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16 lines
741 B
Markdown
16 lines
741 B
Markdown
## DFdx
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Return the partial derivative of an argument with respect to x
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### Declaration
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```glsl
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genType dFdx(float x);
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```
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### Parameters
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```p``` specifies the expression of which to take the partial derivative.
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### Description
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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.
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### See Also
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[dFdy()](/glossary/?search=dFdy) |