Other Alias
unpackUnorm2x16, _unpackSnorm4x8DECLARATION
-
vec2 unpackUnorm2x16(uint p);
- vec2 unpackSnorm2x16(uint p);
- vec4 unpackUnorm4x8(uint p);
- vec4 unpackSnorm4x8(uint p);
- vec2 unpackSnorm2x16(uint p);
PARAMETERS
p
-
- Specifies an unsigned integer containing packed floating-point values.
DESCRIPTION
unpackUnorm2x16, unpackSnorm2x16, unpackUnorm4x8 and unpackSnorm4x8 unpack single 32-bit unsigned integers, specified in the parameter 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 performed as follows:
- • packUnorm2x16: f / 65535.0
- • packSnorm2x16: clamp(f / 32727.0, -1.0, 1.0)
- • packUnorm4x8: f / 255.0
- • packSnorm4x8: clamp(f / 127.0, -1.0, 1.0)
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.
VERSION SUPPORT
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OpenGL Shading Language Version
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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
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unpackUnorm2x16 | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ |
✔
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unpackSnorm2x16 | - | - | - | - | - | - | - | - | ✔ | ✔ | ✔ |
✔
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unpackUnorm4x8 | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ |
✔
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unpackSnorm4x8 | - | - | - | - | - | - | - | ✔ | ✔ | ✔ | ✔ |
✔
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COPYRIGHT
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. m[blue]http://opencontent.org/openpub/m[].
COPYRIGHT
Copyright © 2011-2014 Khronos Group