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saves us a dword in sampler state, hw can't do non-integer aniso degree anyway.
To allow aniso 1x (which seems of dubious value but some hardware (radeons)
have such a mode, and even d3d allows specifiying it) redefine anisotropic
filtering as disabled only if max_anistropy is 0.
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Also fix and clarify depth/stencil/alpha documentation a bit.
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Conflicts:
src/gallium/drivers/nv10/nv10_state.c
src/gallium/drivers/nv20/nv20_state.c
src/gallium/drivers/nv50/nv50_program.c
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This determines if points should be rasterized according to GL point rules
or as normal quads (GL point sprites / d3d points / d3d point sprites).
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Don't need sprite coord origin per coord.
Also, don't need separate sprite enable bit - if all coords have it diabled,
then there are no point sprites (technically, there's a distinction in pre-GL3,
but it only differs in having more leniency in clamping to max size, something
the state tracker would need to handle and the hardware won't bother anyway).
Also, use packed field for the per-coord enables.
All in all, should save 3 dwords in rasterizer state (from 10 down to 7).
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I'm getting better at this, I think.
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I fail at Sphinx-style ReST.
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The state tracker is responsible for clamping to any graphics API enforced
size min/max limits for both the static point_size setting as well as per
vertex point size (in the vertex shader).
Note that mesa state tracker didn't actually use these values.
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...And looks like there's already things I don't know. Go figure.
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In Sphinx/ReST format.
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