Flicker with simple shader on OpenGL 3.3 + Iris Xe

[MatBleuBleu]

I am experiencing an unexplainable flicker on Iris Xe graphics using OpenGL 3.3 and a very simple shader.

I have taken a RenderDoc capture of the issue and you can see the flickering in the capture itself. The issue does not happen on nvidia.

1. Open the RenderDoc file provided on Iris Xe
2. Local EID 126 in the even browser
3. Look at the lines, some of them will have imperfections. Forcing a refresh by browsing to another even with make these imperfection move randomly.

This is not the first time I deal with OpenGL issues on Intel. I used to be able to bypass most of them by forcing a glFlush every now and then, but for this one, it is not helping. I simplied the shader as much as I could, so it should be easy for you to debug.

[karen_intel]

Hi Matt
Thanks for your report and sorry for the delay, I will be assisting you on this case
I can definitely see the flicker on EID 126. Could you tell me a bit more about the project?
I need to include as many details as possible on my report.
BTW I just saw you reported the same case in GitHub: this one and to avoid duplicates, I'd like to know which platform you prefer.

I'll check this issue with our driver team and keep you posted.
I will provide an internal report ID in a couple days any further update I have will be done in this channel

Karen

[MatBleuBleu]

Lets stick with Github. Thanks.

-Mat

[karen_intel]

Thanks Matt

Could you help me with the rest of the details in GitHub for my report

Blocking this thread as we will follow the conversation there

Karen