vcpkg/scripts/angle/maintainer-notes.md
pastdue 691244117b
[angle] Update to chromium/5414, improve build system (and future updates) (#27444)
* [angle] Update to chromium/5249

- Refactor build system based on WebKit's CMake build system for libANGLE
- Add maintainer-notes.md

* [angle] Fetch & generate more files in portfile

* [angle] Move maintainer-notes.md

* [angle] Port changes from #27701

* Merge install tweak from #28547

* [angle] Tweak PlatformLinux

* Run x-add-version

* [angle] Update to chromium/5414

* Run x-add-version

* Fix version database.

* Fix version database

---------

Co-authored-by: Billy Robert O'Neal III <bion@microsoft.com>
Co-authored-by: Jonliu1993 <13720414433@163.com>
2023-02-10 11:45:11 -08:00

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# The ANGLE vcpkg port
The ANGLE port's buildsystem is based off of [WebKit's approach](https://github.com/WebKit/WebKit/tree/main/Source/ThirdParty/ANGLE) to converting ANGLE's buildsystem to CMake.
Details:
- `cmake-buildsystem/CMakeLists.txt`
- This is an augmented version of WebKit's [CMakeLists.txt](https://github.com/WebKit/WebKit/blob/main/Source/ThirdParty/ANGLE/CMakeLists.txt), with vcpkg edits and additions.
- `cmake-buildsystem/*.cmake`
- These are configuration files based on [WebKit's approach](https://github.com/WebKit/WebKit/tree/main/Source/ThirdParty/ANGLE), but customized for vcpkg (and using `PlatformLinux` instead of `PlatformGTK`)
## Updating the ANGLE vcpkg port
1. Select a new ANGLE version
Recommendation: Follow the recommendations in the libANGLE "[Choosing an ANGLE branch](https://github.com/google/angle/blob/master/doc/ChoosingANGLEBranch.md#matching-a-chromium-release-to-an-angle-branch)" guide, and find the branch that matches the current Chromium Stable.
2. [Find the branch](https://github.com/google/angle/branches) (usually `chromium/<version>`) and latest commit on that branch, and update the following variables in `portfile.cmake`:
- `ANGLE_COMMIT`
- `ANGLE_VERSION`
- `ANGLE_SHA512`
3. Check the `DEPS` file at that ANGLE commit, for the commit used in `'third_party/zlib'`, and update `ANGLE_THIRDPARTY_ZLIB_COMMIT` in `portfile.cmake` if necessary.
4. Attempt to build. You may have to tweak the `CMakeLists.txt`, `Platform*.cmake` files, etc. Check with the latest files in [WebKit's repo](https://github.com/WebKit/WebKit/tree/main/Source/ThirdParty/ANGLE) to see if any updates need to be ported to the vcpkg's custom files. You might also need to change the `ANGLE_WEBKIT_BUILDSYSTEM_COMMIT` in the portfile (although this should theoretically need updating less frequently).
5. Check headers against `opengl-registry` - make sure headers are similar.
> angle defines some additional entrypoints.
> opengl-registry should be latest before updating angle
6. Complete all the other normal steps in the [Maintainer Guide](/docs/maintainers/maintainer-guide.md)