// 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 * MC * (((N dot D1) * C1) + ((N dot D2) * C2))
;Oa = 1

ps_1_1

def c0, 1.0, 0.0, 0.0, 1.0

tex  t0                      ;Sample base map
tex  t1                      ;Sample normal map
texcoord t2                  ;Load up D1
texcoord t3                  ;Load up D2

; 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 r0, r0, c3, r1           ;Color for Light2

mul_sat r0, r0, c1           ;Material Diffuse * Light

mul r0.rgb, r0, t0           ;Modulate Base Map
+mov r0.a, c0                ;Set alpha to 1