2011 Khronos Group
fwidth 3G
fwidth return the sum of the absolute derivatives in x and y

## Declaration

genType `fwidth` genType p

## Parameters

p

  Specifies the expression of which to take the partial derivative.

## Description

Available only in the fragment shader, `fwidth` returns the sum of the absolute derivatives in x and y using local differencing for the input argument p. It is equivalent to `abs(dFdx(p)) + abs(dFdy(p))`.

## Version Support

#VARTABLECOLS#
#FUNCTABLEHEADER#
fwidth#newin11#

## See Also

dFdx, dFdy

## Copyright

Copyright 2011 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. http://opencontent.org/openpub/.