gfloat.h

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/**********************************************************************
 *<
    FILE: gfloat

    DESCRIPTION: Single Precision Floating Point Routines

    CREATED BY: Don Brittain & Dan Silva

    HISTORY:

 *> Copyright (c) 1994, All Rights Reserved.
 **********************************************************************/

#pragma once

// if on Intel, and not compiling managed code, use assembly language
#undef __USE_ASM_CODE_

#ifndef _MANAGED
    #ifdef _M_IX86
        #define __USE_ASM_CODE_
    #else
        #include <math.h>
    #endif
#endif

//-------------------------------------------------------------------------------
// Single precision floating point stuff...
//
inline void SinCos (float angle, float *sine, float *cosine) 
{
#ifdef __USE_ASM_CODE_
    __asm {
        push        ecx
        fld         dword ptr angle
        fsincos
        mov         ecx, dword ptr[cosine]
        fstp        dword ptr [ecx]
        mov         ecx, dword ptr[sine]
        fstp        dword ptr [ecx]
        pop         ecx
    }
#else
    *sine   = (float)sin (angle);
    *cosine = (float)cos (angle);
#endif
}

inline float Sin(float angle)
{
#ifdef __USE_ASM_CODE_
    float s, c;
    SinCos(angle, &s, &c);
    return s;
#else
    return (float)sin((double)angle);
#endif
}

inline float Cos(float angle)
{
#ifdef __USE_ASM_CODE_
    float s, c;
    SinCos(angle, &s, &c);
    return c;
#else
    return (float)cos((double)angle);
#endif
}

inline float Sqrt(float arg)
{
#ifdef __USE_ASM_CODE_
    float ans;
    __asm {
        fld         dword ptr arg
        fsqrt
        fstp        dword ptr [ans]
        }
    return ans;
#else
    return (float)sqrt((double)arg);
#endif
}