HLSL: Add support for printf().

Translate printf() to what GL_EXT_debug_printf has done. HLSL could
define non-constant string variable and we don't have such features
in SPIR-V, so just support constant string variable.

Fix GN build and presubmits

Add missing `.cfg` files for GN presubmit.
Add missing `recursedeps` in the `DEPS` file.
Call `./update_glslang_sources.py` before attempting to build.
Add more GN spew to the `.gitignore` file.

Kokoro: Add configurations for GN presubmit

Add GL_EXT_fragment_shading_rate

Issue: #2421

Add basic GN configurations

TIntermediate was constructed without initializing any of the `resources` fields,
and `TProgram::linkStage()` was not calling `TIntermediate::setLimits()`
after constructing new `TIntermediate`s for non-first stages.

Fields of `resources` were then read in `TIntermediate::finalCheck()`
triggering undefined behavior.

This CL makes three changes:
(1) `TIntermediate::setLimits()` is now called for non-first stages by
    copying the `firstIntermediate`'s limits. This ensures that the
    `resources` fields is initialized, fixing the bug.
(2) `TIntermediate::resources` is now wrapped in a `MustBeAssigned<>`
    helper struct, asserting in non-release builds that this field is
    always initialized before reading.
(3) `TIntermediate::resources` is now zero-initialized, so that if
    the `TIntermediate::resources` field is not set in a release build
    (and so the `assert()` will be disabled) behavior is still
    deterministic.

Fixes #2423

This allows glslang to be build standalone using the gn build system.

To build with gn:

```
gclient sync --gclientfile=standalone.gclient
gn gen out/default
cd out/default
ninja
```

disassemble.cpp appears not to be using anything from SpvTools.h, but the inclusion of it prevents standalone building of the SPIR-V portion (for instance, when needed purely for generation and disassembly) without SPIRV-Tools dependency.

This is based on spv.paramMemory.frag.out which exercises the
writeonly storage image case.

This appears to need desktop GLSL.

The generated SPIR-V fails validation because the image_write function
takes a parameter which is pointer to an OpTypeImage with Unknown format.
But the parameters passed in are pointer to OpTypeImage with formats Rgba32f
and Rgba16f. The validator rejects this, saying the parameter types must
match.

Revert "Add new SpirvToolsDisassemble API interface + Improve Doc on existing API interface (#2408)"

See issue #2413.

This reverts commit d1929f35.

* Add more flexible SpirvToolsDisassemble interface to allow specifying spv_target_env for disassembly output.
Improve documentation on existing SpirvToolsDisassemble interface.

* Update pre-processor check - following existing ENABLE_OPT checks.

* Fix not-found header paths for glslangValidator and glslangtests.

Revert "Add more flexible SpirvToolsDisassemble interface to allow specifying spv_target_env for disassembly output. (#2406)"

This reverts commit 2eed8236.

Add more flexible SpirvToolsDisassemble interface to allow specifying spv_target_env for disassembly output. (#2406)

Improve documentation on existing SpirvToolsDisassemble interface.
Fix cmake build scripts to account for `spirv-tools` external when -DENABLE_OPT=ON

There's a statement that intends to generate a 32-bit hashcode, but due
to integer promotion, the intermediate values can trigger signed integer
overflow, which is undefined behavior.

To avoid this, cast at least one operand to unsigned int before
multiplying, which will cause the result to be promoted to unsigned int
instead of signed int.

With this patch, I'm able to build core for qemu-x64 with host_asan-ubsan.

Fixed: 60128
Change-Id: Idd644e534116bf29dca8013936ac39901bbe68fc
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/glslang/+/428254Reviewed-by: John Bauman <jbauman@google.com>
Co-authored-by: Drew Fisher <zarvox@google.com>

The glslang public includes dir contains headers with implicit
conversion issues. Add -Wno-conversion to glslang's public config.

Bug: 60140
Bug: 58162
Change-Id: Iec27cb4242e9fdceddd6a3e02044a0bccfa0ce36
Reviewed-on: https://fuchsia-review.googlesource.com/c/third_party/glslang/+/429054Reviewed-by: Petr Hosek <phosek@google.com>
Co-authored-by: Shai Barack <shayba@google.com>

Add more builder functions to OpExecutionMode, OpExecutionModeId,
OpDecorateString, OpMemberDecorateString.

According to SPIR-V, OpExecutionMode and OpExecutionModeId could
take variable extra operands. Current implementation doesn't support
this and assumes at most 3 operands are extra operands. It is not
true. Similarly, OpDecorateString and OpMemberDecorateString could
support multiple strings either as literal strings or as string
operands. Further, OpDecorate and OpDecorateId have the same problem,
taking variable extra operands.

* Preprocessor related fix

1). Accoding to ESSL spec : All macro names containing two consecutive underscores ( __ ) are reserved for future use as predefined macro names, so just report a warning instead of error when the shader defines the macro names begining with  '__';

2. According to spec:  If an implementation does not recognize the tokens following #pragma, then it will ignore that pragma, so report a compile-time warning intead of error for the following statement:
#pragma debug(1.23)

3. The 'defined' macro should be allowed to expand and '__LINE__' should be allowed to be replaced with its original line number (otherwise, other expanding macros may change this value).

4. Add a flag 'indentifierSeen' in PPContext to indicate whether the any non-preprocessor tokens is existed before the extension directives, because the built-in symbols and functions are parsed before paring the user shader, so add a 'shaderSource' flag to check this error only for the user shader source;

5. Add missing type int16 and uint16.

* Add test results, remove restriction of #extension.

1. Remove extension restriction in first line , as this is contraversy now.

2. The following shader is compiled failed as glslang consider the keyword 'defined' can not be undefined(in the 9th line: "#define defined BBB")
The shader is as following:
According to ES3.0 spec: It is an error to undefine or to redefine a built-in (pre-defined) macro name.
This rule is aimed to the  __LINE__,  __FILE__, __VERSION__ and  GL_ES,
the keyword "defined" should not be restricted by this rule,
so change the compile error to warning and make the following shader compile successfully.

* 1. Using relaxedError to control error/warning report level. 2. remove #extension restriction. 3. Fix version related issue.

1. Using relaxedError to control error/warning report level. 2. remove #extension restriction. 3. Fix version related issue.

* Add test results

* Turn conditional warnings about pragma to unconditional ones.

According to the extension SPV_GOOGLE_decorate_string,
OpDecorateString (or OpMemberDecorateString) ought to be capable of
supporting multiple literal strings. Each literal strings are padded
with null terminator to make word alignment. The layout is:

  Inst | Target | Decoration | Literal String, Literal String, ...

* Remove image2DShadow and other 3 tokens. Refine codes.

Remove image2DShadow and other 3 tokens. Refine codes.

* 110scope.vert has redefinition part of what's removed from 100scope.vert

Allow subpassLoad for ANGLE

Find python interpreter from host when cross-compiling

Signed-off-by: Shahbaz Youssefi <ShabbyX@gmail.com>

Error when initializing rayQuery with assignment

Parser: Fix wrong names of extension macros

SPIRV: Fix some disassembly issues

- OpExecutionModeId is not supported in disassembly.
- Some execution modes are missing in disassembled strings.

The names of some extension macros are wrong because of coding typos.