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fwidth

Name

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

Declaration

genType fwidth( genType p);
genType fwidthCoarse( genType p);
genType fwidthFine( 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

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 - - - - - - - - - - -

See Also

dFdx

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