Misc.h File Reference

Utility/miscellaneous functions used throughout the library. More...

#include "tgx_config.h"
#include <stdint.h>
#include <math.h>
#include <string.h>

Go to the source code of this file.

Macros
#define	M_PI   3.14159265358979323846
	define Pi in case math.h is not yet included.

Functions
TGX_INLINE uint16_t	tgx::BigEndian16 (uint16_t v)
	little endian / big endian conversion
template<typename T >
TGX_INLINE void	tgx::swap (T &a, T &b)
	Baby let me swap you one more time...
template<typename T >
TGX_INLINE T	tgx::min (const T &a, const T &b)
	Don't know why but faster than fminf() for floats.
template<typename T >
TGX_INLINE T	tgx::max (const T &a, const T &b)
	Don't know why but much faster than fmaxf() for floats.
template<typename T >
TGX_INLINE T	tgx::clamp (const T &v, const T &vmin, const T &vmax)
	Template clamp version.
TGX_INLINE float	tgx::roundfp (const float f)
	Rounding for floats.
TGX_INLINE double	tgx::roundfp (const double f)
	Rounding for doubles.
TGX_INLINE uint32_t	tgx::float_as_uint32 (float f)
	Reinterpret the bits of a float as a uint32_t.
TGX_INLINE float	tgx::uint32_as_float (uint32_t u)
	Reinterpret the bits of a uint32_t as a float.
TGX_INLINE int32_t	tgx::safeMultB (int32_t A, int32_t B)
	Return a value smaller or equal to B such that the multiplication by A is safe (no overflow with int32).
TGX_INLINE float	tgx::fast_inv (float x)
	Fast (approximate) computation of 1/x. More...
TGX_INLINE double	tgx::fast_inv (double x)
	Fast (approximate) computation of 1/x. More...
TGX_INLINE float	tgx::precise_sqrt (float x)
	Compute the square root of a float (exact computation).
TGX_INLINE double	tgx::precise_sqrt (double x)
	Compute the square root of a double (exact computation).
TGX_INLINE float	tgx::fast_sqrt (float x)
	Compute a fast approximation of the square root of a float. More...
TGX_INLINE double	tgx::fast_sqrt (double x)
	Compute a fast approximation of the square root of a double.
TGX_INLINE float	tgx::precise_invsqrt (float x)
	Compute the inverse square root of a float (exact computation). More...
TGX_INLINE double	tgx::precise_invsqrt (double x)
	Compute the inverse square root of a double (exact computation).
TGX_INLINE float	tgx::fast_invsqrt (float x)
	Compute a fast approximation of the inverse square root of a float. More...
TGX_INLINE double	tgx::fast_invsqrt (double x)
	Compute a fast approximation of the inverse square root of a float.
TGX_INLINE int32_t	tgx::lfloorf (float x)
	Compute (int32_t)floorf(x). More...

Detailed Description

Utility/miscellaneous functions used throughout the library.

Function Documentation

fast_inv() [1/2]

TGX_INLINE float tgx::fast_inv ( float  x )

inline

Fast (approximate) computation of 1/x.

Version for float.

Credit Ken Cooke (@joestash)

fast_inv() [2/2]

TGX_INLINE double tgx::fast_inv ( double  x )

inline

Fast (approximate) computation of 1/x.

Version for double.

fast_sqrt()

TGX_INLINE float tgx::fast_sqrt ( float  x )

inline

Compute a fast approximation of the square root of a float.

Credit Ken Cooke (@joestash)

precise_invsqrt()

TGX_INLINE float tgx::precise_invsqrt ( float  x )

inline

Compute the inverse square root of a float (exact computation).

Credit Ken Cooke (@joestash)

fast_invsqrt()

TGX_INLINE float tgx::fast_invsqrt ( float  x )

inline

Compute a fast approximation of the inverse square root of a float.

Credit Ken Cooke (@joestash)

lfloorf()

TGX_INLINE int32_t tgx::lfloorf ( float  x )

inline

Compute (int32_t)floorf(x).

Credit Ken Cooke (@joestash)