0.9.8: Common functions - Mame

| | 0.9.8 |

Common functions GLM Core

Functions

Detailed Description

These all operate component-wise.

The description is per component.

Function Documentation

| GLM_FUNC_DECL genType glm::abs | ( | genType | x | ) | |

Returns x if x >= 0; otherwise, it returns -x.

Template Parameters

| genType | floating-point or signed integer; scalar or vector types. |

| GLM_FUNC_DECL vecType<T, P> glm::ceil | ( | vecType< T, P > const & | x | ) | |

Returns a value equal to the nearest integer that is greater than or equal to x.

Template Parameters

| genType | Floating-point scalar or vector types. |

Returns min(max(x, minVal), maxVal) for each component in x using the floating-point values minVal and maxVal.

Template Parameters

| genType | Floating-point or integer; scalar or vector types. |

Referenced by glm::saturate().

| GLM_FUNC_DECL int glm::floatBitsToInt | ( | float const & | v | ) | |

Returns a signed integer value representing the encoding of a floating-point value.

The floating-point value's bit-level representation is preserved.

| GLM_FUNC_DECL vecType<int, P> glm::floatBitsToInt | ( | vecType< float, P > const & | v | ) | |

Returns a signed integer value representing the encoding of a floating-point value.

The floatingpoint value's bit-level representation is preserved.

| GLM_FUNC_DECL uint glm::floatBitsToUint | ( | float const & | v | ) | |

Returns a unsigned integer value representing the encoding of a floating-point value.

The floatingpoint value's bit-level representation is preserved.

| GLM_FUNC_DECL vecType<uint, P> glm::floatBitsToUint | ( | vecType< float, P > const & | v | ) | |

Returns a unsigned integer value representing the encoding of a floating-point value.

The floatingpoint value's bit-level representation is preserved.

| GLM_FUNC_DECL vecType<T, P> glm::floor | ( | vecType< T, P > const & | x | ) | |

Returns a value equal to the nearest integer that is less then or equal to x.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL genType glm::fma | ( | genType const & | a, | | | | genType const & | b, | | | | genType const & | c | | | ) | | |

Computes and returns a * b + c.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL genType glm::fract | ( | genType | x | ) | |

Return x - floor(x).

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL genType glm::frexp | ( | genType const & | x, | | | | genIType & | exp | | | ) | | |

Splits x into a floating-point significand in the range [0.5, 1.0) and an integral exponent of two, such that: x = significand * exp(2, exponent)

The significand is returned by the function and the exponent is returned in the parameter exp. For a floating-point value of zero, the significant and exponent are both zero. For a floating-point value that is an infinity or is not a number, the results are undefined.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL float glm::intBitsToFloat | ( | int const & | v | ) | |

Returns a floating-point value corresponding to a signed integer encoding of a floating-point value.

If an inf or NaN is passed in, it will not signal, and the resulting floating point value is unspecified. Otherwise, the bit-level representation is preserved.

| GLM_FUNC_DECL vecType<float, P> glm::intBitsToFloat | ( | vecType< int, P > const & | v | ) | |

Returns a floating-point value corresponding to a signed integer encoding of a floating-point value.

If an inf or NaN is passed in, it will not signal, and the resulting floating point value is unspecified. Otherwise, the bit-level representation is preserved.

| GLM_FUNC_DECL vecType<bool, P> glm::isinf | ( | vecType< T, P > const & | x | ) | |

Returns true if x holds a positive infinity or negative infinity representation in the underlying implementation's set of floating point representations.

Returns false otherwise, including for implementations with no infinity representations.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL vecType<bool, P> glm::isnan | ( | vecType< T, P > const & | x | ) | |

Returns true if x holds a NaN (not a number) representation in the underlying implementation's set of floating point representations.

Returns false otherwise, including for implementations with no NaN representations.

/!\ When using compiler fast math, this function may fail.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL genType glm::ldexp | ( | genType const & | x, | | | | genIType const & | exp | | | ) | | |

Builds a floating-point number from x and the corresponding integral exponent of two in exp, returning: significand * exp(2, exponent)

If this product is too large to be represented in the floating-point type, the result is undefined.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL genType glm::max | ( | genType | x, | | | | genType | y | | | ) | | |

Returns y if x < y; otherwise, it returns x.

Template Parameters

| genType | Floating-point or integer; scalar or vector types. |

| GLM_FUNC_DECL genType glm::min | ( | genType | x, | | | | genType | y | | | ) | | |

Returns y if y < x; otherwise, it returns x.

Template Parameters

| genType | Floating-point or integer; scalar or vector types. |

| GLM_FUNC_DECL vecType<T, P> glm::mix | ( | vecType< T, P > const & | x, | | | | vecType< T, P > const & | y, | | | | vecType< U, P > const & | a | | | ) | | |

If genTypeU is a floating scalar or vector: Returns x * (1.0 - a) + y * a, i.e., the linear blend of x and y using the floating-point value a.

The value for a is not restricted to the range [0, 1].

If genTypeU is a boolean scalar or vector: Selects which vector each returned component comes from. For a component of that is false, the corresponding component of x is returned. For a component of a that is true, the corresponding component of y is returned. Components of x and y that are not selected are allowed to be invalid floating point values and will have no effect on the results. Thus, this provides different functionality than genType mix(genType x, genType y, genType(a)) where a is a Boolean vector.

| [in] | x | Value to interpolate. | | [in] | y | Value to interpolate. | | [in] | a | Interpolant. |

Template Parameters

#include <glm/glm.hpp>

...

float a;

bool b;

glm::dvec3 e;

glm::dvec3 f;

glm::vec4 g;

glm::vec4 h;

...

glm::vec4 r = glm::mix(g, h, a); // Interpolate with a floating-point scalar two vectors.

glm::vec4 s = glm::mix(g, h, b); // Teturns g or h;

glm::dvec3 t = glm::mix(e, f, a); // Types of the third parameter is not required to match with the first and the second.

glm::vec4 u = glm::mix(g, h, r); // Interpolations can be perform per component with a vector for the last parameter.

Referenced by glm::lerp().

| GLM_FUNC_DECL genType glm::mod | ( | genType | x, | | | | genType | y | | | ) | | |

Modulus.

Returns x - y * floor(x / y) for each component in x using the floating point value y.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL genType glm::modf | ( | genType | x, | | | | genType & | i | | | ) | | |

Returns the fractional part of x and sets i to the integer part (as a whole number floating point value).

Both the return value and the output parameter will have the same sign as x.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL vecType<T, P> glm::round | ( | vecType< T, P > const & | x | ) | |

Returns a value equal to the nearest integer to x.

The fraction 0.5 will round in a direction chosen by the implementation, presumably the direction that is fastest. This includes the possibility that round(x) returns the same value as roundEven(x) for all values of x.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL vecType<T, P> glm::roundEven | ( | vecType< T, P > const & | x | ) | |

Returns a value equal to the nearest integer to x.

A fractional part of 0.5 will round toward the nearest even integer. (Both 3.5 and 4.5 for x will return 4.0.)

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL vecType<T, P> glm::sign | ( | vecType< T, P > const & | x | ) | |

Returns 1.0 if x > 0, 0.0 if x == 0, or -1.0 if x < 0.

Template Parameters

| genType | Floating-point or signed integer; scalar or vector types. |

Returns 0.0 if x <= edge0 and 1.0 if x >= edge1 and performs smooth Hermite interpolation between 0 and 1 when edge0 < x < edge1.

This is useful in cases where you would want a threshold function with a smooth transition. This is equivalent to: genType t; t = clamp ((x - edge0) / (edge1 - edge0), 0, 1); return t * t * (3 - 2 * t); Results are undefined if edge0 >= edge1.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL genType glm::step | ( | genType | edge, | | | | genType | x | | | ) | | |

Returns 0.0 if x < edge, otherwise it returns 1.0 for each component of a genType.

| GLM_FUNC_DECL vecType<T, P> glm::step | ( | T | edge, | | | | vecType< T, P > const & | x | | | ) | | |

Returns 0.0 if x < edge, otherwise it returns 1.0.

| GLM_FUNC_DECL vecType<T, P> glm::step | ( | vecType< T, P > const & | edge, | | | | vecType< T, P > const & | x | | | ) | | |

Returns 0.0 if x < edge, otherwise it returns 1.0.

| GLM_FUNC_DECL vecType<T, P> glm::trunc | ( | vecType< T, P > const & | x | ) | |

Returns a value equal to the nearest integer to x whose absolute value is not larger than the absolute value of x.

Template Parameters

| genType | Floating-point scalar or vector types. |

| GLM_FUNC_DECL float glm::uintBitsToFloat | ( | uint const & | v | ) | |

Returns a floating-point value corresponding to a unsigned integer encoding of a floating-point value.

If an inf or NaN is passed in, it will not signal, and the resulting floating point value is unspecified. Otherwise, the bit-level representation is preserved.

| GLM_FUNC_DECL vecType<float, P> glm::uintBitsToFloat | ( | vecType< uint, P > const & | v | ) | |

Returns a floating-point value corresponding to a unsigned integer encoding of a floating-point value.

If an inf or NaN is passed in, it will not signal, and the resulting floating point value is unspecified. Otherwise, the bit-level representation is preserved.

Generated by 1.8.10