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Where vs output semantic tags indicate an output is signficant for
fixed function processing (such as clipping, unfilled modes, etc),
retain information about that output so that we can get to it easily
later on.
Fix up the unfilled processing, but hard-wire edgeflag to one for now.
With this change, trivial/tri-unfilled works.
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Vertex shader now emits just the FS inputs, in the positions and order
expected by the fragment shader.
This means potentially regenerating the vertex shader to match
different fragment shader's input layouts.
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Any allocation that may fail should be checked, and propogate the
error upwards. At the highest level we will flush batch and retry.
This is an alternate strategy to what the original DRI driver did of
attempting to flush batch from the lowest levels (eg inside
BEGIN_BATCH). The trouble with that strategy was that flushes could
occur at unexpected times, and additionally there was a need for a
wierd notification mechanism to propogate the 'lost context' state
back up to higher levels.
Propogating the errors directly gives us a lot of flexibility how to
deal with these states, at the expense of a lot more checking in the
code.
Will add some sanity checks later to make sure that out-of-memory
conditions are properly escalated and not lost halfway up the stack.
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