it doesn't do anything, we have no params. I guess I thought there
would be some, but they all get dead code eliminated even if we try
to make them exist in the first place.
The backend compiler used to do this for us, but after a rebase, it's
now the driver's responsibility. This lets us alter it for say, clip
vertex lowering, at the global level rather than the per-variant level.
we borrow the approach from anv rather than i965, as it works better
with pre-baked state that needs to contain scratch BO addresses
fixes a bunch of varying packing tests
We only can push constants for compute shaders from one range.
Gallium glsl-to-nir (src/mesa/state_tracker/st_glsl_to_nir.cpp) lowers
all uniform accesses to a ubo.
Unfortunately we also load the subgroup-id as a uniform in the
compiler. Since we use the 1 push range for this subgroup-id, we then
lose the ability to actually push the ubo with all the normal user
uniform values.
In other words, there is lots of room for performance improvement, but
at least retrieving the uniforms as pull-constants is functional for
now.
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
the passthrough shader doesn't need a real program string ID - that's
basically used for ARB programs indicating total program source code
changes, or other pre-baked uniform changes, etc...none of which a
passthrough shader has...so we don't need a unique identifier to
distinguish them. We want to use a consistent value so we find
existing passthrough shaders in the cache.
If no TCS is provided, create a "passthrough" TCS that will take the
default values set in the API as constants and pass to the TES, along
with any other inputs it expects. The code to create the NIR shader
is the same as in i965.
Tested with
./piglit run -t 'tess' quick_shader r
and fixed a dozen crashes from that list.
not sure why this is labeled const, I'm pretty sure we are taking the
reference and owning this, so there's no particular reason we can't
change it. it certainly seems to be working for non-compute. and,
freedreno's ir3_shader.c seems to do this as well. still...gross :/
some of them had typos, didn't say 'authors or copyright holders',
or other mistakes. This is now https://opensource.org/licenses/MIT
text, formatted consistently.
looking at the freedreno code, this is totally unnecessary! we can just
store the NIR and be happy, and not have any vestiges of TGSI.
plus we can reuse this structure for compute shaders, without needing a
pipe_compute_state base.
not sure how useful this really is...
./bin/ext_transform_feedback-tessellation triangles flat_first
is hitting a case where we rebind the same VS program, but with
different streamout info...which isn't in the key...but is in the
cache...so we don't rebuild it...
