Name: ANGLE
URL: https://code.google.com/p/angleproject/
Version: 2422
License: BSD
License File: LICENSE

Description:
ANGLE is a conformant implementation of the OpenGL ES 2.0
specification that is hardware‐accelerated via Direct3D.

# ANGLE - Almost Native Graphics Layer Engine

The goal of ANGLE is to allow users of multiple operating systems to seamlessly run WebGL and other
OpenGL ES content by translating OpenGL ES API calls to one of the hardware-supported APIs available
for that platform. ANGLE currently provides translation from OpenGL ES 2.0 and 3.0 to desktop
OpenGL, OpenGL ES, Direct3D 9, and Direct3D 11. Support for translation from OpenGL ES to Vulkan is
underway, and future plans include compute shader support (ES 3.1) and MacOS support.

### Level of OpenGL ES support via backing renderers

|                |  Direct3D 9   |  Direct3D 11     |   Desktop GL   |    GL ES      |    Vulkan     |
|----------------|:-------------:|:----------------:|:--------------:|:-------------:|:-------------:|
| OpenGL ES 2.0  |    complete   |    complete      |    complete    |   complete    |  in progress  |
| OpenGL ES 3.0  |               |    complete      |    complete    |  in progress  |  not started  |
| OpenGL ES 3.1  |               |   not started    |   in progress  |  in progress  |  not started  |

### Platform support via backing renderers

|             |    Direct3D 9  |   Direct3D 11  |   Desktop GL  |    GL ES    |   Vulkan    |
|------------:|:--------------:|:--------------:|:-------------:|:-----------:|:-----------:|
| Windows     |    complete    |    complete    |   complete    |   complete  | in progress |
| Linux       |                |                |   complete    |             |   planned   |
| Mac OS X    |                |                |   in progress |             |             |
| Chrome OS   |                |                |               |   complete  |   planned   |
| Android     |                |                |               |   complete  |   planned   |

ANGLE v1.0.772 was certified compliant by passing the ES 2.0.3 conformance tests in October 2011.
ANGLE also provides an implementation of the EGL 1.4 specification.

ANGLE is used as the default WebGL backend for both Google Chrome and Mozilla Firefox on Windows
platforms. Chrome uses ANGLE for all graphics rendering on Windows, including the accelerated
Canvas2D implementation and the Native Client sandbox environment.

Portions of the ANGLE shader compiler are used as a shader validator and translator by WebGL
implementations across multiple platforms. It is used on Mac OS X, Linux, and in mobile variants of
the browsers. Having one shader validator helps to ensure that a consistent set of GLSL ES shaders
are accepted across browsers and platforms. The shader translator can be used to translate shaders
to other shading languages, and to optionally apply shader modifications to work around bugs or
quirks in the native graphics drivers. The translator targets Desktop GLSL, Direct3D HLSL, and even
ESSL for native GLES2 platforms.

## Sources

ANGLE repository is hosted by Chromium project and can be
[browsed online](https://chromium.googlesource.com/angle/angle) or cloned with

    git clone https://chromium.googlesource.com/angle/angle


## Building

View the [Dev setup instructions](doc/DevSetup.md). For generating a Windows Store version of ANGLE view the [Windows Store instructions](doc/BuildingAngleForWindowsStore.md)

## Contributing

* Join our [Google group](https://groups.google.com/group/angleproject) to keep up to date.
* Join us on IRC in the #ANGLEproject channel on FreeNode.
* File bugs in the [issue tracker](http://code.google.com/p/angleproject/issues/list) (preferably with an isolated test-case).
* [Choose an ANGLE branch](doc/ChoosingANGLEBranch.md) to track in your own project.


* Read ANGLE development [documentation](doc).
* Look at [pending](https://chromium-review.googlesource.com/#/q/project:angle/angle+status:open)
  and [merged](https://chromium-review.googlesource.com/#/q/project:angle/angle+status:merged) changes.
* Become a [code contributor](doc/ContributingCode.md).
* Use ANGLE's [coding standard](doc/CodingStandard.md).
* Learn how to [build ANGLE for Chromium development](doc/BuildingAngleForChromiumDevelopment.md).
* Get help on [debugging ANGLE](doc/DebuggingTips.md).


* Read about WebGL on the [Khronos WebGL Wiki](http://khronos.org/webgl/wiki/Main_Page).
* Learn about implementation details in the [OpenGL Insights chapter on ANGLE](http://www.seas.upenn.edu/~pcozzi/OpenGLInsights/OpenGLInsights-ANGLE.pdf) and this [ANGLE presentation](https://drive.google.com/file/d/0Bw29oYeC09QbbHoxNE5EUFh0RGs/view?usp=sharing).
* Learn about the past, present, and future of the ANGLE implementation in [this recent presentation](https://docs.google.com/presentation/d/1CucIsdGVDmdTWRUbg68IxLE5jXwCb2y1E9YVhQo0thg/pub?start=false&loop=false).
* If you use ANGLE in your own project, we'd love to hear about it!

This is the ANGLE project, originally from https://chromium.googlesource.com/angle/angle

The Mozilla upstream is the 'mozilla' branch from https://github.com/mozilla/angle, which
includes Mozilla-specific patches on top of upstream.

=== How to upgrade ANGLE ===

1. git clone https://github.com/mozilla/angle angle

2. Go into the angle dir, and add the google upstream as a remote:
     git remote add google https://chromium.googlesource.com/angle/angle

3. Fetch the new google upstream:
     git fetch google

4. Switch to the mozilla branch
     git checkout mozilla

5. Rebase the mozilla branch on top of the new google master.  Fix up patches along the way,
   remove unneded commits.  Google seems to have "chromium/2059" branches as well, that I
   assume are merges into the Chromium tree.  These might be a good point to rebase on
   as well, instead of google/master:
     git rebase -i google/master
  or git rebase -i google/chromium/2081  (whatever the latest is in 'git branch -a')

6. Re-generate moz.build files:
     ./gyp_mozbuild

7. nuke mozilla-central/gfx/angle directory

8. copy all the relevant files from the github checkout
     cd mozilla-central
     mkdir gfx/angle
     cp -r /c/proj/angle/[A-Z]* /c/proj/angle/{include,src,moz.build} gfx/angle

9.  Build. Fix things until it builds.

10. Try runs and reviews!

11. Once reviews are done and checkin is ready, tag the equivalent git repo:
    git tag -a mozilla-bug-123456 -m "ANGLE update for bug 123456"

12. Push the new mozilla branch, along with the tags upstream:
    git push --tags mozilla +mozilla

The "mozilla" branch head will keep moving, since it will keep getting rebased.
The tags will point to the topmost commit that was used for a particular bug number,
so that we can see its history if needed.