ref: 22d4a10cb61566c0b696fd6accbad2a31a87358c
dir: /src/asm/math.c/
/* * Fixedpoint math routines */ #include <math.h> #include <stdio.h> #include "types.h" #include "asm/mymath.h" #include "asm/symbol.h" #define fix2double(i) ((double)(i/65536.0)) #define double2fix(d) ((SLONG)(d*65536.0)) #ifndef PI #define PI (acos(-1)) #endif /* * Define the _PI symbol */ void math_DefinePI(void) { sym_AddEqu("_PI", double2fix(PI)); } /* * Print a fixed point value */ void math_Print(SLONG i) { if (i >= 0) printf("%ld.%05ld", i >> 16, ((SLONG) (fix2double(i) * 100000 + 0.5)) % 100000); else printf("-%ld.%05ld", (-i) >> 16, ((SLONG) (fix2double(-i) * 100000 + 0.5)) % 100000); } /* * Calculate sine */ SLONG math_Sin(SLONG i) { return (double2fix(sin(fix2double(i) * 2 * PI / 65536))); } /* * Calculate cosine */ SLONG math_Cos(SLONG i) { return (double2fix(cos(fix2double(i) * 2 * PI / 65536))); } /* * Calculate tangent */ SLONG math_Tan(SLONG i) { return (double2fix(tan(fix2double(i) * 2 * PI / 65536))); } /* * Calculate arcsine */ SLONG math_ASin(SLONG i) { return (double2fix(asin(fix2double(i)) / 2 / PI * 65536)); } /* * Calculate arccosine */ SLONG math_ACos(SLONG i) { return (double2fix(acos(fix2double(i)) / 2 / PI * 65536)); } /* * Calculate arctangent */ SLONG math_ATan(SLONG i) { return (double2fix(atan(fix2double(i)) / 2 / PI * 65536)); } /* * Calculate atan2 */ SLONG math_ATan2(SLONG i, SLONG j) { return (double2fix (atan2(fix2double(i), fix2double(j)) / 2 / PI * 65536)); } /* * Multiplication */ SLONG math_Mul(SLONG i, SLONG j) { return (double2fix(fix2double(i) * fix2double(j))); } /* * Division */ SLONG math_Div(SLONG i, SLONG j) { return (double2fix(fix2double(i) / fix2double(j))); } /* * Round */ SLONG math_Round(SLONG i) { return double2fix(round(fix2double(i))); } /* * Ceil */ SLONG math_Ceil(SLONG i) { return double2fix(ceil(fix2double(i))); } /* * Floor */ SLONG math_Floor(SLONG i) { return double2fix(floor(fix2double(i))); }