Classes | Defines | Typedefs | Functions

btScalar.h File Reference

#include <math.h>
#include <stdlib.h>
#include <float.h>
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Classes

struct  btTypedObject
 rudimentary class to provide type info More...

Defines

#define BT_BULLET_VERSION   281
#define SIMD_FORCE_INLINE   __forceinline
#define ATTRIBUTE_ALIGNED16(a)   __declspec(align(16)) a
#define ATTRIBUTE_ALIGNED64(a)   __declspec(align(64)) a
#define ATTRIBUTE_ALIGNED128(a)   __declspec (align(128)) a
#define btAssert(x)
#define btFullAssert(x)
#define btLikely(_c)   _c
#define btUnlikely(_c)   _c
#define BT_LARGE_FLOAT   1e18f
#define BT_DECLARE_ALIGNED_ALLOCATOR()
#define SIMD_2_PI   btScalar(6.283185307179586232)
#define SIMD_PI   (SIMD_2_PI * btScalar(0.5))
#define SIMD_HALF_PI   (SIMD_2_PI * btScalar(0.25))
#define SIMD_RADS_PER_DEG   (SIMD_2_PI / btScalar(360.0))
#define SIMD_DEGS_PER_RAD   (btScalar(360.0) / SIMD_2_PI)
#define SIMDSQRT12   btScalar(0.7071067811865475244008443621048490)
#define btRecipSqrt(x)   ((btScalar)(btScalar(1.0)/btSqrt(btScalar(x))))
#define SIMD_EPSILON   FLT_EPSILON
#define SIMD_INFINITY   FLT_MAX
#define BT_DECLARE_HANDLE(name)   typedef struct name##__ { int unused; } *name
#define btFsels(a, b, c)   (btScalar)btFsel(a,b,c)

Typedefs

typedef float btScalar
 The btScalar type abstracts floating point numbers, to easily switch between double and single floating point precision.

Functions

int btGetVersion ()
btScalar btSqrt (btScalar y)
btScalar btFabs (btScalar x)
btScalar btCos (btScalar x)
btScalar btSin (btScalar x)
btScalar btTan (btScalar x)
btScalar btAcos (btScalar x)
btScalar btAsin (btScalar x)
btScalar btAtan (btScalar x)
btScalar btAtan2 (btScalar x, btScalar y)
btScalar btExp (btScalar x)
btScalar btLog (btScalar x)
btScalar btPow (btScalar x, btScalar y)
btScalar btFmod (btScalar x, btScalar y)
btScalar btAtan2Fast (btScalar y, btScalar x)
bool btFuzzyZero (btScalar x)
bool btEqual (btScalar a, btScalar eps)
bool btGreaterEqual (btScalar a, btScalar eps)
int btIsNegative (btScalar x)
btScalar btRadians (btScalar x)
btScalar btDegrees (btScalar x)
btScalar btFsel (btScalar a, btScalar b, btScalar c)
bool btMachineIsLittleEndian ()
unsigned btSelect (unsigned condition, unsigned valueIfConditionNonZero, unsigned valueIfConditionZero)
 btSelect avoids branches, which makes performance much better for consoles like Playstation 3 and XBox 360 Thanks Phil Knight.
int btSelect (unsigned condition, int valueIfConditionNonZero, int valueIfConditionZero)
float btSelect (unsigned condition, float valueIfConditionNonZero, float valueIfConditionZero)
template<typename T >
void btSwap (T &a, T &b)
unsigned btSwapEndian (unsigned val)
unsigned short btSwapEndian (unsigned short val)
unsigned btSwapEndian (int val)
unsigned short btSwapEndian (short val)
unsigned int btSwapEndianFloat (float d)
 btSwapFloat uses using char pointers to swap the endianness
float btUnswapEndianFloat (unsigned int a)
void btSwapEndianDouble (double d, unsigned char *dst)
double btUnswapEndianDouble (const unsigned char *src)
btScalar btNormalizeAngle (btScalar angleInRadians)
template<typename T >
T * btAlignPointer (T *unalignedPtr, size_t alignment)
 align a pointer to the provided alignment, upwards

Define Documentation

#define ATTRIBUTE_ALIGNED128 (   a  )     __declspec (align(128)) a

Definition at line 61 of file btScalar.h.

#define ATTRIBUTE_ALIGNED16 (   a  )     __declspec(align(16)) a

Definition at line 59 of file btScalar.h.

#define ATTRIBUTE_ALIGNED64 (   a  )     __declspec(align(64)) a

Definition at line 60 of file btScalar.h.

#define BT_BULLET_VERSION   281

Definition at line 31 of file btScalar.h.

#define BT_DECLARE_ALIGNED_ALLOCATOR (  ) 
Value:
SIMD_FORCE_INLINE void* operator new(size_t sizeInBytes)   { return btAlignedAlloc(sizeInBytes,16); }   \
   SIMD_FORCE_INLINE void  operator delete(void* ptr)         { btAlignedFree(ptr); }   \
   SIMD_FORCE_INLINE void* operator new(size_t, void* ptr)   { return ptr; }   \
   SIMD_FORCE_INLINE void  operator delete(void*, void*)      { }   \
   SIMD_FORCE_INLINE void* operator new[](size_t sizeInBytes)   { return btAlignedAlloc(sizeInBytes,16); }   \
   SIMD_FORCE_INLINE void  operator delete[](void* ptr)         { btAlignedFree(ptr); }   \
   SIMD_FORCE_INLINE void* operator new[](size_t, void* ptr)   { return ptr; }   \
   SIMD_FORCE_INLINE void  operator delete[](void*, void*)      { }   \

Definition at line 328 of file btScalar.h.

#define BT_DECLARE_HANDLE (   name  )     typedef struct name##__ { int unused; } *name

Definition at line 456 of file btScalar.h.

#define BT_LARGE_FLOAT   1e18f

Definition at line 260 of file btScalar.h.

#define btAssert (   x  ) 

Definition at line 97 of file btScalar.h.

#define btFsels (   a,
  b,
  c 
)    (btScalar)btFsel(a,b,c)

Definition at line 464 of file btScalar.h.

#define btFullAssert (   x  ) 

Definition at line 100 of file btScalar.h.

#define btLikely (   _c  )     _c

Definition at line 102 of file btScalar.h.

#define btRecipSqrt (   x  )     ((btScalar)(btScalar(1.0)/btSqrt(btScalar(x))))

Definition at line 412 of file btScalar.h.

#define btUnlikely (   _c  )     _c

Definition at line 103 of file btScalar.h.

#define SIMD_2_PI   btScalar(6.283185307179586232)

Definition at line 405 of file btScalar.h.

#define SIMD_DEGS_PER_RAD   (btScalar(360.0) / SIMD_2_PI)

Definition at line 409 of file btScalar.h.

#define SIMD_EPSILON   FLT_EPSILON

Definition at line 419 of file btScalar.h.

#define SIMD_FORCE_INLINE   __forceinline

Definition at line 58 of file btScalar.h.

#define SIMD_HALF_PI   (SIMD_2_PI * btScalar(0.25))

Definition at line 407 of file btScalar.h.

#define SIMD_INFINITY   FLT_MAX

Definition at line 420 of file btScalar.h.

#define SIMD_PI   (SIMD_2_PI * btScalar(0.5))

Definition at line 406 of file btScalar.h.

#define SIMD_RADS_PER_DEG   (SIMD_2_PI / btScalar(360.0))

Definition at line 408 of file btScalar.h.

#define SIMDSQRT12   btScalar(0.7071067811865475244008443621048490)

Definition at line 410 of file btScalar.h.


Typedef Documentation

typedef float btScalar

The btScalar type abstracts floating point numbers, to easily switch between double and single floating point precision.

Definition at line 258 of file btScalar.h.


Function Documentation

btScalar btAcos ( btScalar  x  )  [inline]

Definition at line 382 of file btScalar.h.

template<typename T >
T* btAlignPointer ( T *  unalignedPtr,
size_t  alignment 
)

align a pointer to the provided alignment, upwards

Definition at line 639 of file btScalar.h.

btScalar btAsin ( btScalar  x  )  [inline]

Definition at line 389 of file btScalar.h.

btScalar btAtan ( btScalar  x  )  [inline]

Definition at line 396 of file btScalar.h.

btScalar btAtan2 ( btScalar  x,
btScalar  y 
) [inline]

Definition at line 397 of file btScalar.h.

btScalar btAtan2Fast ( btScalar  y,
btScalar  x 
) [inline]

Definition at line 423 of file btScalar.h.

btScalar btCos ( btScalar  x  )  [inline]

Definition at line 379 of file btScalar.h.

btScalar btDegrees ( btScalar  x  )  [inline]

Definition at line 454 of file btScalar.h.

bool btEqual ( btScalar  a,
btScalar  eps 
) [inline]

Definition at line 441 of file btScalar.h.

btScalar btExp ( btScalar  x  )  [inline]

Definition at line 398 of file btScalar.h.

btScalar btFabs ( btScalar  x  )  [inline]

Definition at line 378 of file btScalar.h.

btScalar btFmod ( btScalar  x,
btScalar  y 
) [inline]

Definition at line 401 of file btScalar.h.

btScalar btFsel ( btScalar  a,
btScalar  b,
btScalar  c 
) [inline]

Definition at line 459 of file btScalar.h.

bool btFuzzyZero ( btScalar  x  )  [inline]

Definition at line 439 of file btScalar.h.

int btGetVersion (  )  [inline]

Definition at line 33 of file btScalar.h.

bool btGreaterEqual ( btScalar  a,
btScalar  eps 
) [inline]

Definition at line 444 of file btScalar.h.

int btIsNegative ( btScalar  x  )  [inline]

Definition at line 449 of file btScalar.h.

btScalar btLog ( btScalar  x  )  [inline]

Definition at line 399 of file btScalar.h.

bool btMachineIsLittleEndian (  )  [inline]

Definition at line 467 of file btScalar.h.

btScalar btNormalizeAngle ( btScalar  angleInRadians  )  [inline]

Definition at line 605 of file btScalar.h.

btScalar btPow ( btScalar  x,
btScalar  y 
) [inline]

Definition at line 400 of file btScalar.h.

btScalar btRadians ( btScalar  x  )  [inline]

Definition at line 453 of file btScalar.h.

int btSelect ( unsigned  condition,
int  valueIfConditionNonZero,
int  valueIfConditionZero 
) [inline]

Definition at line 491 of file btScalar.h.

float btSelect ( unsigned  condition,
float  valueIfConditionNonZero,
float  valueIfConditionZero 
) [inline]

Definition at line 497 of file btScalar.h.

unsigned btSelect ( unsigned  condition,
unsigned  valueIfConditionNonZero,
unsigned  valueIfConditionZero 
) [inline]

btSelect avoids branches, which makes performance much better for consoles like Playstation 3 and XBox 360 Thanks Phil Knight.

See also http://www.cellperformance.com/articles/2006/04/more_techniques_for_eliminatin_1.html

Definition at line 481 of file btScalar.h.

btScalar btSin ( btScalar  x  )  [inline]

Definition at line 380 of file btScalar.h.

btScalar btSqrt ( btScalar  y  )  [inline]

Definition at line 358 of file btScalar.h.

template<typename T >
void btSwap ( T &  a,
T &  b 
) [inline]

Definition at line 506 of file btScalar.h.

unsigned short btSwapEndian ( unsigned short  val  )  [inline]

Definition at line 520 of file btScalar.h.

unsigned btSwapEndian ( int  val  )  [inline]

Definition at line 525 of file btScalar.h.

unsigned short btSwapEndian ( short  val  )  [inline]

Definition at line 530 of file btScalar.h.

unsigned btSwapEndian ( unsigned  val  )  [inline]

Definition at line 515 of file btScalar.h.

void btSwapEndianDouble ( double  d,
unsigned char *  dst 
) [inline]

Definition at line 571 of file btScalar.h.

unsigned int btSwapEndianFloat ( float  d  )  [inline]

btSwapFloat uses using char pointers to swap the endianness

btSwapFloat/btSwapDouble will NOT return a float, because the machine might 'correct' invalid floating point values Not all values of sign/exponent/mantissa are valid floating point numbers according to IEEE 754. When a floating point unit is faced with an invalid value, it may actually change the value, or worse, throw an exception. In most systems, running user mode code, you wouldn't get an exception, but instead the hardware/os/runtime will 'fix' the number for you. so instead of returning a float/double, we return integer/long long integer

Definition at line 541 of file btScalar.h.

btScalar btTan ( btScalar  x  )  [inline]

Definition at line 381 of file btScalar.h.

double btUnswapEndianDouble ( const unsigned char *  src  )  [inline]

Definition at line 587 of file btScalar.h.

float btUnswapEndianFloat ( unsigned int  a  )  [inline]

Definition at line 555 of file btScalar.h.