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[Vulkan] Objects are rendered in red when using DrawMeshInstanced method with Deferred shader



How to reproduce:
1. Open user's attached '' project
2. Open 'SampleScene' Scene
3. Enter Play Mode and observe that objects are colorful
4. Select 'Renderer' GameObject in the Hierarchy
5. Set Current Mode property to Complex

Expected result: Objects are colorful in Game View
Actual result: Objects are red in the Game View

Reproducible with: 2018.4.23f1, 2019.4.0f1, 2020.1.0b12, 2020.2.0a14

- Video of reproduction attached in Edit
- Not reproducible with DX11, DX12, Open GL Core
- Not reproducible on Windows Standalone, user states that it works fine on Win64 DX11, PS4, X1 and Switch
- Not reproducible with Unity primitive meshes
- Not reproducible with unlit, lit forward shaders; Reproducible with lit deferred shader

  1. Response avatar

    Resolution Note (2020.2.X):

    the problem is at the developer provided shaders, UNITY_VERTEX_INPUT_INSTANCE_ID needs to be defined in fragment shader input, and  UNITY_SETUP_INSTANCE_ID(input); needs to be called at the start of the fragment shader.

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