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0283493db8
* Doc units of trig functions * "Very simple" yet I made a mistake * sins returns in [-0x7FFF,0x7FFF] as the [-1,1] range * Also `sys_math_atan.c` * Remove `@param`s without descriptions * Add note on Math_Atan2S/F arguments being unlike atan2 * "from (1,0) to (x,y)" -> "from vector ..." * arg names -> `angle` * Improve `@return` comment on atans
55 lines
1 KiB
C
55 lines
1 KiB
C
#include "global.h"
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f32 sFactorialTbl[] = { 1.0f, 1.0f, 2.0f, 6.0f, 24.0f, 120.0f, 720.0f,
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5040.0f, 40320.0f, 362880.0f, 3628800.0f, 39916800.0f, 479001600.0f };
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f32 Math_FactorialF(f32 n) {
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f32 ret = 1.0f;
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s32 i;
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for (i = n; i > 1; i--) {
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ret *= i;
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}
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return ret;
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}
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f32 Math_Factorial(s32 n) {
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f32 ret;
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s32 i;
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if ((u32)n > 12U) {
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ret = sFactorialTbl[12];
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for (i = 13; i <= n; i++) {
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ret *= i;
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}
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} else {
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ret = sFactorialTbl[n];
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}
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return ret;
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}
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f32 Math_PowF(f32 base, s32 exp) {
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f32 ret = 1.0f;
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while (exp > 0) {
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exp--;
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ret *= base;
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}
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return ret;
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}
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/**
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* @param angle radians
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* @return sin(angle)
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*/
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f32 Math_SinF(f32 angle) {
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return sins((s16)(angle * (0x7FFF / M_PI))) * SHT_MINV;
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}
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/**
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* @param angle radians
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* @return cos(angle)
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*/
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f32 Math_CosF(f32 angle) {
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return coss((s16)(angle * (0x7FFF / M_PI))) * SHT_MINV;
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}
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