struct VertexOutput {
    [[location(0)]] tex_coord: vec2<f32>;
    [[builtin(position)]] position: vec4<f32>;
};

[[group(0), binding(1)]]
var r_color: texture_2d<u32>;

[[stage(fragment)]]
fn fs_main(in: VertexOutput) -> [[location(0)]] vec4<f32> {
    let tex = textureLoad(r_color, vec2<i32>(in.tex_coord * 256.0), 0);
    let v = f32(tex.x) / 255.0;
    return vec4<f32>(1.0 - (v * 5.0), 1.0 - (v * 15.0), 1.0 - (v * 50.0), 1.0);
}