%% how one D3D12 draw becomes one Metal draw per active view.
flowchart LR
    A["DrawInstanced / DrawIndexedInstanced /<br/>DispatchMesh / ExecuteIndirect"] --> B{"views = all views,<br/>or mask & views<br/>with masking"}
    B -->|"view 0"| C0["record draw<br/>root words + view word<br/>0 | layer₀ << 16"]
    B -->|"view 1"| C1["record draw<br/>root words + view word<br/>1 | layer₁ << 16"]
    B -->|"..."| C3["record draw<br/>view word<br/>3 | layer₃ << 16"]
    C0 & C1 & C3 --> D["shaders (dxil-spirv patch 0003):<br/>SV_ViewID = word & 0xffff<br/>layer += word >> 16<br/>viewport += 8-bit map[view]<br/>(a literal in the MSL)"]
    D --> E["Metal: one draw per view"]