ReadonlyformatTexel format.
Optional ReadonlylabelDiagnostic name.
Optional ReadonlymipHow many mip levels to allocate; 1 — a single level — when omitted.
Omitted rather than passed as 1 for the whole tier that does not mipmap,
so the depth attachment's descriptor is the object it always was.
ReadonlysizeExtent, as WebGPU's array form.
ReadonlyusageBit set from GPU_TEXTURE_USAGE.
A texture allocation request — the depth attachment and §77's uploads.