message: Add a primary backend that can be set
  Add a primary backend that can be set
diff: @@ -78,6 +78,7 @@ fn backend_from_env() -> Option<wgpu::BackendBit> {
  "dx11" => wgpu::BackendBit::DX11,
  "gl" => wgpu::BackendBit::GL,
  "webgpu" => wgpu::BackendBit::BROWSER_WEBGPU,
  + "primary" => wgpu::BackendBit::PRIMARY,
  other => panic!("Unknown backend: {}", other),
  }
  })
  