// Matches `GlyphEntry::IS_COLORED`.
const COLORED: u32 = 1u;

struct GlyphInfo {
    uv_min: vec2<f32>,
    uv_max: vec2<f32>,
    // Which layer of the atlas array this glyph's page is.
    layer: u32,
    color: u32,
    flags: u32,
}

@group(1) @binding(0)
var<storage> glyphs: array<GlyphInfo>;

@fragment
fn fs_main(in: VertexOutput) -> @location(0) vec4<f32> {
    let g = glyphs[in.idx];
    let uv = mix(g.uv_min, g.uv_max, in.uv);
    let texel = textureSample(atlas, samp, uv, i32(g.layer));
    if (g.flags & COLORED) != 0u {
        return masked(in, texel);
    }
    var color = unpack4x8unorm(g.color);
    color.a *= texel.a;
    return masked(in, color);
}