Crash when supplying too large mesh

[Wumpf]

Similar to too large textures previously, we have issues with too large buffers. Easiest way to get a too large buffer is to supply a too large mesh through any api.

Just as before we need more extensive vetting of user supplied data and need to tell wgpu to allow the largest possible buffer.

[emilk]

I tested this:

    rec.log(
        "big",
        &rerun::Mesh3D::new(vec![[0.0, 0.0, 0.0]; 1_000_000_000]),
    )?;

and got no crash, at least not on the native viewer.

It seems like the limit is pretty large, and this issue is more theoretical than the texture size limit

[Wumpf]

@roym899 do you remember how you got this issue? I missed to write the down the exact circumstances

[Wumpf]

default max buffer size is speced at 256mb https://www.w3.org/TR/webgpu/#limits
so yeah it gotta be a very large mesh, but it can happen :)

[Wumpf]

Looks like we can also hit this limit when supplying a lot of plot data. The crash then happens when egui tries to resize its staging buffer for uploading the data

thread 'ThreadId(1)' panicked at 'Failed to create staging buffer for index data'
egui-wgpu/src/renderer.rs:834