Check wgpu Vulkan limits on Raspberry Pi 4

Cargo.toml

[package]
name = "check-adapter-limit"
version = "0.1.0"
edition = "2021"

[dependencies]
wgpu = { git = "https://github.com/gfx-rs/wgpu", rev = "0ac9ce002656565ccd05b889f5856f4e2c38fa73" }
async-std = { version = "1.10.0", features = ["attributes"] }

[[bin]]
name = "check"
path = "main.rs"

main.rs

fn check_limits(target: &wgpu::Limits, base: &wgpu::Limits, label: &str) {
  let mut count = 0;
  println!("{}", label);
  target.check_limits_with_fail_fn(base, false, |name, requested, allowed| {
    println!(" {}: {} should be {}", name, requested, allowed);
    count += 1;
  });
  println!("number of failures: {}\n", count);
}

#[async_std::main]
async fn main() {
  let backend = wgpu::Backends::VULKAN;
  let instance = wgpu::Instance::new(backend);

  let adapter = wgpu::util::initialize_adapter_from_env_or_default(&instance, backend, None)
    .await
    .expect("No suitable GPU adapters found on the system!");

  let limits = wgpu::Limits::default();
  check_limits(&limits, &adapter.limits(), "wgpu::Limits::default()");

  let limits = wgpu::Limits::downlevel_defaults();
  check_limits(
    &limits,
    &adapter.limits(),
    "wgpu::Limits::downlevel_defaults()",
  );
}

output.log

pi@raspberrypi:~/Desktop/check $ cargo run
   Compiling check-adapter-limit v0.1.0 (/home/pi/Desktop/check)
    Finished dev [unoptimized + debuginfo] target(s) in 15.76s
     Running `target/debug/check`
WARNING: v3dv is neither a complete nor a conformant Vulkan implementation. Testing use only.
wgpu::Limits::default()
 max_texture_dimension_1d: 8192 should be 4096
 max_texture_dimension_2d: 8192 should be 4096
 max_storage_textures_per_shader_stage: 8 should be 4
number of failures: 3

wgpu::Limits::downlevel_defaults()
number of failures: 0

pi@raspberrypi:~/Desktop/check $