Floating-Point Pack and Unpack Functions
GLM Core

## Functions

double packDouble2x32 (detail::tvec2< detail::uint32 > const &v)
uint packHalf2x16 (vec2 const &v)
detail::uint32 packSnorm2x16 (detail::tvec2< detail::float32 > const &v)
detail::uint32 packSnorm4x8 (detail::tvec4< detail::float32 > const &v)
detail::uint32 packUnorm2x16 (detail::tvec2< detail::float32 > const &v)
detail::uint32 packUnorm4x8 (detail::tvec4< detail::float32 > const &v)
detail::tvec2< detail::uint32 > unpackDouble2x32 (double const &v)
vec2 unpackHalf2x16 (uint const &v)
detail::tvec2< detail::float32 > unpackSnorm2x16 (detail::uint32 const &p)
detail::tvec4< detail::float32 > unpackSnorm4x8 (detail::uint32 const &p)
detail::tvec2< detail::float32 > unpackUnorm2x16 (detail::uint32 const &p)
detail::tvec4< detail::float32 > unpackUnorm4x8 (detail::uint32 const &p)

## Detailed Description

These functions do not operate component-wise, rather as described in each case.

## Function Documentation

 double glm::packDouble2x32 ( detail::tvec2< detail::uint32 > const & v )

Returns a double-precision value obtained by packing the components of v into a 64-bit value.

If an IEEE 754 Inf or NaN is created, it will not signal, and the resulting floating point value is unspecified. Otherwise, the bit- level representation of v is preserved. The first vector component specifies the 32 least significant bits; the second component specifies the 32 most significant bits.

GLSL packDouble2x32 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 uint glm::packHalf2x16 ( vec2 const & v )

Returns an unsigned integer obtained by converting the components of a two-component floating-point vector to the 16-bit floating-point representation found in the OpenGL Specification, and then packing these two 16- bit integers into a 32-bit unsigned integer.

The first vector component specifies the 16 least-significant bits of the result; the second component specifies the 16 most-significant bits.

GLSL packHalf2x16 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::uint32 glm::packSnorm2x16 ( detail::tvec2< detail::float32 > const & v )

First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.

Then, the results are packed into the returned 32-bit unsigned integer.

The conversion for component c of v to fixed point is done as follows: packSnorm2x16: round(clamp(v, -1, +1) * 32767.0)

The first component of the vector will be written to the least significant bits of the output; the last component will be written to the most significant bits.

GLSL packSnorm2x16 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::uint32 glm::packSnorm4x8 ( detail::tvec4< detail::float32 > const & v )

First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.

Then, the results are packed into the returned 32-bit unsigned integer.

The conversion for component c of v to fixed point is done as follows: packSnorm4x8: round(clamp(c, -1, +1) * 127.0)

The first component of the vector will be written to the least significant bits of the output; the last component will be written to the most significant bits.

GLSL packSnorm4x8 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::uint32 glm::packUnorm2x16 ( detail::tvec2< detail::float32 > const & v )

First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.

Then, the results are packed into the returned 32-bit unsigned integer.

The conversion for component c of v to fixed point is done as follows: packUnorm2x16: round(clamp(c, 0, +1) * 65535.0)

The first component of the vector will be written to the least significant bits of the output; the last component will be written to the most significant bits.

GLSL packUnorm2x16 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::uint32 glm::packUnorm4x8 ( detail::tvec4< detail::float32 > const & v )

First, converts each component of the normalized floating-point value v into 8- or 16-bit integer values.

Then, the results are packed into the returned 32-bit unsigned integer.

The conversion for component c of v to fixed point is done as follows: packUnorm4x8: round(clamp(c, 0, +1) * 255.0)

The first component of the vector will be written to the least significant bits of the output; the last component will be written to the most significant bits.

GLSL packUnorm4x8 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::tvec2 glm::unpackDouble2x32 ( double const & v )

Returns a two-component unsigned integer vector representation of v.

The bit-level representation of v is preserved. The first component of the vector contains the 32 least significant bits of the double; the second component consists the 32 most significant bits.

GLSL unpackDouble2x32 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 vec2 glm::unpackHalf2x16 ( uint const & v )

Returns a two-component floating-point vector with components obtained by unpacking a 32-bit unsigned integer into a pair of 16-bit values, interpreting those values as 16-bit floating-point numbers according to the OpenGL Specification, and converting them to 32-bit floating-point values.

The first component of the vector is obtained from the 16 least-significant bits of v; the second component is obtained from the 16 most-significant bits of v.

GLSL unpackHalf2x16 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::tvec2 glm::unpackSnorm2x16 ( detail::uint32 const & p )

First, unpacks a single 32-bit unsigned integer p into a pair of 16-bit unsigned integers, four 8-bit unsigned integers, or four 8-bit signed integers.

Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.

The conversion for unpacked fixed-point value f to floating point is done as follows: unpackSnorm2x16: clamp(f / 32767.0, -1, +1)

The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits.

GLSL unpackSnorm2x16 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::tvec4 glm::unpackSnorm4x8 ( detail::uint32 const & p )

First, unpacks a single 32-bit unsigned integer p into a pair of 16-bit unsigned integers, four 8-bit unsigned integers, or four 8-bit signed integers.

Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.

The conversion for unpacked fixed-point value f to floating point is done as follows: unpackSnorm4x8: clamp(f / 127.0, -1, +1)

The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits.

GLSL unpackSnorm4x8 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::tvec2 glm::unpackUnorm2x16 ( detail::uint32 const & p )

First, unpacks a single 32-bit unsigned integer p into a pair of 16-bit unsigned integers, four 8-bit unsigned integers, or four 8-bit signed integers.

Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.

The conversion for unpacked fixed-point value f to floating point is done as follows: unpackUnorm2x16: f / 65535.0

The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits.

GLSL unpackUnorm2x16 man page
GLSL 4.20.8 specification, section 8.4 Floating-Point Pack and Unpack Functions
 detail::tvec4 glm::unpackUnorm4x8 ( detail::uint32 const & p )

First, unpacks a single 32-bit unsigned integer p into a pair of 16-bit unsigned integers, four 8-bit unsigned integers, or four 8-bit signed integers.

Then, each component is converted to a normalized floating-point value to generate the returned two- or four-component vector.

The conversion for unpacked fixed-point value f to floating point is done as follows: unpackUnorm4x8: f / 255.0

The first component of the returned vector will be extracted from the least significant bits of the input; the last component will be extracted from the most significant bits.