flowchart LR
    app["CreateSampler2<br/>UINT_BORDER_COLOR c"] --> rec["sampler record<br/>[sampler][white sampler][c as bits]"]
    subgraph ps["shader (SPIRV-Cross patch 0021)"]
        direction TB
        a["a = sample with<br/>transparent-black border"] --> sel["per channel:<br/>a ≠ b ? c : a"]
        b["b = sample with<br/>opaque-white border"] --> sel
    end
    rec --> a
    rec --> b
    sel --> out["uint4 result<br/>texel, or c outside"]
    f["float path:<br/>a + (b − a)·c"] -. "integer results<br/>are point sampled" .-> sel