Panic: gsamplerCubeArrayShadow isn't supported

[Sergei Gureev]

Hi!

I was trying to run the array_texture shader example from bevy, and it crashes:

INFO bevy_winit::system: Creating new window "App" (0v0)
INFO bevy_render::renderer: AdapterInfo { name: "Mesa Intel(R) UHD Graphics (TGL GT1)", vendor: 32902, device: 0, device_type: IntegratedGpu, driver: "", driver_info: "", backend: Gl }
WARN bevy_pbr::ssao: ScreenSpaceAmbientOcclusionPlugin not loaded. GPU lacks support: TextureFormat::R16Float does not support TextureUsages::STORAGE_BINDING.
INFO bevy_diagnostic::system_information_diagnostics_plugin::internal: SystemInfo { os: "Linux rolling Arch Linux", kernel: "6.4.10-zen2-1-zen", cpu: "11th Gen Intel(R) Core(TM) i9-11950H @ 2.60GHz", core_count: "8", memory: "31.1 GiB" }
ERROR wgpu_hal::gles::egl: GLES: [API/Error] ID 1 : GL_INVALID_ENUM in glTexStorage2DMultisample(target=GL_TEXTURE_2D)    
ERROR wgpu_hal::gles::egl: GLES: [API/Error] ID 1 : GL_INVALID_ENUM in glTexStorage2DMultisample(target=GL_TEXTURE_2D)    
ERROR wgpu::backend::direct: Shader translation error for stage ShaderStages(FRAGMENT): gsamplerCubeArrayShadow isn't supported in textureGrad, textureLod or texture with bias    
ERROR wgpu::backend::direct: Please report it to https://github.com/gfx-rs/naga    
ERROR wgpu::backend::direct: Handling wgpu errors as fatal by default    
thread 'Compute Task Pool (0)' panicked at 'wgpu error: Validation Error

Caused by:
    In Device::create_render_pipeline
      note: label = `opaque_mesh_pipeline`
    Internal error in ShaderStages(FRAGMENT) shader: gsamplerCubeArrayShadow isn't supported in textureGrad, textureLod or texture with bias

I'm running this on Wayland. I have two GPUs, but I modified the example initialization code to explicitly use the integrated one since NVidia doesn't support Vulkan on Wayland yet:

DefaultPlugins
    .set(RenderPlugin {
        wgpu_settings: WgpuSettings {
            power_preference: PowerPreference::LowPower,
            ..default()
        },
    }),

The full log with backtrace: log.txt

Any ideas how to fix this? Is my system configuration incorrect?

[Fredrik Fornwall]

Seems like a duplicate of gfx-rs/wgpu#4455.

[Teodor Tanasoaia]

Thanks for the report, this does look like a dupe of gfx-rs/wgpu#4455 which unfortunately doesn't have a solution right now.

[Sergei Gureev]

The solution was to force Bevy to use the Vulkan backend by setting WGPU_BACKEND="Vulkan" environment variable. However, after doing so, Bevy (or WGPU? or Vulkan driver?) started to ignore the power_preference: PowerPreference::LowPower setting and ran on the NVidia's GPU.

This was fixed by setting the VK_ICD_FILENAMES=/usr/share/vulkan/icd.d/intel_icd.x86_64.json environment variable. Now it successfully runs on Wayland with the Vulkan backend on the Intel GPU.