xps.1.1

#define AMBIENT  c0
#define DIFFUSE  c1
#define SPECULAR c2
   
#define NORMAL_MAP  t0
#define LIGHT_DIR   t1
#define HALF_DIR    t2
#define SHADOW_MAP  t3
#define FALLOFF     v0 

def c4, 0.25f,0.25f,0.25f,1.f


tex t0 ; normal map
tex t1 ; light dir cubemap
tex t2 ; half dir cubemap
tex t3 ; shadow depth map

; Compute N dot L and N dot H
xdd  r0,r1,t0_bx2,t1_bx2,t0_bx2,t2_bx2

; Raise N dot H to 16th power
mul  r1.rgb,r1_sat.rgb,r1_sat.rgb
mul  r1.rgb,r1.rgb,r1.rgb
mul  r1.rgb,r1.rgb,r1.rgb
mul  r1.rgb,r1.rgb,r1.rgb

; Scale diffuse and specular terms by coefficients, and sum the resulting terms.
xmma r0.rgb,r1.rgb,v1.rgb,DIFFUSE.rgb,r0_sat.rgb,SPECULAR.rgb,r1_sat.rgb


; Scale by falloff, and add in ambient term
mad r0.rgb,v0.rgb,v1_sat.rgb,AMBIENT.rgb




xfc r0,t3,zero,prod,r0,c4,c4.a