There is no API for setting the point size and the shader is always
required to set it. Section 24.4:
"If the value written to PointSize is less than or equal to zero, or
if no value was written to PointSize, results are undefined."
As such, we can just always program PointWidthSource to Vertex. This
simplifies anv_pipeline a bit and avoids trouble when we enable the
pipeline cache and don't have writes_point_size in the prog_data.
Previously we allocated 4kB of push constant space for VS, GS, and PS
(for a total of 12kB) no matter what. This works, but doesn't fully
utilize the space - we have 16kB or 32kB of space.
This makes anv use the same method as brw - divide up the space evenly
among all active shader stages. This means HS and DS would get space,
if those shader stages existed.
In the future, we can probably do better by inspecting how many push
constants each shader stage uses, and weight things accordingly. But
this is strictly better than the old code, and ideally we'd justify
a fancier solution with actual performance data.
Rather than keeping separate {vs,hs,ds,gs}_start fields, we now store an
array indexed by the shader stage (MESA_SHADER_*). The 3DSTATE_URB_*
commands are also sequentially numbered. This makes it easy to just
emit them in a loop.
This simplifies the code a little, and also will make it easier to add
more credible HS and DS code later.
