flowchart LR
    subgraph tex["reserved texture (8×4 tiles of 64 KB)"]
        t0["tile 0"]
        t1["tile 1"]
        t2["tile 2"]
        t3["tile 3 → NULL"]
        t4["tile 4 → NULL"]
    end
    subgraph heap["heap"]
        h0["page 0"]
        h1["page 1"]
        h2["page 2"]
    end
    t0 --> h0
    t1 --> h1
    t2 --> h2
    t3 --> z["one shared<br/>zero tile per device"]
    t4 --> z