gim_math.h File Reference

#include "LinearMath/btScalar.h"

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Defines
#define	G_DEGTORAD(X) ((X)*3.1415926f/180.0f)
#define	G_EPSILON SIMD_EPSILON
#define	G_HALF_PI 1.5707963f
#define	G_PI 3.14159265358979f
#define	G_RADTODEG(X) ((X)*180.0f/3.1415926f)
#define	G_REAL_INFINITY FLT_MAX
#define	G_ROOT2 1.41421f
#define	G_ROOT3 1.73205f
#define	G_SIGN_BITMASK 0x80000000
#define	G_TWO_PI 6.28318530f
#define	G_UINT_INFINITY 0xffffffff
	A very very high value.
#define	GIM_AIR(x) (GIM_IR(x)&0x7fffffff)
	Absolute integer representation of a floating-point value.
#define	GIM_CLAMP(number, minval, maxval) (number<minval?minval:(number>maxval?maxval:number))
	returns a clamped number
#define	GIM_FR(x) ((GREAL&)(x))
	Floating-point representation of an integer value.
#define	GIM_GREATER(x, y) btFabs(x) > (y)
#define	GIM_INV_SQRT(va, isva)
#define	GIM_IR(x) ((GUINT&)(x))
	Integer representation of a floating-point value.
#define	GIM_IS_NEGATIVE(value) (value <= -G_EPSILON)
#define	GIM_IS_POSISITVE(value) (value >= G_EPSILON)
#define	GIM_IS_ZERO(value) (value < G_EPSILON && value > -G_EPSILON)
#define	GIM_MAX(a, b) (a<b?b:a)
#define	GIM_MAX3(a, b, c) GIM_MAX(a,GIM_MAX(b,c))
#define	GIM_MIN(a, b) (a>b?b:a)
#define	GIM_MIN3(a, b, c) GIM_MIN(a,GIM_MIN(b,c))
#define	GIM_NEAR_EQUAL(v1, v2) GIM_IS_ZERO((v1-v2))
#define	GIM_SIR(x) ((GINT&)(x))
	Signed integer representation of a floating-point value.
#define	GIM_SQRT(va, sva)
#define	GIM_SWAP_NUMBERS(a, b)
	Swap numbers.
#define	GINT int
#define	GINT64 long long
#define	GREAL btScalar
#define	GREAL2 double
#define	GSHORT short
#define	GUINT unsigned int
#define	GUINT64 unsigned long long
#define	GUSHORT unsigned short
Enumerations
enum	GIM_SCALAR_TYPES { G_STYPE_REAL = 0, G_STYPE_REAL2, G_STYPE_SHORT, G_STYPE_USHORT, G_STYPE_INT, G_STYPE_UINT, G_STYPE_INT64, G_STYPE_UINT64 }
Functions
GREAL	gim_inv_sqrt (GREAL f)
	Computes 1.0f / sqrtf(x). Comes from Quake3. See http://www.magic-software.com/3DGEDInvSqrt.html.
GREAL	gim_sqrt (GREAL f)

Detailed Description

Author:: Francisco Len N�jera

Definition in file gim_math.h.

Define Documentation

#define G_DEGTORAD ( X ) ((X)*3.1415926f/180.0f)

Definition at line 78 of file gim_math.h.

#define G_EPSILON SIMD_EPSILON

Definition at line 60 of file gim_math.h.

#define G_HALF_PI 1.5707963f

Definition at line 51 of file gim_math.h.

#define G_PI 3.14159265358979f

Definition at line 50 of file gim_math.h.

#define G_RADTODEG ( X ) ((X)*180.0f/3.1415926f)

Definition at line 79 of file gim_math.h.

#define G_REAL_INFINITY FLT_MAX

Definition at line 58 of file gim_math.h.

#define G_ROOT2 1.41421f

Definition at line 56 of file gim_math.h.

#define G_ROOT3 1.73205f

Definition at line 55 of file gim_math.h.

#define G_SIGN_BITMASK 0x80000000

Definition at line 59 of file gim_math.h.

#define G_TWO_PI 6.28318530f

Definition at line 53 of file gim_math.h.

#define G_UINT_INFINITY 0xffffffff

A very very high value.

Definition at line 57 of file gim_math.h.

#define GIM_AIR ( x ) (GIM_IR(x)&0x7fffffff)

Absolute integer representation of a floating-point value.

Definition at line 88 of file gim_math.h.

#define GIM_CLAMP	(	number,
		minval,
		maxval	)	(number<minval?minval:(number>maxval?maxval:number))

returns a clamped number

Definition at line 108 of file gim_math.h.

#define GIM_FR ( x ) ((GREAL&)(x))

Floating-point representation of an integer value.

Definition at line 91 of file gim_math.h.

#define GIM_GREATER	(	x,
		y		)	btFabs(x) > (y)

Definition at line 110 of file gim_math.h.

#define GIM_INV_SQRT	(	va,
		isva		)

Value:

{\
    if(va<=0.0000001f)\
    {\
        isva = G_REAL_INFINITY;\
    }\
    else\
    {\
        GREAL _x = va * 0.5f;\
        GUINT _y = 0x5f3759df - ( GIM_IR(va) >> 1);\
        isva = GIM_FR(_y);\
        isva  = isva * ( 1.5f - ( _x * isva * isva ) );\
    }\
}\

Definition at line 119 of file gim_math.h.

#define GIM_IR ( x ) ((GUINT&)(x))

Integer representation of a floating-point value.

Definition at line 82 of file gim_math.h.

#define GIM_IS_NEGATIVE ( value ) (value <= -G_EPSILON)

Definition at line 101 of file gim_math.h.

#define GIM_IS_POSISITVE ( value ) (value >= G_EPSILON)

Definition at line 103 of file gim_math.h.

#define GIM_IS_ZERO ( value ) (value < G_EPSILON && value > -G_EPSILON)

Definition at line 99 of file gim_math.h.

#define GIM_MAX	(	a,
		b		)	(a<b?b:a)

Definition at line 93 of file gim_math.h.

#define GIM_MAX3	(	a,
		b,
		c	)	GIM_MAX(a,GIM_MAX(b,c))

Definition at line 96 of file gim_math.h.

#define GIM_MIN	(	a,
		b		)	(a>b?b:a)

Definition at line 94 of file gim_math.h.

#define GIM_MIN3	(	a,
		b,
		c	)	GIM_MIN(a,GIM_MIN(b,c))

Definition at line 97 of file gim_math.h.

#define GIM_NEAR_EQUAL	(	v1,
		v2		)	GIM_IS_ZERO((v1-v2))

Definition at line 105 of file gim_math.h.

#define GIM_SIR ( x ) ((GINT&)(x))

Signed integer representation of a floating-point value.

Definition at line 85 of file gim_math.h.

#define GIM_SQRT	(	va,
		sva		)

Value:

{\
    GIM_INV_SQRT(va,sva);\
    sva = 1.0f/sva;\
}\

Definition at line 134 of file gim_math.h.

#define GIM_SWAP_NUMBERS	(	a,
		b		)

Value:

{ \
    a = a+b; \
    b = a-b; \
    a = a-b; \
}\

Swap numbers.

Definition at line 113 of file gim_math.h.

#define GINT int

Definition at line 41 of file gim_math.h.

#define GINT64 long long

Definition at line 45 of file gim_math.h.

#define GREAL btScalar

Definition at line 39 of file gim_math.h.

#define GREAL2 double

Definition at line 40 of file gim_math.h.

#define GSHORT short

Definition at line 43 of file gim_math.h.

#define GUINT unsigned int

Definition at line 42 of file gim_math.h.

#define GUINT64 unsigned long long

Definition at line 46 of file gim_math.h.

#define GUSHORT unsigned short

Definition at line 44 of file gim_math.h.

Enumeration Type Documentation

enum GIM_SCALAR_TYPES

Enumerator:

G_STYPE_REAL
G_STYPE_REAL2
G_STYPE_SHORT
G_STYPE_USHORT
G_STYPE_INT
G_STYPE_UINT
G_STYPE_INT64
G_STYPE_UINT64

Definition at line 64 of file gim_math.h.

Function Documentation

GREAL gim_inv_sqrt ( GREAL f ) [inline]

Computes 1.0f / sqrtf(x). Comes from Quake3. See http://www.magic-software.com/3DGEDInvSqrt.html.

Definition at line 141 of file gim_math.h.

GREAL gim_sqrt ( GREAL f ) [inline]

Definition at line 148 of file gim_math.h.

gim_math.h File Reference

Defines

Enumerations

Functions

Detailed Description

Define Documentation

Enumeration Type Documentation

Function Documentation