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irrMath.h File Reference

#include "IrrCompileConfig.h"
#include "irrTypes.h"
#include <math.h>
#include <float.h>
#include <stdlib.h>
#include <limits.h>

Go to the source code of this file.

Classes

union  irr::core::inttofloat

Namespaces

namespace  irr
 

Everything in the Irrlicht Engine can be found in this namespace.


namespace  irr::core
 

Basic classes such as vectors, planes, arrays, lists, and so on can be found in this namespace.


Defines

#define AIR(x)   (IR(x)&0x7fffffff)
 Absolute integer representation of a floating-point value.
#define F32_A_GREATER_B(a, b)   ((a) > (b))
#define F32_AS_S32(f)   (*((s32 *) &(f)))
#define F32_AS_U32(f)   (*((u32 *) &(f)))
#define F32_AS_U32_POINTER(f)   ( ((u32 *) &(f)))
#define F32_EQUAL_0(n)   ((n) == 0.0f)
#define F32_EQUAL_1(n)   ((n) == 1.0f)
#define F32_EXPON_MANTISSA   0x7FFFFFFFU
#define F32_GREATER_0(n)   ((n) > 0.0f)
#define F32_GREATER_EQUAL_0(n)   ((n) >= 0.0f)
#define F32_LOWER_0(n)   ((n) < 0.0f)
#define F32_LOWER_EQUAL_0(n)   ((n) <= 0.0f)
#define F32_SIGN_BIT   0x80000000U
#define F32_VALUE_0   0x00000000
#define F32_VALUE_1   0x3f800000
#define IEEE_1_0   0x3f800000
 integer representation of 1.0
#define IEEE_255_0   0x437f0000
 integer representation of 255.0

Functions

template<class T >
irr::core::abs_ (const T &a)
 returns abs of two values. Own implementation to get rid of STL (VS6 problems)
REALINLINE s32 irr::core::ceil32 (f32 x)
template<class T >
const T irr::core::clamp (const T &value, const T &low, const T &high)
 clamps a value between low and high
REALINLINE void irr::core::clearFPUException ()
f64 irr::core::degToRad (f64 degrees)
 Utility function to convert a degrees value to radians.
f32 irr::core::degToRad (f32 degrees)
 Utility function to convert a degrees value to radians.
bool irr::core::equals (const u32 a, const u32 b, const s32 tolerance=ROUNDING_ERROR_S32)
 returns if a equals b, taking an explicit rounding tolerance into account
bool irr::core::equals (const s32 a, const s32 b, const s32 tolerance=ROUNDING_ERROR_S32)
 returns if a equals b, taking an explicit rounding tolerance into account
bool irr::core::equals (const f32 a, const f32 b, const f32 tolerance=ROUNDING_ERROR_f32)
 returns if a equals b, taking possible rounding errors into account
bool irr::core::equals (const f64 a, const f64 b, const f64 tolerance=ROUNDING_ERROR_f64)
 returns if a equals b, taking possible rounding errors into account
f32 irr::core::f32_max3 (const f32 a, const f32 b, const f32 c)
f32 irr::core::f32_min3 (const f32 a, const f32 b, const f32 c)
REALINLINE s32 irr::core::floor32 (f32 x)
f32 irr::core::FR (s32 x)
f32 irr::core::FR (u32 x)
 Floating-point representation of an integer value.
f32 irr::core::fract (f32 x)
REALINLINE u32 irr::core::if_c_a_else_0 (const s32 condition, const u32 a)
 conditional set based on mask and arithmetic shift
REALINLINE u16 irr::core::if_c_a_else_b (const s16 condition, const u16 a, const u16 b)
 conditional set based on mask and arithmetic shift
REALINLINE u32 irr::core::if_c_a_else_b (const s32 condition, const u32 a, const u32 b)
 conditional set based on mask and arithmetic shift
u32 irr::core::IR (f32 x)
bool irr::core::isnotzero (const f32 a, const f32 tolerance=ROUNDING_ERROR_f32)
 returns if a equals not zero, taking rounding errors into account
bool irr::core::iszero (const u32 a, const u32 tolerance=0)
 returns if a equals zero, taking rounding errors into account
bool irr::core::iszero (const s32 a, const s32 tolerance=0)
 returns if a equals zero, taking rounding errors into account
bool irr::core::iszero (const f32 a, const f32 tolerance=ROUNDING_ERROR_f32)
 returns if a equals zero, taking rounding errors into account
bool irr::core::iszero (const f64 a, const f64 tolerance=ROUNDING_ERROR_f64)
 returns if a equals zero, taking rounding errors into account
template<class T >
irr::core::lerp (const T &a, const T &b, const f32 t)
template<class T >
const T & irr::core::max_ (const T &a, const T &b, const T &c)
 returns maximum of three values. Own implementation to get rid of the STL (VS6 problems)
template<class T >
const T & irr::core::max_ (const T &a, const T &b)
 returns maximum of two values. Own implementation to get rid of the STL (VS6 problems)
template<class T >
const T & irr::core::min_ (const T &a, const T &b, const T &c)
 returns minimum of three values. Own implementation to get rid of the STL (VS6 problems)
template<class T >
const T & irr::core::min_ (const T &a, const T &b)
 returns minimum of two values. Own implementation to get rid of the STL (VS6 problems)
f64 irr::core::radToDeg (f64 radians)
 Utility function to convert a radian value to degrees.
f32 irr::core::radToDeg (f32 radians)
 Utility function to convert a radian value to degrees.
REALINLINE f64 irr::core::reciprocal (const f64 f)
REALINLINE f32 irr::core::reciprocal (const f32 f)
REALINLINE f32 irr::core::reciprocal_approxim (const f32 f)
REALINLINE s32 irr::core::reciprocal_squareroot (const s32 x)
REALINLINE f32 irr::core::reciprocal_squareroot (const f32 f)
REALINLINE f64 irr::core::reciprocal_squareroot (const f64 x)
REALINLINE s32 irr::core::round32 (f32 x)
f32 irr::core::round_ (f32 x)
s32 irr::core::s32_clamp (s32 value, s32 low, s32 high)
s32 irr::core::s32_max (s32 a, s32 b)
s32 irr::core::s32_min (s32 a, s32 b)
REALINLINE void irr::core::setbit_cond (u32 &state, s32 condition, u32 mask)
REALINLINE s32 irr::core::squareroot (const s32 f)
REALINLINE f64 irr::core::squareroot (const f64 f)
REALINLINE f32 irr::core::squareroot (const f32 f)
template<class T1 , class T2 >
void irr::core::swap (T1 &a, T2 &b)
 swaps the content of the passed parameters

Variables

const f32 irr::core::DEGTORAD = PI / 180.0f
 32bit Constant for converting from degrees to radians
const f64 irr::core::DEGTORAD64 = PI64 / 180.0
 64bit constant for converting from degrees to radians (formally known as GRAD_PI2)
const f32 irr::core::HALF_PI = PI/2.0f
 Constant for half of PI.
const f32 irr::core::PI = 3.14159265359f
 Constant for PI.
const f64 irr::core::PI64 = 3.1415926535897932384626433832795028841971693993751
 Constant for 64bit PI.
const f32 irr::core::RADTODEG = 180.0f / PI
 32bit constant for converting from radians to degrees (formally known as GRAD_PI)
const f64 irr::core::RADTODEG64 = 180.0 / PI64
 64bit constant for converting from radians to degrees
const f32 irr::core::RECIPROCAL_PI = 1.0f/PI
 Constant for reciprocal of PI.
const f64 irr::core::RECIPROCAL_PI64 = 1.0/PI64
 Constant for 64bit reciprocal of PI.
const f32 irr::core::ROUNDING_ERROR_f32 = 0.000001f
const f64 irr::core::ROUNDING_ERROR_f64 = 0.00000001
const s32 irr::core::ROUNDING_ERROR_S32 = 0
 Rounding error constant often used when comparing f32 values.

Define Documentation

#define AIR (  )     (IR(x)&0x7fffffff)

Absolute integer representation of a floating-point value.

Definition at line 294 of file irrMath.h.

#define F32_A_GREATER_B ( a,
 )     ((a) > (b))

Definition at line 328 of file irrMath.h.

#define F32_AS_S32 (  )     (*((s32 *) &(f)))

Definition at line 276 of file irrMath.h.

#define F32_AS_U32 (  )     (*((u32 *) &(f)))

Definition at line 277 of file irrMath.h.

#define F32_AS_U32_POINTER (  )     ( ((u32 *) &(f)))

Definition at line 278 of file irrMath.h.

#define F32_EQUAL_0 (  )     ((n) == 0.0f)

Definition at line 327 of file irrMath.h.

#define F32_EQUAL_1 (  )     ((n) == 1.0f)

Definition at line 326 of file irrMath.h.

#define F32_EXPON_MANTISSA   0x7FFFFFFFU

Definition at line 283 of file irrMath.h.

#define F32_GREATER_0 (  )     ((n) > 0.0f)

Definition at line 324 of file irrMath.h.

#define F32_GREATER_EQUAL_0 (  )     ((n) >= 0.0f)

Definition at line 325 of file irrMath.h.

#define F32_LOWER_0 (  )     ((n) < 0.0f)

Definition at line 322 of file irrMath.h.

#define F32_LOWER_EQUAL_0 (  )     ((n) <= 0.0f)
#define F32_SIGN_BIT   0x80000000U

Definition at line 282 of file irrMath.h.

#define F32_VALUE_0   0x00000000

Definition at line 280 of file irrMath.h.

#define F32_VALUE_1   0x3f800000

Definition at line 281 of file irrMath.h.

Referenced by irr::core::CMatrix4< T >::isIdentity_integer_base().

#define IEEE_1_0   0x3f800000

integer representation of 1.0

Definition at line 305 of file irrMath.h.

#define IEEE_255_0   0x437f0000

integer representation of 255.0

Definition at line 307 of file irrMath.h.


The Irrlicht Engine
The Irrlicht Engine Documentation © 2003-2010 by Nikolaus Gebhardt. Generated on Sun Oct 24 12:41:58 2010 by Doxygen (1.6.2)