vert 0.1.1

The 51th Rust Game Engine, to write the 6th Game in Rust
Documentation 
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struct VertexOutput {
    @location(0) uv: vec2<f32>,
    @builtin(position) clip_position: vec4<f32>,
};

@vertex
fn vs_main(
    @builtin(vertex_index) vi: u32,
) -> VertexOutput {
    var out: VertexOutput;
    // Generate a triangle that covers the whole screen
    out.uv = vec2<f32>(
        f32((vi << 1u) & 2u),
        f32(vi & 2u),
    );
    out.clip_position = vec4<f32>(out.uv * 2.0 - 1.0, 0.0, 1.0);
    // We need to invert the y coordinate so the image
    // is not upside down
    out.uv.y = 1.0 - out.uv.y;
    return out;
}