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oot/src/code/sys_math.c
mzxrules 8d83727429
Experiment: remove global.h dependency from sys_math, sys_math3d, z_lib (#1956)
* split sys_math, sys_math3d, z_lib from global.h

* suggestions

* forgot this

* more math stuff

* nit fix

* re-add ichain.h

* resolve tharo's comments
2024-06-19 00:00:23 -04:00

55 lines
1 KiB
C

#include "sys_math.h"
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 };
f32 Math_FactorialF(f32 n) {
f32 ret = 1.0f;
s32 i;
for (i = n; i > 1; i--) {
ret *= i;
}
return ret;
}
f32 Math_Factorial(s32 n) {
f32 ret;
s32 i;
if ((u32)n > 12U) {
ret = sFactorialTbl[12];
for (i = 13; i <= n; i++) {
ret *= i;
}
} else {
ret = sFactorialTbl[n];
}
return ret;
}
f32 Math_PowF(f32 base, s32 exp) {
f32 ret = 1.0f;
while (exp > 0) {
exp--;
ret *= base;
}
return ret;
}
/**
* @param angle radians
* @return sin(angle)
*/
f32 Math_SinF(f32 angle) {
return sins((s16)(angle * (0x7FFF / M_PI))) * SHT_MINV;
}
/**
* @param angle radians
* @return cos(angle)
*/
f32 Math_CosF(f32 angle) {
return coss((s16)(angle * (0x7FFF / M_PI))) * SHT_MINV;
}