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[iOS 12] [Metal] IOAF code 4 error freeze because of tessellation shader



How to reproduce:
1. Build the attached project for iOS (link in description)
2. Build & Run the project to a device via Xcode
3. Keep clicking buttons shown in screenshots (screenshots in edit)

Actual result: The Player freezes and errors are getting spammed.
Expected result: The Player doesn't freeze.

Reproducible with: 2018.4.11f1, 2019.2.10f1.

Devices reproducible with:
- iPhone XR (iOS 12.0)
- iPhone X (iOS 11.3.1)

Devices not reproducible with:
- iPhone X (iOS 13.0)
- iPhone 7 (iOS 12.3.1)

- Can't test 2017.4, 2019.3 and 2020.1 as the terrain completely breaks on these versions, but most likely the issue is reproducible there too.

  1. Response avatar

    Resolution Note:

    This is iOS 12 related, which has decreasing adoption. mostly A7/A8 stick to iOS 12 where tessellation is not a realistic use case, rest of the devices are typically iOS 13 by now
    No update from Apple about the filed bug report for workarounds. (will recheck with them)

    closing due to very low impact

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