nir: strip as we serialize to remove the nir_shader_clone call

Serializing stripped NIR is faster now.

Reviewed-by: Connor Abbott <cwabbott0@gmail.com>

etnaviv: add drm-shim

Signed-off-by: Christian Gmeiner <christian.gmeiner@gmail.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

vk_util: drop duplicate formats in vk_format_map[]

Signed-off-by: Eric Engestrom <eric.engestrom@intel.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Eric Anholt <eric@anholt.net>

turnip: implement UBWC

This enables UBWC for everything except 3D textures.

It breaks many image_to_image copies but those aren't important and it can
be worked around later (image_to_image copy needs to be done in two steps,
decode from the source format and then encode to the destination format).

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Eric Anholt <eric@anholt.net>

freedreno/regs: update UBWC related bits

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Eric Anholt <eric@anholt.net>

swr: Fix build with llvm-10.0.

Fix build error after llvm-10.0 commit 1dfede3122ee ("Move
CodeGenFileType enum to Support/CodeGen.h").

../src/gallium/drivers/swr/rasterizer/jitter/JitManager.cpp: In member function ‘void JitManager::DumpAsm(llvm::Function*, const char*)’:
../src/gallium/drivers/swr/rasterizer/jitter/JitManager.cpp:428:45: error: ‘CGFT_AssemblyFile’ is not a member of ‘llvm::TargetMachine’
             *pMPasses, filestream, nullptr, TargetMachine::CGFT_AssemblyFile);
                                             ^

Signed-off-by: Vinson Lee <vlee@freedesktop.org>
Reviewed-by: Jan Zielinski <jan.zielinski@intel.com>

aco: fix copy+paste error

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>

aco: improve waitcnt insertion around loops

Do this by repeating processing of loops until no progress is made.

Totals from affected shaders:
SGPRS: 162576 -> 162576 (0.00 %)
VGPRS: 145228 -> 145228 (0.00 %)
Spilled SGPRs: 668 -> 668 (0.00 %)
Spilled VGPRs: 0 -> 0 (0.00 %)
Private memory VGPRs: 0 -> 0 (0.00 %)
Scratch size: 0 -> 0 (0.00 %) dwords per thread
Code Size: 15778640 -> 15771336 (-0.05 %) bytes
LDS: 146 -> 146 (0.00 %) blocks
Max Waves: 6087 -> 6087 (0.00 %)

v2: use block_kind_loop_header/block_kind_loop_exit to repeat at the end
    of loops instead of at each continue

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>

freedreno/perfctrs/fdperf: periodically restore counters

When GPU is idle and suspends, the currently selected countables
will all reset to the first one.  So periodically restore the selected
countables.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

freedreno/perfcntrs: add fdperf

Port from the envytools tree, but converted to use the .c tables for
describing the perfcounter groups/countables, rather than using rnndec
to get this at runtime from the register xml.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

freedreno/perfcntrs/a6xx: remove RBBM counters

Currently this are getting blocked by the kernel.. these counters don't
seem to be the most useful ones, and to use them we'd have to somehow
probe the kernel by submitting cmdstream to write the selector regs and
see if that triggers a GPU fault.  So let's just skip them.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

freedreno/perfctrs/a2xx: move CP to be first group

fdperf expects this, to find the ALWAYS_COUNT counter

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

freedreno/perfcntrs: add accessor to get per-gen tables

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

freedreno/perfcntrs: move to shared location

This should eventually be useful for VK_KHR_performance_query as well.
And in the more near term, for fdperf.

Attempt to not break android build is best-effort and untested.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

freedreno/perfcntrs: remove gallium dependencies

Prep work to move to a shared location.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

freedreno/perfcntrs: small cleanup

When we had one gen supporting performance counters, it made sense to
have these builder macros in the .c file with the table.  But time has
come to de-duplicate.

Signed-off-by: Rob Clark <robdclark@chromium.org>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

nir: fix deref offset builder

Use the correct bit size

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

vtn/opencl: add clz support

This is needed for OpenCL

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

nouveau: request ufind_msb64 lowering in the frontend.

This passes the piglit CL builtin-ulong-clz-1.0.generated.cl
test.

Acked-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Karol Herbst <kherbst@redhat.com>

nir: add 64-bit ufind_msb lowering support. (v2)

This adds the option to lower 64-bit ufind_msb opcodes.

v2: use split_x/y removes component loops (Jason)

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

spirv/nir/opencl: handle some multiply instructions.

This adds support for some missing 24-bit and hi multiply
variants.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

spirv: get the correct type for function returns.

This needs to be derived from the address format, not always 1/32.

Suggested by Jason

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

spirv: don't store 0 to cs.ptr_size for non kernel stages.

cs is a union so storing this there is wrong.

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

util: add missing R8G8B8A8_SRGB format to vk_format_map

Signed-off-by: Jonathan Marek <jonathan@marek.ca>
Reviewed-by: Eric Anholt <eric@anholt.net>

docs: fix ascii html representation

v2 (Eric): Use more readable ascii version

Signed-off-by: Elie Tournier <elie.tournier@collabora.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

Docs: remove duplicate meson docs for windows

This block is duplicated, we already have the windows instruction above.

Signed-off-by: Elie Tournier <elie.tournier@collabora.com>
Reviewed-by: Eric Engestrom <eric@engestrom.ch>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

ci: Move freedreno's parallelism to the runner instead of gitlab-ci jobs.

I set the runners to concurrency=1, so they serve only one gitlab-ci job
at at time.  Swap over to using the parallel runner now to keep the
runners busy, more efficiently than spawning many docker containers and
downloading artifacts multiple times, and producing easier-to-understand
results for browsing on the web.

This bumps the a306 runners to 4x parallel instead of 2x like before, but
cheza gles3 drops from 6 to 4.  Current rough timings of the jobs (if no
container download):

db410c-gles2: 5:00
a630-gles2: 1:30
a630-gles3: 6:00
a630-gles31: 5:30

a630-gles3 is a bit longer than I like, but it should come back down once
I can sort out the NIR algebraic rewinding.

glsl: add missing initialization of the location path field

This was apparently missed in 67b32190f3c95, which added support
for ARB_shading_language_include to #line, including the 'path'
field for the location.

Fixes crashes in CTS with all drivers as they attempt to access
an uninitialized path string during parsing.

Fixes: 67b32190f3c95 ("glsl: add ARB_shading_language_include support to #line")
Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2132
Reviewed-by: Timothy Arceri <tarceri@itsqueeze.com>
Reviewed-by: Jose Maria Casanova <jmcasanova@igalia.com>

docs: update features.txt for RADV

[skip ci]

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

gitlab-ci: Directly use host-mapped directory for ccache

Use hardcoded /cache/mesa/ccache for the cache, so it will be shared by
all jobs of all Mesa projects running on the same runner host. This
should increase the hit rate and decrease the worst case storage used.

Further benefits of directly using a host-mapped directory:

* Saves up to ~1 minute per job for restoring and saving the cache
  contents via the GitLab CI cache mechanism
* Cache contents generated by failed jobs are no longer lost
* Jobs running in parallel on the same runner host can get hits from
  each other

Also enable compression, so the default maximum cache size of 5G might
be sufficient.

v2:
* Move CCACHE_DIR variable to the .build-linux template

Suggested-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Eric Anholt <eric@anholt.net> # v1

gitlab-ci: remove now useless meson-swr-glvnd build job

All things are already part of meson-main.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>

gitlab-ci: build GLVND in meson-clang

Building GLVND in meson-main doesn't work because this disables
libEGL and it's needed for running shader-db.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>

gitlab-ci: build swr in meson-main

Now that debugoptimized isn't set and that all test jobs depend on
meson-testing, enabling swr shouldn't slowdown the CI.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>

gitlab-ci: do not build with debugoptimized for meson-main

This should reduce compile time because optimizations are costly.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>

gitlab-ci: add a job that only build things needed for testing

For turnip and RADV testing, we will need a debugoptimized build
without UBSAN. This introduces meson-testing which builds only the
things that are needed by the test stage.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>

gitlab-ci: fix ldd check for Vulkan drivers

The 'dri' directory isn't created when building Vulkan drivers.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>

gitlab-ci: move building piglit into a separate script

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>

pipe-loader: check that the pointer to driconf_xml isn't NULL

This happens when mesa is built with only swrast. The default
driver being kmsro and the default driconf file being v3d,
it's NULL and then strdup crashes.

This fixes a crash with piglit spec/egl_mesa_query_driver/conformance.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Michel Dänzer <mdaenzer@redhat.com>
Reviewed-by: Kristian H. Kristensen <hoegsberg@google.com>

panfrost: Add the lod_bias field

Enough trial and error ... just think even *more* Midgard about where
this field might be!

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

compiler: move build definition of pp_standalone_scaffolding.c

This should fix android build issues while still allowing scons to
build the standalone compiler.

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2129
Reviewed-by: Mark Janes <mark.a.janes@intel.com>

nir/validate: validate num_components on registers and intrinsics

also make 8 and 16 compoments invalid. We will enable that later again
when we actually support it.

v2: fix validation of nir_intrinsic_instr::num_components
    correct validation of instr->num_components

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

Revert "st/mesa: keep serialized NIR instead of nir_shader in st_program"

This reverts commit db0c89d4bffa01ab15dfa819dbb518739131e1a9.

Gitlab: mesa/mesa#2128
Acked-by: Marek Olšák <maraeo@gmail.com>

Revert "st/mesa: call nir_serialize only once per shader"

This reverts commit 3a8d6868897c7dfe72bac09c1eddd551144ca751.

Acked-by: Marek Olšák <maraeo@gmail.com>

lima/ppir: add lod-bias support

Signed-off-by: Arno Messiaen <arnomessiaen@gmail.com>
Reviewed-by: Erico Nunes <nunes.erico@gmail.com>

Revert "i965/fs: Merge CMP and SEL into CSEL on Gen8+"

This reverts commit 52c7df1643ec9af119fd66f916f7fbdbcc798d2d.  The pass,
while clearly useful for some shaders, has at least three bugs that I
was able to find fairly quickly:

 1. It doesn't work for type-converting MOVs because f > 0 is not the
    same as f2i(f) > 0

 2. CSEL is a 3src instruction and only supports one source type; it
    doesn't take this into account and tries to create instructions
    which do a F compare and a D select.  This is especially nasty to
    debug because you don't see that in the dumped assembly because we
    don't properly assert that types are the same in codegen.

 3. While you can handle 2, in theory, by reinterpreting types, you
    can't do that in the presence of source modifiers.  This pass
    doesn't even attempt to detect that.

Those are just the ones I found with the one almost trival shader I was
debugging.  There very likely may be more and.  Best thing to do for now
is just shut it off until someone has the time to figure out how to do
this properly and write tests to ensure it's correct.

Fixes: 3cb085e6d61a "i965/fs: Merge CMP and SEL into CSEL on Gen8+"
Reviewed-by: Brian Paul <brianp@vmware.com>

radv: Enable Subgroup Arithmetic and Clustered for SI

This patch also allows to enable VK_AMD_shader_ballot on SI.

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

amd/llvm: Add Subgroup Scan functions for SI

The idea of this implementation is taken from the ROCm Device Libs:
https://github.com/RadeonOpenCompute/ROCm-Device-Libs/blob/master/ockl/src/wfredscan.cl

Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>

lima/streamparser: Add findings introduced with gl_PointSize

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Andreas Baierl <ichgeh@imkreisrum.de>

lima/streamparser: Fix typo in vs semaphore parser

Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Andreas Baierl <ichgeh@imkreisrum.de>

meson: Fix linkage of libgallium_nine with libgalliumvl

Do not link libgallium_nine with libgalliumvl_stub if it's already
linked with libgalliumvl. Linking with stub leads to "duplicate
symbol" errors.

Fixes: 6b4c7047d57178d3362a710ad503057c6a582ca3
       ("meson: build gallium nine state_tracker")
Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2040
Signed-off-by: Yevhenii Kolesnikov <yevhenii.kolesnikov@globallogic.com>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

docs/release-calendar: Update for extended 19.3 rc period

docs: update calendar, add news item and link release notes for 19.2.5

docs/relnotes/19.2.5: Add SHA256 sum

docs: Add relnotes for 19.2.5

nir/large_constants: use nir_index_vars and nir_variable::index

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>

nir: add nir_variable::index and nir_index_vars

This will be useful as a deterministic identifier/index for the variable.

v2: fix comment style

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com> (v1)

nir: make nir_variable::{num_members,num_state_slots} a uint16_t

Doesn't shrink it (at least, on x86-64) and leaves space for more members.

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Connor Abbott <cwabbott0@gmail.com>

docs: add missing new features for RADV

[skip ci]

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

freedreno/ir3: enable half precision for pre-fs texture fetch

Reviewed-by: Rob Clark <robdclark@gmail.com>

freedreno/ir3: fixup when changing to mad.f16

Reviewed-by: Rob Clark <robdclark@gmail.com>

freedreno/ir3: fix printing output registers of FS.

Fixes: cea39af2fbf1 ("freedreno/ir3: Generalize ir3_shader_disasm()")
Reviewed-by: Rob Clark <robdclark@gmail.com>

freedreno/ir3: Enabling lowering 16-bit flrp

Reviewed-by: Rob Clark <robdclark@gmail.com>

freedreno: support 16b for the sampler opcode

Reviewed-by: Rob Clark <robdclark@gmail.com>

freedreno/ir3: Implement f2b16 and i2b16

Reviewed-by: Rob Clark <robdclark@gmail.com>

freedreno/ir3: Add implementation of nir_op_b16csel

Reviewed-by: Rob Clark <robdclark@gmail.com>

freedreno/ir3: Support 16-bit comparison instructions

v2. [Hyunjun Ko (zzoon@igalia.com)]
Avoid using too much open code like "instr->regs[n]->flags |= FOO"

v3. [Hyunjun Ko (zzoon@igalia.com)]
Remove redundant code for both 16b and 32b operations.

Reviewed-by: Rob Clark <robdclark@gmail.com>

freedreno/ir3: cleanup by removing repeated code

Prep-work for the corresponding patch.

Reviewed-by: Rob Clark <robdclark@gmail.com>

nir/lower_alu_to_scalar: Support lowering 8- and 16-bit reduce ops

Reviewed-by: Rob Clark <robdclark@gmail.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

nir: Add a 8-bit bool type

Adds nir_type_bool8 as well as 8-bit versions of all the bool
opcodes.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

nir: Add a 16-bit bool type

Adds nir_type_bool16 as well as 16-bit versions of all the bool
opcodes.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

nir/opcodes: Add a helper function to generate reduce opcodes

Adds binop_reduce_all_sizes which generates both 1-bit and 32-bit
versions of the reduce operation. This reduces the code duplication a
bit and will make it easier to later add 16-bit versions as well.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

nir/opcodes: Add a helper function to generate the comparison binops

Adds binop_compare_all_sizes which generates both 1-bit and 32-bit
versions of the comparison operation. This reduces the code
duplication a bit and will make it easier to later add 16-bit versions
as well.

Reviewed-by: Rob Clark <robdclark@gmail.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

radv: enable VK_KHR_shader_subgroup_extended_types on GFX6-GFX7

Most of DEQP-VK.subgroups are skipped because 16-bit float aren't
supported but others pass.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

v3d: adds an extra MOV for any sig.ld*

Specifically when we are in non-uniform control flow, as we would need
to set the condition for the last instruction. If (for example) a
image atomic load stores directly their value on a NIR register,
last_inst would be a nop, and would fail when set the condition.

Fixes piglit test:
spec/glsl-es-3.10/execution/cs-ssbo-atomic-if-else-2.shader_test

Fixes: 6281f26f064ada ("v3d: Add support for shader_image_load_store.")
v2: (Changes suggested by Eric Anholt)
   * Cover all sig.ld* signals, not just ldunif and ldtmu, as all of
     them have the same restriction.
   * Update comment explaining why we add a MOV in that case
   * Tweak commit message.

v3:
   * Drop extra set of parens (Eric)
   * Add missing ld signal to is_ld_signal to fix shader-db regression.

Reviewed-by: Eric Anholt <eric@anholt.net>

v3d: Fix predication with atomic image operations

Fixes dEQP test:
dEQP-GLES31.functional.synchronization.inter_call.with_memory_barrier.image_atomic_multiple_interleaved_write_read

Fixes piglit test:
spec/glsl-es-3.10/execution/cs-image-atomic-if-else.shader_test

Fixes: 6281f26f064ada ("v3d: Add support for shader_image_load_store.")
Reviewed-by: Alejandro Piñeiro <apinheiro@igalia.com>
Reviewed-by: Eric Anholt <eric@anholt.net>

panfrost: Don't print the midgard_blend_rt structs on SFBD

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

gitlab-ci: Fix dir name for VK-GL-CTS sources

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Acked-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

panfrost: Rework buffers in SFBD

Support cases such as depth-only renders and only set stencil buffers
when needed, to match the blob's behaviour.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

panfrost: Just print tiler fields as-is for Tx20

The tiler unit in these GPUs is quite different and we haven't reverse
engineered enough of it yet to validate and pretty print it.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>

pan/midgard: Introduce quirks checks

Rather than open-coding checks on gpu_id in the compiler, let's track
quirks applying to whatever we're compiling for, to allow us to manage
the complexity of many heterogenous GPUs in the compiler.

It was discovered that a workaround used on T720 is also required on
T820 (and presumably T830), so let's fix this. This will also decrease
friction as we continue improving T720 support.

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Reviewed-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>

gitlab-ci: update for arb_shading_language_include

gitlab-ci: bump piglit checkout commit

mesa: enable ARB_shading_language_include

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/999
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: implement glCompileShaderIncludeARB()

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: add shader include lookup support for relative paths

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: add support cursor support for relative path shader includes

This will allow us to continue searching the current path for
relative shader includes.

From the ARB_shading_language_include spec:

   "If it is quoted with double quotes in a previously included
   string, then the first search point will be the tree location
   where the previously included string had been found."

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

glsl: delay compilation skip if shader contains an include

If the shader contains an include when need to first run the
preprocessor before deciding if we can skip compilation based
on the shader cache.

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

glsl: add can_skip_compile() helper

We will reuse this in the following commit.

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

glsl: error if #include used while extension is disabled

In other words make sure the shader does this:

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

glsl: add preprocessor #include support

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

glsl: pass gl_context to glcpp_parser_create()

This is a small tidy up and will be useful in the following commit.

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

glsl: add ARB_shading_language_include support to #line

From the ARB_shading_language_include spec:

   "#line must have, after macro substitution, one of the following
    forms:

       #line <line>
       #line <line> <source-string-number>
       #line <line> "<path>"

    where <line> and <source-string-number> are constant integer
    expressions and <path> is a valid string for a path supplied in the
    #include directive. After processing this directive (including its
    new-line), the implementation will behave as if it is compiling at
    line number <line> and source string number <source-string-number>
    or <path> path. Subsequent source strings will be numbered
    sequentially, until another #line directive overrides that
    numbering."

Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: implement glDeleteNamedStringARB()

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: split _mesa_lookup_shader_include() in two

The new local function lookup_shader_include() will be used by
glDeleteNamedStringARB() in the following patch.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: implement glGetNamedStringivARB()

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: implement glIsNamedStringARB()

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: make error checking optional in _mesa_lookup_shader_include()

This will be usefull when implementing glIsNamedStringARB() which
doesn't do error checking, it just returns false for invalid
lookups instead.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: implement glGetNamedStringARB()

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: add glNamedStringARB() support

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>

mesa: add copy_string() helper

This will be used by the various ARB_shading_language_include
functions in the following patches.

Reviewed-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Reviewed-by: Witold Baryluk <witold.baryluk@gmail.com>