ncollide3d/utils/
sort.rs

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
// FIXME: do this out-of-place?

/// Sorts two values in increasing order.
#[inline]
pub fn sort2<'a, N: PartialOrd>(a: &'a N, b: &'a N) -> (&'a N, &'a N) {
    if *a <= *b {
        (a, b)
    } else {
        (b, a)
    }
}

/// Sorts a set of three values in increasing order.
#[inline]
pub fn sort3<'a, N: PartialOrd>(a: &'a N, b: &'a N, c: &'a N) -> (&'a N, &'a N, &'a N) {
    let a_b = *a > *b;
    let a_c = *a > *c;
    let b_c = *b > *c;

    let sa;
    let sb;
    let sc;

    // Sort the three values.
    // FIXME: move this to the utilities?
    if a_b {
        // a > b
        if a_c {
            // a > c
            sc = a;

            if b_c {
                // b > c
                sa = c;
                sb = b;
            } else {
                // b <= c
                sa = b;
                sb = c;
            }
        } else {
            // a <= c
            sa = b;
            sb = a;
            sc = c;
        }
    } else {
        // a < b
        if !a_c {
            // a <= c
            sa = a;

            if b_c {
                // b > c
                sb = c;
                sc = b;
            } else {
                sb = b;
                sc = c;
            }
        } else {
            // a > c
            sa = c;
            sb = a;
            sc = b;
        }
    }

    (sa, sb, sc)
}