Add "mingw-w64-x86_64-angleproject" to properly retrieve system EGL libs

[ohenley]

@onox, @charlie5

I tested this on Windows, and as it stands, the mingw-w64-x86_64-mesa package does not provide the necessary EGL libraries, so linking fails. To resolve this, I had to install the mingw-w64-x86_64-angleproject package, which includes libEGL and related libraries. Could you confirm if there was another intended way to provide these libraries?

@mosteo I manually added the following entry:

msys2 = ["mingw-w64-x86_64-mesa", "mingw-w64-x86_64-angleproject"]

to C:\Users\olivi\AppData\Local\alire\settings\indexes\community\repo\index\li\libegl\libegl-external.toml, but it didn’t trigger the installation of mingw-w64-x86_64-angleproject (running alr update had no effect). I had to install it manually using the MSYS2 console.

Because of this, I’m unsure if my proposed changes are the correct way to address the issue or if there’s a different intended process for triggering the installation locally.

Thank you,
Olivier

[mosteo]

msys2 = ["mingw-w64-x86_64-mesa", "mingw-w64-x86_64-angleproject"]

This won't work, as that is a list of possible candidates to look for in the system. If several report the same version, only the first one is kept as the provider.

In essence, if -mesa is not providing EGL, it was wrongly used. Only -angleproject should be listed. Could you please try that?

[ohenley]

Thank you for the feedback Mosteo.

Turns out EGL is probably not the answer for Windows anyway. (Because, IIUC, EGL as implemented by angle on Windows is backed by OpenGL ES only and not full fledge OpenGL)

I will close for now.