Cannot copy from depth texture to depth texture array even if entire texture is copied

[EriKWDev]

Description
When I'm calling encoder.copy_texture_to_texture from a depth texture to a texture2darray of depth texture I get validation error:

wgpu error: Validation Error

Caused by:
    In CommandEncoder::copy_texture_to_texture
    Copy error
    The entire texture must be copied when copying from depth texture

even though the entire depth texture is being copied.

I happen to have differing sample_counts when I discovered this, but further testing keeps giving me the same error even if the textures have the same sample_count.

let multisampled_depth_texture = device.create_texture(&TextureDescriptor {
    label: None,
    size: Extent3d {
        width: 512,
        height: 512,
        depth_or_array_layers: 1,
    },
    mip_level_count: 1,
    sample_count: 4, // NOTE: Sample count > 1
    dimension: TextureDimension::D2,
    format: TextureFormat::Depth24Plus,
    usage: TextureUsages::TEXTURE_BINDING
        | TextureUsages::RENDER_ATTACHMENT
        | TextureUsages::COPY_SRC,
    view_formats: &[TextureFormat::Depth24Plus],
});


let non_multisampled_depth_2d_array = device.create_texture(&TextureDescriptor {
      label: None,
      size: Extent3d {
          width: 512,
          height: 512,
          depth_or_array_layers: 10,
      },
      mip_level_count: 1,
      sample_count: 1, // NOTE: This array has sample_count = 1
      dimension: TextureDimension::D2,
      format: TextureFormat::Depth24Plus,
      usage: TextureUsages::TEXTURE_BINDING
          | TextureUsages::RENDER_ATTACHMENT
          | TextureUsages::COPY_DST,
      view_formats: &[TextureFormat::Depth24Plus],
  });

// .. LATER ..
encoder.copy_texture_to_texture(
    multisampled_depth_texture.as_image_copy(),
    ImageCopyTexture {
        texture: &non_multisampled_depth_2d_array,
        mip_level: 0,
        origin: Origin3d {
            x: 0,
            y: 0,
            z: array_index,
        },
        aspect: TextureAspect::All,
    },
    Extent3d {
        width: multisampled_depth_texture.width(),
        height: multisampled_depth_texture.height(),
        depth_or_array_layers: 1,
    },
);

Expected vs observed behavior
I would like to copy a depth texture with sample_count > 1 into the texture2d array of depth textures with sample_count = 1

I don't know whether this is an issue in the reported error, the validator or whether this is not permitted by the spec.

Platform

Os: Linux 6.1.0-20, Debian 12 bookworm
Backend: Vulkan
wgpu: 0.19.4
rust: 1.78
CPU: AMD Ryzen 7 1700X (16) @ 3.400GHz
GPU: AMD ATI Radeon RX 6600/6600 XT/6600M

[EriKWDev]

Update: Multisampled or not has no effect, still same issue if both textures have multisample_count: 1

[teoxoy]

Note that sample_count must match but 2d <-> 2d_array copies should work.

@EriKWDev could you give #5705 a try?

[EriKWDev]

Sadly our application is blocked by this issue #5693 on latest version so cannot verify immediately in our app, but your fix seems relevant.

[EriKWDev]

After merging #5681 and your #5705 into a fork of wgpu, I can confirm that I can now copy the depth textures successfully in our application :)