GraphicsInitializationError on Raspberry Pi 4

[fenhl]

Describe the bug
Attempting to run the devel branch's 01_super_simple example on a Raspberry Pi 4 fails with the error message:

$ cargo run --example=01_super_simple
    Finished dev [unoptimized + debuginfo] target(s) in 1.23s
     Running `target/debug/examples/01_super_simple`
Failed to initialize graphics, trying secondary backends.. Please mention this if you encounter any bugs!
Error: GraphicsInitializationError

To Reproduce

1. Install a fresh Raspberry Pi OS (64-bit) on a Raspberry Pi 4
2. Install Rust and the ggez prerequisites
3. git clone https://github.com/ggez/ggez.git --branch=devel
4. cargo run --example=01_super_simple

Expected behavior
A window showing a circle appears.

Hardware and Software:

• ggez version: current git devel branch (160413d)
• OS: Raspberry Pi OS (64-bit) based on Debian GNU/Linux 11 (bullseye)
• Graphics card: Broadcom BCM2711, Quad core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
• Graphics card drivers: unknown (lspci | grep VGA returns no output)

[PSteinhaus]

Thanks for sharing.

This is a bit annoying. I hoped (and believed) that at least the raspberry pi 4 would be safe, but it seems wgpu still struggles to run on it.

In theory, the Raspberry 4 should use V3D, which supports Vulkan on Raspberry 4, which should enable wgpu to run, but something seems to go wrong there.

[Lokathor]

What's wrong is that the Vulkan driver is not in the distros yet.

On RPI4 you have to assume that GLES 3.1 is the best available, for now.

[PSteinhaus]

Thanks for the info! :D
Then there’s hope that this will solve itself at least on Pi4 with time ^^