#include <Box2D/Common/b2Settings.h>
#include <cmath>
#include <cfloat>
#include <cstddef>
#include <limits>
Go to the source code of this file.
Classes | |
struct | b2Vec2 |
A 2D column vector. More... | |
struct | b2Vec3 |
A 2D column vector with 3 elements. More... | |
struct | b2Mat22 |
A 2-by-2 matrix. Stored in column-major order. More... | |
struct | b2Mat33 |
A 3-by-3 matrix. Stored in column-major order. More... | |
struct | b2Transform |
struct | b2Sweep |
Defines | |
#define | b2Sqrt(x) sqrtf(x) |
#define | b2Atan2(y, x) atan2f(y, x) |
Functions | |
bool | b2IsValid (float32 x) |
float32 | b2InvSqrt (float32 x) |
This is a approximate yet fast inverse square-root. | |
float32 | b2Abs (float32 a) |
float32 | b2Dot (const b2Vec2 &a, const b2Vec2 &b) |
Perform the dot product on two vectors. | |
float32 | b2Cross (const b2Vec2 &a, const b2Vec2 &b) |
Perform the cross product on two vectors. In 2D this produces a scalar. | |
b2Vec2 | b2Cross (const b2Vec2 &a, float32 s) |
b2Vec2 | b2Cross (float32 s, const b2Vec2 &a) |
b2Vec2 | b2Mul (const b2Mat22 &A, const b2Vec2 &v) |
b2Vec2 | b2MulT (const b2Mat22 &A, const b2Vec2 &v) |
b2Vec2 | operator+ (const b2Vec2 &a, const b2Vec2 &b) |
Add two vectors component-wise. | |
b2Vec2 | operator- (const b2Vec2 &a, const b2Vec2 &b) |
Subtract two vectors component-wise. | |
b2Vec2 | operator* (float32 s, const b2Vec2 &a) |
bool | operator== (const b2Vec2 &a, const b2Vec2 &b) |
float32 | b2Distance (const b2Vec2 &a, const b2Vec2 &b) |
float32 | b2DistanceSquared (const b2Vec2 &a, const b2Vec2 &b) |
b2Vec3 | operator* (float32 s, const b2Vec3 &a) |
b2Vec3 | operator+ (const b2Vec3 &a, const b2Vec3 &b) |
Add two vectors component-wise. | |
b2Vec3 | operator- (const b2Vec3 &a, const b2Vec3 &b) |
Subtract two vectors component-wise. | |
float32 | b2Dot (const b2Vec3 &a, const b2Vec3 &b) |
Perform the dot product on two vectors. | |
b2Vec3 | b2Cross (const b2Vec3 &a, const b2Vec3 &b) |
Perform the cross product on two vectors. | |
b2Mat22 | operator+ (const b2Mat22 &A, const b2Mat22 &B) |
b2Mat22 | b2Mul (const b2Mat22 &A, const b2Mat22 &B) |
b2Mat22 | b2MulT (const b2Mat22 &A, const b2Mat22 &B) |
b2Vec3 | b2Mul (const b2Mat33 &A, const b2Vec3 &v) |
Multiply a matrix times a vector. | |
b2Vec2 | b2Mul (const b2Transform &T, const b2Vec2 &v) |
b2Vec2 | b2MulT (const b2Transform &T, const b2Vec2 &v) |
b2Vec2 | b2Abs (const b2Vec2 &a) |
b2Mat22 | b2Abs (const b2Mat22 &A) |
template<typename T > | |
T | b2Min (T a, T b) |
b2Vec2 | b2Min (const b2Vec2 &a, const b2Vec2 &b) |
template<typename T > | |
T | b2Max (T a, T b) |
b2Vec2 | b2Max (const b2Vec2 &a, const b2Vec2 &b) |
template<typename T > | |
T | b2Clamp (T a, T low, T high) |
b2Vec2 | b2Clamp (const b2Vec2 &a, const b2Vec2 &low, const b2Vec2 &high) |
template<typename T > | |
void | b2Swap (T &a, T &b) |
uint32 | b2NextPowerOfTwo (uint32 x) |
bool | b2IsPowerOfTwo (uint32 x) |
Variables | |
const b2Vec2 | b2Vec2_zero |
const b2Mat22 | b2Mat22_identity |
const b2Transform | b2Transform_identity |
#define b2Atan2 | ( | y, | |||
x | ) | atan2f(y, x) |
#define b2Sqrt | ( | x | ) | sqrtf(x) |
T b2Clamp | ( | T | a, | |
T | low, | |||
T | high | |||
) | [inline] |
Perform the cross product on two vectors.
Perform the cross product on a scalar and a vector. In 2D this produces a vector.
Perform the cross product on a vector and a scalar. In 2D this produces a vector.
Perform the cross product on two vectors. In 2D this produces a scalar.
Perform the dot product on two vectors.
Perform the dot product on two vectors.
bool b2IsPowerOfTwo | ( | uint32 | x | ) | [inline] |
bool b2IsValid | ( | float32 | x | ) | [inline] |
This function is used to ensure that a floating point number is not a NaN or infinity.
T b2Max | ( | T | a, | |
T | b | |||
) | [inline] |
T b2Min | ( | T | a, | |
T | b | |||
) | [inline] |
b2Vec2 b2Mul | ( | const b2Transform & | T, | |
const b2Vec2 & | v | |||
) | [inline] |
Multiply a matrix times a vector. If a rotation matrix is provided, then this transforms the vector from one frame to another.
b2Vec2 b2MulT | ( | const b2Transform & | T, | |
const b2Vec2 & | v | |||
) | [inline] |
Multiply a matrix transpose times a vector. If a rotation matrix is provided, then this transforms the vector from one frame to another (inverse transform).
"Next Largest Power of 2 Given a binary integer value x, the next largest power of 2 can be computed by a SWAR algorithm that recursively "folds" the upper bits into the lower bits. This process yields a bit vector with the same most significant 1 as x, but all 1's below it. Adding 1 to that value yields the next largest power of 2. For a 32-bit value:"
void b2Swap | ( | T & | a, | |
T & | b | |||
) | [inline] |
Subtract two vectors component-wise.
Subtract two vectors component-wise.
const b2Mat22 b2Mat22_identity |
const b2Vec2 b2Vec2_zero |