flowchart TD
    A["D3D12: DrawIndexedInstanced, topology TRIANGLEFAN<br/>indices h a b c CUT h2 d e f"] --> R["record_draw: count = 3 x (n - 2)<br/>mode by index size and strip cut value"]
    N["D3D12: DrawInstanced, TRIANGLEFAN<br/>no index buffer"] -->|"indices 0, 1, 2, ...<br/>base vertex = start vertex"| R
    R --> Q{"cut value set?"}
    Q -->|no| K1["convert_indices<br/>one thread per output index"]
    Q -->|yes| K2["convert_fan_cuts: one threadgroup<br/>prefix max of cut positions<br/>in chunks of 256 triangles"]
    K1 --> T["triangle t = (v[t+1], v[t+2], hub)<br/>provoking vertex first, same winding"]
    K2 --> T
    T --> D["triangles touching a cut:<br/>three 0xffffffff, nothing drawn"]
    T --> M["Metal: indexed triangle list<br/>of 32-bit converted indices"]
    D --> M