mirror of
https://github.com/patriciogonzalezvivo/thebookofshaders
synced 2024-11-05 21:21:06 +00:00
17 lines
742 B
Markdown
17 lines
742 B
Markdown
## DFdx
|
|
Return the partial derivative of an argument with respect to x
|
|
|
|
### Declaration
|
|
```glsl
|
|
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.
|
|
|
|
### See Also
|
|
[dFdy()](/glossary/?search=dFdy)
|