use std::{
	env::var,
	f32::consts::TAU,
	fs::File,
	io::{Result, Write},
	path::PathBuf
};

fn main() -> Result<()> {
	println!("cargo:rerun-if-changed=build.rs");

	let mut path = PathBuf::from(var("OUT_DIR")
		.expect("Cargo didn't set OUT_DIR"));
	path.push("normals.rs");
	let mut f = File::create(path)?;
	f.write_all(b"[0.0,")?;
	for n in 1..256 {
		write!(f, "{},", (n as f32 / 255.0 * TAU).sin())?;
	}

	f.write_all(b"]")
}