Bind group validation errors in create_render_pipeline

[dhardy]

So I'm adjusting binding groups, attempting to divide a larger one into two. I've actually got things working now but would still like to know: what does this error mean?

wgpu error: Validation Error

Caused by:
    In Device::create_render_pipeline
      note: label = `images render pipeline`
    error in stage VERTEX
    error matching global binding at index 0 in group 0 against the pipeline layout: binding is missing from the pipeline layout

This occurred by removing all bind groups from the layout descriptor. I believe that is legal?

I also saw the error below (despite all visibility descriptors being set to either FRAGMENT or VERTEX), and another about texture dimension mis-match.

wgpu error: Validation Error

Caused by:
    In Device::create_render_pipeline
      note: label = `images render pipeline`
    error in stage VERTEX
    error matching global binding at index 0 in group 0 against the pipeline layout: visibility flags don't include the shader stage

I guess the errors might have been somehow due to incorrect incremental builds (I have had issues with those recently). In fact, I'm not sure what exactly solved the errors in the end. Just curious if you guys have any ideas why this might occur.

[kvark]

This error message is perhaps one of the most detailed ones we got recently. Since it's unclear still, we have a lot of room for improvement :) Perhaps, you could suggest the wording, assuming we can clarify what this means.

error in stage VERTEX
error matching global binding at index 0 in group 0 against the pipeline layout: binding is missing from the pipeline layout

It says that your vertex shader uses something with group=0 and binding=0, but the pipeline layout doesn't provide it. It can happen if the pipeline layout doesn't have any bind group layouts (BGLs), or the BGL[0] doesn't have binding=0, or there is a binding but its visibility doesn't include VERTEX.

The second posted error is the same as the first. Did you copy-paste by mistake?

[dhardy]

Aha, it wasn't clear to me that this is checking bind groups against shader requirements.

The second error is different (only the last bit about visibility). So from what you said I guess this error means that the vertex shader expects a binding at 0, 0 but this bind group is only available to the fragment shader?

Hmm, perhaps instead of error in stage VERTEX it could say error evaluating requirements of vertex stage shader?

[kvark]

Should be fixed in #1342