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 | - | - | - | - | - | - | - | - | - | - | - | ✔ |
Copyright © 2011-2014 Khronos Group. This material may be distributed subject to the terms and conditions set forth in the Open Publication License, v 1.0, 8 June 1999. https://opencontent.org/openpub/.