struct Out {
  @builtin(position) pos: vec4f,
  @location(0) cell: f32,
}

@binding(0) @group(0) var<uniform> size: vec2u;

@vertex
fn main(@builtin(instance_index) i: u32, @location(0) cell: u32, @location(1) pos: vec2u) -> Out {
  let w = size.x;
  let h = size.y;
  let x = (f32(i % w + pos.x) / f32(w) - 0.5) * 2. * f32(w) / f32(max(w, h));
  let y = (f32((i - (i % w)) / w + pos.y) / f32(h) - 0.5) * 2. * f32(h) / f32(max(w, h));

  return Out(vec4f(x, y, 0., 1.), f32(cell));
}