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use std::str::FromStr;
pub fn view_matrix(position: &[f32; 3],
direction: &[f32; 3],
up: &[f32; 3]) -> [[f32; 4]; 4] {
let f = {
let f = direction;
let len = f[0] * f[0] + f[1] * f[1] + f[2] * f[2];
let len = len.sqrt();
[f[0] / len, f[1] / len, f[2] / len]
};
let s = [up[1] * f[2] - up[2] * f[1],
up[2] * f[0] - up[0] * f[2],
up[0] * f[1] - up[1] * f[0]];
let s_norm = {
let len = s[0] * s[0] + s[1] * s[1] + s[2] * s[2];
let len = len.sqrt();
[s[0] / len, s[1] / len, s[2] / len]
};
let u = [f[1] * s_norm[2] - f[2] * s_norm[1],
f[2] * s_norm[0] - f[0] * s_norm[2],
f[0] * s_norm[1] - f[1] * s_norm[0]];
let p = [-position[0] * s_norm[0] - position[1] * s_norm[1] - position[2] * s_norm[2],
-position[0] * u[0] - position[1] * u[1] - position[2] * u[2],
-position[0] * f[0] - position[1] * f[1] - position[2] * f[2]];
[
[s[0], u[0], f[0], 0.0],
[s[1], u[1], f[1], 0.0],
[s[2], u[2], f[2], 0.0],
[p[0], p[1], p[2], 1.0],
]
}
/// This little hacky function converts X-style args like "-root" to standard
/// UNIX long-style args ("--root") that can be parsed by getopts.
///
/// These variant long-form args should probably be hidden from the user, eg
/// not show up in usage or manpage output.
pub fn convert_xscreensaver_args(raw: Vec<&str>) -> Vec<String> {
let known_args = vec!["-root",
"-window",
"-mono",
"-install",
"-noinstall",
"-visual",
"-window-id",
"-fps",
"-no-fps",
"-pair",
"-record-animation"];
let ret: Vec<String> = raw.into_iter().map(|arg| {
if known_args.contains(&arg) {
let mut longer = String::from_str("-").unwrap();
longer.push_str(arg);
longer
} else {
String::from_str(arg).unwrap()
}
}).collect();
ret
}
#[test]
fn test_xargconv() {
assert_eq!(vec!["--root"], convert_xscreensaver_args(vec!["-root"]));
assert_eq!(vec!["--root"], convert_xscreensaver_args(vec!["--root"]));
assert_eq!(vec!["root"], convert_xscreensaver_args(vec!["root"]));
assert_eq!(vec!["-asdf"], convert_xscreensaver_args(vec!["-asdf"]));
assert_eq!(vec!["-h"], convert_xscreensaver_args(vec!["-h"]));
}
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