xps.1.1

tex		t0	; Lightmap
tex		t1	; Texture (RGB)
tex		t3	; Bump normal map

xdd		r0.rgb, r1.rgb, t3_bx2, v1_bx2, c0, v1_bx2
add		r0.rgb, r0, -r1			; Delta angle

mad		r1.rgb, t0, c1, c2
mad		r0.rgb, r0_sat, r1, r1
+mov	r0.a, v0.a

xfc		fog.a, prod, fog.rgb, zero, t1, r0, r0.a



/*
bump_normal
vertex_normal
light_direction
light_color


bump_angle          = Dot(bump_normal, light_direction)
light_angle         = Dot(vertex_normal, light_direction)
delta_angle         = bump_angle - light_angle

bumpmapped_lighting = delta_angle*lightmap + light_angle*light_color
radiosity_ambient   = lightmap - light_angle*light_color

final_color         = texture*(bumpmapped_lighting + radiosity_ambient)
*/