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Wez Furlong 4d71a7913a macOS: bundle and use MetalANGLE to enable Metal rendering 
This commit adjusts the window layer to have it try to load EGL
implementations on macOS.  This is important as the system
provided OpenGL implementation is deprecated and I wanted to
have a path forward for when it is finally removed.

If EGL fails to initialize, we fall back to the CGL/OpenGL
implementation that we used previously.

I've included binaries built for 64-bit intel from the MetalANGLE
project; here's how I built them:

```
git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git --depth 1
git clone https://github.com/kakashidinho/metalangle --depth 1
cd metalangle
PATH=$PWD/../depot_tools:$PATH python scripts/bootstrap.py
PATH=$PWD/../depot_tools:$PATH gclient sync
PATH=$PWD/../depot_tools:$PATH gn --args="is_debug=false angle_enable_metal=true angle_enable_vulkan=false angle_enable_gl=false angle_build_all=false" gen out/Release
PATH=$PWD/../depot_tools:$PATH autoninja -C out/Release
```

Those steps are a little too long to want to put them directly
into the wezterm CI.

It is important for metalangle to be >= 8230df39a5
in order for scaling to be handled correctly when dragging windows
between monitors.

refs: https://github.com/kakashidinho/metalangle/issues/34
2020-10-17 09:34:01 -07:00

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WezTerm bundles some components provided by third parties. Their respective licenses are included in this directory.