Panic when get_error() returns None

[danyspin97]

The unwrap here cause panic. get_error() can return None in some specific edge cases.

[timothee-haudebourg]

Thanks. Do you know the specific edge cases? Could you make a PR to solve this?

[acarl005]

I am able to trigger this case running the wgpu examples on the trunk branch and telling EGL to use my Nvidia card.

Crashing here

RUST_BACKTRACE=1 __EGL_VENDOR_LIBRARY_FILENAMES=/usr/share/glvnd/egl_vendor.d/10_nvidia.json cargo run --bin wgpu-examples -- mipmap

    Finished dev [unoptimized + debuginfo] target(s) in 0.10s
     Running `target/debug/wgpu-examples mipmap`
[2024-04-10T13:42:38Z WARN  sctk_adwaita::buttons] Ignoring unknown button type: icon
[2024-04-10T13:42:38Z INFO  wgpu_examples::framework] Initializing wgpu...
thread 'main' panicked at /home/andy/.cargo/registry/src/index.crates.io-6f17d22bba15001f/khronos-egl-6.0.0/src/lib.rs:1779:38:
called `Option::unwrap()` on a `None` value
stack backtrace:
   0: rust_begin_unwind
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library/std/src/panicking.rs:645:5
   1: core::panicking::panic_fmt
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library/core/src/panicking.rs:72:14
   2: core::panicking::panic
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library/core/src/panicking.rs:144:5
   3: core::option::Option<T>::unwrap
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library/core/src/option.rs:931:21
   4: khronos_egl::egl1_5::<impl khronos_egl::Instance<T>>::get_platform_display
             at /home/andy/.cargo/registry/src/index.crates.io-6f17d22bba15001f/khronos-egl-6.0.0/src/lib.rs:1779:9
   5: <wgpu_hal::gles::egl::Instance as wgpu_hal::Instance>::init
             at ./wgpu-hal/src/gles/egl.rs:791:21
   6: wgpu_core::instance::Instance::new::init
             at ./wgpu-core/src/instance.rs:81:32
   7: wgpu_core::instance::Instance::new
             at ./wgpu-core/src/instance.rs:110:17
   8: wgpu_core::global::Global::new
             at ./wgpu-core/src/global.rs:56:23
   9: <wgpu::backend::wgpu_core::ContextWgpuCore as wgpu::context::Context>::init
             at ./wgpu/src/backend/wgpu_core.rs:544:14
  10: wgpu::Instance::new
             at ./wgpu/src/lib.rs:1808:36
  11: wgpu_examples::framework::ExampleContext::init_async::{{closure}}
             at ./examples/src/framework.rs:274:24
  12: wgpu_examples::framework::start::{{closure}}
             at ./examples/src/framework.rs:372:93
  13: pollster::block_on
             at /home/andy/.cargo/registry/src/index.crates.io-6f17d22bba15001f/pollster-0.3.0/src/lib.rs:128:15
  14: wgpu_examples::framework::run
             at ./examples/src/framework.rs:482:13
  15: wgpu_examples::mipmap::main
             at ./examples/src/mipmap/mod.rs:504:5
  16: wgpu_examples::main
             at ./examples/src/main.rs:229:5
  17: core::ops::function::FnOnce::call_once
             at /rustc/07dca489ac2d933c78d3c5158e3f43beefeb02ce/library/core/src/ops/function.rs:250:5
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.

uname -a

Linux queenie 6.5.0-21-generic #21~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Fri Feb  9 13:32:52 UTC 2 x86_64 x86_64 x86_64 GNU/Linux

nvidia-smi

+-----------------------------------------------------------------------------------------+
| NVIDIA-SMI 550.67                 Driver Version: 550.67         CUDA Version: 12.4     |
|-----------------------------------------+------------------------+----------------------+
| GPU  Name                 Persistence-M | Bus-Id          Disp.A | Volatile Uncorr. ECC |
| Fan  Temp   Perf          Pwr:Usage/Cap |           Memory-Usage | GPU-Util  Compute M. |
|                                         |                        |               MIG M. |
|=========================================+========================+======================|
|   0  NVIDIA GeForce RTX 3050 ...    Off |   00000000:01:00.0 Off |                  N/A |
| N/A   39C    P8              5W /   25W |      74MiB /   4096MiB |     22%      Default |
|                                         |                        |                  N/A |
+-----------------------------------------+------------------------+----------------------+

+-----------------------------------------------------------------------------------------+
| Processes:                                                                              |
|  GPU   GI   CI        PID   Type   Process name                              GPU Memory |
|        ID   ID                                                               Usage      |
|=========================================================================================|
|    0   N/A  N/A      2032      G   /usr/bin/gnome-shell                            1MiB |
|    0   N/A  N/A      6630    C+G   warp-terminal-dev                              64MiB |
+-----------------------------------------------------------------------------------------+

I'm using Wayland.

[danyspin97]

Thanks. Do you know the specific edge cases? Could you make a PR to solve this?

Unfortunately, I don't remember what caused this issue, I am sure it was something wrong with my code because I was just learning openGL and integrating EGL in my wayland application.