fwidth — return the sum of the absolute value of derivatives in x and y
genType fwidth( | genType p); |
genType fwidthCoarse( | genType p); |
genType fwidthFine( | genType p); |
p Specifies the expression of which to take the partial derivative.
Available only in the fragment shader, these functions return the sum of the absolute derivatives in $x$ and $y$ using local differencing for the input argument p. fwidth is equivalent to . abs(dFdx(p)) + abs(dFdy(p)) fwidthCoarse is equivalent to . abs(dFdxCoarse(p)) + abs(dFdyCoarse(p)) fwidthFine is equivalent to . abs(dFdxFine(p)) + abs(dFdyFine(p))
| OpenGL Shading Language Version | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Function Name | 1.10 | 1.20 | 1.30 | 1.40 | 1.50 | 3.30 | 4.00 | 4.10 | 4.20 | 4.30 | 4.40 | 4.50 |
| fwidth | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ | ✔ |
| fwidthCoarse, fwidthFine | - | - | - | - | - | - | - | - | - | - | - | ✔ |
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