FWIDTH(3G) [FIXME: manual] FWIDTH(3G)

fwidth - return the sum of the absolute value of derivatives in x and y

genType fwidth(genType p);

genType fwidthCoarse(genType p);

genType fwidthFine(genType p);

p

Specifies the expression of which to take the partial derivative.

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)).

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
fwidth ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔ ✔
fwidthCoarse, fwidthFine - - - - - - - - - - - ✔

dFdx()

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. http://opencontent.org/openpub/.

Copyright © 2011-2014 Khronos Group

05/21/2022 [FIXME: source]