flowchart TD
    V["vertex, domain or geometry shader<br/>writes SV_CullDistance"] --> Q{"pixel shader?"}
    Q -->|yes| A["application pixel shader<br/>DXIL to SPIR-V (dxil-spirv)"]
    Q -->|"no (before: ignored, fixme)"| E["empty fragment module<br/>32 hand-written SPIR-V words"]
    A --> M["SPIR-V to MSL (SPIRV-Cross)<br/>patch 0008: recover each distance at the 3 vertices,<br/>discard if one is negative at all of them<br/>patch 0045: keep declared but unread inputs"]
    E --> M
    M --> R["Metal pipeline<br/>no app pixel shader: colour writes masked"]