struct Uniforms {
    resolution: vec2<f32>,   // viewport size (pixels)
    origin: vec2<f32>,       // start point (pixels)

    len0: f32,               // first horizontal segment (to the right)
    len2: f32,               // last horizontal segment (to the right)
    drop: f32,               // vertical drop between segments

    thickness: f32,          // inner half-width
    border: f32,             // border thickness

    border_color: vec4<f32>,
    color_start: vec4<f32>,
    color_end: vec4<f32>,
};

@group(0) @binding(0)
var<uniform> U: Uniforms;

struct VertexOutput {
    @builtin(position) position : vec4<f32>,
    @location(0) uv : vec2<f32>,
};

@fragment
fn fragment(mesh: VertexOutput) -> @location(0) vec4<f32> {
    let u = clamp(mesh.uv.x, 0.0, 1.0);
    return vec4<f32>(mesh.position.x / 1000.0, mesh.position.y / 1000.0, 0.0, 1.0);
}