kc3-lang/angle/doc/DevSetup.md

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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.

Required Tools

On all platforms:

On Windows:

On Linux:

On MacOS:

Getting the source

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

If you’re contributing code, you will also need to set up the commit-msg hook. See ContributingCode#getting-started-with-gerrit for more detailed instructions.

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. The default build options build ANGLE with clang and in release mode. Often, the default options are the desired ones, but they can be changed by running gn args out/Debug. Some options that are commonly overriden for development are:

is_component_build = false         (links dependencies into the build targets)
target_cpu = "x86"                 (default is "x64")
is_clang = false (NOT RECOMMENDED) (to use system default compiler instead of clang)
is_debug = false                   (for release builds. is_debug = true is the default)
angle_assert_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. Setting is_component_build = false is highly recommended to support moving libEGL.dll and libGLESv2.dll to an application’s directory and being self-contained, instead of depending on other DLLs (d3dcompiler_47.dll is still needed for the Direct3D backend).

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 Goma (Google employees only)

In addition, Google employees should use goma, a distributed compilation system. Detailed information is available internally but the relevant gn arg is:

use_goma = true

To get any benefit from goma it is important to pass a large -j value to ninja. A good default is 10numCores to 20numCores. If you run autoninja then it will automatically pass an appropriate -j value to ninja for goma or not.

$ autoninja -C out\Debug

Building and Debugging 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.

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 its specification in extensions/EGL_ANGLE_platform_angle.txt and extensions/EGL_ANGLE_platform_angle_*.txt and examples of its 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 remove any backend entirely:

  1. Run gn args <path/to/build/dir>
  2. Set the appropriate variable to false. Options are:

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.
  1. Configure your build environment to have access to libEGL.lib and libGLESv2.lib found in the build output directory (see Building ANGLE).
  1. Copy libEGL.dll and libGLESv2.dll from the build output directory (see Building ANGLE) into your application folder.
  2. Code your application to the Khronos OpenGL ES 2.0 and EGL 1.4 APIs.

On Linux and MacOS, either:

GLSL ES Translator

In addition to OpenGL ES and EGL libraries, ANGLE also provides a GLSL ES translator. The translator targets various back-ends, including HLSL, GLSL for desktop and mobile, SPIR-V and Metal SL. To build the translator, build the angle_shader_translator target. Run the translator binary without arguments to see a usage message.

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 to build the translator on the platform of your choice.

Usage

The ANGLE shader_translator sample demos basic C++ API usage. To translate a GLSL ES shader, call the following functions in the same order:

Source

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