ps.1.1

; t0: 
;		texture: dudv map
;		texcoords: dudvmap texcoords
; t1:
;		texture: refraction render target
;		texcoords: 

tex t0				; The normal map
tex t1				; Normalize the tangent-space vector to the eye

; dot eye-vector with per-pixel normal from t2
dp3 r1.rgba, t0_bx2, t1_bx2
mov r1, r1_sat 

mul r0.a, 1-r1.a, 1-r1.a			; squared
mul r0.a, r0.a, r0.a				; quartic
mul r0.a, r0.a, 1-r1.a				; quintic
mov r0.a, r0_sat.a

add r0.a, r0.a, v0.a				; Cheap water factor

mov r0.rgba, r0_sat.a