flowchart TD
    A["D3D12 draw with a<br/>geometry shader"] --> B["1. vertex shader, drawn as points<br/>rasterization off<br/>writes vertex records"]
    B --> C["barrier vertex → object"]
    C --> D["2. geometry shader as object function<br/>one thread per primitive × GS instance<br/>fixed slots: maxvertexcount records"]
    D --> E["index slots prefilled 0xFFFFFFFF<br/>RestartStrip writes a restart"]
    E --> F["barrier object → vertex"]
    F --> G["3. indexed strip draw over all slots<br/>mtl12_gs_vertex returns records[id]<br/>restart index cuts the strip"]
    G --> H["fragment shader,<br/>render_target_array_index<br/>relative to the RTV's first slice"]