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17 lines
743 B
Markdown
17 lines
743 B
Markdown
## DFdy
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Return the partial derivative of an argument with respect to y
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### Declaration
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```glsl
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genType dFdy(float y);
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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, ```dFdy``` return the partial derivative of expression ```p``` in ```y```. Derivatives are calculated using local differencing. Expressions that imply higher order derivatives such as ```dFdy(dFdy(n))``` have undefined results, as do mixed-order derivatives such as ```dFdy(dFdx(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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[dFdx()](/glossary/?search=dFdx)
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