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Add "news" section and component status.

Includes an additional deprecation and rationalizing the beginning sections.
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README.md
Also see the Khronos landing page for glslang as a reference front end: # News
https://www.khronos.org/opengles/sdk/tools/Reference-Compiler/ [![Build Status](https://travis-ci.org/KhronosGroup/glslang.svg?branch=master)](https://travis-ci.org/KhronosGroup/glslang)
[![Build status](https://ci.appveyor.com/api/projects/status/q6fi9cb0qnhkla68/branch/master?svg=true)](https://ci.appveyor.com/project/Khronoswebmaster/glslang/branch/master)
The above page includes where to get binaries, and is kept up to date ## Planned Deprecations/Removals
regarding the feature level of glslang.
glslang 1. **SPIRV Folder, 1-May, 2020.** Glslang, when installed through CMake,
======= will install a `SPIRV` folder into `${CMAKE_INSTALL_INCLUDEDIR}`.
This `SPIRV` folder is being moved to `glslang/SPIRV`.
During the transition the `SPIRV` folder will be installed into both locations.
The old install of `SPIRV/` will be removed as a CMake install target no sooner than May 1, 2020.
See issue #1964.
[![Build Status](https://travis-ci.org/KhronosGroup/glslang.svg?branch=master)](https://travis-ci.org/KhronosGroup/glslang) 2. **Visual Studio 2013, 20-July, 2020.** Keeping code compiling for MS Visual Studio 2013 will no longer be
[![Build status](https://ci.appveyor.com/api/projects/status/q6fi9cb0qnhkla68/branch/master?svg=true)](https://ci.appveyor.com/project/Khronoswebmaster/glslang/branch/master) a goal as of July 20, 2020, the fifth anniversary of the release of Visual Studio 2015.
An OpenGL and OpenGL ES shader front end and validator. # Glslang Components and Status
There are several components: There are several components:
1. A GLSL/ESSL front-end for reference validation and translation of GLSL/ESSL into an AST. **Reference Validator and GLSL/ESSL -> AST Front End.** An OpenGL GLSL and OpenGL|ES GLSL (ESSL) front-end for reference validation and translation of GLSL/ESSL into an internal abstract syntax tree (AST).
Status: Virtually complete, with results carrying similar weight as the specifications.
**HLSL -> AST Front End.** An HLSL front-end for translation of an approximation of HLSL to glslang's AST form.
2. An HLSL front-end for translation of a broad generic HLL into the AST. See [issue 362](https://github.com/KhronosGroup/glslang/issues/362) and [issue 701](https://github.com/KhronosGroup/glslang/issues/701) for current status. Status: Partially complete. Semantics are not reference quality and input is not validated.
This is in contrast to the [DXC project](https://github.com/Microsoft/DirectXShaderCompiler), which receives a much larger investment and attempts to have definitive/reference-level semantics.
3. A SPIR-V back end for translating the AST to SPIR-V. See [issue 362](https://github.com/KhronosGroup/glslang/issues/362) and [issue 701](https://github.com/KhronosGroup/glslang/issues/701) for current status.
4. A standalone wrapper, `glslangValidator`, that can be used as a command-line tool for the above. **AST -> SPIR-V Back End.** Translates glslang's AST to the Khronos-specified SPIR-V intermediate language.
How to add a feature protected by a version/extension/stage/profile: See the Status: Virtually complete.
comment in `glslang/MachineIndependent/Versions.cpp`.
**Standalone Wrapper.** `glslangValidator` is command-line tool for accessing the functionality above.
Status: Complete.
Tasks waiting to be done are documented as GitHub issues. Tasks waiting to be done are documented as GitHub issues.
Deprecations ## Other References
------------
Also see the Khronos landing page for glslang as a reference front end:
https://www.khronos.org/opengles/sdk/tools/Reference-Compiler/
The above page, while not kept up to date, includes additional information regarding glslang as a reference validator.
1. GLSLang, when installed through CMake, will install a `SPIRV` folder into # How to Use Glslang
`${CMAKE_INSTALL_INCLUDEDIR}`. This `SPIRV` folder is being moved to
`glslang/SPIRV`. During the transition the `SPIRV` folder will be installed into
both locations. The old install of `SPIRV/` will be removed as a CMake install
target no sooner than May 1, 2020. See issue #1964.
Execution of Standalone Wrapper ## Execution of Standalone Wrapper
-------------------------------
To use the standalone binary form, execute `glslangValidator`, and it will print To use the standalone binary form, execute `glslangValidator`, and it will print
a usage statement. Basic operation is to give it a file containing a shader, a usage statement. Basic operation is to give it a file containing a shader,
...@@ -55,8 +67,7 @@ The applied stage-specific rules are based on the file extension: ...@@ -55,8 +67,7 @@ The applied stage-specific rules are based on the file extension:
There is also a non-shader extension There is also a non-shader extension
* `.conf` for a configuration file of limits, see usage statement for example * `.conf` for a configuration file of limits, see usage statement for example
Building ## Building
--------
Instead of building manually, you can also download the binaries for your Instead of building manually, you can also download the binaries for your
platform directly from the [master-tot release][master-tot-release] on GitHub. platform directly from the [master-tot release][master-tot-release] on GitHub.
...@@ -200,8 +211,7 @@ emcmake cmake -DCMAKE_BUILD_TYPE=Release -DENABLE_GLSLANG_WEB=ON \ ...@@ -200,8 +211,7 @@ emcmake cmake -DCMAKE_BUILD_TYPE=Release -DENABLE_GLSLANG_WEB=ON \
-DENABLE_HLSL=OFF -DBUILD_TESTING=OFF -DENABLE_OPT=OFF -DINSTALL_GTEST=OFF .. -DENABLE_HLSL=OFF -DBUILD_TESTING=OFF -DENABLE_OPT=OFF -DINSTALL_GTEST=OFF ..
``` ```
Building glslang - Using vcpkg ## Building glslang - Using vcpkg
------------------------------
You can download and install glslang using the [vcpkg](https://github.com/Microsoft/vcpkg) dependency manager: You can download and install glslang using the [vcpkg](https://github.com/Microsoft/vcpkg) dependency manager:
...@@ -213,8 +223,7 @@ You can download and install glslang using the [vcpkg](https://github.com/Micros ...@@ -213,8 +223,7 @@ You can download and install glslang using the [vcpkg](https://github.com/Micros
The glslang port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository. The glslang port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.
Testing ## Testing
-------
Right now, there are two test harnesses existing in glslang: one is [Google Right now, there are two test harnesses existing in glslang: one is [Google
Test](gtests/), one is the [`runtests` script](Test/runtests). The former Test](gtests/), one is the [`runtests` script](Test/runtests). The former
...@@ -286,8 +295,7 @@ You can add your own private list of tests, not tracked publicly, by using ...@@ -286,8 +295,7 @@ You can add your own private list of tests, not tracked publicly, by using
`localtestlist` to list non-tracked tests. This is automatically read `localtestlist` to list non-tracked tests. This is automatically read
by `runtests` and included in the `diff` and `bump` process. by `runtests` and included in the `diff` and `bump` process.
Programmatic Interfaces ## Programmatic Interfaces
-----------------------
Another piece of software can programmatically translate shaders to an AST Another piece of software can programmatically translate shaders to an AST
using one of two different interfaces: using one of two different interfaces:
...@@ -352,8 +360,7 @@ ShCompile(shader, compiler) -> compiler(AST) -> <back end> ...@@ -352,8 +360,7 @@ ShCompile(shader, compiler) -> compiler(AST) -> <back end>
In practice, `ShCompile()` takes shader strings, default version, and In practice, `ShCompile()` takes shader strings, default version, and
warning/error and other options for controlling compilation. warning/error and other options for controlling compilation.
Basic Internal Operation ## Basic Internal Operation
------------------------
* Initial lexical analysis is done by the preprocessor in * Initial lexical analysis is done by the preprocessor in
`MachineIndependent/Preprocessor`, and then refined by a GLSL scanner `MachineIndependent/Preprocessor`, and then refined by a GLSL scanner
...@@ -400,6 +407,8 @@ Basic Internal Operation ...@@ -400,6 +407,8 @@ Basic Internal Operation
- the object does not come from the pool, and you have to do normal - the object does not come from the pool, and you have to do normal
C++ memory management of what you `new` C++ memory management of what you `new`
* Features can be protected by version/extension/stage/profile:
See the comment in `glslang/MachineIndependent/Versions.cpp`.
[cmake]: https://cmake.org/ [cmake]: https://cmake.org/
[python]: https://www.python.org/ [python]: https://www.python.org/
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