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Bug 5440

Summary: MacCatalyst build failures
Product: SDL Reporter: C.W. Betts <computers57>
Component: buildAssignee: Sam Lantinga <slouken>
Status: RESOLVED FIXED QA Contact: Sam Lantinga <slouken>
Severity: normal    
Priority: P2    
Version: HG 2.0   
Hardware: ARM   
OS: macOS 10.15   
Attachments: Mac Catalyst build patch
Set Metal as the default renderer on Mac Catalyst

Description C.W. Betts 2021-01-02 22:58:09 UTC 
Created attachment 4632 [details]
Mac Catalyst build patch

I tested building commit http://hg.libsdl.org/SDL/rev/55cdb379e866 on Mac Catalyst and found some issues:

* MTLFeatureSet_iOS_* enums aren't available under Mac Catalyst.
* OpenGL ES is unavailable under Mac Catalyst.
* Some Metal features are available under Catalyst but not iOS, such as displaySyncEnabled.

Attaching a patch that will make SDL2 build for Mac Catalyst.
Comment 1 C.W. Betts 2021-01-02 23:56:23 UTC 
Poking around, I also discovered that, due to defaulting to OpenGL, none of the example apps will show a screen. For Catalyst, Metal needs to be the default renderer. I edited video.c around line 1477 to make Metal the default renderer on Mac Catalyst and it worked fine.
Comment 2 C.W. Betts 2021-01-02 23:57:38 UTC 
Created attachment 4633 [details]
Set Metal as the default renderer on Mac Catalyst
Comment 3 C.W. Betts 2021-01-03 03:31:22 UTC 
Another issue I've discovered: The UI is unresponsive (beachball), but it still draws. I don't know how this will interact with games, though.
Comment 4 Sam Lantinga 2021-01-03 18:33:49 UTC 
Patch tweaked and added, thanks!
https://hg.libsdl.org/SDL/rev/50f265303173