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Fixes a very tricky conformance failure.
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Brian's patch to clean up the shader interfaces.
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Use the code in cso_context.c rather than st_cache.c.
Basically, binding of state objects now goes through the CSO module.
But Vertex/fragment shaders go through pipe->bind_fs/vs_state() since they're
not cached by the CSO module at this time.
Also, update softpipe driver to handle NULL state objects in various places.
This happens during context destruction. May need to update other drivers...
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aaline/point/pstipple stages
Added a void *draw ptr to pipe_context. Probably look for a better solution someday.
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Use tgsi_scan_shader() to populate a tgsi_shader_info struct and use that instead.
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of IF/ELSE/ENDIF
Allows the shader to work on i915 hardware.
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AA points are drawn by converting the point to a quad, then modifying the
user's fragment shader to compute a coverage value. The final fragment
color's alpha is modulated by the coverage value. Fragments outside the
point's radius are killed.
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