Looking at the tdfx driver I see this:
/* FIXME: Combine this into one call...
*/
FALLBACK( tmesa, TDFX_FALLBACK_BLEND_EQ, mode != GL_FUNC_ADD_EXT );
FALLBACK( tmesa, TDFX_FALLBACK_BLEND_EQ,
ctx->Color.ColorLogicOpEnabled && ctx->Color.LogicOp != GL_COPY );
This is broken because the two conditions attempt to use a single bit.
Imagine the case where (mode == GL_FUNC_ADD_EXT) but (ctx->Color.ColorLogicOp
== GL_COPY): The first call will install a fallback, but the second will
immediately clear the fallback...
The solution is to associate a single logical condition for each bit in the
fallback mask. In this case you could combine the two conditions with a
disjunctive, or alternatively use different bits in the mask for the two
conditions.
Keith
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