flowchart TD
    D["direct draw, root block at R"] --> P{"pipeline takes<br/>a root offset?"}
    P -- no --> OLD["table index 6 = R<br/>base instance = StartInstance"]
    P -- yes --> Q{"R - base in [0, 16 x 2^24)<br/>and 16-aligned?"}
    Q -- no --> MOVE["index 6 = R, base = R<br/>base instance = 0"]
    Q -- yes --> KEEP["index 6 unchanged<br/>base instance = (R - base) / 16"]
    KEEP --> DC["drawIndexedPrimitives"]
    MOVE --> DC
    OLD --> DC
    DC --> VS["vertex function: root at<br/>buffer 6 + 16 x base_instance"]
    VS -- "flat uint, location 49" --> PS["pixel shader: root at<br/>buffer 6 + 16 x offset"]