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[[stage(vertex)]] fn main([[builtin(vertex_index)]] in_vertex_index: u32) -> [[builtin(position)]] vec4<f32> { let pos = vec2<f32>(f32((in_vertex_index << 1u) & 2u), f32(in_vertex_index & 2u)); return vec4<f32>(pos * 2.0 - 1.0, 0.0, 1.0); }