D692 - A stored image declares no format

Status: assumed Date: 2026-09-15

A guest image store translates to a storage image declared with format Unknown and the StorageImageWriteWithoutFormat capability, with the matching device feature requested where offered. A device without the feature is reported before a pipeline is built.

Why: the guest's format is in a descriptor the translator does not decode (D690), so any named format would be invented, and a wrong one silently reinterprets every texel. Unknown says the shader does not know, which is true. Sampled and stored images are separate host bindings, so a shader that stores and then samples one texture is not served.

Rejected:

• Naming a format such as Rgba8: silently wrong for every other format.
• Refusing the store: unnecessary once a format-free store needs no guess.