Fix wgpu warnings

[hannobraun]

Since I re-enabled logging recently, I've been noticing warnings being logged by wgpu. Here's the output from a typical run:

2022-02-09T13:27:48.037289Z  WARN wgpu_hal::vulkan::instance: Unable to find layer: VK_LAYER_KHRONOS_validation    
2022-02-09T13:27:48.039542Z  INFO wgpu_hal::vulkan::instance: Instance version: 0x4020cb    
2022-02-09T13:27:48.039672Z  INFO wgpu_hal::vulkan::instance: Enabling debug utils    
2022-02-09T13:27:48.039793Z  INFO wgpu_hal::vulkan::instance: Enabling device properties2    
MESA-INTEL: warning: Haswell Vulkan support is incomplete
2022-02-09T13:27:48.045609Z  INFO wgpu_core::instance: Adapter Vulkan AdapterInfo { name: "Intel(R) HD Graphics 4600 (HSW GT2)", vendor: 32902, device: 1042, device_type: IntegratedGpu, backend: Vulkan }    
2022-02-09T13:27:48.076110Z  INFO wgpu_hal::vulkan::adapter: Private capabilities: PrivateCapabilities { flip_y_requires_shift: true, imageless_framebuffers: true, image_view_usage: true, timeline_semaphores: true, texture_d24: true, texture_d24_s8: true, can_present: true, non_coherent_map_mask: 63, robust_buffer_access: true, robust_image_access: true }    
2022-02-09T13:27:48.079807Z  INFO wgpu_core::device: configuring surface with SurfaceConfiguration { usage: RENDER_ATTACHMENT, format: Bgra8UnormSrgb, width: 800, height: 600, present_mode: Fifo }    
2022-02-09T13:27:48.082956Z  INFO wgpu_core::device: Created texture Valid((0, 1, Vulkan)) with TextureDescriptor { label: None, size: Extent3d { width: 800, height: 600, depth_or_array_layers: 1 }, mip_level_count: 1, sample_count: 1, dimension: D2, format: Depth32Float, usage: RENDER_ATTACHMENT }    
2022-02-09T13:27:48.090101Z  INFO wgpu_core::device: Created buffer Valid((0, 1, Vulkan)) with BufferDescriptor { label: None, size: 128, usage: COPY_DST | UNIFORM, mapped_at_creation: true }    
2022-02-09T13:27:48.094594Z  INFO wgpu_core::device: Created buffer Valid((1, 1, Vulkan)) with BufferDescriptor { label: None, size: 0, usage: VERTEX, mapped_at_creation: false }    
2022-02-09T13:27:48.094776Z  INFO wgpu_core::device: Created buffer Valid((2, 1, Vulkan)) with BufferDescriptor { label: None, size: 0, usage: INDEX, mapped_at_creation: false }    
2022-02-09T13:27:48.094888Z  INFO wgpu_core::device: Created buffer Valid((3, 1, Vulkan)) with BufferDescriptor { label: None, size: 0, usage: VERTEX, mapped_at_creation: false }    
2022-02-09T13:27:48.095030Z  INFO wgpu_core::device: Created buffer Valid((4, 1, Vulkan)) with BufferDescriptor { label: None, size: 0, usage: INDEX, mapped_at_creation: false }    
2022-02-09T13:27:48.107642Z  INFO wgpu_core::device: Created buffer Valid((5, 1, Vulkan)) with BufferDescriptor { label: None, size: 64, usage: COPY_DST | UNIFORM, mapped_at_creation: true }    
2022-02-09T13:27:48.108572Z  INFO wgpu_core::device: Created texture Valid((1, 1, Vulkan)) with TextureDescriptor { label: Some("wgpu_glyph::Cache"), size: Extent3d { width: 256, height: 256, depth_or_array_layers: 1 }, mip_level_count: 1, sample_count: 1, dimension: D2, format: R8Unorm, usage: COPY_DST | TEXTURE_BINDING }    
2022-02-09T13:27:48.108923Z  INFO wgpu_core::device: Created buffer Valid((6, 1, Vulkan)) with BufferDescriptor { label: Some("wgpu_glyph::Cache upload buffer"), size: 25600, usage: COPY_SRC | COPY_DST, mapped_at_creation: false }    
2022-02-09T13:27:48.110579Z  INFO wgpu_core::device: Created buffer Valid((7, 1, Vulkan)) with BufferDescriptor { label: Some("wgpu_glyph::Pipeline instances"), size: 2600000, usage: COPY_DST | VERTEX, mapped_at_creation: false }    
2022-02-09T13:27:48.144042Z  INFO wgpu_core::device: Created buffer Valid((8, 1, Vulkan)) with BufferDescriptor { label: None, size: 29040, usage: VERTEX, mapped_at_creation: true }    
2022-02-09T13:27:48.144858Z  INFO wgpu_core::device: Created buffer Valid((9, 1, Vulkan)) with BufferDescriptor { label: None, size: 5808, usage: INDEX, mapped_at_creation: true }    
2022-02-09T13:27:48.145553Z  INFO wgpu_core::device: Created buffer Valid((10, 1, Vulkan)) with BufferDescriptor { label: None, size: 198080, usage: VERTEX, mapped_at_creation: true }    
2022-02-09T13:27:48.146281Z  INFO wgpu_core::device: Created buffer Valid((11, 1, Vulkan)) with BufferDescriptor { label: None, size: 19808, usage: INDEX, mapped_at_creation: true }    
2022-02-09T13:27:48.146662Z  INFO wgpu_core::device: Buffer (1, 1, Vulkan) is dropped    
2022-02-09T13:27:48.146819Z  INFO wgpu_core::device: Buffer (2, 1, Vulkan) is dropped    
2022-02-09T13:27:48.146936Z  INFO wgpu_core::device: Buffer (3, 1, Vulkan) is dropped    
2022-02-09T13:27:48.147039Z  INFO wgpu_core::device: Buffer (4, 1, Vulkan) is dropped    
2022-02-09T13:27:48.154246Z  INFO wgpu_core::device: configuring surface with SurfaceConfiguration { usage: RENDER_ATTACHMENT, format: Bgra8UnormSrgb, width: 1912, height: 1016, present_mode: Fifo }    
2022-02-09T13:27:48.169484Z  INFO wgpu_core::device: Created texture Valid((2, 1, Vulkan)) with TextureDescriptor { label: None, size: Extent3d { width: 1912, height: 1016, depth_or_array_layers: 1 }, mip_level_count: 1, sample_count: 1, dimension: D2, format: Depth32Float, usage: RENDER_ATTACHMENT }    
2022-02-09T13:27:48.200567Z  INFO wgpu_core::device: Created buffer Valid((12, 1, Vulkan)) with BufferDescriptor { label: Some("wgpu_glyph::Cache upload buffer"), size: 59136, usage: COPY_SRC | COPY_DST, mapped_at_creation: false }    
2022-02-09T13:27:48.200733Z  INFO wgpu_core::device: Buffer (6, 1, Vulkan) is dropped    
2022-02-09T13:27:48.204066Z  INFO wgpu_core::device: Created buffer Valid((13, 1, Vulkan)) with BufferDescriptor { label: Some("staging"), size: 59136, usage: MAP_WRITE | COPY_SRC, mapped_at_creation: true }    
2022-02-09T13:27:48.205754Z  INFO wgpu_core::device: Created buffer Valid((14, 1, Vulkan)) with BufferDescriptor { label: Some("staging"), size: 5876, usage: MAP_WRITE | COPY_SRC, mapped_at_creation: true }    
2022-02-09T13:27:48.208605Z  INFO wgpu_core::device: Created buffer Valid((15, 1, Vulkan)) with BufferDescriptor { label: Some("staging"), size: 1024, usage: MAP_WRITE | COPY_SRC, mapped_at_creation: true }    
2022-02-09T13:27:48.210105Z  INFO wgpu_core::device: Buffer (13, 1, Vulkan) is dropped    
2022-02-09T13:27:48.210209Z  INFO wgpu_core::device: Buffer (14, 1, Vulkan) is dropped    
2022-02-09T13:27:48.210280Z  INFO wgpu_core::device: Buffer (15, 1, Vulkan) is dropped    
2022-02-09T13:27:48.210514Z  WARN wgpu_core::device::queue: Dropped buffer has a pending mapping.    
2022-02-09T13:27:48.210572Z  WARN wgpu_core::device::queue: Dropped buffer has a pending mapping.    
2022-02-09T13:27:48.210619Z  WARN wgpu_core::device::queue: Dropped buffer has a pending mapping.    
2022-02-09T13:27:48.307232Z  INFO wgpu_core::device: configuring surface with SurfaceConfiguration { usage: RENDER_ATTACHMENT, format: Bgra8UnormSrgb, width: 3824, height: 2032, present_mode: Fifo }    
2022-02-09T13:27:48.339327Z  INFO wgpu_core::device: Created texture Valid((3, 3, Vulkan)) with TextureDescriptor { label: None, size: Extent3d { width: 3824, height: 2032, depth_or_array_layers: 1 }, mip_level_count: 1, sample_count: 1, dimension: D2, format: Depth32Float, usage: RENDER_ATTACHMENT }    
2022-02-09T13:27:48.345226Z  INFO wgpu_core::device: Created buffer Valid((15, 2, Vulkan)) with BufferDescriptor { label: Some("staging"), size: 1024, usage: MAP_WRITE | COPY_SRC, mapped_at_creation: true }    
2022-02-09T13:27:48.348008Z  INFO wgpu_core::device: Buffer (15, 2, Vulkan) is dropped    
2022-02-09T13:27:48.348669Z  WARN wgpu_core::device::queue: Dropped buffer has a pending mapping.    
2022-02-09T13:27:51.493964Z  INFO wgpu_core::device: Buffer (0, 1, Vulkan) is dropped    
2022-02-09T13:27:51.494043Z  INFO wgpu_core::device: Buffer (8, 1, Vulkan) is dropped    
2022-02-09T13:27:51.494093Z  INFO wgpu_core::device: Buffer (9, 1, Vulkan) is dropped    
2022-02-09T13:27:51.494138Z  INFO wgpu_core::device: Buffer (10, 1, Vulkan) is dropped    
2022-02-09T13:27:51.494177Z  INFO wgpu_core::device: Buffer (11, 1, Vulkan) is dropped    
2022-02-09T13:27:51.494256Z  INFO wgpu_core::device: Buffer (5, 1, Vulkan) is dropped    
2022-02-09T13:27:51.494331Z  INFO wgpu_core::device: Buffer (12, 1, Vulkan) is dropped    
2022-02-09T13:27:51.494401Z  INFO wgpu_core::device: Buffer (7, 1, Vulkan) is dropped    
2022-02-09T13:27:51.494443Z  INFO wgpu_core::hub: Dropping Global    
2022-02-09T13:27:51.524497Z  INFO wgpu_core::device: Destroying 3 command encoders    

I don't know if this is causing any problems, but it's certainly worth looking into, to make sure.

[hannobraun]

Output is a bit cleaner these days. Here are what these warnings currently looks:

  2022-03-16T15:13:22.837081Z  WARN wgpu_hal::vulkan::instance: Unable to find layer: VK_LAYER_KHRONOS_validation
    at /home/hanno/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-hal-0.12.4/src/vulkan/instance.rs:512

MESA-INTEL: warning: Haswell Vulkan support is incomplete
  2022-03-16T15:13:22.905659Z  WARN wgpu_core::device::queue: Dropped buffer has a pending mapping.
    at /home/hanno/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-core-0.12.2/src/device/queue.rs:660

  2022-03-16T15:13:22.905828Z  WARN wgpu_core::device::queue: Dropped buffer has a pending mapping.
    at /home/hanno/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-core-0.12.2/src/device/queue.rs:660

  2022-03-16T15:13:22.905896Z  WARN wgpu_core::device::queue: Dropped buffer has a pending mapping.
    at /home/hanno/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-core-0.12.2/src/device/queue.rs:660

  2022-03-16T15:13:22.974503Z  WARN wgpu_core::device::queue: Dropped buffer has a pending mapping.
    at /home/hanno/.cargo/registry/src/github.com-1ecc6299db9ec823/wgpu-core-0.12.2/src/device/queue.rs:660

I've looked into this, but I couldn't really figure out why these warnings exist, whether this is something we're doing wrong, or whether it's a problem within wgpu. I have basically no experience with wgpu internals, so it's hard for me to figure out what could be wrong. Since these warnings don't seem to be causing any problems, I've decided to leave it for now.

Labeling as https://github.com/hannobraun/Fornjot/labels/help%20wanted, as any assistance by more knowledgeable folks (or those willing to educate themselves and/or bug people in the wgpu channel) would be highly appreciated.

[liubog2008]

The first WARN is missing validation layer of vulkan. Just install the SDK of vulkan.

In archlinux, vulkan-devel is what you need.

[hannobraun]

That indeed worked, thank you @liubog2008!

Together with the changes in #397, that fixes all warnings on my machine. Closing.