Just in case it’s at all useful. I just tried to run GarboriumDemo on my M1 MacBook Air in MATLAB R2019b with no joy:
Will draw 200 gabor patches per frame.
PTB-INFO: Retina display. Enabling panel fitter for scaled Retina compatibility mode.
PTB-INFO: This is Psychtoolbox-3 for Apple OS X, under Matlab 64-Bit (Version 3.0.17 - Build date: Dec 17 2020).
PTB-INFO: OS support status: OSX version 11.0 is not yet tested or officially supported at all for this Psychtoolbox release.
PTB-INFO: Type ‘PsychtoolboxVersion’ for more detailed version information.
PTB-INFO: Most parts of the Psychtoolbox distribution are licensed to you under terms of the MIT License, with
PTB-INFO: some restrictions. See file ‘License.txt’ in the Psychtoolbox root folder for the exact licensing conditions.
PTB-INFO: For information about paid priority support, community membership and commercial services, please type
PTB-INFO: ‘PsychPaidSupportAndServices’.
PTB-WARNING:PsychOSFixupFramebufferFormatForTiming: On screenId 0 no suitable mode with targetBpc 8. No-Op. Timing will suck!
PTB-ERROR[CGLSetFullScreenOnDisplay failed: invalid fullscreen drawable]. Main Screen() context
PTB-ERROR[Low-Level setup of window failed]:The specified gpu + display + gfx-driver combo may not support some requested feature.