In other words, can a Gallium driver be written to take advantage of legacy fixed function video cards without programmable shaders?

From the TGSI Documentation, I see that declaration semantics and constant state objects have elements that explicitly mention attributes such as fog, color, and alpha. Are these sufficiently specific to extract state for use of pre-OpenGL-2.0 hardware?

If so, what types of state are and are not usable for this purpose?

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