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96 lines
1.3 KiB
C
96 lines
1.3 KiB
C
/* Rocket Forces
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* Filename: mymath.h
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* Version 0.1
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* Copyright (c) Serial 2007
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*/
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extern "C" int _fltused = 0;
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#define M_PI 3.14159265358979323846
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inline double sin(double x)
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{
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__asm fld x
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__asm fsin
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}
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inline double cos(double x)
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{
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__asm fld x
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__asm fcos
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}
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inline double sqrt(double x)
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{
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__asm fld x
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__asm fsqrt
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}
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inline double acos(double x)
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{
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__asm fld x
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__asm fld st(0)
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__asm fmul st,st(1)
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__asm fld1
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__asm fsubrp st(1),st(0)
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__asm fsqrt
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__asm fxch st(1)
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__asm fpatan
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}
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inline double atan(double x)
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{
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double res = acos(1 / sqrt(1 + x * x));
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if (x < 0)
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{
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res *= -1;
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}
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return res;
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}
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inline int round_int(double x)
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{
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int i;
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static const float round_to_nearest = 0.5f;
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__asm
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{
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fld x
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fadd st, st(0)
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fadd round_to_nearest
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fistp i
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sar i, 1
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}
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return i;
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}
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inline int floor_int(double x)
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{
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int i;
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static const float round_toward_m_i = -0.5f;
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__asm
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{
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fld x
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fadd st, st (0)
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fadd round_toward_m_i
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fistp i
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sar i, 1
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}
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return i;
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}
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inline int ceil_int(double x)
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{
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int i;
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static const float round_toward_p_i = -0.5f;
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__asm
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{
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fld x
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fadd st, st (0)
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fsubr round_toward_p_i
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fistp i
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sar i, 1
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}
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return (-i);
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}
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