GLSL Equivalent of HLSL ddx/ddy Functions

Quick query:
Is there a GLSL equivalent to the builtin HLSL ddx/ddy functions, defined as

‘Returns the partial derivative of x/y with respect to the screen-space x/y coordinate’



Look into dFdx() and dFdy(), that may be what you want. :slight_smile:

Thanks HexCat, I’ll have a look at those.


There is a fwidth§ function:
Returns the sum of the absolute derivative in x and y using local differencing for the input argument p, i.e.:
return = abs(dFdx §) + abs(dFdy §);

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