lrp - ps

Interpolates linearly between the second and third source registers by a proportion specified in the first source register.


lrp dst, src0, src1, src2



  • dst is the destination register.
  • src0 is a source register.
  • src1 is a source register.
  • src2 is a source register.


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


This instruction performs the linear interpolation based on the following formula.

dest = src0 * src1 + (1-src0) * src2
// which is the same as
dest = src2 + src0 * (src1 - src2)

Pixel Shader Instructions