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;The outlining shader.  Basically, this assumes that the fragment is a 
;silhouette edge if an N dot V calculation is less than the threshold in
;c1 that the artist sets.  The N dot V value is biased in the vertex shader
;and hence we do some math here to shift everything into the right ranges.
;cnd selects src1 when r0.a is greater than .5 and src2 when r0.a is less
;than .5.  src0 must always be r0.a in ps.1.1.  I don't know why it isn't
;implicit.

ps_1_1

def c4, -0.5, -0.5, -0.5, -0.5

texcoord t0                  ;Get N dot V biased

mad r0.a, c1, c4, t0.b       ;Move values into r0.a for comparison.  We must
    ;halve the outlineThickness constant in c1 since the artist has a range
    ;from 0 to 1.  Note that we negate constant c4 itself rather than using
    ;-c1 or -c4 in the instruction since source register modifiers on constants
    ;produce undefined results and will not validate in DX9.

cnd r0.rgb, r0.a, v0, c0     ;Run cnd.  If N dot V is less than 
    ;outlineThickness then we select black, c0.  Otherwise, we take the color
    ;from the vertex shader out of v0.
+mov r0.a, c0.a