Support for Raspberry Pi (and other linux_arm64)

[almarklein]

• User's system:
  • Don't forget to run sudo apt install vulkan-tools mesa-vulkan-drivers.
• Here wgpu-py
  • cffi must provide binary wheels for linux_arm64.
  • Detect raspberry pi so that the download script can download the correct libs.
  • Make our get_surface_id_from_canvas works (with a bit of luck it does).
  • Build the appropriate wheels on CI.
• wgpu-native
  • Build the binary on CI: issue 142 -> pr 148. Remaining issue is that the glibc version does not match.
• wgpu-core
  • Should, work, but there are some issues.
  • Tracking Issue for Wgpu on Raspberry Pi 4 gfx-rs/wgpu#1069

[Korijn]

I guess these would correspond to the python wheel aarch64 platform tag? Cibuildwheel supports building them so it seems trivial indeed. I have a pi now so I can test.

[almarklein]

While we're doing this, maybe we can generalize this to the full matrix that cibuildwheel supports. Probably not much extra work at each step. We can't test all platforms, but having them available makes it easier for others to test it.

[Korijn]

While we're doing this, maybe we can generalize this to the full matrix that cibuildwheel supports. Probably not much extra work at each step. We can't test all platforms, but having them available makes it easier for others to test it.

Well, sure! I can't really assess how hard it would be to accomplish that at over wgpu-native :)

Here's what we are missing:

Linux: aarch64 ppc64le s390x
macOS: universal2

[Korijn]

Also... cffi needs to support these platforms as well.

Edit: which, they do, except for macos universal2.

[Korijn]

Looking at wgpu-native and manylinux, maybe it's not so hard to create arm builds? There are docker images for:

• manylinux2014_aarch64
• manylinux2014_armv7l

[almarklein]

What's currently holding this back is that in gfx-rs/wgpu-native#148 the glibc version is too new for the pi.

[Korijn]

Current status: still held back by wgpu-native build issues (linked above). Might be fixed by targeting the newer pi.

[almarklein]

gfx-rs/wgpu-native#326

[almarklein]

Only to build the right wheels in CD!