%% one region of a sampler feedback map, from shader write to decode.
flowchart TD
    PS["Pixel shader<br/>WriteSamplerFeedback(uv)"] --> BITS["64 bits for the region:<br/>4 per mip (self, +x, +y, +x+y)"]
    BITS -->|"mips 0-7"| LO["low word at (2x, y)<br/>32-bit atomic OR"]
    BITS -->|"mips 8-15"| HI["high word at (2x+1, y)<br/>32-bit atomic OR"]
    LO --> MAP[("R32_UINT map<br/>2W x H")]
    HI --> MAP
    MAP --> RES["ResolveSubresourceRegion<br/>DECODE (compute kernel)"]
    RES --> SCAN["mip 0: self + 3 neighbours<br/>then coarser mips at the corners"]
    SCAN --> OUT["R8_UINT per region:<br/>finest mip, or 0xff"]