fastmath.cpp File Reference

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

Go to the source code of this file.

Classes
union	FastSqrtUnion
struct	Vec3

Macros
#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	__forceinline   inline
#define	FP_INV(r, p)
#define	FP_INV2(r, p)
#define	FP_EXP(e, p)
#define	FP_NORM_TO_BYTE(i, p)

Typedefs
typedef int	DWORD
typedef union 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)
__forceinline void	FloatToInt (int *int_pointer, float f)
int	Stupodmain (int argc, char *argv[])
float	CylTest_CapsFirst (const Vec3 &pt1, const Vec3 &pt2, float lengthsq, float radius_sq, const Vec3 &testpt)

Variables
float	two = 2.0f

Macro Definition Documentation

#define __forceinline   inline

Definition at line 23 of file fastmath.cpp.

#define FP_ABS_BITS

(

fp)

( (FP_BITS( fp )&0x7FFFFFFF) )

Definition at line 20 of file fastmath.cpp.

#define FP_BITS

(

fp)

( ( *(DWORD*) &(fp) ) )

Definition at line 19 of file fastmath.cpp.

#define FP_EXP	(		e,
			p
	)

Value:

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

Definition at line 59 of file fastmath.cpp.

#define FP_INV	(		r,
			p
	)

Value:

do {                                     \
        int _i = 2*FP_ONE_BITS-*(int*) &(p); \
        r = *(float*) &_i;                   \
        r = r*(2.0f-(p)*r);                  \
    }                                        \
    while (0)

Definition at line 27 of file fastmath.cpp.

#define FP_INV2	(		r,
			p
	)

Value:

do {                               \
        __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]};     \
    }                                  \
    while (0)

Definition at line 44 of file fastmath.cpp.

#define FP_NORM_TO_BYTE	(		i,
			p
	)

Value:

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

Definition at line 68 of file fastmath.cpp.

#define FP_ONE_BITS   ( (0x3F800000) )

Definition at line 22 of file fastmath.cpp.

#define FP_SIGN_BIT

(

fp)

( (FP_BITS( fp )&0x80000000) )

Definition at line 21 of file fastmath.cpp.

Typedef Documentation

typedef int DWORD

Definition at line 16 of file fastmath.cpp.

typedef union FastSqrtUnion FastSqrtUnion

Function Documentation

void build_sqrt_table

(

)

Definition at line 98 of file fastmath.cpp.

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

Definition at line 197 of file fastmath.cpp.

float fastsqrt ( float  n)

inline

Definition at line 124 of file fastmath.cpp.

__forceinline void FloatToInt	(	int *	int_pointer,
		float	f
	)

Definition at line 136 of file fastmath.cpp.

unsigned long FP_NORM_TO_BYTE2 ( float  p)

inline

Definition at line 79 of file fastmath.cpp.

unsigned long FP_NORM_TO_BYTE3 ( float  p)

inline

Definition at line 85 of file fastmath.cpp.

int Stupodmain	(	int	argc,
		char *	argv[]
	)

Definition at line 141 of file fastmath.cpp.

Variable Documentation

float two = 2.0f

Definition at line 42 of file fastmath.cpp.