Bug 270465 – Vision Pro incorrectly applies gamma in WebXR session

• Status: NEW
• Component: WebXR

[Nicholas Butko]

Created attachment 470163 [details]
Non-immersive and immersive colors differ with the same shader.

When entering a WebXR session on vision pro, the colors appear washed out, and transparent objects are not transparent enough.

This can be corrected with code like:

`color = pow(color, vec4(2.2, 2.2, 2.2, 2.2))`

Note that it's important to correct the alpha channel in addition to the other color channels to get correct results.

You can see the effect in the attached screenshots. Before entering a webXR session, the colors look too dark (because of the inverse gamma corretion), but they look correct now in the WebXR view using the same shaders.

[Nicholas Butko]

You can find public reports of this bug as well:

https://discussions.apple.com/thread/255504626?sortBy=best

[Radar WebKit Bug Importer]

<rdar://problem/124041562>

[Daniel Rossi]

Created attachment 470721 [details]
WebXR video

[Daniel Rossi]

Created attachment 470722 [details]
WebXR Image

[Daniel Rossi]

Confirming this an issue but in the simulator. With video and image textures. The color gamma changes in WebXR immersive mode. 

Original thread here https://github.com/mrdoob/three.js/issues/28044

Tests to launch in WebXR to see the problem. In three they call what format is used for the texture "colorspace" with applied srgb. Not sure if that is related what is used for rendering textures. I found the issue also on the webxr sample so unrelated to three.

https://threejs.org/examples/?q=video#webxr_vr_video
https://threejs.org/examples/?q=pano#webxr_vr_panorama_depth
https://immersive-web.github.io/webxr-samples/stereo-video.html

[Daniel Rossi]

Created attachment 470723 [details]
WebXR sample video

[Daniel Rossi]

Created attachment 470724 [details]
non-Immersive video