rcp (Pixel Shader)

Computes the reciprocal of the source scalar.

Syntax

rcp dst, src

where

dst is the destination register.
src is a source register. Source register requires explicit use of replicate swizzle, that is, exactly one of the .x, .y, .z, .w swizzle components (or the .r, .g, .b, .a equivalents) must be specified.

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

The output must be exactly 1.0 if the input is exactly 1.0. A source of 0.0 yields infinity.

The scalar result is replicated to all channels in the destination write mask.

Precision should be at least 1.0/(2²²) absolute error over the range (1.0, 2.0) because common implementations will separate mantissa and exponent.

Minimum operating system	Windows 98