Shipwright/soh/src/code/sys_math.c

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#include "global.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;
}
f32 Math_SinF(f32 angle) {
return sins((s16)(angle * (32767.0f / M_PI))) * SHT_MINV;
}
f32 Math_CosF(f32 angle) {
return coss((s16)(angle * (32767.0f / M_PI))) * SHT_MINV;
}