1952428 - [webgpu] Demo at https://www.babylonjs.com/Demos/WebGPU/forestWebGPU.html flickers and doesnt render anything on the screen

Status: RESOLVED FIXED

(Core :: Graphics: WebGPU, defect)

Description

[Mayank Bansal]

Attachment: console-export-2025-3-7_9-46-38.txt

Go to https://www.babylonjs.com/Demos/WebGPU/forestWebGPU.html

Error in console:

Comment 1

[Mayank Bansal]

Attachment: about:support

Comment 2

[Erich Gubler [:ErichDonGubler] (he/him)]

This demo is mostly working now. It still apparently wants to use the external texture API (bug 1827116):

WebGPU compilation info for shader module "BabylonWebGPUDevice0_CopyVideoToTexture_FragmentShader_DontInvertY" (1 error(s), 0 warning(s), 0 info)

Shader 'BabylonWebGPUDevice0_CopyVideoToTexture_FragmentShader_DontInvertY' parsing error: unknown type: `texture_external`
  ┌─ wgsl:3:45
  │
3 │     @group(0) @binding(1) var videoTexture: texture_external;
  │                                             ^^^^^^^^^^^^^^^^ unknown type

Comment 3

[Erich Gubler [:ErichDonGubler] (he/him)]

Ah, actually, I see no rendering differences with Chrome. I'll close this for now; we have ample follow-up for the external texture API.

Comment 4

[Mayank Bansal]

The demo doesnt render for me on Nightly. On chrome it renders.

Comment 5

[Erich Gubler [:ErichDonGubler] (he/him)]

Mayank: Are you using the latest Nightly? At the time I had written, the Nightly build fixing things was fresh off the presses.

If so, I'd love to see a profile and any console logs messages that may be relevant to WebGPU from your execution of the page.

Comment 6

[Mayank Bansal]

Latest Nightly.
Profile with logging: https://share.firefox.dev/4jumea3
Error message: attached.

Comment 7

[Mayank Bansal]

Attachment: console-export-2025-4-25_20-1-1.txt

Comment 8

[Erich Gubler [:ErichDonGubler] (he/him)]

Oh, nuts, I can reproduce that log on my Windows machine, but not macOS; the culprit there seems to be an OOM error on DX12. I must not have tested on Windows, and that's a mistake on my part. Sorry for the noise, and thank you for the logs! 😀