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DFdx
Return the partial derivative of an argument with respect to x
Declaration
genType dFdx(float x);
Parameters
p specifies the expression of which to take the partial derivative.
Description
Available only in the fragment shader, dFdx return the partial derivative of expression p in x. 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.