shader/shared/tile.wgsl

// SPDX-License-Identifier: Apache-2.0 OR MIT OR Unlicense

// Common datatypes for path and tile intermediate info.

struct Path {
    // bounding box in tiles
    bbox: vec4<u32>,
    // offset (in u32's) to tile rectangle
    tiles: u32,
}

struct Tile {
    backdrop: i32,
    // This is used for the count of the number of segments in the
    // tile up to coarse rasterization, and the index afterwards.
    // In the latter variant, the bits are inverted so that tiling
    // can detect whether the tile was allocated; it's best to
    // consider this an enum packed into a u32.
    segment_count_or_ix: u32,
}