// 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

;Simple toon shading with outlining.
ps_1_1

def c0, 1.0, 1.0, 1.0, 1.0
def c3, -0.5, -0.5, -0.5, -0.5

tex t0                       ;sample the base map
tex t1                       ;sample the toon ramp
texcoord t2                  ;Get N dot V for outlining

mul r0, t0, v0               ;Base map * Material Color
mul r0.rgb, r0, t1           ;Base map * toon lighting

mad r0.a, c2, c3, t2.b       ;Move values into r0.a for comparison.  We must
    ;halve the outlineThickness constant in c2 since the artist has a range
    ;from 0 to 1.  Note that we negate constant c3 itself rather than using
    ;-c2 or -c3 in the instruction since source register modifiers on constants
    ;produce undefined results and will not validate in DX9.

cnd r0.rgb, r0.a, r0, c1     ;Run cnd.  If N dot V is less than 
    ;outlineThickness then we select outlineColor, c1.  Otherwise, we take the
    ;color from the pixel ops out of r0.
+mov r0.a, c0.a