// 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) 1996-2008 Emergent Game Technologies.
//      All Rights Reserved.
//
// Emergent Game Technologies, Chapel Hill, North Carolina 27517
// http://www.emergent.net

;LuminanceTransfer
;Take the diffuse color after modulating in the base map and compute the 
;luminance.  Use that value to make a dependent read of the transfer texture.

ps_1_4

def c0, 0.299f, 0.587f, 0.114f, 1.0f

texld r1, t1                 ;sample base map
texcrd r0.rgb, t0.rgb        ;grab the color from t1

mul_sat r0.rgb, r0, r1       ;modulate base texture by VC
dp3 r0, c0, r0               ;use dp3 to do luminance convert

phase

texld r0, r0                 ;dependent lookup of the transfer ramp