vello/shader/shared/clip.wgsl

// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense
 
struct Bic {
    a: u32,
    b: u32,
}

fn bic_combine(x: Bic, y: Bic) -> Bic {
    let m = min(x.b, y.a);
    return Bic(x.a + y.a - m, x.b + y.b - m);
}

struct ClipInp {
    // Index of the draw object.
    ix: u32,
    // This is a packed encoding of an enum with the sign bit as the tag. If positive,
    // this entry is a BeginClip and contains the associated path index. If negative,
    // it is an EndClip and contains the bitwise-not of the EndClip draw object index.
    path_ix: i32,
}

struct ClipEl {
    parent_ix: u32,
    bbox: vec4<f32>,
}