; Declare pixel shader version
ps.1.1

; define constants
def c0, 0.25f, 0.25f, 0.25f, 0.25f

; get colors from all 4 texture stages
tex t0
tex t1
tex t2
tex t3

; and average them according to weights in constant mem:
; r0 = 0.25*t0 + 0.25*t1 + 0.25*t2 + 0.25*t3
mul r0, c0, t0
mad r0, c0, t1, r0
mad r0, c0, t2, r0
mad r0, c0, t3, r0
