frc - ps

Returns the fractional portion of each input component.

Syntax

frc dst, src

where

dst is the destination register.
src is a source register.

Remarks

Pixel shader versions	1_1	1_2	1_3	1_4	2_0	2_x	2_sw	3_0	3_sw
frc					x	x	x	x	x

The following code snippet 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.