Setting vertex/index buffers to null?

[Mark Sibly]

Hi,

I'm just messing around, and it appears that it's OK to set a render pass vertex buffers to nullptr (as long as it's not used in the pipeline) but not the index buffer.

Not a big deal, just curious what the rules are for using nullptr here?

Bye,

Mark

[Corentin Wallez]

Hey Mark,

Being able to unset vertex buffers was added as part of the addition of maxBindGroupsPlusVertexBuffers to allow unsetting vertex buffers and going back under the limit. (For Dawn this limit does nothing and is not even validated because you can't reach it). There were discussions about allowing to unset other things like index buffers but people didn't want to add this capability yet.

The JS spec which is the source of truth for validation details like this shows the index buffer in setIndexBuffer as not nullable but just below shows it nullable for vertex buffers. That's how you can tell the rules.

Hope this helps,

Corentin

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[Mark Sibly]

> The JS spec which is the source of truth for validation details like this

D'oh, of course it is, thanks!

Bye,

Mark