dFdx, dFdy — return the partial derivative of an argument with respect to x or y
genType dFdx(
genType p)
;
genType dFdy(
genType p)
;
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.
Function | Version 1.10 | Version 1.20 | Version 1.30 | Version 1.40 | Version 1.50 | Version 3.30 | Version 4.00 | Version 4.10 | Version 4.20 | Version 4.30 |
---|---|---|---|---|---|---|---|---|---|---|
dFdx | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y |
dFdy | Y | Y | Y | Y | Y | Y | Y | Y | Y | Y |
Copyright © 2011 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. http://opencontent.org/openpub/.