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[iOS] Rendering issues when using Legacy VertexLit Shader on iPhone 5



To reproduce:
1. Open attached project ""
2. Open "Sample.unity" scene
3. Build for iOS
4. Deploy the Xcode project to an iOS device
5. Press the "Toggle VertexLit Sphere" button at the top of the screen
6. Observe the half sphere on the left of the screen

Expected result: the sphere on the left looks the same as it looked before pressing the button "beforepress.png"
Actual result: the sphere gets corrupted "afterpress.png"

(based on repros the regression on trunk probably happened between 2018.2.0a9 and 2018.3.0a1)
Reproduced on:
2018.3.0a1 2018.4.2f1 2019.1.7f1 2019.2.0b6 2019.3.0a6

Not reproduced on:
207.4.0f1 2017.4.29f1 2018.2.0a9 2018.2.0b1 2018.2.0b11 2018.2.21f1

Devices reproduced on:
- iPhone 5C iOS 9.3.2

Devices didn't reproduce on:
- iPhone 8 Plus iOS 12.0
- iPad Mini 2 iOS 9.2.1
- iPad Mini iOS 9.3.5
- VLNQA00216, Razer Phone 2 (Phone 2), Android 8.1.0, CPU: Snapdragon 845 SDM845, GPU: Adreno (TM) 630

  1. Response avatar

    Resolution Note:

    This particular case has been investigated thoroughly and we have decided, in the interests of protecting the stability and features of Unity for users that rely upon the affected versions, to not address this fix for the time being. We understand that this will cause problems for some users, and so may address in a future version.

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