I built a new GTK 4 backend specifically for macOS so we have native support for rendering all of the UI with OpenGL like we do on Linux and Windows. I'm fairly quick to fix bugs if I get good reports, and it can be installed with `brew install gtk4`.
You can also build GTK for macOS easily with meson as it has subprojects for everything. In fact, our CI does it from scratch on every commit w/ macOS. On Windows you can just open GTK with visual studio and build it by using Meson to generate the project files.
A bunch of work is about to land to make the macOS backend more solid/faster too similar to the work Firefox did in the last couple of years to reduce power usage w/ OpenGL/IOSurface/etc.
You can also build GTK for macOS easily with meson as it has subprojects for everything. In fact, our CI does it from scratch on every commit w/ macOS. On Windows you can just open GTK with visual studio and build it by using Meson to generate the project files.
A bunch of work is about to land to make the macOS backend more solid/faster too similar to the work Firefox did in the last couple of years to reduce power usage w/ OpenGL/IOSurface/etc.