1960947 - [WebGPU] https://mebyz.github.io/webgpu-renderer-demo/ doesnt draw anything on the screen

Status: NEW

(Core :: Graphics: WebGPU, defect)

Description

[Mayank Bansal]

Attachment: console-export-2025-4-16_21-34-17.txt

Go to https://mebyz.github.io/webgpu-renderer-demo/
Wait for 30 seconds or so.

AR: Nothing is drawn on the screen
ER: it should, like Chrome

Comment 1

[Mayank Bansal]

Attachment: about:support

Comment 2

[Erich Gubler [:ErichDonGubler]]

It takes a while, like OP says, but console errors for WGSL shader compilation do come up in a large set after the paged has loaded. They're all failures of the form:

Shader 'TreeGen_ClusterB2_0 Vertex Module' parsing error: expected `(`, found ","
    ┌─ wgsl:138:31
    │
138 │     return fract(sin(dot(vec2f, vec2<f32>(12.9898, 78.233)) * 43758.5453));
    │                               ^ expected `(`

…where vec2f appears to be permitted in Chrome. I'm not sure that this is standard behavior, though, so this is either (1) a bug in both the application and Chrome in permitting it, or (2) Firefox needs to accept this. Not sure which yet, but I'll investigate!

Comment 3

[Erich Gubler [:ErichDonGubler]]

Aha, figured it out; we're not implementing shadowing of built-in types yet in WGSL:

fn random(vec2f: vec2<f32>) -> f32 {
    return fract(sin(dot(vec2f, vec2<f32>(12.9898, 78.233)) * 43758.5453));
}