This bug report was migrated from our old Bugzilla tracker.

These attachments are available in the static archive:

• performSelectorOnMainThread patch (test.patch, text/plain, 2020-03-20 08:56:40 +0000, 831 bytes)

Reported in version: HG 2.0
Reported for operating system, platform: macOS 10.15, x86

Comments on the original bug report:

On 2020-03-20 08:56:40 +0000, Emir Marincic wrote:

Created attachment 4271
performSelectorOnMainThread patch

Resizing a window schedules an update on the SDLOpenGLContext, the next swap on the auxiliary thread doing the rendering causes a [NSOpenGLContext update] on that thread, which is not allowed.

[NSOpenGLContext update] only started checking whether it's called from the main thread (through pthread_main_np) from Catalina onwards and AppKit uses _CFExecutableLinkedOnOrAfter to provide compatibility for older executables by setting NSOpenGLContextSuppressThreadAssertions.

I'm not sure if this should be supported but swapping on a separate thread works on enough platforms that we didn't notice this bug for years. Calling update on the main thread instead through performSelectorOnMainThread seems to work fine and after testing a couple of hours I didn't notice any undesired effects.

I've attached the patch I've been testing locally

Best regards
Emir

On 2020-03-20 19:10:23 +0000, Sam Lantinga wrote:

Looks good, thanks!
https://hg.libsdl.org/SDL/rev/c8f27a5e868e