i915: texture indirection

Hi,

could someone explain to me how texture-lookup indirection works on
an Intel GMA 3100 with Mesa 7.9?

When I try to use GL multitexturing with more than 3 active texture
units, the driver complains with:

  i915_program_error: Exceeded max nr indirect texture lookups (5 out of 4)

From what I've read in the GL_ARB_fragment_program spec, I'd expect
indirection to happen if the value of some texture is used as coordinate
into another texture.

I still use the GL 1.4 fixed-function pipeline and I really don't understand
were the indirection happens. Am I missing something or is this a problem
with the driver?

Regards
Thomas



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