2022.1
Issue ID
1351770
Regression
No
Same calculation gives different results when running Compute Shader due to Shader optimiser
How to reproduce:
1. Open the attached project
2. Open the Test Runner (Window -> General -> Test Runner)
3. In the Test Runner window, select 'Run All'
4. Inspect the results
Expected result: All tests pass
Actual result: Tests with Compute Shader fail
Reproducible with: 2019.4.29f1, 2020.3.16f1, 2021.1.17f1, 2021.2.0b7, 2022.1.0a5
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Resolution Note (2022.1.X):
The compiler we use (FXC) erroneously thinks that bit 8 (mask 0x100) is always set. Unfortunately, there's no way to fix this.
Using DXC (by adding "#pragma use_dxc" in the compute shader) is a potential workaround.