// EMERGENT GAME TECHNOLOGIES PROPRIETARY INFORMATION
//
// This software is supplied under the terms of a license agreement or
// nondisclosure agreement with Emergent Game Technologies and may not 
// be copied or disclosed except in accordance with the terms of that 
// agreement.
//
//      Copyright (c) 1996-2007 Emergent Game Technologies.
//      All Rights Reserved.
//
// Emergent Game Technologies, Chapel Hill, North Carolina 27517
// http://www.emergent.net

;Light the skin with a directional lights and a bump map.
;
;B  = Base map
;N  = Per pixel normal from normal map
;D1 = Light 1 Direction in t2
;C1 = Light 1 Color in c2
;AL = Ambient lighting in oD0
;MC = Material color in oD1
;Oc = Output color
;Oa = Output alpha
;
;Oc = B * ((((N dot D1) * C1) * MC) + AL)
;Oa = 1

ps_1_1

def c0, 1.0,0.0,0.0,1.0

tex t0                       ; base map
tex t1                       ; normal map
texcoord t2                  ; light vector 1 in tangent space
texcoord t3                  ; light vector 2 in tangent space

; N dot L.  Both vectors are biased coming out of the vertex shader.
dp3_sat r1, t1_bx2, t2_bx2   ;N dot L for Light1
mul_sat r1, r1, c2           ;Color for Light1

dp3_sat r0, t1_bx2, t3_bx2   ;N dot L for Light2
mad_sat r1, c3, r0, r1       ;Color for Light2

mad r1, r1, v1, v0           ;material diffuse + ambient

mul r0, r1, t0               ;Modulate base map.