| title | description | ms.assetid | ms.topic | ms.date | topic_type | api_name | api_type | api_location | |
|---|---|---|---|---|---|---|---|---|---|
frc - vs |
Returns the fractional portion of each input component. | frc - vs |
6b6a4475-b665-4de0-9423-88ea8103e606 |
reference |
05/31/2018 |
|
Returns the fractional portion of each input component.
| frc dst, src |
|---|
where
- dst is the destination register.
- src is a source register.
| Vertex shader versions | 1_1 | 2_0 | 2_x | 2_sw | 3_0 | 3_sw |
|---|---|---|---|---|---|---|
| frc | x | x | x | x | x | x |
The following code fragment shows conceptually how the instruction operates.
dest.x = src.x - (float)floor(src.x);
dest.y = src.y - (float)floor(src.y);
dest.z = src.z - (float)floor(src.z);
dest.w = src.w - (float)floor(src.w);
The floor function converts the argument passed in to the greatest integer that is less than (or equal to) the argument. This is converted to a float and then subtracted fom the original value. The resulting fractional value ranges from 0.0 through 1.0.
For version 1_1, the allowable write masks are .y and .xy (.x is not allowed).