kc3-lang/angle/doc/DevSetup.md

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• Hash : 1cd52d2c
  Author :
  Date : 2020-02-18T15:28:29
  

  docs: Document how to use ANGLE on Android
  
  This CL creates a new page that is dedicated to building and using
  ANGLE for Android.
  
  With Android 10 released, now anyone can try out ANGLE as their GLES
  driver for debuggable apps. It can also be loaded for any app if the
  user has root access.
  
  Also migrated existing Android build instructions with updates from
  the team.
  
  Bug: angleproject:4347
  Change-Id: Iead6a456780aba033a1227605f197a456ad30eb3
  Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2063569
  Reviewed-by: Cody Northrop <cnorthrop@google.com>
  Commit-Queue: Cody Northrop <cnorthrop@google.com>
  

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git clone https://chromium.googlesource.com/angle/angle
cd angle
python scripts/bootstrap.py
gclient sync
git checkout master

./build/install-build-deps.sh

gn gen out/Debug

target_cpu = "x86"        (default is "x64")
is_clang = false          (to use system default compiler instead of clang)
is_debug = true           (enable debugging, true is the default)
dcheck_always_on = true   (enable release asserts and debug layers)

autoninja -C out/Debug
autoninja -C out/Release

gn gen out/Debug --sln=angle-debug --ide=vs2019

Source

• doc/DevSetup.md

• # ANGLE Development
  
  ANGLE provides OpenGL ES 3.1 and EGL 1.5 libraries and tests. You can use these to build and run OpenGL ES applications on Windows, Linux, Mac and Android.
  
  ## Development setup
  
  ### Version Control
  ANGLE uses git for version control. Helpful documentation can be found at [http://git-scm.com/documentation](http://git-scm.com/documentation).
  
  ### Required Tools
  On all platforms:
  
   * [depot_tools](https://commondatastorage.googleapis.com/chrome-infra-docs/flat/depot_tools/docs/html/depot_tools_tutorial.html#_setting_up)
     * Required to download dependencies (with gclient), generate build files (with GN), and compile ANGLE (with ninja).
     * Ensure `depot_tools` is in your path as it provides ninja for compilation.
   * For Googlers, run `download_from_google_storage --config` to login to Google Storage.
  
  On Windows:
  
   * ***IMPORTANT: Set `DEPOT_TOOLS_WIN_TOOLCHAIN=0` in your environment if you are not a Googler.***
   * [Visual Studio Community 2019](https://visualstudio.microsoft.com/vs/)
   * [Windows 10 Standalone SDK version 10.0.17134 exactly](https://developer.microsoft.com/en-us/windows/downloads/windows-10-sdk).
     * You should install it through Visual Studio Installer if available.
     * Comes with additional features that aid development, such as the Debug runtime for D3D11. Required for the D3D Compiler DLL.
   * (optional) See the [Chromium Windows build instructions](https://chromium.googlesource.com/chromium/src/+/master/docs/windows_build_instructions.md) for more info.
  
  On Linux:
  
   * Install package dependencies by running `install-build-deps.sh` later on.
   * Bison and flex are not needed as we only support generating the translator grammar on Windows.
  
  On MacOS:
  
   * [XCode](https://developer.apple.com/xcode/) for Clang and development files.
   * Bison and flex are not needed as we only support generating the translator grammar on Windows.
  
  ### Getting the source
  
  ```
  git clone https://chromium.googlesource.com/angle/angle
  cd angle
  python scripts/bootstrap.py
  gclient sync
  git checkout master
  ```
  
  On Linux only, you need to install all the necessary dependencies before going further by running this command:
  ```
  ./build/install-build-deps.sh
  ```
  
  After this completes successfully, you are ready to generate the ninja files:
  ```
  gn gen out/Debug
  ```
  
  On Windows only, ensure you **set `DEPOT_TOOLS_WIN_TOOLCHAIN=0` in your environment** (if you are not a Googler).
  
  GN will generate ninja files. To change the default build options run `gn args out/Debug`.  Some commonly used options are:
  ```
  target_cpu = "x86"        (default is "x64")
  is_clang = false          (to use system default compiler instead of clang)
  is_debug = true           (enable debugging, true is the default)
  dcheck_always_on = true   (enable release asserts and debug layers)
  ```
  
  For a release build run `gn args out/Release` and set `is_debug = false`.
  
  On Windows, you can build for the Universal Windows Platform (UWP) by setting `target_os = "winuwp"` in the args.
  
  For more information on GN run `gn help`.
  
  Ninja can be used to compile on all platforms with one of the following commands:
  ```
  autoninja -C out/Debug
  autoninja -C out/Release
  ```
  Ninja automatically calls GN to regenerate the build files on any configuration change.
  
  Ensure `depot_tools` is in your path as it provides ninja.
  
  ### Building with Visual Studio
  
  To generate the Visual Studio solution in `out/Debug/angle-debug.sln`:
  ```
  gn gen out/Debug --sln=angle-debug --ide=vs2019
  ```
  
  In Visual Studio:
   1. Open the ANGLE solution file `out/Debug/angle-debug.sln`.
   2. It is recommended you still use `autoninja` from the command line to build.
   3. If you do want to build in the solution, "Build Solution" is not functional with GN. Build one target at a time.
  
  Once the build completes all ANGLE libraries, tests, and samples will be located in `out/Debug`.
  
  ### Building ANGLE for Android
  
  See the Android specific [documentation](DevSetupAndroid.md#ANGLE-for-Android).
  
  ## Application Development with ANGLE
  This sections describes how to use ANGLE to build an OpenGL ES application.
  
  ### Choosing a Backend
  ANGLE can use a variety of backing renderers based on platform.  On Windows, it defaults to D3D11 where it's available,
  or D3D9 otherwise.  On other desktop platforms, it defaults to GL.  On mobile, it defaults to GLES.
  
  ANGLE provides an EGL extension called `EGL_ANGLE_platform_angle` which allows uers to select which renderer to use at EGL initialization time by calling eglGetPlatformDisplayEXT with special enums. Details of the extension can be found in it's specification in `extensions/ANGLE_platform_angle.txt` and `extensions/ANGLE_platform_angle_*.txt` and examples of it's use can be seen in the ANGLE samples and tests, particularly `util/EGLWindow.cpp`.
  
  To change the default D3D backend:
  
   1. Open `src/libANGLE/renderer/d3d/DisplayD3D.cpp`
   2. Locate the definition of `ANGLE_DEFAULT_D3D11` near the head of the file, and set it to your preference.
  
  ### To Use ANGLE in Your Application
  On Windows:
  
   1. Configure your build environment to have access to the `include` folder to provide access to the standard Khronos EGL and GLES2 header files.
    * For Visual C++
       * Right-click your project in the _Solution Explorer_, and select _Properties_.
       * Under the _Configuration Properties_ branch, click _C/C++_.
       * Add the relative path to the Khronos EGL and GLES2 header files to _Additional Include Directories_.
   2. Configure your build environment to have access to `libEGL.lib` and `libGLESv2.lib` found in the build output directory (see [Building ANGLE](#building-with-visual-studio)).
     * For Visual C++
       * Right-click your project in the _Solution Explorer_, and select _Properties_.
       * Under the _Configuration Properties_ branch, open the _Linker_ branch and click _Input_.
       * Add the relative paths to both the `libEGL.lib` file and `libGLESv2.lib` file to _Additional Dependencies_, separated by a semicolon.
   3. Copy `libEGL.dll` and `libGLESv2.dll` from the build output directory (see [Building ANGLE](#building-with-visual-studio)) into your application folder.
   4. Code your application to the Khronos [OpenGL ES 2.0](http://www.khronos.org/registry/gles/) and [EGL 1.4](http://www.khronos.org/registry/egl/) APIs.
  
  On Linux and MacOS, either:
  
   - Link you application against `libGLESv2` and `libEGL`
   - Use `dlopen` to load the OpenGL ES and EGL entry points at runtime.
  
  ## GLSL ES to GLSL Translator
  In addition to OpenGL ES 2.0 and EGL 1.4 libraries, ANGLE also provides a GLSL ES to GLSL translator. This is useful for implementing OpenGL ES emulators on top of desktop OpenGL.
  
  ### Source and Building
  The translator code is included with ANGLE but fully independent; it resides in `src/compiler`.
  Follow the steps above for [getting and building ANGLE](#getting-the-source) to build the translator on the platform of your choice.
  
  ### Usage
  The basic usage is shown in `essl_to_glsl` sample under `samples/translator`. To translate a GLSL ES shader, following functions need to be called in the same order:
  
   * `ShInitialize()` initializes the translator library and must be called only once from each process using the translator.
   * `ShContructCompiler()` creates a translator object for vertex or fragment shader.
   * `ShCompile()` translates the given shader.
   * `ShDestruct()` destroys the given translator.
   * `ShFinalize()` shuts down the translator library and must be called only once from each process using the translator.
  

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