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dFdx

Name

dFdx, dFdy — return the partial derivative of an argument with respect to x or y

Declaration

genType dFdx( genType p);
genType dFdy( genType p);

Parameters

p

Specifies the expression of which to take the partial derivative.

Description

Available only in the fragment shader, dFdx and dFdy return the partial derivative of expression p in x and y, respectively. Deviatives are calculated using local differencing. Expressions that imply higher order derivatives such as dFdx(dFdx(n)) have undefined results, as do mixed-order derivatives such as dFdx(dFdy(n)). It is assumed that the expression p is continuous and therefore, expressions evaluated via non-uniform control flow may be undefined.

Version Support

OpenGL ES Shading Language Version
Function Name 1.00 3.00 3.10
dFdx -
dFdy -

See Also

fwidth

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