dFdx, dFdy — return the partial derivative of an argument with respect to x or y
genType dFdx( | genType p); |
genType dFdy( | genType p); |
p Specifies the expression of which to take the partial derivative.
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.
| OpenGL ES Shading Language Version | |||
|---|---|---|---|
| Function Name | 1.00 | 3.00 | 3.10 |
| dFdx | - | ✔ | ✔ |
| dFdy | - | ✔ | ✔ |
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