D909 - A depth target is the slice its view names

Status: decided Date: 2026-10-20

A depth target is the slice that DB_DEPTH_VIEW.SLICE_START names: bits 10:0, with the high two in 12:11 (gfx103.json). Each slice is its own host attachment. Its id carries the slice in the thirteen bits above the base address; slice zero keeps the id the base alone gave. A dispatch's one-layer view of layer L of a depth array (BASE_ARRAY = DEPTH = L) names slice L's target.

Why: Grand Theft Auto V draws two 1024 x 1024 depth slices of one array and reads slice one back in a compute dispatch. With one attachment per base address, both slices were drawn into one target.

Rejected:

• Drawing every slice into one attachment and reading it as any layer: a later slice's draws overwrite an earlier one's.