Hi, recently I have noticed that some of my textures are flipped vertically. This only seems to happen when: The texture is ktx2 The texture is converted from a 32 bit png The texture is viewed on iOS I have a playground representing the issue here: https://playground.babylonjs.com/#Q9VZS9#814 O…

We’ve decided to close the GitHub issue as Apple added back support for the compressed textures in newer versions of iOS. The overall better fix is more complicated to implement and I filed a separate issue for this here: Make invertY flag more consistent across different texture loading scenarios ·…

I can repro. Seems like a bug to me. Do you mind filing one on GitHub to track? Thanks.

Thanks for confirming the issue @bghgary I’ve created the following Github issue: 32 bit Ktx2 textures are flipped vertically on ios · Issue #12349 · BabylonJS/Babylon.js · GitHub Thanks

It looks like we are seeing differences between iOS versions. If you have an iOS device and happen to be reading this thread, can you try this PG (from above), post your iOS version, and screenshot of the result? Thanks.

@Charge Which is supposed to be the correct orientation for this image?

Ah, that’s interesting. I can confirm that I found the issue on iOS 15.3.1. When I first saw the issue, I wondered if it may be related to the change made here: Fix ETC1 decision tree in ktx2Decoder by bghgary · Pull Request #11491 · BabylonJS/Babylon.js · GitHub as the code path was changed for al…

That’s good to know, thanks @bghgary . Out of interest, is it fixed because apple re-introduced support for ETC2 or PVRTC in iOS 15.4?

Did they? I didn’t actually check. If this is true, then we still have a bug.

Sorry @bghgary , I was asking you if Apple re-introduced ETC2 or PVRTC in iOS 15.4. I did not mean to imply that it has been added.

Ktx2 flipped vertically on ios

Bugs

bghgary April 6, 2022, 10:06pm 9

It appears this is fixed in iOS 15.4, but note that there are some issues with 15.4 that will hopefully be addressed by Apple soon.

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Ktx2 flipped vertically on ios

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