Basis textures with alpha appearing fully black and white on some iPads and older mobile devices when RGB_PVRTC_4BPPV1_Format is used

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Hm, that’s interesting… Could you print the value of kxt2Loader.workerConfig after detectSupport() has been called, on your macOS device? This depends on more than just the browser and OS, but on my macOS device (M1 Pro), I get —

Chrome and Firefox:

astcSupported: false
bptcSupported: false
dxtSupported: true
etc1Supported: false
etc2Supported: false
pvrtcSupported: false

Safari:

astcSupported: false
bptcSupported: false
dxtSupported: true
etc1Supported: true
etc2Supported: false
pvrtcSupported: false

Currently the transcoder prefers ETC1 over DXT, but maybe that shouldn’t be the case for textures with alpha channels. This could be worth filing a bug for.

I’d also thought that Safari + ANGLE was supposed to support more texture formats on M1 devices, but I’m not seeing it at the moment.

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