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sampler.
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Conflicts:
src/gallium/drivers/softpipe/sp_state_derived.c
src/gallium/drivers/softpipe/sp_state_sampler.c
src/gallium/drivers/softpipe/sp_tex_sample.c
src/gallium/drivers/softpipe/sp_tex_sample.h
src/gallium/drivers/softpipe/sp_tile_cache.c
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Can't share sampler varients across multiple tex units because the texture
pointer is in the sampler varient. That prevents different textures per unit.
Fixes progs/demos/multiarb, progs/glsl/samplers, etc.
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Split into component pieces, stitch together at runtime using function
pointers. Make it possible to utilize the existing fastpaths as image-level
filters for generic mip-filtering routines.
Remove special case for rectangle filtering, as it can now be handled by
the 2d path.
As most of the mesa demo texturing was already covered by fast paths, its
harder to find examples of speedups, but tunnel gets a boost as mip-nearest
filtering is now able to access the img_2d_linear_wrap_POT functions
for sampling within a mipmap level.
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Let eg. sp_get_samples_rect be hooked directly in as the tgsi sampler
routine.
Add a field to determine whether this is a vertex or fragment sampling
call, and massage parameters to match the tgsi call.
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These do similar jobs but with largely disjoint code. Will want
to evolve them separately going forward.
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All these fastpaths are examples of the types of things we'd code-generate
in a more sophisticated version of softpipe.
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The tile cache is a utility, it shouldn't know anything about the
entity which is making use of it (ie softpipe).
Remove softpipe parameter to all the tilecache function calls, and
also remove the need to keep a softpipe pointer in the sampler structs.
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Need to disable/bypass lambda calculation since derivatives of texcoords
are meaningless for adjacent vertices.
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Use tgsi_sampler struct as a base class. Softpipe subclasses it and adds
the fields it needs.
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This is in a separate commit to ensure renames are properly preserved.
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