thebookofshaders/glossary/dFdy.md

DFdy

Return the partial derivative of an argument with respect to y

Declaration

genType dFdy(float y);

Parameters

p specifies the expression of which to take the partial derivative.

Description

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

See Also

dFdx()