Unity Issue Tracker - Shader compiler results Shader precision as mediump when unchanging non-x half4 precision vector component

Duplicate

Votes

0

Found in

2019.4

2020.3

2021.2

2021.2.3f1

2022.1

Issue ID

1383035

Regression

No

Shader compiler results Shader precision as mediump when unchanging non-x half4 precision vector component

Shader System

-

Nov 23, 2021

How to reproduce:
1. Open the attached "case_1383035" project
2. Select "Compile and show code" of the "Test" Shader in the Inspector
3. Observe the Shader precision of the returned "_Splat0.sample(...)" value
4. Open the "Test" Shader with a Text Editor and uncomment the 46th line
5. Repeat the 2nd and 3rd steps

Expected result: The Shader precision remains highp after uncommenting any "half4 materialHeights" vector component
Actual result: The Shader precision becomes mediump after uncommenting any "half4 materialHeights" vector component except for .x

Reproducible with: 2019.4.34f1, 2020.3.25f1, 2021.2.7f1, 2022.1.0b2

Note:
Reproducible with:
- Only the iOS Build Target
- The both Metal and OpenGL 4.2 Graphics APIs on MacOS

Not reproducible with:
- "Edit -> Project Settings -> Player -> Other Settings -> Shader Precision Model" set to "Use full sampler precision by default, ..."
- Any Graphics API on Windows