packUnorm — pack floating-point values into an unsigned integer
uint packUnorm2x16( | vec2 v); |
uint packSnorm2x16( | vec2 v); |
uint packUnorm4x8( | vec4 v); |
uint packSnorm4x8( | vec4 v); |
v Specifies a vector of values to be packed into an unsigned integer.
packUnorm2x16, packSnorm2x16, packUnorm4x8 and packSnorm4x8 convert each component of the normalized floating-ponit value v into 8- or 16-bit integer values and then packs the results into a 32-bit unsigned intgeter.
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.
| OpenGL Shading Language Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50 |
| packUnorm2x16 | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ |
| packSnorm2x16 | - | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ |
| packUnorm4x8 | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ |
| packSnorm4x8 | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ | ✔ |
unpackUnorm2x16, unpackSnorm2x16, unpackUnorm4x8, unpackSnorm4x8
Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.