mathop.h File Reference

Math operations. More...

#include "generic.h"

Go to the source code of this file.

Defines
#define	VL_PI   3.141592653589793
	Pi (math constant).
#define	VL_SINGLE_EPSILON   1.19209290E-07F
	Single precision epsilon (math constant).
#define	VL_DOUBLE_EPSILON   2.220446049250313e-16
	Double precision epsilon (math constant).
Functions
VL_INLINE vl_single	vl_mod_2pi_f (vl_single x)
	Modulo 2 PI.
VL_INLINE vl_double	vl_mod_2pi_d (vl_double x)
	Modulo 2 PI.
VL_INLINE int	vl_floor_f (vl_single x)
	Floor operation ((int) floor(x)).
VL_INLINE int	vl_floor_d (vl_double x)
	Floor operation ((int) floor(x)).
VL_INLINE vl_single	vl_abs_f (vl_single x)
	Fast abs(x).
VL_INLINE vl_double	vl_abs_d (vl_double x)
	Fast abs(x).
VL_INLINE vl_single	vl_fast_atan2_f (vl_single y, vl_single x)
	Fast atan2 approximation.
VL_INLINE vl_double	vl_fast_atan2_d (vl_double y, vl_double x)
	Fast atan2 approximation.
VL_INLINE vl_single	vl_fast_resqrt_f (vl_single x)
	Fast resqrt approximation.
VL_INLINE vl_double	vl_fast_resqrt_d (vl_double x)
	Fast resqrt approximation.
VL_INLINE vl_single	vl_fast_sqrt_f (vl_single x)
	Fast sqrt approximation.
VL_INLINE vl_double	vl_fast_sqrt_d (vl_double x)
	Fast sqrt approximation.

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Detailed Description

Author:

Andrea Vedaldi

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Define Documentation

#define VL_DOUBLE_EPSILON   2.220446049250313e-16

Difference of the smallest representable number greater than 1.0 and 1.0.

#define VL_SINGLE_EPSILON   1.19209290E-07F

Difference of the smallest representable number greater than 1.0 and 1.0.

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Function Documentation

VL_INLINE vl_double vl_abs_d

(

vl_double

x

)

---------------------------------------------------------------

Parameters:

x

argument.

Returns:

abs(x)

VL_INLINE vl_single vl_abs_f

(

vl_single

x

)

---------------------------------------------------------------

Parameters:

x

argument.

Returns:

abs(x)

VL_INLINE vl_double vl_fast_atan2_d	(	vl_double	y,
		vl_double	x
	)

----------------------------------------------------------------

Parameters:

	x	argument.
	y	argument.

Returns:

Approximation of atan2(x).

VL_INLINE vl_single vl_fast_atan2_f	(	vl_single	y,
		vl_single	x
	)

----------------------------------------------------------------

Parameters:

	x	argument.
	y	argument.

Returns:

Approximation of atan2(x).

VL_INLINE vl_double vl_fast_resqrt_d

(

vl_double

x

)

---------------------------------------------------------------

Parameters:

x

argument.

Returns:

Approximation to resqrt(x).

VL_INLINE vl_single vl_fast_resqrt_f

(

vl_single

x

)

---------------------------------------------------------------

Parameters:

x

argument.

Returns:

Approximation to resqrt(x).

VL_INLINE vl_double vl_fast_sqrt_d

(

vl_double

x

)

---------------------------------------------------------------

Parameters:

x

argument.

Returns:

Approximation to sqrt(x).

VL_INLINE vl_single vl_fast_sqrt_f

(

vl_single

x

)

---------------------------------------------------------------

Parameters:

x

argument.

Returns:

Approximation to sqrt(x).

VL_INLINE int vl_floor_d

(

vl_double

x

)

---------------------------------------------------------------

Parameters:

x

argument.

Returns:

(int) floor(x)

VL_INLINE int vl_floor_f

(

vl_single

x

)

---------------------------------------------------------------

Parameters:

x

argument.

Returns:

(int) floor(x)

VL_INLINE vl_double vl_mod_2pi_d

(

vl_double

x

)

---------------------------------------------------------------

The function is optimized for small values of x.

Returns:

mod(x, 2 * VL_PI)

VL_INLINE vl_single vl_mod_2pi_f

(

vl_single

x

)

---------------------------------------------------------------

The function is optimized for small values of x.

Returns:

mod(x, 2 * VL_PI)

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