dFdx, dFdy — return the partial derivative of an argument with respect to x or y
Specifies the expression of which to take the partial derivative.
Available only in the fragment shader,
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
It is assumed that the expression
p is continuous and therefore, expressions evaluated
via non-uniform control flow may be undefined.
|OpenGL ES Shading Language Version|
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