Function try_create_device

native/shared/src/renderer/transient.rs:282–301

Headless wgpu device for tests. Uses the default noop/fallback backend if available so tests run in CI without a GPU. Returns None on environments where no adapter is available — tests that need a device are skipped gracefully.

()

    /// None on environments where no adapter is available — tests that
    /// need a device are skipped gracefully.
    fn try_create_device() -> Option<(wgpu::Device, wgpu::Queue)> {
        let instance = wgpu::Instance::new(wgpu::InstanceDescriptor {
            backends: wgpu::Backends::all(),
            ..wgpu::InstanceDescriptor::new_without_display_handle()
        });
        let adapter = pollster::block_on(instance.request_adapter(&wgpu::RequestAdapterOptions {
            power_preference: wgpu::PowerPreference::LowPower,
            compatible_surface: None,
            force_fallback_adapter: true,
        })).ok()?;
        let (device, queue) = pollster::block_on(adapter.request_device(
            &wgpu::DeviceDescriptor {
                label: Some("transient-test-device"),
                required_features: wgpu::Features::empty(),
                required_limits: wgpu::Limits::downlevel_defaults(),
                ..Default::default()
            },
        )).ok()?;
        Some((device, queue))
    }

    #[test]
    fn size_policy_resolves() {