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Bug 5376

Summary: Corrupted background color in fullscreen Metal on Big Sur
Product: SDL Reporter: Cameron Gutman <cameron.gutman>
Component: renderAssignee: Ryan C. Gordon <icculus>
Status: ASSIGNED --- QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2 Keywords: target-2.0.14
Version: 2.0.12   
Hardware: x86   
OS: Other   
Attachments: Expected output (OpenGL)
Broken output (Metal)

Description Cameron Gutman 2020-12-02 03:13:34 UTC 
When running on Big Sur using Metal, I see areas in my app that should be solid black (cleared and never drawn) showing up as an odd striped red and black color. I haven't the slightest clue what is happening, but I was able to reproduce it with one of the SDL test apps.

It seems to be new to Big Sur and doesn't happen on Catalina. SDL 2.0.12 and SDL Hg (8d5e22789f3f) are both impacted.

The following invocations all reproduce the bug:
./testsprite2 --fullscreen-desktop
./testsprite2 --fullscreen

The following invocations do NOT reproduce the bug:
./testsprite2
./testsprite2 --fullscreen-desktop --renderer opengl
./testsprite2 --fullscreen --renderer opengl

In case it matters, I'm running:
MacBook Pro (13-inch, 2020, 4 Thunderbolt Ports)
2.3 GHz Intel Core i7 (Ice Lake)
Intel Iris Plus Graphics
macOS Big Sur 11.0.1
Xcode 12.2
Comment 1 Cameron Gutman 2020-12-02 03:14:20 UTC 
Created attachment 4552 [details]
Expected output (OpenGL)
Comment 2 Cameron Gutman 2020-12-02 03:14:54 UTC 
Created attachment 4553 [details]
Broken output (Metal)
Comment 3 Sam Lantinga 2020-12-09 14:26:40 UTC 
Ryan, can you look at this for the SDL release? Do you have hardware for testing?