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
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
|
/**
* Maths library: two factorials, integer power, wrappers for libultra's sins and coss (the main ones used), and some
* random functions moved from OoT's z_actor
*/
#include "global.h"
static f32 sFactorialTbl[] = { 1.0f, 1.0f, 2.0f, 6.0f, 24.0f, 120.0f, 720.0f,
5040.0f, 40320.0f, 362880.0f, 3628800.0f, 39916800.0f, 479001600.0f };
// Rename to Math_FactorialF
/**
* Takes a float, returns the factorial of it(s trunctation), iteratively
* Unused
*/
f32 func_80179300(f32 n) {
f32 ret = 1.0f;
s32 i;
//! @bug No check for negative argument. Will return 1.0f if the argument truncates to a negative int.
for (i = n; i > 1; i--) {
ret *= i;
}
return ret;
}
// Rename to Math_Factorial
/**
* Takes an int and returns its factorial as a float. Uses the lookup table for n <= 12.
* Unused
*/
f32 func_80179400(s32 n) {
f32 ret;
s32 i;
//! @bug No check for negative argument. Will read the array out-of-bounds if the argument is negative.
//! (The OoT version does an unsigned check instead, which will return sFactorialTbl[12] for a negative argument.)
if (n >= ARRAY_COUNT(sFactorialTbl)) {
ret = sFactorialTbl[12];
for (i = 13; i <= n; i++) {
ret *= i;
}
} else {
ret = sFactorialTbl[n];
}
return ret;
}
// Rename to Math_PowF
/**
* Returns base^{exp} if exp is nonnegative and 1.0f otherwise.
* Unused
*/
f32 pow_int(f32 base, s32 exp) {
f32 ret = 1.0f;
while (exp > 0) {
exp--;
ret *= base;
}
return ret;
}
// Rename to Math_SinF
/**
* Takes an angle in radians and returns the sine.
*/
f32 sin_rad(f32 rad) {
return sins(RADF_TO_BINANG(rad)) * SHT_MINV;
}
// Rename to Math_CosF
/**
* Takes an angle in radians and returns the cosine.
*/
f32 cos_rad(f32 rad) {
return coss(RADF_TO_BINANG(rad)) * SHT_MINV;
}
/**
* Returns a pseudo-random floating-point number between 0.0f and scale. Originally in z_actor in OoT.
*/
f32 Rand_ZeroFloat(f32 scale) {
return Rand_ZeroOne() * scale;
}
// Rename to Rand_CenteredFloat
/**
* Returns a pseudo-random floating-point number between (- scale / 2) and (scale / 2). Originally in z_actor in OoT.
*/
f32 randPlusMinusPoint5Scaled(f32 scale) {
return Rand_Centered() * scale;
}
|
