Instead of having separate lists of variables, roughly sorted by mode,
use a single list for all shader-level NIR variables. This makes a few
list walks a bit longer here and there but list walks aren't a very
common thing in NIR at all. On the other hand, it makes a lot of things
like validation, printing, etc. way simpler. Also, there are a number
of cases where we move variables from inputs/outputs to globals and this
makes it way easier because we no longer have to move them between
lists. We only have to deal with that if moving them from the shader to
a nir_function_impl.
Reviewed-by: Rob Clark <robdclark@chromium.org>
Reviewed-By: Mike Blumenkrantz <michael.blumenkrantz@gmail.com>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5966>
This one's a bit more complex because it filters off only those
variables with mode == nir_var_uniform. As such, it's not exactly a
drop-in replacement for nir_foreach_variable(var, &nir->uniforms).
Reviewed-by: Gert Wollny <gert.wollny@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5966>
When updating the shader info used by GL for the API we must
remember to make sure to restore the pointers to its own name
and label strings. There are a number of ways in which the nir
copy of these strings can be freed before GL is finished with
them.
Fixes: 36be8c2fcf ("st/glsl_to_nir: use nir_shader_gather_info()")
Closes: https://gitlab.freedesktop.org/mesa/mesa/-/issues/2875
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/5488>
This allows us to do API specific checks before removing variable
without filling nir_remove_dead_variables() with API specific code.
In the following patches we will use this to support the removal
of dead uniforms in GLSL.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Eric Anholt <eric@anholt.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4797>
The deref stuff is hard to handle in a backend supporting dynamic
indexing, while the lowering can easily turn that into the same kind of
dynamic indexing we do for textures, UBOs, and SSBOs.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3728>
The arguments passed in were:
- prog->info.num_ssbos
- prog->nir->info.num_ssbos
- arbitrary values for standalone compilers
The num_ssbos should match between the prog's info and prog->nir's info
until this lowering happens.
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3240>
We carve out half the SSBO space for atomics, and we were just binding
them way up there. freedreno was then using a remapping table to map the
sparse buffer index back down, since space in the descriptor array is a
shared resource that may limit parallelism. That remapping table
generated inside of the ir3 compiler is getting thoroughly in the way of
implementing vulkan descriptor sets.
We will be able to get rid of the freedreno's remapping table, and
hopefully save shared resources on other hardware, by packing the atomics
tightly above the SSBOs (like i965 does). We already rebind the shader
buffers on program change if either the old or new program has SSBOs or
ABOs, so this doesn't necessarily increase the program state change cost
(the only cost increase I can come up with is if you're using the same
atomic counter without rebinding it across changes of programs with
varying SSBO counts, meaning it would now bounce around index space).
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3240>
Gallium arbitrarily (it seems) put atomics below SSBOs, resulting in a
bunch of extra index management, and surprising shader code when you would
see your SSBOs up at index 16. It makes a lot more sense to see atomics
converted to SSBOs appear as magic high numbers.
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3240>
To implement NIR-to-TGSI, we need to be able to get the size of the
uniform variable for the TGSI declaration, not just the
.driver_location. With its location in mesa/st, drivers couldn't link
to it from nir-to-tgsi.
This feels like a common enough function to want, so let's share it in
the core compiler.
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3297>
The only bit that gallium varied on was handling of bindless. We can
retain previous behavior for count_attribute_slots() by passing in
"true" (though I suspect this is just giving a silly answer to a silly
question), and delete our recursive function from mesa/st.
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3297>
This is a cleanup but also a fix for commit dd09f1d806. In case of
i965 we did not actually create hash for cached shader programs.
Fixes: dd09f1d806 "mesa/st/i965: add a ProgramResourceHash for quicker resource lookup"
Signed-off-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
A NIR based glsl linking function will be too different to the
spirv version to bother attempting any sharing. So lets change
the name to be explicit.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
The gl_nir_lower_buffers pass relies on recognizing the same literal
constants as the GLSL compiler so that constant buffer array indices
are constant in nir as well. Without this, get_block_array_index()
would see
vec1 32 ssa_723 = deref_var &const_temp@1 (function_temp int)
vec1 32 ssa_724 = load_const (0x00000001 /* 0.000000 */)
...
vec1 32 ssa_5 = deref_var &const_temp@1 (function_temp int)
vec1 32 ssa_6 = intrinsic load_deref (ssa_5) (0) /* access=0 */
vec1 32 ssa_7 = deref_var &blockB (ssbo BlockB[1])
vec1 32 ssa_8 = deref_array &(*ssa_7)[ssa_6] (ssbo BlockB) /* &blockB[ssa_6] */
instead of a literal 1, and ultimately generate the block name
BlockB[0]. That used to work, since we before the previous commits
we'd compact the block binding points and names. Thus, there would
always be a BlockB[0].
Now, if an entry in a block array isn't used, we don't generate that
block name, which means that if entry 0 isn't used BlockB[0] isn't
present and then get_block_array_index() fails to find the block.
In most cases we would have dealt with this in the call to
st_nir_opts() in st_nir_link_shaders(), but in the num_shaders == 1
case (for example, compute) we would call gl_nir_lower_buffers()
before we lowered GLSL constants. Move that corner case up next to
where we call st_nir_link_shaders() so we call st_nir_opts() at the
same point in the flow for all shaders.
Fixes: dEQP-GLES31.functional.ssbo.layout.random.all_per_block_buffers.18
Signed-off-by: Kristian H. Kristensen <hoegsberg@google.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
i965 and iris use inputs_read/outputs_written for a shader stage to
determine the layout of input and output storage. Adjacent stages must
agree on the layout, so adjacent input/output bitfields must match.
This patch adds a new nir_shader_compiler_options::unify_interfaces
flag which asks the linker to unify the input/output interfaces between
adjacent stages.
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3249>
Here we use the NIR based builder to add everything to the resource
list execpt for SSO packed varyings. Since the details of those
varyings get lost during packing we leave the special handing to
the GLSL IR pass for now. In order to do this we add some bools
to the build resource list functions.
Using the NIR based resource list builder gets us a step closer to
using a native NIR based linker. It should also be faster than the
GLSL IR builder, one because the NIR optimisations should mean we
add less entries due to better optimisations, and two because nir
gives us better lists to work with and we don't need to walk the
entire IR to find the resources.
Ack-by: Alejandro Piñeiro <apinheiro@igalia.com>
In a following commit we will use a NIR based builder to build the
OpenGL resource list, so we want to delay this call a little.
Ack-by: Alejandro Piñeiro <apinheiro@igalia.com>
In order to be able to implement a NIR based glsl linker we need to
build the program resource list with NIR. This change delays the
remaping so that a later commit can call the NIR based resource
list builder.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
a later commit will add back st_vertex_program as a subclass of
st_common_program
Acked-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Commit "1c2bf82d24a glsl: disable lower_fragdata_array() for NIR drivers"
disabled the GLSL IR lowering that turned gl_FragData from an array into a
collection of scalar outputs under the assumption that this was already being
handled properly elsewhere, however there are some corner cases where NIR
would fail to do this, leaving gl_FragData[] as an array variable. This can
break backends that assume that all their outputs will be scalar and use the
variable definitions from the shader to do their output setup, such as the
case of V3D.
At least one corner case was found in some Portal shaders from shader-db, where
NIR would optimize out the full body of a fragment shader. In this scenario,
the empty shader would keep the original array definition of gl_FragData[],
causing the backend to assert.
We need to do this late enough for it to be effective, since doing it in
st_nir_preprocess does not fix the original problem.
Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2091
Fixes: 1c2bf82d ("glsl: disable lower_fragdata_array() for NIR drivers")
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This will allow us to stop lowering gl_FragData in GLSL IR for NIR
drivers which means we won't need the special GLSL IR type
handling for building the resource list in a NIR based linker.
i965 has been doing this since b828f7a27b.
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
The removed st_nir_opts calls are mostly redundant.
There is an improvement with shader-db on radeonsi:
Before:
real 1m54.047s
user 28m37.857s
sys 0m7.573s
After:
real 1m52.012s
user 28m3.412s
sys 0m7.808s
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
This brings back the fallback previously present in
st_nir_lookup_parameter_index(): if there's no parameter associated
with the variable, use a parameter from a variable with the same
prefix.
We'll have to sort out something for SPIR-V, but in the meantime let's
fix GLSL.
Fixes: b6384e57f5 ("mesa/st: Lookup parameters without using names")
Reviewed-by: Eric Anholt <eric@anholt.net>
Tested-by: Eric Anholt <eric@anholt.net>
IIRC, designated initializers are not legal C++.
Fixes the MSVC build.
Fixes: 83fd1e58 ("glsl/nir: Add and use a gl_nir_link() function")
Reviewed-by: Neha Bhende <bhenden@vmware.com>
Perform all the NIR linking steps in order. Change iris and i965 to
use it. Suggested by Alejandro.
v2: Add gl_nir_linker_options struct.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com> [v1]
There's no such case, if we load prog->nir from the shader cache, we
shouldn't hit this path.
Suggested-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
The SPIR-V codepath uses NIR linking, so we have to preprocess after
the linking steps, which makes things slightly different than GLSL.
To make more clear when the preprocess is happening, I've ended up
inlining st_nir_get_mesa_program() into its caller.
The goal was to make both GLSL and SPIR-V to use the same preprocess
function, the exceptions are:
- SPIR-V codepath don't support NIR state slots yet;
- GLSL lowers shared memory early, so we don't do the deref lowering
for those.
For now I didn't bother to rename other functions and files (now that
many of them apply to both GLSL and SPIR-V), but we should do this in
further patches.
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Refactor to split the glsl_to_nir conversion from the preprocessing
NIR passes into separate functions, so we can use them in SPIR-V.
Unlike in GLSL, there we'll need to perform a few passes with the NIR
linker before doing the individual preprocess calls.
No behavior should change with this patch.
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Use the new MainUniformStorageIndex field in Parameter instead. It
was added so we could match those in the SPIR-V case, where names are
optional.
v2: Use MainUniformStorageIndex for all cases.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com> [v1]
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Every uniform that have the "gl_" name also have some state slots. So
use the state_slots like we did in 57b6184931 ("i965: account for NIR
uniforms without name").
This removes the dependency on names, which are optional when using
ARB_gl_spirv.
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Set of opcodes doesn't have enough flexibility in certain cases. E.g.
Utgard PP has vector conditional select operation, but condition is always
scalar. Lowering all the vector selects to scalar increases instruction
number, so we need a way to filter only those ops that can't be handled
in hardware.
Reviewed-by: Qiang Yu <yuq825@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Signed-off-by: Vasily Khoruzhick <anarsoul@gmail.com>
This prevents regressions when disabling indirect lowering. Sometimes
the only use of an input array was copying it to the array created by
nir_lower_io_to_temporaries, and without lowering indirects we wouldn't
have eliminated the temporary array until after linking, which was too
late to remove unused code in the producer.
No shader-db changes with radeonsi NIR.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Now that the 64-bit lowering passes do a complete lowering in one go, we
don't need to loop anymore. We do, however, have to ensure that int64
lowering happens after double lowering because double lowering can
produce int64 ops.
Reviewed-by: Eric Anholt <eric@anholt.net>
We were recompiling the softfp64 library of functions from GLSL to NIR
every time we compiled a shader that used fp64. Worse, we were ralloc
stealing it to the GL context. This meant that we'd accumulate lots of
copies for the lifetime of the context, which was a big space leak.
Instead, we can simply stash a single copy in the GL context, and use
it for subsequent compiles. Having a single copy should be fine from
a memory context point of view: nir_inline_function_impl already clones
the necessary nir_function_impl's as it inlines.
KHR-GL45.enhanced_layouts.ssb_member_align_non_power_of_2 was previously
OOM'ing a system with 16GB of RAM when using softfp64. Now it finishes
much more quickly and uses only ~200MB of RAM.
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
It isn't really doing anything Gallium-specific, and it's needed for
handling component packing, overlapping, etc.
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
We scalarize IO to enable further optimizations, such as propagating
constant components across shaders, eliminating dead components, and
so on. This patch attempts to re-vectorize those operations after
the varying optimizations are done.
Intel GPUs are a scalar architecture, but IO operations work on whole
vec4's at a time, so we'd prefer to have a single IO load per vector
rather than 4 scalar IO loads. This re-vectorization can help a lot.
Broadcom GPUs, however, really do want scalar IO. radeonsi may want
this, or may want to leave it to LLVM. So, we make a new flag in the
NIR compiler options struct, and key it off of that, allowing drivers
to pick. (It's a bit awkward because we have per-stage settings, but
this is about IO between two stages...but I expect drivers to globally
prefer one way or the other. We can adjust later if needed.)
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
This can be used by both etnaviv and freedreno/a2xx as they are both vec4
architectures with some instructions being scalar-only.
Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
I don't know why I thought NIR_PASS always set the progress variable.
Derp.
Fixes: d41cdef2a5 ("nir: Use the flrp lowering pass instead of nir_opt_algebraic")
Reviewed-by: Brian Paul <brianp@vmware.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Emil Velikov <emil.velikov@collabora.com>
Coverity CID: 1444996
Coverity CID: 1444995
Coverity CID: 1444994
Coverity CID: 1444993
Coverity CID: 1444991
Coverity CID: 1444989
I tried to be very careful while updating all the various drivers, but I
don't have any of that hardware for testing. :(
i965 is the only platform that sets always_precise = true, and it is
only set true for fragment shaders. Gen4 and Gen5 both set lower_flrp32
only for vertex shaders. For fragment shaders, nir_op_flrp is lowered
during code generation as a(1-c)+bc. On all other platforms 64-bit
nir_op_flrp and on Gen11 32-bit nir_op_flrp are lowered using the old
nir_opt_algebraic method.
No changes on any other Intel platforms.
v2: Add panfrost changes.
Iron Lake and GM45 had similar results. (Iron Lake shown)
total cycles in shared programs: 188647754 -> 188647748 (<.01%)
cycles in affected programs: 5096 -> 5090 (-0.12%)
helped: 3
HURT: 0
helped stats (abs) min: 2 max: 2 x̄: 2.00 x̃: 2
helped stats (rel) min: 0.12% max: 0.12% x̄: 0.12% x̃: 0.12%
Reviewed-by: Matt Turner <mattst88@gmail.com>
PIPE_CAP_PACKED_UNIFORMS conflates several things: Lowering uniforms i/o
at the st level instead of the backend, packing uniforms with no padding
at all, and lowering to UBOs.
Requiring backends to lower uniforms i/o for !PIPE_CAP_PACKED_UNIFORMS
leads to the driver needing to either link against the type size function
in mesa/st, or duplicating it in the backend. Given that all backends
want this lower-io as far as I can tell, just move it to mesa/st to
resolve the link issue and avoid the driver author needing to understand
st's uniforms layout.
Incidentally, fixes uniform layout failures in nouveau in:
dEQP-GLES2.functional.shaders.struct.uniform.sampler_nested_fragment
dEQP-GLES2.functional.shaders.struct.uniform.sampler_nested_vertex
dEQP-GLES2.functional.shaders.struct.uniform.sampler_array_fragment
dEQP-GLES2.functional.shaders.struct.uniform.sampler_array_vertex
and I think in Lima as well.
v2: fix indents
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
When I implemented opt_if_loop_last_continue() I had restricted
this pass from moving other if-statements inside the branch opposite
the continue. At the time it was causing a bunch of spilling in
shader-db for i965.
However Samuel Pitoiset noticed that making this pass more aggressive
significantly improved the performance of Doom on RADV. Below are
the statistics he gathered.
28717 shaders in 14931 tests
Totals:
SGPRS: 1267317 -> 1267549 (0.02 %)
VGPRS: 896876 -> 895920 (-0.11 %)
Spilled SGPRs: 24701 -> 26367 (6.74 %)
Code Size: 48379452 -> 48507880 (0.27 %) bytes
Max Waves: 241159 -> 241190 (0.01 %)
Totals from affected shaders:
SGPRS: 23584 -> 23816 (0.98 %)
VGPRS: 25908 -> 24952 (-3.69 %)
Spilled SGPRs: 503 -> 2169 (331.21 %)
Code Size: 2471392 -> 2599820 (5.20 %) bytes
Max Waves: 586 -> 617 (5.29 %)
The codesize increases is related to Wolfenstein II it seems largely
due to an increase in phis rather than the existing jumps.
This gives +10% FPS with Doom on my Vega56.
Rhys Perry also benchmarked Doom on his VEGA64:
Before: 72.53 FPS
After: 80.77 FPS
v2: disable pass on non-AMD drivers
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com> (v1)
Acked-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
i965 does this, and st's tgsi path does this. st/nir did not.
Cuts 138MB of memory from a DiRT Rally trace, which is about 44%
of the total GLSL IR memory.
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
We don't need to determine the number of uniform slots here, it's
already available as prog->Parameters->NumParameterValues. The way we
previously determined the number of slots was also broken for
PackedDriverUniformStorage, where we would add loc (in dwords) and
type_size() (in vec4s).
Signed-off-by: Kristian H. Kristensen <hoegsberg@chromium.org>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Rob Clark <robdclark@gmail.com>
This fixes a segfault when we try to access the array using a
-1 when the array wasn't allocated in the first place.
Before 7536af670b we would just access a pre-allocated array
that was also load/stored to/from the shader cache. But now the
cache will no longer allocate these arrays if they are empty.
The change resulted in tests such as the following segfaulting
when run with a warm shader cache.
tests/spec/arb_arrays_of_arrays/execution/sampler/fs-struct-const-index.shader_test
glsl_to_nir() is still missing support for converting certain
functions to NIR, so for those we use the GLSL IR optimisations
to remove the functions.
Reviewed-by: Eric Anholt <eric@anholt.net>
Now that we have a loop unrolling cost function and loop unrolling isn't
going to kill us the moment we have a 64-bit op in a loop, we can go
ahead and move 64-bit lowering later. This gives us the opportunity to
do more optimizations and actually let the full optimizer run even on
64-bit ops rather than hoping one round of opt_algebraic will fix
everything. This substantially reduces both fp64 shader compile times
and the resulting code size.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Instead of trusting the caller to already have created a softfp64
function shader and added all its functions to our shader, we simply
take the softfp64 shader as an argument and do the function inlining
ouselves. This means that there's no more nasty functions lying around
that the caller needs to worry about cleaning up.
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Note that locations can be set in different units, and the multiplier
argument caters to supporting these different units. For example,
st_glsl_to_nir uses dwords (4 bytes) so the multiplier should be 4,
while tgsi_to_nir uses bytes, so the multiplier should be 16.
Signed-Off-By: Timur Kristóf <timur.kristof@gmail.com>
Tested-by: Andre Heider <a.heider@gmail.com>
Tested-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
The nir_lower_uniforms_to_ubo function is useful outside of
mesa/state_tracker, and in fact is needed to produce NIR for
drivers that have the PIPE_CAP_PACKED_UNIFORMS capability.
Signed-Off-By: Timur Kristóf <timur.kristof@gmail.com>
Tested-by: Andre Heider <a.heider@gmail.com>
Tested-by: Rob Clark <robdclark@gmail.com>
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
This might enough for iris and possible r600 (when it gets NIR)
This appears to work for iris.
v2:
* change cap return so DOUBLES == 2 means sw emu
v3:
* Refactor using int64/doubles lowering options which were added
into nir options
* Remove DOUBLES == 2 added in v2
[jordan: Remove "2" value on PIPE_CAP_DOUBLES]
[jordan: Use lowering options added to nir options]
Signed-off-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Eric and I would like a bitmask of which samplers are used, similar to
prog->SamplersUsed, but available in NIR. The linker uses SamplersUsed
for resource limit checking, but later optimizations may eliminate more
samplers. So instead of propagating it through, we gather a new one.
While there, we also gather the existing textures_used_by_txf bitmask.
Gathering these bitfields in nir_shader_gather_info is awkward at best.
The main reason is that it introduces an ordering dependency between the
two passes. If gathering runs before lower_samplers_as_deref, it can't
look at var->data.binding. If the driver doesn't use the full lowering
to texture_index/texture_array_size (like radeonsi), then the gathering
can't use those fields. Gathering might be run early /and/ late, first
to get varying info, and later to update it after variant lowering. At
this point, should gathering work on pre-lowered or post-lowered code?
Pre-lowered is also harder due to the presence of structure types.
Just doing the gathering when we do the lowering alleviates these
ordering problems. This fixes ordering issues in i965 and makes the
txf info gathering work for radeonsi (though they don't use it).
Reviewed-by: Eric Anholt <eric@anholt.net>
Jason Ekstrand
Timothy Arceri
Connor Abbott
Tapani Pälli
Eric Anholt
Danylo Piliaiev
Kristian H. Kristensen
Gert Wollny
Kenneth Graunke
Marek Olšák
Iago Toral Quiroga
Caio Marcelo de Oliveira Filho
Brian Paul
Vasily Khoruzhick
Jonathan Marek
Ian Romanick
Rob Clark
Kristian H. Kristensen
Jason Ekstrand
Timur Kristóf
Dave Airlie