sugarloaf 0.2.6

Sugarloaf is Rio rendering engine, designed to be multiplatform. It is based on WebGPU, Rust library for Desktops and WebAssembly for Web (JavaScript). This project is created and maintained for Rio terminal purposes but feel free to use it.
Documentation 
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// This code was originally retired from iced-rs, which is licensed
// under MIT license https://github.com/iced-rs/iced/blob/master/LICENSE
// The code has suffered changes to fit on Sugarloaf architecture.

struct SolidVertexInput {
    @builtin(vertex_index) vertex_index: u32,
    @location(0) color: vec4<f32>,
    @location(1) pos: vec2<f32>,
    @location(2) scale: vec2<f32>,
    @location(3) border_color: vec4<f32>,
    @location(4) border_radius: vec4<f32>,
    @location(5) border_width: f32,
    @location(6) shadow_color: vec4<f32>,
    @location(7) shadow_offset: vec2<f32>,
    @location(8) shadow_blur_radius: f32,
}

struct SolidVertexOutput {
    @builtin(position) position: vec4<f32>,
    @location(0) color: vec4<f32>,
    @location(1) border_color: vec4<f32>,
    @location(2) pos: vec2<f32>,
    @location(3) scale: vec2<f32>,
    @location(4) border_radius: vec4<f32>,
    @location(5) border_width: f32,
    @location(6) shadow_color: vec4<f32>,
    @location(7) shadow_offset: vec2<f32>,
    @location(8) shadow_blur_radius: f32,
}

@vertex
fn composed_quad_vs_main(input: SolidVertexInput) -> SolidVertexOutput {
    var out: SolidVertexOutput;

    var pos: vec2<f32> = (input.pos + min(input.shadow_offset, vec2<f32>(0.0, 0.0)) - input.shadow_blur_radius) * globals.scale;
    var scale: vec2<f32> = (input.scale + vec2<f32>(abs(input.shadow_offset.x), abs(input.shadow_offset.y)) + input.shadow_blur_radius * 2.0) * globals.scale;
    var snap: vec2<f32> = vec2<f32>(0.0, 0.0);

    if input.scale.x == 1.0 {
        snap.x = round(pos.x) - pos.x;
    }

    if input.scale.y == 1.0 {
        snap.y = round(pos.y) - pos.y;
    }

    var min_border_radius = min(input.scale.x, input.scale.y) * 0.5;
    var border_radius: vec4<f32> = vec4<f32>(
        min(input.border_radius.x, min_border_radius),
        min(input.border_radius.y, min_border_radius),
        min(input.border_radius.z, min_border_radius),
        min(input.border_radius.w, min_border_radius)
    );

    var transform: mat4x4<f32> = mat4x4<f32>(
        vec4<f32>(scale.x + 1.0, 0.0, 0.0, 0.0),
        vec4<f32>(0.0, scale.y + 1.0, 0.0, 0.0),
        vec4<f32>(0.0, 0.0, 1.0, 0.0),
        vec4<f32>(pos - vec2<f32>(0.5, 0.5) + snap, 0.0, 1.0)
    );

    out.position = globals.transform * transform * vec4<f32>(vertex_position(input.vertex_index), 0.0, 1.0);
    out.color = input.color;
    out.border_color = input.border_color;
    out.pos = input.pos * globals.scale + snap;
    out.scale = input.scale * globals.scale;
    out.border_radius = border_radius * globals.scale;
    out.border_width = input.border_width * globals.scale;
    out.shadow_color = input.shadow_color;
    out.shadow_offset = input.shadow_offset * globals.scale;
    out.shadow_blur_radius = input.shadow_blur_radius * globals.scale;

    return out;
}

@fragment
fn composed_quad_fs_main(
    input: SolidVertexOutput
) -> @location(0) vec4<f32> {
    var mixed_color: vec4<f32> = input.color;

    var border_radius = select_border_radius(
        input.border_radius,
        input.position.xy,
        (input.pos + input.scale * 0.5).xy
    );

    if (input.border_width > 0.0) {
        var internal_border: f32 = max(border_radius - input.border_width, 0.0);

        var internal_distance: f32 = distance_alg(
            input.position.xy,
            input.pos + vec2<f32>(input.border_width, input.border_width),
            input.scale - vec2<f32>(input.border_width * 2.0, input.border_width * 2.0),
            internal_border
        );

        var border_mix: f32 = smoothstep(
            max(internal_border - 0.5, 0.0),
            internal_border + 0.5,
            internal_distance
        );

        mixed_color = mix(input.color, input.border_color, vec4<f32>(border_mix, border_mix, border_mix, border_mix));
    }

    var dist: f32 = distance_alg(
        vec2<f32>(input.position.x, input.position.y),
        input.pos,
        input.scale,
        border_radius
    );

    var radius_alpha: f32 = 1.0 - smoothstep(
        max(border_radius - 0.5, 0.0),
        border_radius + 0.5,
        dist
    );

    let quad_color = vec4<f32>(mixed_color.x, mixed_color.y, mixed_color.z, mixed_color.w * radius_alpha);

    if input.shadow_color.a > 0.0 {
        let shadow_radius = select_border_radius(
            input.border_radius,
            input.position.xy - input.shadow_offset,
            (input.pos + input.scale * 0.5).xy
        );
        let shadow_distance = max(rounded_box_sdf(input.position.xy - input.pos - input.shadow_offset - (input.scale / 2.0), input.scale / 2.0, shadow_radius), 0.);
        
        let shadow_alpha = 1.0 - smoothstep(-input.shadow_blur_radius, input.shadow_blur_radius, shadow_distance);
        let shadow_color = input.shadow_color;
        let base_color = mix(
            vec4<f32>(shadow_color.x, shadow_color.y, shadow_color.z, 0.0),
            quad_color,
            quad_color.a
        );

        return mix(base_color, shadow_color, (1.0 - radius_alpha) * shadow_alpha);
    } else {
        return quad_color;
    }
}