# packUnorm

## Name

packUnorm2x16, packSnorm2x16, packUnorm4x8, packSnorm4x8 — pack floating-point values into an unsigned integer

## Declaration

 uint packUnorm2x16( vec2 v);

 uint packSnorm2x16( vec2 v);

 uint packUnorm4x8( vec4 v);

 uint packSnorm4x8( vec4 v);

## Parameters

v

Specifies a vector of values to be packed into an unsigned integer.

## Description

packUnorm2x16, packSnorm2x16, packUnorm4x8 and packSnorm4x8 convert each component of the normalized floating-point value v into 16- or 8-bit integer values and then packs the results into a 32-bit unsigned integer.

The conversion for component c of v to fixed-point is performed as follows:

• packUnorm2x16: round(clamp(c, 0.0, 1.0) * 65535.0)

• packSnorm2x16: round(clamp(c, -1.0, 1.0) * 32767.0)

• packUnorm4x8: round(clamp(c, 0.0, 1.0) * 255.0)

• packSnorm4x8: round(clamp(c, -1.0, 1.0) * 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.