/************************************************************************
LuminanceBlit.nvp

This pixel shader samples the first texture stage only and converts
the color-value obtained into a luminance-value.

Copyright (C) 1999, 2000 NVIDIA Corporation
*************************************************************************/

; Declare pixel shader version
ps.1.1

; declare constants:
def c1, 0.3f, 0.59f, 0.11f, 0.0f    ; luminance conversion constant
def c2, 0.0f, 0.0f, 0.0f, 1.0f      ; Add alpha

; get color from first texture stage only
tex t0

; convert color to luminance and output
dp3    r0.rgba, t0, c1

; Make sure that the alpha component is 1
add_sat    r0, r0, c2