retrieve OpenGL state from fragment program in CG

Hi Guys

I am using CG, and I would want to retrieve opengl state from fragment
program. I just need to know (inside the fragment program) if 2d texture is
enable in one particular texture unit.

/********* main program ************/
glActiveTextureARB(GL_TEXTURE1_ARB);
if (any condition)
  glEnable(GL_TEXTURE_2D);
else

  glDisable(GL_TEXTURE_2D);

/* ----------------------------
fragment program:
well, how to retrieve "texture unit 1" status without
using parameters.
is it possible to retrieve this kind on information from glstate.*?
how?
... */


Thx guys!
RIX

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