var positions: array<vec2<f32>, 6> = array<vec2<f32>, 6>(
    vec2<f32>(-1.0, 1.0),
    vec2<f32>(-1.0, -1.0),
    vec2<f32>(1.0, -1.0),
    vec2<f32>(-1.0, 1.0),
    vec2<f32>(1.0, 1.0),
    vec2<f32>(1.0, -1.0)
);

var uvs: array<vec2<f32>, 6> = array<vec2<f32>, 6>(
    vec2<f32>(0.0, 0.0),
    vec2<f32>(0.0, 1.0),
    vec2<f32>(1.0, 1.0),
    vec2<f32>(0.0, 0.0),
    vec2<f32>(1.0, 0.0),
    vec2<f32>(1.0, 1.0)
);

[[group(0), binding(0)]] var u_sampler: sampler;
[[group(1), binding(0)]] var u_texture: texture_2d<f32>;

struct VertexInput {
    [[builtin(vertex_index)]] vertex_index: u32;
};

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

[[stage(vertex)]]
fn vs_main(input: VertexInput) -> VertexOutput {
    var out: VertexOutput;
    out.uv = uvs[input.vertex_index];
    out.position = vec4<f32>(positions[input.vertex_index], 0.0, 1.0);

    return out;
}

[[stage(fragment)]]
fn fs_main(input: VertexOutput) -> [[location(0)]] vec4<f32> {
    return textureSample(u_texture, u_sampler, input.uv);
}