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  1. ; Inputs:   v0   = Position
  2. ;           v3   = Normal
  3. ;           c0   = Constant (0,0.5,xxx,xxx)
  4. ;           c1-4 = WorldView matrix
  5. ;           c5-9 = WorldViewProjection matrix
  6.  
  7. vs.1.0                             ; Shader version 1.0
  8. m4x4    r0   , v0   , c1           ; r0 = View space position
  9. m3x3    r1   , v3   , c1           ; r1 = View space normal
  10. m4x4    oPos , v0   , c5           ; Spit out projected position
  11. dp3     r2.x , r0   , r0           ; Normalize r0 (position)
  12. rsq     r2.x , r2.x
  13. mul     r0   , r0   , r2.x
  14. dp3     r3.x , r0   , -r1          ; Compute dot product
  15. mad     oD0.w, r3.x , c0.y , c0.y  ; Scale to [0,1] and make alpha
  16. mov     oD0.xyz     , c0.x         ; Diffuse RGB is 0
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