Bug 270465

Summary:

Vision Pro incorrectly applies gamma in WebXR session

Product:

WebKit

Reporter:

Nicholas Butko <nb>

Component:

WebXR

Assignee:

Nobody <webkit-unassigned>

Status:

NEW

Severity:

Normal

CC:

connell, djg, electroteque, mwyrzykowski, tri, tr, webkit-bug-importer

Priority:

Keywords:

InRadar

Version:

Safari 17

Hardware:

Vision Pro

OS:

visionOS 1

Attachments:

Description	Flags
Non-immersive and immersive colors differ with the same shader.	none
WebXR video	none
WebXR Image	none
WebXR sample video	none
non-Immersive video	none

Nicholas Butko

Reported 2024-03-04 11:31:22 PST

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.

Attachments
Non-immersive and immersive colors differ with the same shader. (7.50 MB, image/png) 2024-03-04 11:31 PST, Nicholas Butko	no flags	Details
WebXR video (1.84 MB, image/png) 2024-04-02 09:58 PDT, Daniel Rossi	no flags	Details
WebXR Image (2.78 MB, image/png) 2024-04-02 09:59 PDT, Daniel Rossi	no flags	Details
WebXR sample video (1.37 MB, image/png) 2024-04-02 10:06 PDT, Daniel Rossi	no flags	Details
non-Immersive video (779.44 KB, image/png) 2024-04-02 10:07 PDT, Daniel Rossi	no flags	Details
View All Add attachment proposed patch, testcase, etc.

Nicholas Butko

Comment 1 2024-03-04 11:42:17 PST

You can find public reports of this bug as well: https://discussions.apple.com/thread/255504626?sortBy=best

Radar WebKit Bug Importer

Comment 2 2024-03-04 16:51:47 PST

<rdar://problem/124041562>

Daniel Rossi

Comment 3 2024-04-02 09:58:39 PDT

Created attachment 470721 [details] WebXR video

Daniel Rossi

Comment 4 2024-04-02 09:59:05 PDT

Created attachment 470722 [details] WebXR Image

Daniel Rossi

Comment 5 2024-04-02 10:00:41 PDT

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

Comment 6 2024-04-02 10:06:56 PDT

Created attachment 470723 [details] WebXR sample video

Daniel Rossi

Comment 7 2024-04-02 10:07:50 PDT

Created attachment 470724 [details] non-Immersive video

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