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[OpenGLCore] Result of Graphics.Blit in Coroutines becomes black in Builds with full screen mode

Graphics - General



Priority: 7Not yet prioritized for a release


Severity: 2Core functionality majorly impacted

How to reproduce:
1. Open the project in the attached ""
2. Make sure OpenGLCore is on top of graphics API list in PlayerSettings
3. Build standalone player
4. Run the player in full screen mode (uncheck Windowed)
5. Observe the quad
-> Quad is black (wrong)
6. Run the player again in windowed mode (check Windowed)
7. Observe the quad
-> Quad is yellow (correct)

Reproducible with: 2017.4.25f1, 2018.3.0b5, 2018.3.12f1, 2019.1.0a3, 2019.1.0a4, 2019.1.0b10, 2019.2.0a11, 2019.3.0a3

Note: The issue does not reproduce with other Graphics APIs ( Vulkan DX11 DX12 ). On 2017.4 Editor is also affected.
Note: The bug is gone if I use "yield return null" instead of "yield return new WaitForEndOfFrame()"

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