EGL support on MacOS?

[Georges Martin]

I’m no expert on OpenGL either, but Alyssa Rosenzweig (@alyssarzg on Twitter) certainly is. She’s working on OpenGL and Mesa, on macOS and Asahi Linux.

G.

> Le 23 août 2022 à 17:33, Ken Cunningham <ken.cunningham.webuse at gmail.com> a écrit :
> 
> 
> I am not an expert on OpenGL support on any system, just trying to get things built, and looking for someone who might know more about it for ideas...
> 
> The linux world seems to be moving towards EGL based on a number of recent changes I have seen in webkit2-gtk, gtk4, and other places, that I think at least in part are due to improvements in EGL support, performance, and moving to Wayland.
> 
> Newer software, for example the x11 version of gtk4, seems to assume EGL is present. Although it might be possible to #ifdef into the source to make this not happen on Apple, and use what I believe is the fallback of GLX, that is getting to be work and may not be much tested upstream.
> 
> An EGL implementation for Apple would be a more easily supportable fix, it would seem.
> 
> There is one in mesa, currently disabled in our port, that I was able to get to build with a small patch and a toggle in the Portfile. That allowed libepoxy to build with EGL support as well (with a toggle and two small patches). But performance seemed poor, and there were lots of warning messages and errors running software built with that. Looks quite raw.
> 
> Many projects (webkit, etc) seem to be moving to ANGLE for this support. This is actively maintained and as far as I can see, looks to be the future for a GL compatibility layer. Some ports (webkit2-gtk at least) bundle ANGLE and it builds on MacOS. There is no MacPorts port for ANGLE as yet, at least that I can see.
> 
> You can see the ANGLE build in webkit2-gtk like this:
> 
> nm /opt/local/lib/libwebkit2gtk-4.0.37.44.4.dylib | grep ANGLE
> 
> So - that is where my current knowledge ends. I am imagining that we will need an EGL implementation, possibly via ANGLE (or mesa, if it is performant), to allow (reasonably easy) ongoing support of x11 software builds.
> 
> If anyone has a nice depth of knowledge in this area and can shed more light on it / knows a better plan / knows of a current EGL solution I have missed so far, please add what you wish.
> 
> Ken