// 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

;Oily Film pixel shader from the alien's gauntlets modified to use a glow map
;instead of the warp effect map.  t0 is the packed texture coordinate and t1 
;is N dot V.  If we assume that the thin film on the gauntlet is of uniform 
;thickness, then N dot V actually approximates the distance that light travels
;through the film and is accurate in the lookup of the thin film ramp. The 
;final output is summarized below.
;
;B  = Base map
;TF = Thin film interference map
;G  = Glow map
;v0 = Diffuse lighting from vertex shader
;v1 = Specular lighting from vertex shader
;Oc = Output color
;Oa = Output alpha
;
;Oc = B * v0 + TF * v1 + G
;Oa = 1

ps_1_4

def c0, 1.0, 0.0, 0.0, 1.0

texld  r1, t1                ;Sample filmRamp based off of thickness in t1
texld  r0, t0                ;Sample baseMap with t0
texld  r2, t0                ;Sample glow map.

mul r0, r0, v0               ;Modulate base map by diffuse lighting.
add r0.rgb, r1, r0           ;Add in thin film interference

add r0.rgb, r2, r0           ;Add glow color.

add r0.rgb, r0, v1           ;Add in specular color.
+mov r0.a, c0.a              ;Move in warp alpha