Bullet Collision Detection & Physics Library
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#include <math.h>
#include <stdlib.h>
#include <float.h>
Go to the source code of this file.
Classes | |
struct | btInfMaskConverter |
struct | btTypedObject |
rudimentary class to provide type info More... | |
Macros | |
#define | BT_BULLET_VERSION 283 |
#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_INFINITY (btInfinityMask.mask) |
#define | BT_DECLARE_ALIGNED_ALLOCATOR() |
#define | SIMD_PI btScalar(3.1415926535897932384626433832795029) |
#define | SIMD_2_PI (btScalar(2.0) * SIMD_PI) |
#define | SIMD_HALF_PI (SIMD_PI * btScalar(0.5)) |
#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)))) /* reciprocal square root */ |
#define | btRecip(x) (btScalar(1.0)/btScalar(x)) |
#define | SIMD_EPSILON FLT_EPSILON |
#define | SIMD_INFINITY FLT_MAX |
#define | BT_ONE 1.0f |
#define | BT_ZERO 0.0f |
#define | BT_TWO 2.0f |
#define | BT_HALF 0.5f |
#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. More... | |
Functions | |
int | btGetVersion () |
int | btGetInfinityMask () |
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. More... | |
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 More... | |
float | btUnswapEndianFloat (unsigned int a) |
void | btSwapEndianDouble (double d, unsigned char *dst) |
double | btUnswapEndianDouble (const unsigned char *src) |
template<typename T > | |
void | btSetZero (T *a, int n) |
btScalar | btLargeDot (const btScalar *a, const btScalar *b, int n) |
btScalar | btNormalizeAngle (btScalar angleInRadians) |
template<typename T > | |
T * | btAlignPointer (T *unalignedPtr, size_t alignment) |
align a pointer to the provided alignment, upwards More... | |
Variables | |
static btInfMaskConverter | btInfinityMask = 0x7F800000 |
#define ATTRIBUTE_ALIGNED128 | ( | a | ) | __declspec (align(128)) a |
Definition at line 66 of file btScalar.h.
#define ATTRIBUTE_ALIGNED16 | ( | a | ) | __declspec(align(16)) a |
Definition at line 64 of file btScalar.h.
#define ATTRIBUTE_ALIGNED64 | ( | a | ) | __declspec(align(64)) a |
Definition at line 65 of file btScalar.h.
#define BT_BULLET_VERSION 283 |
Definition at line 31 of file btScalar.h.
#define BT_DECLARE_ALIGNED_ALLOCATOR | ( | ) |
Definition at line 388 of file btScalar.h.
#define BT_DECLARE_HANDLE | ( | name | ) | typedef struct name##__ { int unused; } *name |
Definition at line 535 of file btScalar.h.
#define BT_HALF 0.5f |
Definition at line 499 of file btScalar.h.
#define BT_INFINITY (btInfinityMask.mask) |
Definition at line 365 of file btScalar.h.
#define BT_LARGE_FLOAT 1e18f |
Definition at line 280 of file btScalar.h.
#define BT_ONE 1.0f |
Definition at line 496 of file btScalar.h.
#define BT_TWO 2.0f |
Definition at line 498 of file btScalar.h.
#define BT_ZERO 0.0f |
Definition at line 497 of file btScalar.h.
#define btAssert | ( | x | ) |
Definition at line 113 of file btScalar.h.
Definition at line 543 of file btScalar.h.
#define btFullAssert | ( | x | ) |
Definition at line 116 of file btScalar.h.
#define btLikely | ( | _c | ) | _c |
Definition at line 118 of file btScalar.h.
Definition at line 484 of file btScalar.h.
#define btRecipSqrt | ( | x | ) | ((btScalar)(btScalar(1.0)/btSqrt(btScalar(x)))) /* reciprocal square root */ |
Definition at line 483 of file btScalar.h.
#define btUnlikely | ( | _c | ) | _c |
Definition at line 119 of file btScalar.h.
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#define SIMD_EPSILON FLT_EPSILON |
Definition at line 494 of file btScalar.h.
#define SIMD_FORCE_INLINE __forceinline |
Definition at line 63 of file btScalar.h.
Definition at line 478 of file btScalar.h.
#define SIMD_INFINITY FLT_MAX |
Definition at line 495 of file btScalar.h.
#define SIMD_PI btScalar(3.1415926535897932384626433832795029) |
Definition at line 476 of file btScalar.h.
Definition at line 479 of file btScalar.h.
#define SIMDSQRT12 btScalar(0.7071067811865475244008443621048490) |
Definition at line 481 of file btScalar.h.
typedef float btScalar |
The btScalar type abstracts floating point numbers, to easily switch between double and single floating point precision.
Definition at line 278 of file btScalar.h.
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T* btAlignPointer | ( | T * | unalignedPtr, |
size_t | alignment | ||
) |
align a pointer to the provided alignment, upwards
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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
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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
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