DECLARATION
-
genType fwidth(genType p);
- genType fwidthCoarse(genType p);
- genType fwidthFine(genType p);
- genType fwidthCoarse(genType p);
PARAMETERS
p
-
- Specifies the expression of which to take the partial derivative.
DESCRIPTION
Available only in the fragment shader, these functions return the sum of the absolute derivatives in $x$ and $y$ using local differencing for the input argument p. fwidth is equivalent to abs(dFdx(p)) + abs(dFdy(p)). fwidthCoarse is equivalent to abs(dFdxCoarse(p)) + abs(dFdyCoarse(p)). fwidthFine is equivalent to abs(dFdxFine(p)) + abs(dFdyFine(p)).
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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| fwidth | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
✔
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| fwidthCoarse, fwidthFine | - | - | - | - | - | - | - | - | - | - | - |
✔
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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