glsl: add ast/parser support for subroutine parsing storage (v3.2)

This is the guts of the GLSL parser and AST support for
shader subroutines.

The code creates a subroutine type in the parser, and
uses that there to validate the identifiers. The parser
also distinguishes between subroutine types/function prototypes
/uniforms and subroutine defintions for functions.

Then in the AST conversion it recreates the types, and
stores the subroutine definition info or subroutine info
into the ir_function along with a side lookup table in
the parser state. It also converts subroutine calls into
the enhanced ir_call.

v2: move to handling method calls in
function handling not in field selection.
v3: merge Chris's previous parser patches in here, to
make it clearer what's changed in one place.
v3.1: add more documentation, drop unused include
v3.2: drop is_subroutine_def

Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

glsl/ir: allow ir_call to handle subroutine calling

This adds a ir_variable which contains the subroutine uniform
and an array rvalue for the deref of that uniform, these
are stored in the ir_call and lowered later.

Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

glsl/ir: add subroutine information storage to ir_function (v1.1)

We need to store two sets of info into the ir_function,
if this is a function definition with a subroutine list
(subroutine_def) or if it a subroutine prototype.

v1.1: add some more documentation.

Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

mesa: add function to check if shader subroutines are enabled.

This checks if core profile and shader subroutine extension
is enabled.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

mesa: add inline conversion functions for ARB_shader_subroutine (v2)

This handles converting the shader stages to the internal
prefix along with the program resource interfaces.

v2: add tess support

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

glsl: don't eliminate subroutine types.

This stops dead code from removing subroutines types,
we need these for the queries to work properly.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

glsl/types: add new subroutine type (v3.2)

This type will be used to store the name of subroutine types

as in subroutine void myfunc(void);
will store myfunc into a subroutine type.

This is required to the parser can identify a subroutine
type in a uniform decleration as a valid type, and also for
looking up the type later.

Also add contains_subroutine method.

v2: handle subroutine to int comparisons, needed
for lowering pass.
v3: do subroutine to int with it's own IR
operation to avoid hacking on asserts (Kayden)
v3.1: fix warnings in this patch, fix nir,
fix tgsi
v3.2: fixup tests

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>
tests: fix warnings

glsl: Make `subroutine` a reserved keyword

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

dispatch_sanity: add shader subroutine to fix make check

Add the shader subroutine to the core only API list,
and fixup dispatch_sanity to suit.

Acked-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Dave Airlie <airlied@redhat.com>

glsl: Add extension plumbing and define for ARB_shader_subroutine

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

mesa: Add glGet support for ARB_shader_subroutine implementation limits

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

mesa: Add extension tracking for arb_shader_subroutine (v2)

v2: [airlied]: merge version check update.

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

glapi: Add ARB_shader_subroutine functions and enums (v2)

v2: fix output="true" and LENGTH typo

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

mesa: Add stubs for ARB_shader_subroutine entrypoints

Reviewed-by: Tapani Pälli <tapani.palli@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Signed-off-by: Dave Airlie <airlied@redhat.com>

dispatch_sanity.cpp: remove commented out tess entries

These entries were put in the GL4.0 section, so removed the commented
out ones.

Signed-off-by: Dave Airlie <airlied@redhat.com>

glsl/tests: fix varying_test since tess changes.

This fixes make check since the tess changes.

Tested-by: Michel Dänzer <michel.daenzer@amd.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

i965: fix warning since tess merge.

Signed-off-by: Dave Airlie <airlied@redhat.com>

radeonsi: enable tessellation, update GL3.txt & release notes

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add scratch buffer support for tessellation shaders

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: update invariant registers for tessellation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add assertions into draw_vbo and check tessellation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: set the rasterization primitive type for tessellation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: set VGT_LS_HS_CONFIG for tessellation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: update IA_MULTI_VGT_PARAM for tessellation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add derived tessellation state

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: implement a fixed-function tessellation control shader and its state

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: set up a ring buffer for tessellation factors

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add tessellation shader states

ls_rsrc# will be emitted as part of the derived tessellation state

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: update si_get_vs_info and si_get_vs_state for tessellation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add shader code generation for tessellation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: implement TGSI_OPCODE_BARRIER

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: program VGT_SHADER_STAGES_EN for tessellation

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add translation of PATCH primitives

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add support for tessellation shader resources and samplers

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add code for creating, binding and destroying tessellation shaders

This doesn't do anything yet.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: add debug flags for dumping tessellation shaders

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: rework how shader pointers to descriptors are set

This is mainly needed for tessellation where a VS can be bound as VS, ES,
or LS, and TES (tess. evaluationshader) can be bound as VS or ES or neither.
Therefore we need the ability to move pointers to descriptors between
shaders arbitrarily.

The idea is that the context has a mapping from PIPE_SHADER_x to
SPI_SHADER_USER_DATA_x. After a shader is enabled or disabled,
si_shader_change_notify should be called to update this mapping accordingly.

There is a dirty flag for each shader pointer, but only one emit function
for all pointers in the whole context, whose code and logic is separated
from descriptors.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: rename build_streamout_store -> build_tbuffer_store_dwords

It will be reused later.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: separate primitive ID computation

Support for new shader stages will be added here.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: move declaring streamout parameters to its own function

It will be reused later.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

radeonsi: make ES2GS offset sgpr location dynamic

It will have a different location in the tessellation evaluation shader.

Reviewed-by: Michel Dänzer <michel.daenzer@amd.com>

gallium/radeon: expose emit_fetch

Radeonsi will use this.

gallium/radeon: expose LLVM functions implementing emit_store

emit_store will be reimplemented for tessellation control shader outputs
where only radeon_llvm_saturate will be used, but radeonsi will want to
fall back to radeon_llvm_emit_store for other register types.

This exposes both functions.

st/mesa: enable tessellation if the driver supports it

st/mesa: set default tessellation levels

st/mesa: add barrier support

st/mesa: disable copy propagation for tessellation shaders

This can't work due to shared inputs and outputs and barriers.

st/mesa: set vertices_per_patch when drawing

st/mesa: add 2d indexing support to outputs

st/mesa: handle tessellation 2D varyings correctly

st/mesa: lower gl_TessLevel from float[] to vecn

st/mesa: query shader CAPs for tessellation

The MaxTessPatchComponents query added by Marek.

st/mesa: add texture updates for tessellation programs

st/mesa: handle constbufs/ubos for tessellation shaders

st/mesa: add conversion for tessellation shaders

Based on code from Ilia Mirkin <imirkin@alum.mit.edu>.

st/mesa: add tessellation shader states

additional fixes by Marek

mesa: implement GL_IS_PER_PATCH

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: use separate varying slots for patch varyings

The idea is to allow 32 normal varyings and 32 patch varyings,
a total of 64. Previously, only a total of 32 was allowed.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: fix locations of 2-dimensional varyings without varying packing (v2)

v2: renamed producer/consumer_type -> producer/consumer_stage

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: don't demote tess control shader outputs

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: disable varying packing between tessellation shaders

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: allow indexing of gl_out with a non-const if length isn't known

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: allow redeclaration of TCS gl_out[]

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: validate restrictions on use of barrier()

With the exception of always-taken switch cases (which are
indistinguishable from straight line code in our IR), this
disallows use of the builtin barrier() function in all the
places it may not appear.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: allow barrier() in tessellation control shaders

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: analyze TES usage of gl_ClipDistance

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: push vertex count determination down one level

We have the prog here, so we don't need the caller to work this out for
us.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: pass shader stage to lower_output_reads and handle tess control

Tessellation control outputs can be read in directly without first
having been written. Accessing these will require some special logic
anyways, so just let them through.

V2: Never lower tess control output reads, whether patch or not -- both
can be read back by other threads.

Signed-off-by: Ilia Mirkin <imirkin@alum.mit.edu>
Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: properly size unsized arrays in tess stages

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: restrict indexing for writes to TCS outputs to gl_InvocationID

Marek: handle ir_swizzle

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: add builtin constants for ARB_tessellation_shader

Limits from other extensions added by Marek.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: allow nonconst indexing of arrays where we can work out an implicit size

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: relax unsized input/output block arrays for TCS/TES

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Dave Airlie <airlied@redhat.com>

glsl: add the tessellation extension to the list for the "layout" qualifier

This is technically not needed, but it makes the compiler return a better
error message if tessellation is used with GLSL < 1.50.

Instead of:
    error: syntax error, unexpected NEW_IDENTIFIER, expecting $end
It returns:
    error: #version 150 layout qualifier `triangles' used

And the tessellation spec says:
    OpenGL 3.2 and GLSL 1.50 are required.
So it makes perfect sense.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: don't lower variable indexing on non-patch tessellation inputs/outputs

There is no way to lower them, because the array sizes are unknown
at compile time.

Based on a patch from: Fabian Bieler <fabianbieler@fastmail.fm>

v2: add comments

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Dave Airlie <airlied@redhat.com>

glsl: make stand-alone compiler work with tessellation shaders.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: add "in" or "out" prefix to name when flattening interface blocks

This is to prevent a name conflict in tessellation shaders built-in interface
blocks.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Dave Airlie <airlied@redhat.com>

glsl: lower gl_TessLevel* from float[n] to vecn.

Similar to gl_ClipDistance -> gl_ClipDistanceMESA

v2: - renamed is_mesa_var to lowered_builtin_array_variable
    - moved LowerTessLevel into gl_constants
    - cosmetic changes in lower_tess_level.cpp

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: make lower_clip_distance work with tessellation shaders.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Dave Airlie <airlied@redhat.com>

glsl: allow linking of tessellation shaders.

Marek: require a tess eval shader if a tess control shader is present

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Dave Airlie <airlied@redhat.com>

glsl: add the patch in/out qualifier (v2)

v2: Dropped some unrelated reordering in glsl_parser.yy as Ken suggested.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: add tessellation shader defines and built-in variables.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

glsl: add tessellation shader parsing support (v2)

v2: Fixed things that Ken suggested.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: don't allow drawing with tess ctrl shader and without tess eval shader

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: handle tessellation shaders in use_shader_program

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add program interface queries for tessellation shaders

Based on a patch by Chris Forbes <chrisf@ijw.co.nz>.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add misc tessellation shader stuff

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add tessellation shader getters (v3)

Tessellation dependencies added by Marek.

v2: require tessellation in addition to atomics/images for some glGet queries

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: allow setting of patch parameters.

Based on a patch from Fabian Bieler <fabianbieler@fastmail.fm>.
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: require VS if TCS or TES is present in pipeline

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: allow tess stages in glUseProgramStages

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: support tess stages in glGetProgramPipelineiv

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: take tessellation into account when validating GS input primitive mode

I've reported the bug in the Khronos bugzilla.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: allow drawing of patch primitives

Cosmetic changes and fixes by Marek.

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add _mesa_has_tessellation

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add misc tessellation shader support

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add tessellation shader init functions.

Signed-off-by: Chris Forbes <chrisf@ijw.co.nz>
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add tessellation shader state and limits

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add tessellation shader enums

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

mesa: add tessellation shader structs

Marek: remove unused members, cleanup

Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>