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fastmath.cpp File Reference

#include "..\Headers\fastmath.h"
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <wtypes.h>

Compounds
union	FastSqrtUnion
struct	Vec3
Defines
#define	FP_BITS(fp)   (*(DWORD *)&(fp))
#define	FP_ABS_BITS(fp)   (FP_BITS(fp)&0x7FFFFFFF)
#define	FP_SIGN_BIT(fp)   (FP_BITS(fp)&0x80000000)
#define	FP_ONE_BITS   0x3F800000
#define	FP_INV(r, p)
#define	FP_INV2(r, p)
#define	FP_EXP(e, p)
#define	FP_NORM_TO_BYTE(i, p)
Typedefs
typedef FastSqrtUnion	FastSqrtUnion
Functions
unsigned long	FP_NORM_TO_BYTE2 (float p)
unsigned long	FP_NORM_TO_BYTE3 (float p)
void	build_sqrt_table ()
float	fastsqrt (float n)
float	CylTest_CapsFirst (const Vec3 &pt1, const Vec3 &pt2, float lengthsq, float radius_sq, const Vec3 &testpt)
Variables
float	two = 2.0f

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Define Documentation

#define FP_ABS_BITS (  fp    )     (FP_BITS(fp)&0x7FFFFFFF)

#define FP_BITS (  fp    )     (*(DWORD *)&(fp))

#define FP_EXP (  e, p    )

Value: { \ int _i; \ e = -1.44269504f * (float)0x00800000 * (p); \ _i = (int)e + 0x3F800000; \ e = *(float *)&_i; \ }

#define FP_INV (  r, p    )

Value: { \ int _i = 2 * FP_ONE_BITS - *(int *)&(p); \ r = *(float *)&_i; \ r = r * (2.0f - (p) * r); \ }

#define FP_INV2 (  r, p    )

Value: { \ __asm { mov eax,0x7F000000 }; \ __asm { sub eax,dword ptr [p] }; \ __asm { mov dword ptr [r],eax }; \ __asm { fld dword ptr [p] }; \ __asm { fmul dword ptr [r] }; \ __asm { fsubr [two] }; \ __asm { fmul dword ptr [r] }; \ __asm { fstp dword ptr [r] }; \ }

#define FP_NORM_TO_BYTE (  i, p    )

Value: { \ float _n = (p) + 1.0f; \ i = *(int *)&_n; \ if (i >= 0x40000000) i = 0xFF; \ else if (i <=0x3F800000) i = 0; \ else i = ((i) >> 15) & 0xFF; \ }

#define FP_ONE_BITS   0x3F800000

#define FP_SIGN_BIT (  fp    )     (FP_BITS(fp)&0x80000000)

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Typedef Documentation

typedef union FastSqrtUnion FastSqrtUnion

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Function Documentation

float CylTest_CapsFirst (  const Vec3 &    pt1, const Vec3 &    pt2, float    lengthsq, float    radius_sq, const Vec3 &    testpt )

unsigned long FP_NORM_TO_BYTE2 (  float    p )  [inline]

unsigned long FP_NORM_TO_BYTE3 (  float    p )  [inline]

void build_sqrt_table (    )

float fastsqrt (  float    n )  [inline]

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Variable Documentation

float two = 2.0f

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